WorldWideScience

Sample records for pumped storage

  1. Underground pumped hydroelectric storage

    Science.gov (United States)

    Allen, R. D.; Doherty, T. J.; Kannberg, L. D.

    1984-07-01

    Underground pumped hydroelectric energy storage was conceived as a modification of surface pumped storage to eliminate dependence upon fortuitous topography, provide higher hydraulic heads, and reduce environmental concerns. A UPHS plant offers substantial savings in investment cost over coal-fired cycling plants and savings in system production costs over gas turbines. Potential location near load centers lowers transmission costs and line losses. Environmental impact is less than that for a coal-fired cycling plant. The inherent benefits include those of all pumped storage (i.e., rapid load response, emergency capacity, improvement in efficiency as pumps improve, and capacity for voltage regulation). A UPHS plant would be powered by either a coal-fired or nuclear baseload plant. The economic capacity of a UPHS plant would be in the range of 1000 to 3000 MW. This storage level is compatible with the load-velocity requirements of a greater metropolitan area with population of 1 million or more.

  2. Pumped Storage and Potential Hydropower from Conduits

    Energy Technology Data Exchange (ETDEWEB)

    none,

    2015-02-25

    Th is Congressional Report, Pumped Storage Hydropower and Potential Hydropower from Conduits, addresses the technical flexibility that existing pumped storage facilities can provide to support intermittent renewable energy generation. This study considered potential upgrades or retrofit of these facilities, the technical potential of existing and new pumped storage facilities to provide grid reliability benefits, and the range of conduit hydropower opportunities available in the United States.

  3. Pumped storage plants. Status and perspectives

    Energy Technology Data Exchange (ETDEWEB)

    Vennemann, Peter [RWE Power AG, Essen (Germany). Dept. for Electrical and Mechanical Engineering; Gruber, Karl Heinz; Kunsch, Andreas [VERBUND Hydro Power AG, Vienna (Austria); Haaheim, Jon Ulrik [Statkraft Energi AS, Oslo (Norway); Sistenich, Hans-Peter; Thoeni, Hans-Rudolf

    2011-07-01

    Pumped storage plants (PSP) enable the storage of energy with rated capacities of order of GW at a single site. Reservoirs allow charging and discharging times of at least hours, sometimes days or even up to several weeks. Short ramp-up times permit the participation in the secondary reserve market as a standing reserve. For bulk energy storage, PSP reach the lowest, specific costs. In the EU27 countries, Norway and Switzerland, a total of 44 GW of pumped storage capacity is installed. The utilisation of PSP strongly correlates with the amount of conventional generation capacity, rather than with topographical options. (orig.)

  4. A comparison of pump storage technologies; Pumpspeichertechnologien im Vergleich

    Energy Technology Data Exchange (ETDEWEB)

    Albrecht, Joerg-Peter [Voith Hydro GmbH und Co. KG, Heidenheim (Germany)

    2012-07-01

    According to the current state of art pumped storage power plants are the only reliable, economically viable and ecologically sound storage option for electric power. The different technical solutions, the best possible applications and latest research results for pumped storage power plants are presented in this paper. There are numerous potentia Is for the construction of pumped storage power stations worldwide. In Europe, where this technology to generate electricity from hydro power is used for a long time, new sites exist primarily with special technical requirements. Existing pumped storage power plants are up for modernization, to increase power and partly for expansion. The need for reliable electricity storage through pumped storage power plants is high. The willingness to invest in expansion however has, because of the economic conditions, the low difference in price between base load and peak load supply, deteriorated significantly in the meantime. (orig.)

  5. Overall control and monitoring systems for pumped storage plants

    Energy Technology Data Exchange (ETDEWEB)

    Stepinski, B.; Cvetko, H.

    1982-01-01

    Experience and technical innovations in power plant engineering have resulted in continuous improvements of operation control, availability and safety of pumped storage plants. Process control is constantly improved as new developments are made in equipment and systems engineering. Plant control concepts with increasingly complex automation hierarchy are described by which pumped storage processes can be controlled optimally, reliably, and automatically.

  6. Determination of storage coefficients during pumping and recovery.

    Science.gov (United States)

    Ashjari, Javad

    2013-01-01

    An aquifer test is used mostly to determine the storage coefficient and transmissivity. Although residual drawdown data are widely used in estimating the transmissivity of aquifers, the estimation of storage coefficients with recovery data is controversial. Some researchers have proposed methods to estimate storage coefficients with recovery data by assuming equality of storage coefficients for the recovery and pumping periods (S = S'). The aim of this study is to determine storage coefficients without such an assumption, that is, S≠S'. The method is a modified version of Banton-Bangoy's method without considering drawdown data due to pumping. Drawdown is plotted vs. the logarithmic ratio (t'/t) or time since pumping stopped to the duration of pumping and the ratio of storage coefficient during recovery to the storage coefficient from the pumping period (S'/S). The method is verified with one case study and two synthetic examples. Thus, it is possible to determine storage coefficient of pumping period accurately without any data from pumping period by recovery data.

  7. Overall control and monitoring systems for pumped storage plants

    Energy Technology Data Exchange (ETDEWEB)

    Stepinski, B.; Cvetko, H.

    1982-06-01

    The article describes control and monitoring concepts in which the delegation of responsibility is becoming more decisive than ever (automation hierarchy), and which are capable of optimized, automatic control of process events in pumped storage plants. 8 refs.

  8. Entropy, pricing and productivity of pumped-storage

    Science.gov (United States)

    Karakatsanis, Georgios; Tyralis, Hristos; Tzouka, Katerina

    2016-04-01

    Pumped-storage constitutes today a mature method of bulk electricity storage in the form of hydropower. This bulk electricity storability upgrades the economic value of hydropower as it may mitigate -or even neutralize- stochastic effects deriving from various geophysical and socioeconomic factors, which produce numerous load balance inefficiencies due to increased uncertainty. Pumped-storage further holds a key role for unifying intermittent renewable (i.e. wind, solar) units with controllable non-renewable (i.e. nuclear, coal) fuel electricity generation plants into integrated energy systems. We develop a set of indicators for the measurement of performance of pumped-storage, in terms of the latter's energy and financial contribution to the energy system. More specifically, we use the concept of entropy in order to examine: (1) the statistical features -and correlations- of the energy system's intermittent components and (2) the statistical features of electricity demand prediction deviations. In this way, the macroeconomics of pumped-storage emerges naturally from its statistical features (Karakatsanis et al. 2014). In addition, these findings are combined to actual daily loads. Hence, not only the amount of energy harvested from the pumped-storage component is expected to be important, but the harvesting time as well, as the intraday price of electricity varies significantly. Additionally, the structure of the pumped-storage market proves to be a significant factor as well for the system's energy and financial performance (Paine et al. 2014). According to the above, we aim at postulating a set of general rules on the productivity of pumped-storage for (integrated) energy systems. Keywords: pumped-storage, storability, economic value of hydropower, stochastic effects, uncertainty, energy systems, entropy, intraday electricity price, productivity References 1. Karakatsanis, Georgios et al. (2014), Entropy, pricing and macroeconomics of pumped-storage systems

  9. Entropy, pricing and macroeconomics of pumped-storage systems

    Science.gov (United States)

    Karakatsanis, Georgios; Mamassis, Nikos; Koutsoyiannis, Demetris; Efstratiadis, Andreas

    2014-05-01

    We propose a pricing scheme for the enhancement of macroeconomic performance of pumped-storage systems, based on the statistical properties of both geophysical and economic variables. The main argument consists in the need of a context of economic values concerning the hub energy resource; defined as the resource that comprises the reference energy currency for all involved renewable energy sources (RES) and discounts all related uncertainty. In the case of pumped-storage systems the hub resource is the reservoir's water, as a benchmark for all connected intermittent RES. The uncertainty of all involved natural and economic processes is statistically quantifiable by entropy. It is the relation between the entropies of all involved RES that shapes the macroeconomic state of the integrated pumped-storage system. Consequently, there must be consideration on the entropy of wind, solar and precipitation patterns, as well as on the entropy of economic processes -such as demand preferences on either current energy use or storage for future availability. For pumped-storage macroeconomics, a price on the reservoir's capacity scarcity should also be imposed in order to shape a pricing field with upper and lower limits for the long-term stability of the pricing range and positive net energy benefits, which is the primary issue of the generalized deployment of pumped-storage technology. Keywords: Entropy, uncertainty, pricing, hub energy resource, RES, energy storage, capacity scarcity, macroeconomics

  10. PUMPED STORAGE ENVIRONMENTAL EFFECTS: ASSESSMENT OF RESEARCH NEEDS

    Energy Technology Data Exchange (ETDEWEB)

    DH. Fickeisen

    1979-09-01

    Pumped storage hydroelectric systems convert large quantities of electrical energy to a form that may be stored and efficiently reconverted to electricity. Water is pumped from a lower reservoir to an upper reservoir during periods of low power demand. The stored water is then used to generate additional power when demand peaks. Since the basic requirements of the system are simple, the design of individual plants and their locations vary widely. These variations make assessment of the generic environmental impact of the pumped storage systems difficult. In addition, most studies have not examined the impacts of an operating plant comprehensively. Assessment of the environmental effects of development and operation of a pumped storage plant requires an extensive set of baseline information, which is deficient in several aspects at the present state of the art. Additional research is needed to: • identify species groups likely to survive and reproduce in pumped storage reservoirs, their relationships and habitat preferences, and the basis for their production; • characterize anticipated reservoir ecosystem community development and relate it to physical characteristics of pumped storage reservoirs; • define effects of plant design and operating parameters on transport of organisms through the pump/turbine facility, accounting for behavior of the organisms potentially impacted; • access the mortality rate of organisms likely to pass through pump-turbines; • identify the relative advantages and disadvantages of screening intake structures to prevent passage of large organisms through the plant; • assess the effects of currents and water withdrawal on migration and movement of aquatic species; • investigate the effects of fluctuating water levels on the littoral zone and riparian communities, effects of stranding on entrapment of fishes, and effects on fish spawning; and • review the applicability of water quality and ecosystem models to pumped storage

  11. How to Avoid Severe Incidents at Pumped Storage Power Plants

    Science.gov (United States)

    Yasuda, Masashi; Watanabe, Satoshi

    2016-11-01

    Pumped storage is now increasing its importance as the most powerful and reliable tool for stabilizing the electrical network, especially under the increase of intermittent power sources like wind-power and solar-power. However, pumped storage power plants have generally more machinery troubles than the conventional hydropower plants and sometimes they encountered unexpected severe incidents having long-term outage and a considerable restoration cost. The present paper provides some study results about general tendencies of machinery troubles in pumped storage, some examples of severe incidents mainly about the electro-mechanical troubles but also about the flood and fire, and possible scenarios which may lead into a severe result. Finally, it provides lessons learned and some recommendations to avoid severe incidents based on experiences.

  12. Pumped storage power stations. Overview of new projects in Austria

    Energy Technology Data Exchange (ETDEWEB)

    Berger, G. [KELAG-Kaerntner Elektrizitaets-Aktiengesellschaft, Klagenfurt (Austria). Production Div.; Puerer, E. [Vorarlberger Illwerke AG, Schruns (Austria). Engineering Div.

    2008-07-01

    New framework conditions, due to the liberalisation of the electricity market and the development of renewable energy, especially wind energy with its stochastic production, led to a renaissance of pump storage technology in central Europe. Austria is lucky, first of all in providing natural water resources as well as in topography highly suitable for hydro power plants. Pump storage power plants represent even today an essential asset of the Austrian energy production. A boom for the planning and the construction of new power plants can be also observed. Currently there are pump storage power plants with a total capacity of approximately 1.100 MW under construction as well as others of approximately 1.200 MW in the stage of concrete planning. (orig.)

  13. Report on technical feasibility of underground pumped hydroelectric storage

    Science.gov (United States)

    Doherty, T. J.

    1982-03-01

    The technical and economic aspects of constructing a very high head underground hydroelectric pumped storage were examined at a prefeasibility level. Excavation of existing caverns in the West Rutland Vermont marble quarry would be used to construct the underground space. A plant capacity of 1200 MW and 12 h of continuous capacity were chosen as plant operating conditions. The site geology, plant design, and electrical and mechanical equipment required were considered. It was concluded that the cost of the 1200 MW underground pumped storage hydro electric project at this site, even with the proposed savings from marketable material, amount to between $581 and $595 per kilowatt of installed capacity on a January 1982 pricing level. It was concluded that the West Rutland underground pumped storage facility is uneconomic at this time.

  14. Reconciling Groundwater Storage Depletion Due to Pumping with Sustainability

    Directory of Open Access Journals (Sweden)

    Annukka Lipponen

    2010-11-01

    Full Text Available Groundwater pumping causes depletion of groundwater storage. The rate of depletion incurred by any new well is gradually decreasing and eventually becomes zero in the long run, after induced recharge and reduction of natural discharge of groundwater combined (capture have become large enough to balance the pumping rate completely. If aquifer-wide aggregated pumping rates are comparatively large, then such a new dynamic equilibrium may not be reached and groundwater storage may become exhausted. Decisions to pump groundwater are motivated by people’s need for domestic water and by expected benefits of using water for a variety of activities. But how much finally is abstracted from an aquifer (or is considered to be an optimal aggregate abstraction rate depends on a wide range of other factors as well. Among these, the constraint imposed by the groundwater balance (preventing aquifer exhaustion has received ample attention in the professional literature. However, other constraints or considerations related to changes in groundwater level due to pumping are observed as well and in many cases they even may dominate the decisions on pumping. This paper reviews such constraints or considerations, examines how they are or may be incorporated in the decision-making process, and evaluates to what extent the resulting pumping rates and patterns create conditions that comply with principles of sustainability.

  15. Sorption pumps and storage for gases

    Science.gov (United States)

    Haaland, Peter; Bethel, Dylan

    2016-08-16

    A method and system for filling gas storage vessels from a source operates by cooling a sorbent, opening a valve to transfer gas by physisorption, regulating the sorbent temperature to achieve the desired degree of filling, closing the valve connecting to the gas source, and warming the tank, sorbent, and gas to provide a predetermined pressure at room temperature.

  16. Short term pumped storage scheduling using two proposed techniques

    Directory of Open Access Journals (Sweden)

    M.M. Salama, M.M. Elgazar, S.M. Abdelmaksoud, H.A. Henry

    2014-01-01

    Full Text Available In this paper, a genetic algorithm and constriction factor based particle swarm optimization technique are proposed for solving the short term pumped storage hydro thermal scheduling problem. The performance efficiency of the proposed techniques is demonstrated on hydrothermal test system comprising of five thermal units and one pumped storage power plant. A wide rang of thermal and hydraulic constraints are taken into consideration such as real power balance constraint, minimum and maximum limits of thermal units and pumped storage power plant, water discharge and water pumping rate limits and reservoir storage volume constraints. The simulation results obtained from the constriction factor based particle swarm optimization technique are compared with the outcomes obtained from the genetic algorithm in terms of cost saving and execution time to reveal the validity and verify the feasibility of the proposed methods. The test results show that the constriction factor based particle swarm optimization technique performs better than genetic algorithm in solving this problem in terms of cost saving and computational time.

  17. Maximizing Storage Flexibility in an Aggregated Heat Pump Portfolio

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Nielsen, Kirsten M.; Andersen, Palle

    2014-01-01

    To balance the electrical grid due to a large increase in the renewable energy production mainly from wind turbines will be a problem in the near future in Denmark. Smart grid solutions with new storage capacities are essential. In this work single family houses with heat pumps are investigated...

  18. Efficiency improvement for wind energy pumped storage systems

    DEFF Research Database (Denmark)

    Forcos, A.; Marinescu, C.; Teodorescu, Remus

    2011-01-01

    Integrating wind energy into the grid may raise stability problems. Solutions for avoiding these situations are studied and energy storage methods are suitable for balancing the energy between the wind turbine and grid. In this paper, an autonomous wind turbine pumped storage system is presented....... The focus of this paper is to improve the efficiency of this system, which is small at low power levels. The driving motorpump group of the storage system is the key point presented in this paper for efficiency improving. Two control methods, experimentally implemented for induction machine are presented...

  19. 78 FR 26358 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2013-05-06

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy...), on the Eagle Mountain Pumped Storage Hydroelectric Project. e. All local, state, and federal...

  20. 76 FR 22393 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Cancellation...

    Science.gov (United States)

    2011-04-21

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... and Wildlife Service for the proposed Eagle Mountain Pumped Storage Hydroelectric Project....

  1. 77 FR 47628 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Meeting...

    Science.gov (United States)

    2012-08-09

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Management Act and the Federal Power Act), on the Eagle Mountain Pumped Storage Hydroelectric...

  2. New simulation model of absorption pump with internal storage

    Energy Technology Data Exchange (ETDEWEB)

    San Juan, Cristina; Soutullo, Silvia; Enriquez, Ricardo; Ferrer, Jose Antonio; Heras, M Rosario [Energy Efficiency in Buildings R and D Unit. CIEMAT., Avenida Complutense 22, 28040 Madrid, (Spain)], email: cristina.sanjuan@ciemat.es

    2010-07-01

    In hot climates, such as in Spain, conditioning systems are used to provide a good level of thermal comfort during summer. Systems are usually composed of one liquid absorption pump and external storage in a water tank. The aim of this study is to present a new technology whereby energy is stored in crystallized salts through the use of 4 heat pumps. A case study was carried out in the Plataforma Solar de Almeria, Spain, where the performance of both conventional and new cooling systems were analyzed through the use of a dynamic model in TRNSYS. Results showed that for the new system, adaptability increases with the number of independent blocks and its performance is influenced by the control strategy. In addition it was found that 15m3 of external storage are required in conventional systems to achieve the same performance as the new system. This study showed that the new system requires less storage room than conventional systems.

  3. Large eddy simulation of a pumped- storage reservoir

    Science.gov (United States)

    Launay, Marina; Leite Ribeiro, Marcelo; Roman, Federico; Armenio, Vincenzo

    2016-04-01

    The last decades have seen an increasing number of pumped-storage hydropower projects all over the world. Pumped-storage schemes move water between two reservoirs located at different elevations to store energy and to generate electricity following the electricity demand. Thus the reservoirs can be subject to important water level variations occurring at the daily scale. These new cycles leads to changes in the hydraulic behaviour of the reservoirs. Sediment dynamics and sediment budgets are modified, sometimes inducing problems of erosion and deposition within the reservoirs. With the development of computer performances, the use of numerical techniques has become popular for the study of environmental processes. Among numerical techniques, Large Eddy Simulation (LES) has arisen as an alternative tool for problems characterized by complex physics and geometries. This work uses the LES-COAST Code, a LES model under development in the framework of the Seditrans Project, for the simulation of an Upper Alpine Reservoir of a pumped-storage scheme. Simulations consider the filling (pump mode) and emptying (turbine mode) of the reservoir. The hydraulic results give a better understanding of the processes occurring within the reservoir. They are considered for an assessment of the sediment transport processes and of their consequences.

  4. 76 FR 69720 - Don Pedro Hydro, LLC; Moccasin Pumped Storage, LLC; Notice of Competing Preliminary Permit...

    Science.gov (United States)

    2011-11-09

    ... the owners' express permission. DPH's proposed Don Pedro Pumped Storage Hydroelectric Project No...) and Moccasin Pumped Storage, LLC (Moccasin) filed ] preliminary permit applications, pursuant to.../91, Logan, UT 84321. (435) 752-2580. Moccasin's Moccasin Pumped Storage Project No. 14305-000 would...

  5. Modeling Pumped Thermal Energy Storage with Waste Heat Harvesting

    Science.gov (United States)

    Abarr, Miles L. Lindsey

    This work introduces a new concept for a utility scale combined energy storage and generation system. The proposed design utilizes a pumped thermal energy storage (PTES) system, which also utilizes waste heat leaving a natural gas peaker plant. This system creates a low cost utility-scale energy storage system by leveraging this dual-functionality. This dissertation first presents a review of previous work in PTES as well as the details of the proposed integrated bottoming and energy storage system. A time-domain system model was developed in Mathworks R2016a Simscape and Simulink software to analyze this system. Validation of both the fluid state model and the thermal energy storage model are provided. The experimental results showed the average error in cumulative fluid energy between simulation and measurement was +/- 0.3% per hour. Comparison to a Finite Element Analysis (FEA) model showed energy of a recently proposed Pumped Thermal Energy Storage and Bottoming System (Bot-PTES) that uses ammonia as the working fluid. This analysis focused on the effects of hot thermal storage utilization, system pressure, and evaporator/condenser size on the system performance. This work presents the estimated performance for a proposed baseline Bot-PTES. Results of this analysis showed that all selected parameters had significant effects on efficiency, with the evaporator/condenser size having the largest effect over the selected ranges. Results for the baseline case showed stand-alone energy storage efficiencies between 51 and 66% for varying power levels and charge states, and a stand-alone bottoming efficiency of 24%. The resulting efficiencies for this case were low compared to competing technologies; however, the dual-functionality of the Bot-PTES enables it to have higher capacity factor, leading to 91-197/MWh levelized cost of energy compared to 262-284/MWh for batteries and $172-254/MWh for Compressed Air Energy Storage.

  6. Entropy, pumped-storage and energy system finance

    Science.gov (United States)

    Karakatsanis, Georgios

    2015-04-01

    Pumped-storage holds a key role for integrating renewable energy units with non-renewable fuel plants into large-scale energy systems of electricity output. An emerging issue is the development of financial engineering models with physical basis to systematically fund energy system efficiency improvements across its operation. A fundamental physically-based economic concept is the Scarcity Rent; which concerns the pricing of a natural resource's scarcity. Specifically, the scarcity rent comprises a fraction of a depleting resource's full price and accumulates to fund its more efficient future use. In an integrated energy system, scarcity rents derive from various resources and can be deposited to a pooled fund to finance the energy system's overall efficiency increase; allowing it to benefit from economies of scale. With pumped-storage incorporated to the system, water upgrades to a hub resource, in which the scarcity rents of all connected energy sources are denominated to. However, as available water for electricity generation or storage is also limited, a scarcity rent upon it is also imposed. It is suggested that scarcity rent generation is reducible to three (3) main factors, incorporating uncertainty: (1) water's natural renewability, (2) the energy system's intermittent components and (3) base-load prediction deviations from actual loads. For that purpose, the concept of entropy is used in order to measure the energy system's overall uncertainty; hence pumped-storage intensity requirements and generated water scarcity rents. Keywords: pumped-storage, integration, energy systems, financial engineering, physical basis, Scarcity Rent, pooled fund, economies of scale, hub resource, uncertainty, entropy Acknowledgement: This research was funded by the Greek General Secretariat for Research and Technology through the research project Combined REnewable Systems for Sustainable ENergy DevelOpment (CRESSENDO; grant number 5145)

  7. Advanced Pumped Storage Hydropower and Ancillary Services Provision

    Energy Technology Data Exchange (ETDEWEB)

    Muljadi, Eduard; Gevorgian, Vahan; Mohanpurkar, Manish; Luo, Yusheng; Hovsapian, Rob; Koritarov, Vladimir

    2017-07-12

    This paper presents a high-level overview of the capability of advanced pumped storage hydropower to provide ancillary services including frequency regulation and oscillation damping. Type 3 and Type 4 generators are discussed. The examples given are for a small power system that uses a diesel generator as the main generator and a very large system that uses a gas turbine as the main generator.

  8. Improving the Energy Efficiency of Pumped-Storage Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Artyukh, S. F., E-mail: artjuch@mail.ru [Kharkov Polytechnic Institute (Ukraine); Galat, V. V. [JSC “UkrHydroEnergo” (Ukraine); Kuz’min, V. V. [JSC “Interregional Electricity Association ELTA” (Ukraine); Chervonenko, I. I. [Kharkov Polytechnic Institute (Ukraine); Shakaryan, Yu. G.; Sokur, P. V. [JSC “R& D Center at Federal Grid Company of Unified Energy System” (Russian Federation)

    2015-01-15

    Possible ways to improve the energy efficiency of hydroelectric generating sets of pumped-storage power plants (PSPPs) are studied. The Kiev PSPP is used as an example to show how its generating sets can be upgraded. It is concluded based on studies conducted that synchronous motor-generators should be replaced with asynchronized motor-generators. The feasibility of changing over the turbine to variable-speed operation is shown.

  9. Role of Pumped Storage Hydro Resources in Electricity Markets and System Operation: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Ela, E.; Kirby, B.; Botterud, A.; Milostan, C.; Krad, I.; Koritarov, V.

    2013-05-01

    The most common form of utility- sized energy storage system is the pumped storage hydro system. Originally, these types of storage systems were economically viable simply because they displace more expensive generating units. However, over time, as those expensive units became more efficient and costs declined, pumped hydro storage units no longer have the operational edge. As a result, in the current electricity market environment, pumped storage hydro plants are struggling. To offset this phenomenon, certain market modifications should be addressed. This paper will introduce some of the challenges faced by pumped storage hydro plants in today's markets and purpose some solutions to those problems.

  10. A Novel Pumped Hydro Combined with Compressed Air Energy Storage System

    OpenAIRE

    Erren Yao; Xinbing Wang; Liqin Wang; Huanran Wang

    2013-01-01

    A novel pumped hydro combined with compressed air energy storage (PHCA) system is proposed in this paper to resolve the problems of bulk energy storage in the wind power generation industry over an area in China, which is characterised by drought and water shortages. Thermodynamic analysis of the energy storage system, which focuses on the pre-set pressure, storage volume capacity, water air volume ratio, pump performance, and water turbine performance of the storage system, is also presented...

  11. Iowa Hill Pumped Storage Project Investigations - Final Technical Report

    Energy Technology Data Exchange (ETDEWEB)

    Hanson, David [Sacramento Municipal Unitlity District, Sacramento, CA (United States)

    2016-07-01

    This Final Technical Report is a summary of the activities and outcome of the Department of Energy (DOE) Assistance Agreement DE-EE0005414 with the Sacramento Municipal Utility District (SMUD). The Assistance Agreement was created in 2012 to support investigations into the Iowa Hill Pumped-storage Project (Project), a new development that would add an additional 400 MW of capacity to SMUD’s existing 688MW Upper American River Hydroelectric Project (UARP) in the Sierra Nevada mountains east of Sacramento, California.

  12. A new principle for underground pumped hydroelectric storage

    DEFF Research Database (Denmark)

    Olsen, Jan; Paasch, Kasper; Lassen, Benny

    2015-01-01

    cavity. The cavity is formed by two impermeable membranes welded along the edges. A simple model captures the dynamics of the system revealing the importance of both visco-elastic and plastic effects for the cyclic loading of the soil. The results indicate that the efficiency of this new concept...... will be very close to that of the traditional pumped hydro storage (PHS) technology and the energy lost by deformation of the soil will be between 0.04 and 0.12% for a full scale system of 30 MW power and 200 MWh capacity. A key feature of the concept is the relatively price efficient design where the main...

  13. 78 FR 25263 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2013-04-30

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Power Act), on the Eagle Mountain Pumped Storage Hydroelectric Project. e. All local, state, and...

  14. 77 FR 43280 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2012-07-24

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... Management Act and the Federal Power Act), on the Eagle Mountain Pumped Storage Hydroelectric Project. e....

  15. Energy storage - underground pumped storage / energy membrane; Energilager - nedgravet pumpelager / energimembran

    Energy Technology Data Exchange (ETDEWEB)

    Schroeder Pedersen, A. (Technical Univ. of Denmark, Risoe National Lab. for Sustainable Energy, Roskilde (Denmark)); Hededal, O.; Foged, N. (Danmarks Tekniske Univ., DTU Byg. Institut for Byggeri og Anlaeg, Kgs. Lyngby (Denmark)) (and others)

    2010-06-15

    The project deals with a new idea where water from a nearby reservoir - sea, river or lake - via a pump/motor pressurizes a closed underground membrane, meaning that excessive electrical energy is stored as mechanical energy. Afterwards the stored energy is released by the obtained pressure and the amount of water will impel a turbine/generator. Hereby an underground pressurized pump storage can be established. The advantage by such type of pump storage is, that it can be placed, where there is no natural geological formations - high placed lake or alike. The conclusion and results after the completion of Phase 1 and 2 is that the expected losses in the soil layers where the energy is stored as potential energy will be approx. 100J/m{sub 3}. It is expected that the energy loss in the soil layer on a 50x50 m demo installation (performed in Phase 3) would constitute <0.5% of the total energy stored. An elongation of less the <2% of the LDPE membrane was measured in the experiments. This is a lot less than the 7% elongation that the membrane was exposed to during the testing at Danfoss, and further far below elongation of 500% that the supplier indicates. There were no changes on the membrane after the test. (Author)

  16. A Novel Pumped Hydro Combined with Compressed Air Energy Storage System

    Directory of Open Access Journals (Sweden)

    Erren Yao

    2013-03-01

    Full Text Available A novel pumped hydro combined with compressed air energy storage (PHCA system is proposed in this paper to resolve the problems of bulk energy storage in the wind power generation industry over an area in China, which is characterised by drought and water shortages. Thermodynamic analysis of the energy storage system, which focuses on the pre-set pressure, storage volume capacity, water air volume ratio, pump performance, and water turbine performance of the storage system, is also presented. This paper discovers how such parameters affect the performance of the whole system. The ideal performance of this novel system has the following advantages: a simple, highly effective and low cost structure, which is comparable to the efficiency of a traditional pumped hydro storage system. Research results show a great solution to the current storage constraints encountered in the development of the wind power industry in China, which have been widely recognised as a bottleneck in the wind energy storage industry.

  17. Experimental analysis of a solar assisted absorption heat pump with earth seasonal storage

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behaviour of the various components and their interaction. The surveys were carried out over a two year period. The following operations were considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  18. 75 FR 78984 - South Run Pumped Storage, LLC; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2010-12-17

    ... Energy Regulatory Commission South Run Pumped Storage, LLC; Notice of Preliminary Permit Application..., 2010. On October 26, 2010, South Run Pumped Storage, LLC, Massachusetts, filed an application for a... feasibility of the South Run Pumped Storage Project (South Run Project or project) to be located on South...

  19. 76 FR 28025 - East Maui Pumped Storage Water Supply LCC; Notice of Preliminary Permit Application Accepted for...

    Science.gov (United States)

    2011-05-13

    ... Energy Regulatory Commission Project No. 14142-000 East Maui Pumped Storage Water Supply LCC; Notice of... Competing Applications On April 1, 2011, East Maui Pumped Storage Water Supply LCC filed an application for... the feasibility of the East Maui Pumped Storage Water Supply Project to be located on the Miliko...

  20. Study on the Construction Scale of Pumped-Storage Hydropower in Northeast Power Grid

    Institute of Scientific and Technical Information of China (English)

    Wang Nan; Bai Jianhua; Li You; Gu Xiaoguang; Li Chunshan

    2007-01-01

    @@ Peak regulation in the Northeast power grid is going from bad to worse. This stimulates the need to pumped-storage hydropower for its role in this respect. Based on the status of power sources and the load forecast in the system, the author puts forward a minimum construction scale of pumped-storage stations by the end of 2020 from technical feasibility, and an economic scale from economy. The analysis and comparison on the two schemes can be regarded as a reference for reasonably planning pumped-storage stations in the northeastern part of China.

  1. Wind power integration using individual heat pumps – Analysis of different heat storage options

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Mathiesen, Brian Vad; Lund, Henrik

    2012-01-01

    Significant installations of individual heat pumps are expected in future energy systems due to their economic competitiveness. This case study of the Danish energy system in 2020 with 50% wind power shows that individual heat pumps and heat storages can contribute to the integration of wind power...... reductions in excess electricity production and fuel consumption than heat accumulation tanks. Moreover, passive heat storage is found to be significantly more cost-effective than heat accumulation tanks. In terms of reducing fuel consumption of the energy system, the installation of heat pumps is the most...... important step. Adding heat storages only moderately reduces the fuel consumption. Model development has been made to facilitate a technical optimisation of individual heat pumps and heat storages in integration with the energy system....

  2. Commercial Impact and Optimum Capacity Determination of Pumped Storage Hydro Plant for a Practical Power System

    Science.gov (United States)

    Latha, P. G.; Anand, S. R.; Imthias, Ahamed T. P.; Sreejith, P. S., Dr.

    2013-06-01

    This paper attempts to study the commercial impact of pumped storage hydro plant on the operation of a stressed power system. The paper further attempts to compute the optimum capacity of the pumped storage scheme that can be provided on commercial basis for a practical power system. Unlike the analysis of commercial aspects of pumped storage scheme attempted in several papers, this paper is presented from the point of view of power system management of a practical system considering the impact of the scheme on the economic operation of the system. A realistic case study is presented as the many factors that influence the pumped storage operation vary widely from one system to another. The suitability of pumped storage for the particular generation mix of a system is well explored in the paper. To substantiate the economic impact of pumped storage on the system, the problem is formulated as a short-term hydrothermal scheduling problem involving power purchase which optimizes the quantum of power to be scheduled and the duration of operation. The optimization model is formulated using an algebraic modeling language, AMPL, which is then solved using the advanced MILP solver CPLEX.

  3. Pumped storage system model and experimental investigations on S-induced issues during transients

    Science.gov (United States)

    Zeng, Wei; Yang, Jiandong; Hu, Jinhong

    2017-06-01

    Because of the important role of pumped storage stations in the peak regulation and frequency control of a power grid, pump turbines must rapidly switch between different operating modes, such as fast startup and load rejection. However, pump turbines go through the unstable S region in these transition processes, threatening the security and stability of the pumped storage station. This issue has mainly been investigated through numerical simulations, while field experiments generally involve high risks and are difficult to perform. Therefore, in this work, the model test method was employed to study S-induced security and stability issues for a pumped storage station in transition processes. First, a pumped storage system model was set up, including the piping system, model units, electrical control systems and measurement system. In this model, two pump turbines with different S-shaped characteristics were installed to determine the influence of S-shaped characteristics on transition processes. The model platform can be applied to simulate any hydraulic transition process that occurs in real power stations, such as load rejection, startup, and grid connection. On the experimental platform, the S-shaped characteristic curves were measured to be the basis of other experiments. Runaway experiments were performed to verify the impact of the S-shaped characteristics on the pump turbine runaway stability. Full load rejection tests were performed to validate the effect of the S-shaped characteristics on the water-hammer pressure. The condition of one pump turbine rejecting its load after another defined as one-after-another (OAA) load rejection was performed to validate the possibility of S-induced extreme draft tube pressure. Load rejection experiments with different guide vane closing schemes were performed to determine a suitable scheme to adapt the S-shaped characteristics. Through these experiments, the threats existing in the station were verified, the

  4. 76 FR 10578 - Cuffs Run Pumped Storage, LLC; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2011-02-25

    ... Energy Regulatory Commission Cuffs Run Pumped Storage, LLC; Notice of Preliminary Permit Application... 18, 2010, Cuffs Run Pumped Storage, LLC filed an application for a preliminary permit, pursuant to section 4(f) of the Federal Power Act, proposing to study the feasibility of the Cuffs Run Pumped...

  5. Assessment of high-head turbomachinery for underground pumped hydroelectric storage plants

    Science.gov (United States)

    Tam, S. W.; Frigo, A. A.; Blomquist, C. A.

    Underground pumped hydroelectric storage (UPHS) plants equipped with advanced reversible pump turbines for operating heads from 500 to 1500 m are discussed in terms of cost efficiency. It is found that the use of advanced machinery shifts the minimum UPHS plant cost to the head range 1200-1500 m. The interactive effects of pump-turbine efficiencies and charge/discharge ratios are examined. It is shown that under certain conditions, a pump-turbine option with a higher charge-discharge ratio at the expense of somewhat lower operating efficiency may be desirable.

  6. Energy system investment model incorporating heat pumps with thermal storage in buildings and buffer tanks

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Balyk, Olexandr

    2013-01-01

    options: passive heat storage in the building structure via radiator heating, active heat storage in concrete floors via floor heating, and use of thermal storage tanks for space heating and hot water. It is shown that the model is well qualified for analysing possibilities and system benefits...... be taken into account. In this study, we present a model that facilitates analysing individual heat pumps and complementing heat storages in integration with the energy system, while optimising both investments and operation. The model incorporates thermal building dynamics and covers various heat storage...

  7. Research on the function orientation of pumped-storage plant in China

    Science.gov (United States)

    Feng, Jun-shu; Bo, Yuan; Wu, Sheng-yu; Zhang, Fu-qiang; Hao, Wei-hua

    2017-01-01

    With the growth of electrical load and development of clean energy, peak regulation of power system has been paid more attention to, in which case pumped-storage plant becomes the most efficient and economical way against peak load and the ensurance of safe and stable system operation. However, the dispatch and operation mode of pumped-storage plant is a little unreasonable at present in our country, due to the insufficient acknowledge of plants’ function orientation in different regions. This paper studied the standard of classifying pumped-storage plants, by dividing the plant function into three types security oriented, peak shaving oriented and renewable energy accommodation oriented, based on the local load characteristic, structure of power supply, accommodating capability of renewable energy, nuclear energy, etc. Finally, according to the current and future development situation of five Chinese regions, the function orientation partition of pumped-storage plant is given, which has profound guiding and practical significance for pumped-storage plant dispatch and operation.

  8. A novel technology for control of variable speed pumped storage power plant

    Institute of Scientific and Technical Information of China (English)

    Seyed Mohammad Hassan Hosseini; Mohammad Reza Semsar

    2016-01-01

    Variable speed pumped storage machines are used extensively in wind power plant and pumped storage power plant. This paper presents direct torque and flux control (DTFC) of a variable speed pumped storage power plant (VSPSP). By this method both torque and flux have been applied to control the VSPSP. The comparison between VSPSP’s control strategies is studied. At the first, a wind turbine with the capacity 2.2 kW and DTFC control strategies simulated then a 250 MW VSPSP is simulated with all of its parts (including electrical, mechanical, hydraulic and its control system) by MATLAB software. In all of simulations, both converters including two-level voltage source converter (2LVSC) and three-level voltage source converter (3LVSC) are applied. The results of applying 2LVSC and 3LVSC are the rapid dynamic responses with better efficiency, reducing the total harmonic distortion (THD) and ripple of rotor torque and flux.

  9. Research on Mechanism and Model of Centralized Bidding for Pumped Storage Power in Shanghai

    Science.gov (United States)

    Hua, Zhong; Ying, Zhiwei; Lv, Zhengyu; Jianlin, Yang; Huang, Yupeng; Li, Dong

    2017-05-01

    China is now in the transition stage toward power market and in some specific area, market approach has already been adopted to improve the overall efficiency. In this paper, Bidding and trading modes of pumped storage energy in various regions of China are analysed. Based on the constraints of bidding price and electricity, as well as the system power flow, the trading model is established to collect the capacity cost of pumped storage energy in Shanghai. With the trading model proposed, that the generators who actively undertake the capacity cost of pumped storage energy and bid enough electricity with lower price can be rewarded, while those attempts to conspire and manipulate the market will be penalized. Finally, using seven generators in Shanghai as examples to simulate the market operation, the effectiveness of the proposed model is verified.

  10. Operation ranges and dynamic capabilities of variable-speed pumped-storage hydropower

    Science.gov (United States)

    Mercier, Thomas; Olivier, Mathieu; Dejaeger, Emmanuel

    2017-04-01

    The development of renewable and intermittent power generation creates incentives for the development of both energy storage solutions and more flexible power generation assets. Pumped-storage hydropower (PSH) is the most established and mature energy storage technology, but recent developments in power electronics have created a renewed interest by providing PSH units with a variable-speed feature, thereby increasing their flexibility. This paper reviews technical considerations related to variable-speed PSH in link with the provision of primary frequency control, also referred to as frequency containment reserves (FCRs). Based on the detailed characteristics of a scale model pump-turbine, the variable-speed operation ranges in pump and turbine modes are precisely assessed and the implications for the provision of FCRs are highlighted. Modelling and control for power system studies are discussed, both for fixed- and variable-speed machines and simulation results are provided to illustrate the high dynamic capabilities of variable-speed PSH.

  11. Numerical investigation of the cavitational behaviour into a storage pump at off design operating points

    Energy Technology Data Exchange (ETDEWEB)

    Stuparu, A; Susan-Resiga, R; Anton, L E [Department of Hydraulic Machinery, Politehnica University of Timisoara, Bd. Mihai Viteazu 1, Timisoara, 300222 (Romania); Muntean, S, E-mail: astuparu@mh.mec.upt.r [Centre of Advanced Research in Engineering Science, Romanian Academy-Timisoara Branch, Bd. Mihai Viteazu 24, Timisoara, 300223 (Romania)

    2010-08-15

    The paper presents a new method for the analysis of the cavitational behaviour of hydraulic turbomachines. This new method allows determining the coefficient of the cavitation inception and the cavitation sensitivity of the turbomachines. We apply this method to study the cavitational behaviour of a large storage pump. By plotting in semi-logarithmic coordinates the vapour volume versus the cavitation coefficient, we show that all numerical data collapse in an exponential manner. This storage pump is located in a power plant and operating without the presence of the developed cavitation is vital. We investigate the behaviour of the pump from the cavitational point of view while the pump is operating for variable discharge. A distribution of the vapour volume upon the blade of the impeller is presented for all the four operating points. It can be seen how the volume of vapour evolves from one operating point to another. In order to study the influence of the cavitation phenomena upon the pump, the evolution of the pumping head against the cavitation coefficient is presented. That will show how the pumping head drops while the cavitation coefficient decreases. From analysing the data obtained from the numerical simulation it results that the cavitation phenomena is present for all the investigated operating points. By analysis of the slope of the curve describing the evolution of the vapour volume against the cavitation coefficient we determine the cavitation sensitivity of the pump for each operating point. It is showed that the cavitation sensitivity of the investigated storage pump increases while the flow rate decreases.

  12. A Novel Constant-Pressure Pumped Hydro Combined with Compressed Air Energy Storage System

    Directory of Open Access Journals (Sweden)

    Erren Yao

    2014-12-01

    Full Text Available As intermittent renewable energy is receiving increasing attention, the combination of intermittent renewable energy with large-scale energy storage technology is considered as an important technological approach for the wider application of wind power and solar energy. Pumped hydro combined with compressed air energy storage system (PHCA is one of the energy storage systems that not only integrates the advantages but also overcomes the disadvantages of compressed air energy storage (CAES systems and pumped hydro energy storage systems to solve the problem of energy storage in China’s arid regions. Aiming at the variable working conditions of PHCA system technology, this study proposes a new constant-pressure PHCA. The most significant characteristics of this system were that the water pump and hydroturbine work under stable conditions and this improves the working efficiency of the equipment without incurring an energy loss. In addition, the constant-pressure PHCA system was subjected to energy and exergy analysis, in expectation of exploring an attractive solution for the large-scale storage of existing intermittent renewable energy.

  13. A Simple Data Analysis Method for a Pumping Test with Skin and Wellbore Storage Effects

    Directory of Open Access Journals (Sweden)

    Chia-Shyun Chen and Chuan-Gui Lan

    2009-01-01

    Full Text Available In a pumping test conducted in a con fined aquifer in northern Taiwan, drawdown in the observation well was subject to wellbore storage of its own and the combined effect of wellbore storage and skin of the nearby pumping well. For such a complicated pumping test condition, the appropriate well hydraulics solutions are complicated in mathematics and involve five unknown a priori parameters; namely, the aquifer transmissivity, the aquifer storage coefficient, the skin factor of the pumping well, and the wellbore storage co efficients of the pumping and observation wells. The conventional trial-and-er ror procedure for a simul taneous determination of these five parameters is not easy to apply. Here, a simple data analysis method is de veloped, which takes advantage of the late-time characteristics of drawdown data and the late-time asymptotic behavior of the appropriate wellhy draulics solutions. As a re sult, some currently available graphic techniques are proven us ful for the determination of these parameters. Validity of this approach is verified by the excellent agree ment between the calculated drawdown using the appropriate well hydraulics solutions with the parameter estimates obtained from the field drawdown data.

  14. On the Profitability of Variable Speed Pump-Storage-Power in Frequency Restoration Reserve

    Science.gov (United States)

    Filipe, Jorge; Bessa, Ricardo; Moreira, Carlos; Silva, Bernardo

    2017-04-01

    The increase penetration of renewable energy sources (RES) into the European power system has introduced a significant amount of variability and uncertainty in the generation profiles raising the needs for ancillary services as well as other tools like demand response, improved generation forecasting techniques and changes to the market design. While RES is able to replace energy produced by the traditional centralized generation, it cannot displace its capacity in terms of ancillary services provided. Therefore, centralized generation capacity must be retained to perform this function leading to over-capacity issues and underutilisation of the assets. Large-scale reversible hydro power plants represent the majority of the storage solution installed in the power system. This technology comes with high investments costs, hence the constant search for methods to increase and diversify the sources of revenue. Traditional fixed speed pump storage units typically operate in the day-ahead market to perform price arbitrage and, in some specific cases, provide downward replacement reserve (RR). Variable speed pump storage can not only participate in RR but also contribute to FRR, given their ability to control its operating point in pumping mode. This work does an extended analysis of a complete bidding strategy for Pumped Storage Power, enhancing the economic advantages of variable speed pump units in comparison with fixed ones.

  15. 76 FR 30936 - West Maui Pumped Storage Water Supply, LLC; Notice of Preliminary Permit Application Accepted for...

    Science.gov (United States)

    2011-05-27

    ... Energy Regulatory Commission West Maui Pumped Storage Water Supply, LLC; Notice of Preliminary Permit... April 1, 2011, West Maui Pumped Storage Water Supply, LLC, filed an application for a preliminary permit... supply project effluent water to an existing irrigation system; (5) a powerhouse with two...

  16. Increasing wind energy penetration level using pumped hydro storage in island micro-grid system

    Energy Technology Data Exchange (ETDEWEB)

    Islam, Sheikh Mominul [Memorial Univ. of Newfoundland, St. John' s, NL (Canada). Dept. of Engineering

    2012-07-01

    Ramea is a small island in southern Newfoundland. Since 2004, it has a wind-diesel hybrid power system to provide power for approximately 600 inhabitants. In this paper, wind speed data, load data, and sizing of pumped hydro system at Ramea, Newfoundland are presented. The dynamic model of wind turbine, pumped hydro system, and diesel generator are included in this paper. The dynamic model is simulated in SIMULINK/MATLAB to determine the system voltage and frequency variation and also to visualize different power outputs. Sizing of pumped hydro system indicates that a 150-kW pumped hydro storage system can be installed in Ramea to increase the renewable energy fraction to 37% which will reduce non-renewable fuel consumption on this island. Also, it is found that a pumped hydro energy storage system for Ramea is a much better choice than a hydrogen energy storage system. Such a system will have a higher overall efficiency and could be maintained using local technical expertise, therefore, a more appropriate technology for Ramea. (orig.)

  17. A Feasibility Study of Solar Thermal Power Generation as the Pumping Power Source for Pumped Storage in Indonesia

    Science.gov (United States)

    Funatsu, Tetsuya; Natsume, Hiroaki

    A pumped storage hydroelectric generation (PSHG) has been studied as alternative peak power source of the oil-fired power generation in Indonesia. However, because there is no surplus base load electricity even in the night, the economic advantage can not be found. The possibility of solar thermal power generation (STPG) is investigated to restrain the increase of fuel consumption by the existing peak power source. The optimum system simulation and the analysis of economy and environmental impact by a multiobjective optimization method provide the following results. The optimum aperture area and thermal storage capacity of STPG are found by the simulation based on the climate and the solar condition in West Java. PSHG with STPG as the power source of storage pump shows lower generation cost and CO2 emission than PSHG with existing oil fired peak power sources. Even if the fuel switch from oil to gas is supposed in future, PSHG with STPG will achieve the lower generation cost and CO2 emission than PSHG with the oil/gas fired combined cycle by sharing the peak electricity supply with the oil/gas fired combined cycle in an appropriate ratio. Furthermore, if the crude oil price hike in future is considered, PSHG with STPG may be the optimal solution for the peak electricity supply of Java-Bari grid.

  18. 76 FR 15971 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Teleconference

    Science.gov (United States)

    2011-03-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Eagle Crest Energy as part of its on-going Section 7 Endangered Species Act consultation efforts. e....

  19. 76 FR 22699 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Teleconference

    Science.gov (United States)

    2011-04-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... Eagle Crest Energy as part of its on-going Section 7 Endangered Species Act consultation efforts. e....

  20. Analysis of the Storage Capacity in an Aggregated Heat Pump Portfolio

    DEFF Research Database (Denmark)

    Nielsen, Kirsten Mølgaard; Andersen, Palle; Pedersen, Tom Søndergård

    2015-01-01

    Energy storages connected to the power grid will be of great importance in the near future. A pilot project has investigated more than 100 single family houses with heat pumps all connected to the internet. The houses have large heat capacities and it is possible to move energy consumption...

  1. A predictive model for smart control of a domestic heat pump and thermal storage

    NARCIS (Netherlands)

    van Leeuwen, Richard Pieter; Gebhardt, I.; de Wit, J.B.; Smit, Gerardus Johannes Maria

    The purpose of this paper is to develop and validate a predictive model of a thermal storage which is charged by a heat pump and used for domestic hot water supply. The model is used for smart grid control purposes and requires measurement signals of flow and temperature at the inlet and outlet of

  2. Proceedings of the Clemson Workshop on Environmental Impacts of Pumped Storage Hydroelectric Operations

    Science.gov (United States)

    Clugston, J. P.

    1980-04-01

    The pumping of water to a high reservoir for storage during periods of low power demand, so that it can be used for the generation of electricity during peak power demand was discussed. Papers which were presented exchanged ideas and data with regard to the environmental impact of this regular interchange of water.

  3. A predictive model for smart control of a domestic heat pump and thermal storage

    NARCIS (Netherlands)

    Leeuwen, van R.P.; Gebhardt, I.; Wit, de J.B.; Smit, G.J.M.

    2016-01-01

    The purpose of this paper is to develop and validate a predictive model of a thermal storage which is charged by a heat pump and used for domestic hot water supply. The model is used for smart grid control purposes and requires measurement signals of flow and temperature at the inlet and outlet of t

  4. 30 CFR 57.4262 - Underground transformer stations, combustible liquid storage and dispensing areas, pump rooms...

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Underground transformer stations, combustible... and Control Firefighting Equipment § 57.4262 Underground transformer stations, combustible liquid storage and dispensing areas, pump rooms, compressor rooms, and hoist rooms. Transformer stations,...

  5. Computer simulation of ground coupled storage in a series solar assisted heat pump system

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, John W.; Metz, Philip D.

    1979-01-01

    A quantitative study of the effect of thermal coupling between the ground and the heat storage element of a series solar assisted heat pump system is presented. The transient simulation computer program TRNSYS is used to simulate the solar portion of this system. A program to simulate the thermal interaction of the storage element with the ground is incorporated into TRNSYS as a sub-routine. This program calculates heat flow through the ground in discrete steps over space and time. Boundary conditions are established. The ground coupled storage is driven by thermal inputs from the solar portion of the system and from the changing ambient and ground temperatures.

  6. Solar assisted absorption or motor driven heat pump with earth seasonal storage. Final report. Pt. 1 and 2

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1987-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been experimented. The purpose was to study the behaviour of the various components and their interaction. The surveys went on during two years. The following operations are considered: The charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  7. Simulation model of a variable-speed pumped-storage power plant in unstable operating conditions in pumping mode

    Science.gov (United States)

    Martínez-Lucas, G.; Pérez-Díaz, J. I.; Sarasúa, J. I.; Cavazzini, G.; Pavesi, G.; Ardizzon, G.

    2017-04-01

    This paper presents a dynamic simulation model of a laboratory-scale pumped-storage power plant (PSPP) operating in pumping mode with variable speed. The model considers the dynamic behavior of the conduits by means of an elastic water column approach, and synthetically generates both pressure and torque pulsations that reproduce the operation of the hydraulic machine in its instability region. The pressure and torque pulsations are generated each from a different set of sinusoidal functions. These functions were calibrated from the results of a CFD model, which was in turn validated from experimental data. Simulation model results match the numerical results of the CFD model with reasonable accuracy. The pump-turbine model (the functions used to generate pressure and torque pulsations inclusive) was up-scaled by hydraulic similarity according to the design parameters of a real PSPP and included in a dynamic simulation model of the said PSPP. Preliminary conclusions on the impact of unstable operation conditions on the penstock fatigue were obtained by means of a Monte Carlo simulation-based fatigue analysis.

  8. Wind power integration with heat pumps, heat storages, and electric vehicles - Energy systems analysis and modelling

    Energy Technology Data Exchange (ETDEWEB)

    Hedegaard, K.

    2013-09-15

    This PhD investigates to which extent heat pumps, heat storages, and electric vehicles can support the integration of wind power. Considering the gaps in existing research, the main focus is put on individual heat pumps in the residential sector (one-family houses) and the possibilities for flexible operation, using the heat storage options available. Several energy systems analyses are performed using the energy system models, Balmorel, developed at the former TSO, ElkraftSystem, and, EnergyPLAN, developed at Aalborg University. The Danish energy system towards 2030, with wind power penetrations of up to 60 %, is used as a case study in most of the analyses. Both models have been developed further, resulting in an improved representation of individual heat pumps and heat storages. An extensive model add-on for Balmorel renders it possible to optimise investment and operation of individual heat pumps and different types of heat storages, in integration with the energy system. Total costs of the energy system are minimised in the optimisation. The add-on incorporates thermal building dynamics and covers various different heat storage options: intelligent heat storage in the building structure for houses with radiator heating and floor heating, respectively, heat accumulation tanks on the space heating circuit, as well as hot water tanks. In EnergyPLAN, some of the heat storage options have been modelled in a technical optimisation that minimises fuel consumption of the energy system and utilises as much wind power as possible. The energy systems analyses reveal that in terms of supporting wind power integration, the installation of individual heat pumps is an important step, while adding heat storages to the heat pumps is less influential. When equipping the heat pumps with heat storages, only moderate system benefits can be gained. Hereof, the main system benefit is that the need for peak/reserve capacity investments can be reduced through peak load shaving; in

  9. Numerical and experimental study on heat pump water heater with PCM for thermal storage

    Energy Technology Data Exchange (ETDEWEB)

    Long, Jian-You; Zhu, Dong-Sheng [Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, Academy of Chemistry and Energy, South China University of Technology, Guangzhou, Guangdong 510640 (China)

    2008-07-01

    An air source heat pump water heater with phase change material (PCM) for thermal storage was designed to take advantage of off-peak electrical energy. The heat transfer model of PCM was based upon a pure conduction formulation. Quasi-steady state method was used to calculate the temperature distribution and phase front location of PCM during thermal storage process. Temperature and thermal resistance iteration approach has been developed for the analysis of temperature variation of heat transfer fluid (HTF) and phase front location of PCM during thermal release process. To test the physical validity of the calculational results, experimental studies about storing heat and releasing heat of PCM were carried. Comparison between the calculational results and the experimental data shows good agreement. Graphical results including system pressure and input power of heat pump, time-wise variation of stored and released thermal energy of PCM were presented and discussed. (author)

  10. Numerical Investigation of Stratified Thermal Storage Tank Applied in Adsorption Heat Pump Cycle

    OpenAIRE

    Taheri, Hadi

    2014-01-01

    With the aid of the TES (Thermal Energy Storage) in the adsorption heat pump cycle, the COP of the system can be improved. Different geometrical variations of the TES with stratification device, have been investigated numerically. Furthermore,The effective thermal conductivity has been analyzed. The simulation results of a reference CFD model have been compared with experimental results. Additionally, the porous medium impact on the mixing process and turbulence has been studied numerically.

  11. Mines as lower reservoir of an UPSH (Underground Pumping Storage Hydroelectricity): groundwater impacts and feasibility

    Science.gov (United States)

    Bodeux, Sarah; Pujades, Estanislao; Orban, Philippe; Dassargues, Alain

    2016-04-01

    The energy framework is currently characterized by an expanding use of renewable sources. However, their intermittence could not afford a stable production according to the energy demand. Pumped Storage Hydroelectricity (PSH) is an efficient possibility to store and release electricity according to the demand needs. Because of the topographic and environmental constraints of classical PSH, new potential suitable sites are rare in countries whose topography is weak or with a high population density. Nevertheless, an innovative alternative is to construct Underground Pumped Storage Hydroelectricity (UPSH) plants by using old underground mine works as lower reservoir. In that configuration, large amount of pumped or injected water in the underground cavities would impact the groundwater system. A representative UPSH facility is used to numerically determine the interactions with surrounding aquifers Different scenarios with varying parameters (hydrogeological and lower reservoir characteristics, boundaries conditions and pumping/injection time-sequence) are computed. Analysis of the computed piezometric heads around the reservoir allows assessing the magnitude of aquifer response and the required time to achieve a mean pseudo-steady state under cyclic solicitations. The efficiency of the plant is also evaluated taking the leakage into the cavity into account. Combining these two outcomes, some criterions are identified to assess the feasibility of this type of projects within potential old mine sites from a hydrogeological point of view.

  12. Water chemical evolution in Underground Pumped Storage Hydropower plants and induced consequences

    Science.gov (United States)

    Pujades, Estanislao; Orban, Philippe; Jurado, Anna; Ayora, Carlos; Brouyère, Serge; Dassargues, Alain

    2017-04-01

    Underground Pumped Storage Hydropower (UPSH) using abandoned mines is an alternative to manage the electricity production in flat regions. UPSH plants consist of two reservoirs; the upper reservoir is located at the surface or at shallow depth, while the lower reservoir is underground. These plants have potentially less constraints that the classical Pumped Storage Hydropower plants because more sites are available and impacts on landscape, land use, environment and society seem lower. Still, it is needed to consider the consequences of the groundwater exchanges occurring between the underground reservoir and surrounding porous media. Previous studies have been focused on the influence of these groundwater exchanges on the efficiency and on groundwater flow impacts. However, hydrochemical variations induced by the surface exposure of pumped water and their consequences have not been yet addressed. The objective of this work is to evaluate the hydrochemical evolution of the water in UPSH plants and its effects on the environment and on the UPSH efficiency. The problem is studied numerically by means of reactive transport modelling. Different scenarios are considered varying the chemical properties of the surrounding porous medium and groundwater. Results show that the dissolution and/or precipitation of some compounds may affect (1) the groundwater quality, and (2) the efficiency and the useful life of the used pumps and turbines of the UPSH system.

  13. Study on the Performance of a Ground Source Heat Pump System Assisted by Solar Thermal Storage

    Directory of Open Access Journals (Sweden)

    Yu Jin Nam

    2015-11-01

    Full Text Available A ground source heat pump system (GSHPS utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. However, continuous long-term operation will reduce the soil temperature in winter, resulting in a decline in system performance. In this research, in order to improve the system performance of a GSHPS, a ground heat pump system integrated with solar thermal storage was developed. This solar-assisted ground heat pump system (SAGHPS can both maintain the balance of the soil temperature effectively and achieve higher system performance than the conventional system. In this paper, in order to examine the characteristics of the system, a dynamic simulation was conducted under various conditions. The results of our case study provide specific operation data such as heat exchange rate, heat source temperature, and heat pump COP. As a result, the heat pump COP of SAGHPS was 4.7%, 9.3% higher than that of the GSHPS.

  14. Wind-driven stand-alone DFIG with battery and pumped hydro storage system

    Indian Academy of Sciences (India)

    K NAVIN SAM; N KUMARESAN; N AMMASAI GOUNDEN

    2017-02-01

    A wind-driven doubly fed induction generator (DFIG) along with the battery and pumped hydro storage plant (PHSP) has been devised for supplying isolated loads. PHSP-based storage system is economical and viable for the MW level wind-turbine system. The proposed scheme employs a squirrel-cage induction machine (SCIM) coupled with reversible pump turbine for PHSP. The battery storage is also included in this system to cope up with the intermittent nature of wind and fast-changing load. A simple control strategy has been implemented for maintaining the set values of voltage magnitude and frequency at the stator terminals of DFIG, which serve as a virtual grid for connecting ac loads and SCIM. Based on the availability of power in the wind, PHSP and battery, various operating modes of the proposed system have been clearly identified forsupplying the isolated loads. These operating modes are clearly demonstrated through the analysis developed for this purpose and validated through experimental results. The salient features of the proposed system over the existing stand-alone wind-driven generators are (i) structural simplicity, i.e., employing only one power electronic converter, (ii) wide speed operation of wind-driven DFIG, (iii) reduced battery capacity, (iv) high energy storage using PHSP and (v) availability of continuous power to the isolated loads.

  15. Relative Contribution of Monsoon Precipitation and Pumping to Changes in Groundwater Storage in India

    Science.gov (United States)

    Asoka, Akarsh; Gleeson, Tom; Wada, Yoshihide; Mishra, Vimal

    2017-01-01

    The depletion of groundwater resources threatens food and water security in India. However, the relative influence of groundwater pumping and climate variability on groundwater availability and storage remains unclear. Here we show from analyses of satellite and local well data spanning the past decade that long-term changes in monsoon precipitation are driving groundwater storage variability in most parts of India either directly by changing recharge or indirectly by changing abstraction. We find that groundwater storage has declined in northern India at the rate of 2 cm/yr and increased by 1 to 2 cm/yr in southern India between 2002 and 2013. We find that a large fraction of the total variability in groundwater storage in north-central and southern India can be explained by changes in precipitation. Groundwater storage variability in northwestern India can be explained predominantly by variability in abstraction for irrigation, which is in turn influenced by changes in precipitation. Declining precipitation in northern India is linked to Indian Ocean warming, suggesting a previously unrecognized teleconnection between ocean temperatures and groundwater storage.

  16. Relative Contribution of Monsoon Precipitation and Pumping to Changes in Groundwater Storage in India

    Science.gov (United States)

    Asoka, Akarsh; Gleeson, Tom; Wada, Yoshihide; Mishra, Vimal

    2017-01-01

    The depletion of groundwater resources threatens food and water security in India. However, the relative influence of groundwater pumping and climate variability on groundwater availability and storage remains unclear. Here we show from analyses of satellite and local well data spanning the past decade that long-term changes in monsoon precipitation are driving groundwater storage variability in most parts of India either directly by changing recharge or indirectly by changing abstraction. We find that groundwater storage has declined in northern India at the rate of 2 cm/yr and increased by 1 to 2 cm/yr in southern India between 2002 and 2013. We find that a large fraction of the total variability in groundwater storage in north-central and southern India can be explained by changes in precipitation. Groundwater storage variability in northwestern India can be explained predominantly by variability in abstraction for irrigation, which is in turn influenced by changes in precipitation. Declining precipitation in northern India is linked to Indian Ocean warming, suggesting a previously unrecognized teleconnection between ocean temperatures and groundwater storage.

  17. Energy performance and economic evaluation of heat pump/organic rankine cycle system with sensible thermal storage

    DEFF Research Database (Denmark)

    Carmo, Carolina; Dumont, Olivier; Nielsen, Mads Pagh

    2016-01-01

    -life conditions knowledge, the paper considers two different sensible energy storage (TES) configurations for the reversible heat pump/organic Rankine cycle (HP/ORC) system: a buffer tank for both space heating and domestic hot water and a hot water storage tank used exclusively for domestic hot water...... that consists of a ground-source heat pump with possibility of reversing operation as an ORC power cycle combined with solar heating in a single-family building is introduced. The ORC mode enables the use of solar energy in periods of no heat energy demand and reverses the heat pump cycle to supply electrical...

  18. The mechanism of photo-energy storage in the Halorhodopsin chloride pump.

    Science.gov (United States)

    Pfisterer, Christoph; Gruia, Andreea; Fischer, Stefan

    2009-05-15

    The light-driven pump Halorhodopsin (hR) uses the energy stored in an initial meta-stable state (K), in which the bound retinal chromophore has been photoisomerized from all-trans to 13-cis, to drive the translocation of one chloride anion across the membrane. Thus far it was unclear whether retinal twisting or charge separation between the positive Schiff base of the retinal and the chloride anion is the primary mechanism of energy storage. Here, combined quantum mechanical/molecular mechanical (QM/MM) simulations show that the energy is predominantly stored by charge separation. However, a large variability in retinal twisting is observed, thus reconciling the contradictory hypotheses for storage. Surprisingly, the energy stored in the K-state amounts to only one-fifth of the photon energy. We explain why the protein cannot store more: even though this would accelerate chloride pumping, raising the K-state also reduces the relative energy barriers against unproductive decay, in particular via the premature cis to trans back-isomerization. Indeed, the protein has maximized its storage so that the back-isomerization barriers are just high enough (> or =18 kcal/mol) to keep the decay rate (1/100 ms) slower than the remaining photocycle (1/20 ms). This need to stabilize the captured photon-energy until it can be used in subsequent steps is inherent to light-driven proteins.

  19. Preliminary Feasibility Study of a Hybrid Solar and Modular Pumped Storage Hydro System at Biosphere 2

    Energy Technology Data Exchange (ETDEWEB)

    Lansey, Kevin [Univ. of Arizona, Tucson, AZ (United States); Hortsman, Chris [Univ. of Arizona, Tucson, AZ (United States)

    2016-10-01

    In this study, the preliminary feasibility of a hybrid solar and modular pumped storage system designed for high energy independence at Biosphere 2 is assessed. The system consists of an array of solar PV panels that generate electricity during the day to power both Biosphere 2 and a pump that sends water through a pipe to a tank at a high elevation. When solar power is not available, the water is released back down the pipe towards a tank at a lower elevation, where it passes through a hydraulic water turbine to generate hydroelectricity to power Biosphere 2. The hybrid system is sized to generate and store enough energy to enable Biosphere 2 to operate without a grid interconnection on an average day.

  20. Solar assisted absorption or motor driven heat pump with earth seasonal storage: Part 2, Tables and figures: Final report

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1986-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behavior of the various components and their interaction. The surveys went on during two years. The following operations are considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage. This volume contains all the figures and tables for the report. 77 figs., 24 tabs.

  1. Feasibility study of a Green Power Plant. Final report. [Offshore pumped hydro storage

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-03-15

    This project is a technical evaluation and a feasibility study of a concept called the Green Power Plant (GPP), developed by Seahorn Energy Aps. The Green Power Plant is an offshore pumped hydro storage facility constructed from prefabricated elements and with integrated renewable energy production. Pumped hydro storage is a known technology with a proven roundtrip energy storage efficiency of 80%. The focus of the GPP project is on simplifying and industrializing the construction of the reservoir wall, thereby achieving a cost efficient solution. The reservoir structure is dependent on the site on which the reservoir is established, thus Kriegers Flak in the Baltic Sea has been chosen as basis for the technical evaluation. As soil conditions vary, the technical evaluations have been based on a general soil profile. A water depth of 25m has been chosen as basis for the evaluation. A reservoir with a diameter of 2 km has been evaluated as baseline scenario. Feasibility of the GPP was evaluated based on the cost and income estimates. For the baseline scenario an internal rate of return of 6.6% was found for a period of 35 years. A sensitivity analysis reveals internal rates of return over 35 years varying from 4.9% to 10.9%. Especially larger reservoir diameters increase profitability of the GPP. The results from this project will be utilized in raising funds for further development of the GPP concept. Seahorn Energy Aps aims at optimizing the wind turbine integration, the steel pile wall structure and the pump-turbine integration in a future project towards construction of a demonstration facility. (LN)

  2. Potential Coastal Pumped Hydroelectric Energy Storage Locations Identified using GIS-based Topographic Analysis

    Science.gov (United States)

    Parsons, R.; Barnhart, C. J.; Benson, S. M.

    2013-12-01

    Large-scale electrical energy storage could accommodate variable, weather dependent energy resources such as wind and solar. Pumped hydroelectric energy storage (PHS) and compressed energy storage area (CAES) have life cycle energy and financial costs that are an order of magnitude lower than conventional electrochemical storage technologies. However PHS and CAES storage technologies require specific geologic conditions. Conventional PHS requires an upper and lower reservoir separated by at least 100 m of head, but no more than 10 km in horizontal distance. Conventional PHS also impacts fresh water supplies, riparian ecosystems, and hydrologic environments. A PHS facility that uses the ocean as the lower reservoir benefits from a smaller footprint, minimal freshwater impact, and the potential to be located near off shore wind resources and population centers. Although technologically nascent, today one coastal PHS facility exists. The storage potential for coastal PHS is unknown. Can coastal PHS play a significant role in augmenting future power grids with a high faction of renewable energy supply? In this study we employ GIS-based topographic analysis to quantify the coastal PHS potential of several geographic locations, including California, Chile and Peru. We developed automated techniques that seek local topographic minima in 90 m spatial resolution shuttle radar topography mission (SRTM) digital elevation models (DEM) that satisfy the following criteria conducive to PHS: within 10 km from the sea; minimum elevation 150 m; maximum elevation 1000 m. Preliminary results suggest the global potential for coastal PHS could be very significant. For example, in northern Chile we have identified over 60 locations that satisfy the above criteria. Two of these locations could store over 10 million cubic meters of water or several GWh of energy. We plan to report a global database of candidate coastal PHS locations and to estimate their energy storage capacity.

  3. The First Israeli Hydro-Electric Pumped Storage Power Plant Gilboa PSPP

    Science.gov (United States)

    Maruzewski, P., Dr.; Sautereau, T.; Sapir, Y.; Barak, H.; Hénard, F.; Blaix, J.-C.

    2016-11-01

    The Israeli Public Utilities Authority, PUA, decided to increase the instantaneous power available on the grid by adding Pumped Storage Power Plants, PSPP, to the existing generation capacity. PSP Investments Ltd. is a private investor that decided to develop the Gilboa PSPP. Its capacity is 300MWe. The project performance has to comply with PUA regulation for PSPP, and with all relevant Israeli laws and IECo standards. This paper itemizes an overview of the Gilboa PSPP through short summaries of units’ components from design step to manufacturing processes.

  4. Project risk control of underground engineering geological disaster in pumped-storage power station

    Institute of Scientific and Technical Information of China (English)

    Luo Shaoji

    2014-01-01

    This paper introduced the construction of the pumped-storage power station (PSPS). In the excava- tion of underground power house, the principle of excavation in thin layer and support in time with real time monitoring are adopted. The excavation blasting parameters are adjusted timely. Through these, the excavation quality can be guaranteed, the surrounding rock can be prevented from being damaged and the deformation of power house side wall can be controlled. Five security defense lines have been adopted to solve anti-seepage and drainage in the major underground projects.

  5. Project risk control of underground engineering geological disaster in pumped-storage power station

    Institute of Scientific and Technical Information of China (English)

    Luo Shaoji

    2014-01-01

    This paper introduced the construction of the pumped-storage power station (PSPS). In the excava-tion of underground power house,the principle of excavation in thin layer and support in time with real time monitoring are adopted. The excavation blasting parameters are adjusted timely. Through these,the excavation quality can be guaranteed,the surrounding rock can be prevented from being damaged and the deformation of power house side wall can be controlled. Five security defense lines have been adopted to solve anti-seepage and drainage in the major underground projects.

  6. Contribution of variable-speed pump hydro storage for power system dynamic performance

    Science.gov (United States)

    Silva, B.; Moreira, C.

    2017-04-01

    This paper presents the study of variable-speed Pump Storage Powerplant (PSP) in the Portuguese power system. It evaluates the progressive integration in three major locations and compares the power system performance following a severe fault event with consequent disconnection of non-Fault Ride-through (FRT) compliant Wind Farms (WF). To achieve such objective, a frequency responsive model was developed in PSS/E and was further used to substitute existing fixed-speed PSP. The results allow identifying a clear enhancement on the power system performance by the presence of frequency responsive variable-speed PSP, especially for the scenario presented, with high level of renewables integration.

  7. Dynamic Modeling of Adjustable-Speed Pumped Storage Hydropower Plant: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Muljadi, E.; Singh, M.; Gevorgian, V.; Mohanpurkar, M.; Havsapian, R.; Koritarov, V.

    2015-04-06

    Hydropower is the largest producer of renewable energy in the U.S. More than 60% of the total renewable generation comes from hydropower. There is also approximately 22 GW of pumped storage hydropower (PSH). Conventional PSH uses a synchronous generator, and thus the rotational speed is constant at synchronous speed. This work details a hydrodynamic model and generator/power converter dynamic model. The optimization of the hydrodynamic model is executed by the hydro-turbine controller, and the electrical output real/reactive power is controlled by the power converter. All essential controllers to perform grid-interface functions and provide ancillary services are included in the model.

  8. Practical operation strategies for pumped hydroelectric energy storage (PHES) utilising electricity price arbitrage

    DEFF Research Database (Denmark)

    Connolly, David; Lund, Henrik; Finn, P.

    2011-01-01

    that almost all (not, vert, similar97%) of the profits can be obtained by a PHES facility when it is optimised using the 24Optimal strategy developed, which optimises the energy storage based on the day-ahead electricity prices. However, to maximise profits with the 24Optimal strategy, the day......In this paper, three practical operation strategies (24Optimal, 24Prognostic, and 24Hsitrocial) are compared to the optimum profit feasible for a PHES facility with a 360 MW pump, 300 MW turbine, and a 2 GWh storage utilising price arbitrage on 13 electricity spot markets. The results indicate......-ahead electricity prices must be the actual prices which the PHES facility is charged or the PHES operator must have very accurate price predictions. Otherwise, the predicted profit could be significantly reduced and even become a loss. Finally, using the 24Optimal strategy, the PHES profit can surpass the annual...

  9. Simultaneous transient operation of a high head hydro power plant and a storage pumping station in the same hydraulic scheme

    Science.gov (United States)

    Bucur, D. M.; Dunca, G.; Cervantes, M. J.; Cǎlinoiu, C.; Isbǎşoiu, E. C.

    2014-03-01

    This paper presents an on-site experimental analysis of a high head hydro power plant and a storage pumping station, in an interconnected complex hydraulic scheme during simultaneous transient operation. The investigated hydropower site has a unique structure as the pumping station discharges the water into the hydropower plant penstock. The operation regimes were chosen for critical scenarios such as sudden load rejections of the turbines as well as start-ups and stops with different combinations of the hydraulic turbines and pumps operation. Several parameters were simultaneously measured such as the pumped water discharge, the pressure at the inlet pump section, at the outlet of the pumps and at the vane house of the hydraulic power plant surge tank. The results showed the dependence of the turbines and the pumps operation. Simultaneous operation of the turbines and the pumps is possible in safe conditions, without endangering the machines or the structures. Furthermore, simultaneous operation of the pumping station together with the hydropower plant increases the overall hydraulic efficiency of the site since shortening the discharge circuit of the pumps.

  10. Stability analysis of the governor-turbine-hydraulic system of pumped storage plant during small load variation

    Science.gov (United States)

    Yu, X. D.; Zhang, J.; Chen, S.; Liu, J. C.

    2016-11-01

    Governor-turbine-hydraulic (GTH) system is complex because of strong couplings of hydraulic, mechanical and electrical system. This paper presents a convenient mathematical model of the GTH system of a pumped storage plant (PSP) during small load variation. By using state space method and eigenvalue method, the stability of the GTH system is analyzed and the stable regions of the system can be given as well, which would help to optimize system design or the turning of governors. The proposed method is used to analyze the stability of a practical pumped storage plant during small load variation, which is also simulated in time domain on the basis of characteristics method. The theoretical analysis is in good agreement with numerical simulations. Based on the proposed method, the effect of the system parameters and operating conditions on the stable regions is investigated. These results are useful for the design of the GTH system of pumped storage plants.

  11. Evaluation of advanced turbomachinery for underground pumped hydroelectric storage. Part 3. Multistage unregulated pump/turbines for operating heads of 1000 to 1500 m

    Energy Technology Data Exchange (ETDEWEB)

    Frigo, A.A.; Pistner, C.

    1980-08-01

    This is the final report in a series of three on studies of advanced hydraulic turbomachinery for underground pumped hydroelectric storage. All three reports address Francis-type, reversible pump/turbines. The first report covered single-stage regulated units; the second report covered two-stage regulated units; the present report covers multistage unregulated units. Multistage unregulated pump/turbines offer an economically attractive option for heads of 1000 to 1500 m. The feasibility of developing such machines for capacities up to 500 MW and operating heads up to 1500 m has been evaluated. Preliminary designs have been generated for six multistage pump/turbines. The designs are for nominal capacities of 350 and 500 MW and for operating heads of 1000, 1250, and 1500 m. Mechanical, hydraulic, and economic analyses indicate that these machines will behave according to the criteria used to design them and that they can be built at a reasonable cost with no unsolvable problems. Efficiencies of 85.8% and 88.5% in the generating and pumping modes, respectively, can be expected for the 500-MW, 1500-m unit. Performances of the other five machines are at least comparable, and usually better. Over a 1000 to 1500-m head range, specific $/kW costs of the pump/turbines in mid-1978 US dollars vary from 19.0 to 23.1 for the 500-MW machines, and from 21.0 to 24.1 for the 350-MW machines.

  12. Underfloor pumped storage power plants in facilities of coal mining; Unterflur-Pumpspeicherwerke in Anlagen des Steinkohlebergbaus

    Energy Technology Data Exchange (ETDEWEB)

    Perau, Eugen; Schreiber, Ulrich [Duisburg-Essen Univ., Essen (Germany). Fachgebiet Geotechnik; Niemann, Andre [Duisburg-Essen Univ., Essen (Germany). Inst. fuer Wasserbau und Wasserwirtschaft; Koch, Marco K. [Bochum Univ. (Germany)

    2012-11-01

    The energy policy turnaround involves a variety of urgent issues. To date, the production of energy is dominated by conventional power plants. Previously the renewable energy only serves to supplement the energy supply from conventional power plants. The desire for an always available and sufficient energy supply requires the need for energy storage in order to avoid fluctuations in energy loss. From this perspective, the authors of the contribution under consideration report on underfloor pumped storage plants in the coal industry.

  13. Potential study for pump storage plants in Baden-Wuerttemberg; Potenzialstudie fuer Pumpspeicherkraftwerke in Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Berger, Claudia [EnBW Kraftwerke AG, Stuttgart (Germany); Sauer, Nikolaus [EnBW Holding AG, Karlsruhe (Germany); Achatz, Robert [HPI Hydroprojekt Ingenieurgesellschaft mbH, Muenchen (Germany)

    2013-06-01

    Power of renewable energies is increasingly produced by fluctuated energy sources like wind or solar. To replace the current electricity of mostly nuclear power and coal fired plants, there is a need of storage possibilities in times of low demand. In times of high demand the electricity could be delivered directly by turbines. Today only one technology cope with this economically and commercially: pump storage plants. They operate like big batteries in the grid and can protect grid stability. (orig.)

  14. PUMPS

    Science.gov (United States)

    Thornton, J.D.

    1959-03-24

    A pump is described for conveving liquids, particure it is not advisable he apparatus. The to be submerged in the liquid to be pumped, a conduit extending from the high-velocity nozzle of the injector,and means for applying a pulsating prcesure to the surface of the liquid in the conduit, whereby the surface oscillates between positions in the conduit. During the positive half- cycle of an applied pulse liquid is forced through the high velocity nozzle or jet of the injector and operates in the manner of the well known water injector and pumps liquid from the main intake to the outlet of the injector. During the negative half-cycle of the pulse liquid flows in reverse through the jet but no reverse pumping action takes place.

  15. Simulating on water storage and pump capacity of "Kencing" river polder system in Kudus regency, Central Java, Indonesia

    Science.gov (United States)

    Wahyudi, Slamet Imam; Adi, Henny Pratiwi; Santoso, Esti; Heikoop, Rick

    2017-03-01

    Settlement in the Jati District, Kudus Regency, Central Java Province, Indonesia, is growing rapidly. Previous paddy fields area turns into new residential, industrial and office buildings. The rain water collected in small Kencing river that flows into big Wulan River. But the current condition, during high rain intensity Wulan river water elevation higher than the Kencing river, so that water can not flow gravity and the area inundated. To reduce the flooding, required polder drainage system by providing a long channel as water storage and pumping water into Wulan river. How to get optimal value of water storage volume, drainage system channels and the pump capacity? The result used to be efficient in the operation and maintenance of the polder system. The purpose of this study is to develop some scenarios water storage volume, water gate operation and to get the optimal value of operational pumps removing water from the Kencing River to Wulan River. Research Method is conducted by some steps. The first step, it is done field orientation in detail, then collecting secondary data including maps and rainfall data. The map is processed into Watershed or catchment area, while the rainfall data is processed into runoff discharge. Furthermore, the team collects primary data by measuring topography to determine the surface and volume of water storage. The analysis conducted to determine of flood discharge, water channel hydraulics, water storage volume and pump capacity corresponding. Based on the simulating of long water storage volume and pump capacity with some scenario trying, it can be determined optimum values. The results used to be guideline in to construction proses, operation and maintenance of the drainage polder system.

  16. FY 17 Q1 Commercial integrated heat pump with thermal storage milestone report

    Energy Technology Data Exchange (ETDEWEB)

    Abu-Heiba, Ahmad [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Baxter, Van D. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shen, Bo [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rice, C. Keith [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2017-01-01

    The commercial integrated heat pump with thermal storage (AS-IHP) offers significant energy saving over a baseline heat pump with electric water heater. The saving potential is maximized when the AS-IHP serves coincident high water heating and high space cooling demands. A previous energy performance analysis showed that the AS-IHP provides the highest benefit in the hot-humid and hot-dry/mixed dry climate regions. Analysis of technical potential energy savings for these climate zones based on the BTO Market calculator indicated that the following commercial building market segments had the highest water heating loads relative to space cooling and heating loads education, food service, health care, lodging, and mercantile/service. In this study, we focused on these building types to conservatively estimate the market potential of the AS-IHP. Our analysis estimates maximum annual shipments of ~522,000 units assuming 100% of the total market is captured. An early replacement market based on replacement of systems in target buildings between 15 and 35 years old was estimated at ~136,000 units. Technical potential energy savings are estimated at ~0.27 quad based on the maximum market estimate, equivalent to ~13.9 MM Ton CO2 emissions reduction.

  17. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches: UPH

    Science.gov (United States)

    1981-06-01

    The development of the design approaches used to determine the plant and overall layout for a underground pumped hydroelectric (UPH) storage facility having a maximum generating capacity of 2000 MW and a storage capacity of 20,000 MWh is discussed. Key factors were the selection of the high head pump-turbine equipment and the geotechnical considerations relevant to the underground cavern designs. The comparison of pump-turbine alternatives is described leading to the selection for detailed study of both a single-step configurations, using multistage reversible pump-turbines, and a two-step configuration, with single-stage reversible pump-turbines.

  18. Wind power integration with heat pumps, heat storages, and electric vehicles – Energy systems analysis and modelling

    DEFF Research Database (Denmark)

    Hedegaard, Karsten

    The fluctuating and only partly predictable nature of wind challenges an effective integration of large wind power penetrations. This PhD thesis investigates to which extent heat pumps, heat storages, and electric vehicles can support the integration of wind power. Considering the gaps in existin...

  19. Increasing RES Penetration and Security of Energy Supply by Use of Energy Storages and Heat Pumps in Croatian Energy System

    DEFF Research Database (Denmark)

    Krajačić, Goran; Mathiesen, Brian Vad; Duić, Neven;

    2010-01-01

    In this paper integration of wind power generation into the Croatian electricity supply is analysed using available technologies. The starting point is a model of the energy system in Croatia in 2007. Comprehensive hour-by-hour energy system analyses are conducted of a complete system meeting...... electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped hydro and heat pumps in combination with heat storages...... with specific regulation of power system could additionally increase wind penetration for 0.37 TWh. Hence, with the current technologies installed in the Croatian energy system the installed pumped hydro-plant may facilitate more than 10% wind power in the electricity system. Large-scale integration of wind...

  20. Deriving Optimal End of Day Storage for Pumped-Storage Power Plants in the Joint Energy and Reserve Day-Ahead Scheduling

    Directory of Open Access Journals (Sweden)

    Manuel Chazarra

    2017-06-01

    Full Text Available This paper presents a new methodology to maximise the income and derive the optimal end of day storage of closed-loop and daily-cycle pumped-storage hydropower plants. The plants participate in the day-ahead energy market as a price-taker and in the secondary regulation reserve market as a price-maker, in the context of the Iberian electricity system. The real-time use of the committed reserves is considered in the model formulation. The operation of the plants with the proposed methodology is compared to the ones that use an end of day storage of an empty reservoir or half of the storage capacity. Results show that the proposed methodology increases the maximum theoretical income in all the plants analysed both if they only participate in the day-ahead energy market and if they also participate in the secondary regulation service. It is also shown that the increase in the maximum theoretical income strongly depends on the size of the plant. In addition, it is proven that the end of day storages change notably in the new reserve-driven strategies of pumped-storage hydropower plants and that the proposed methodology is even more recommended if the secondary regulation service is considered.

  1. Modulation of pulmonary NA+ pump gene expression during cold storage and reperfusion.

    Science.gov (United States)

    Kim, J D; Baker, C J; Danto, S I; Starnes, V A; Barr, M L

    2000-10-15

    Reperfusion injury with pulmonary edema continues to be a major complication after lung transplantation. Alveolar fluid homeostasis is regulated by Na+/K+-ATPase activity on the basolateral surface of alveolar epithelial cells. Intact Na+/K+-ATPase is essential to the resolution of pulmonary edema. We characterized the effects of cold ischemia and reperfusion on expression of Na+/K+-ATPase mRNA and protein. Baseline values for Na+/K+-ATPase mRNA and protein were determined from freshly harvested lungs with no cold storage time or reperfusion (group I). Group II lungs were analyzed after cold storage times of 12 or 24 hr without subsequent reperfusion. Group III lungs were analyzed after cold storage times of 12 or 24 hr with subsequent reperfusion. Lungs were flushed with either Euro-Collins (EC) or University of Wisconsin (UW) solution in each group. All samples were quantified for Na+/K+-ATPase mRNA and Na+/K+-ATPase protein. Physiological parameters including oxygenation and compliance were also measured. There were no significant differences in the level of mRNA and protein for samples that were cold stored without reperfusion (group II). With reperfusion (group III) there was a significant increase in the level of the Na+/K+-ATPase mRNA after 12 hr of storage for both EC and UW. After 24 hr of storage and subsequent reperfusion, lungs flushed with EC had significantly decreased Na+/K+-ATPase protein and mRNA, although lungs preserved with UW maintained their increased levels of Na+/K+-ATPase protein and mRNA. Our data suggest that ischemia-reperfusion injury results in an initial up-regulation of Na+/K+-ATPase mRNA. With prolonged injury in lungs preserved with EC, the level of the mRNA decreased with a corresponding decrease in the Na+/K+-ATPase protein. The different response seen in EC versus UW may be explained by better preservation of pump function with UW than EC and correlates with improved physiological function in lungs preserved with UW solution.

  2. Modernisation of pumped storage power plant Waldeck I. Overhaul upper basin; Modernisierung des Pumpspeicherkraftwerkes Waldeck I. Sanierung des Oberbeckens

    Energy Technology Data Exchange (ETDEWEB)

    Koehn, Rolf-Guenter [Lahmeyer International, Bad Vilbel (Germany); Rau, Martin [E.ON Wasserkraft GmbH, Landshut (Germany)

    2010-07-01

    The Waldeck I pumped storage power plant is located near the Edersee Lake in Northern Hesse. The existing power plant, comprising four horizontal turbine and pump combination units with a total installed capacity of 140 MW, was commissioned in 1932. After some 75 years of operation, the plant had reached the end of its service life and the following modernisation concept was developed: Construction on the existing site of a new shaft power house with a pump turbine of approximately 70 MW capacity and refurbishment of two of the Francis turbines and decommissioning of all four pumps and two turbines in the old plant. The existing upper basin will be retained and extensively overhauled, including waterproof lining of the internal walls using a drained synthetic sealing membrane. (orig.)

  3. Solar assisted absorption or motor driven heat pump with earth seasonal storage: Part 1, Final report, 1 July 1982-30 June 1985

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1986-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behavior of the various components and their interaction. The surveys went on during two years. The following operations are considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  4. Evaluation of advanced hydraulic turbomachinery for underground pumped hydroelectric storage. Part 1. Single-stage regulated pump turbines for operating heads of 500 to 1000 m

    Energy Technology Data Exchange (ETDEWEB)

    Frigo, A.A.; Blomquist, C.A.; Degnan, J.R.

    1979-10-01

    High-head, large-capacity turbomachinery is needed for the concept of underground pumped hydroelectric storage to be technically and economically attractive. Single-stage, reversible, Francis-type pump turbines with adjustable wicket gates appear to offer the most economically attractive option for heads between about 500 and 1000 m. The feasibility of developing these types of machines for capacities up to 500 MW and operating heads up to 1000 m has been evaluated. Preliminary designs have been generated for six single-stage pump turbines. The designs are for capacities of 350 and 500 MW and for operating heads of 500, 750, and 1000 m. The report contains drawings of the machines along with material specifications and hydraulic performance data. Mechanical, hydraulic, and economic analyses indicate that these machines will behave according to the criteria used to design them and that they can be built at a reasonable cost. The stress and deflection responses of the 500-MW, 100-m-head pump turbine, determined by detailed finite element analysis techniques, give solid evidence of the integrity of the conceptual designs of the six units and indicate no unsolvable problems. Results of a life expectancy analysis of the wicket gates indicate that a near infinite life can be expected for these components when they are subjected to normal design loads. Efficiencies of 90.7 and 91.4% in the generating and pumping modes, respectively, can be expected for the 500-MW, 1000-m-head unit. Performances of the other five machines are comparable. The specific costs of the pump turbines in mid-1978 US dollars per kW vary from 19.2 to 11.8 over a head range of from 500 to 1000 m for the 500-MW machines and from 20.0 to 12.3 for the 350-MW machines.

  5. Energy Optimization for Transcritical CO2 Heat Pump for Combined Heating and Cooling and Thermal Storage Applications

    DEFF Research Database (Denmark)

    Do Carmo, Carolina Madeira Ramos; Blarke, Morten; Yazawa, Kazuaki

    2012-01-01

    A transcritical heat pump (THP) cycle using carbon dioxide (CO2) as the refrigerant is known to feature an excellent coefficient of performance (COP) as a thermodynamic system. Using this feature, we are designing and building a system that combines a water-to-water CO2 heat pump with both hot...... and cold thermal storages know as Thermal Battery (TB) (Blarke, 2012). Smart and effective use of intermittent renewable energy resources (for example solar and wind power) is obtained supplying water heating (>70 oC) and cooling services (

  6. Combining Wind and Pumped Hydro Energy Storage for Renewable Energy Generation in Ireland

    Directory of Open Access Journals (Sweden)

    Alice Coburn

    2014-01-01

    Full Text Available Ireland has one of the highest wind energy potentials in Europe. The intermittent nature of wind makes this renewable resource impractical as a sole source of energy. Combining wind energy with pumped hydro energy storage (PHES can overcome this intermittency, consuming energy during low-demand periods and supplying energy for periods of high demand. Currently Ireland has a number of hydroelectric power plants and wind farms of various scales in operation. A feasibility study was conducted to investigate the potential of securing a reliable source of renewable energy by increasing the penetration of hydroelectric power by means of combined wind-PHES developments. The greatest wind potential is experienced along the western coast of Ireland and a number of sites were identified here which satisfied a minimum mean wind speed criterion of 10.5 ms−1. Each site was then further evaluated according to topographical requirements for PHES. All but two of the identified sites are immediately unsuitable due to the presence of areas protected under European legislation; this highlights the nonenergy related obstacles in the path of renewable energy generation in Ireland and suggests that a compromise should be researched which could facilitate both renewable energy generation and species and habitat protection in Europe.

  7. Integration of Variable Speed Pumped Hydro Storage in Automatic Generation Control Systems

    Science.gov (United States)

    Fulgêncio, N.; Moreira, C.; Silva, B.

    2017-04-01

    Pumped storage power (PSP) plants are expected to be an important player in modern electrical power systems when dealing with increasing shares of new renewable energies (NRE) such as solar or wind power. The massive penetration of NRE and consequent replacement of conventional synchronous units will significantly affect the controllability of the system. In order to evaluate the capability of variable speed PSP plants participation in the frequency restoration reserve (FRR) provision, taking into account the expected performance in terms of improved ramp response capability, a comparison with conventional hydro units is presented. In order to address this issue, a three area test network was considered, as well as the corresponding automatic generation control (AGC) systems, being responsible for re-dispatching the generation units to re-establish power interchange between areas as well as the system nominal frequency. The main issue under analysis in this paper is related to the benefits of the fast response of variable speed PSP with respect to its capability of providing fast power balancing in a control area.

  8. Optimization of the weekly operation of a multipurpose hydroelectric development, including a pumped storage plant

    Energy Technology Data Exchange (ETDEWEB)

    Popa, R; Popa, B [Faculty of Power Engineering, University Politehnica of Bucharest, 313 Spl. Independentei, sect. 6, Bucharest, 060042 (Romania); Popa, F [Institute for Hydropower Studies and Design, 5-7 Vasile Lascar, sect. 2, Bucharest, 020491 (Romania); Zachia-Zlatea, D, E-mail: bogdan.popa@rosha.r [Hidroelectrica S.A., 3 Constantin Nacu, sect. 2, Bucharest, 020995 (Romania)

    2010-08-15

    It is presented an optimization model based on genetic algorithms for the operation of a multipurpose hydroelectric power development consisting in a pumped storage plant (PSP) with weekly operation cycle. The lower reservoir of the PSP is supplied upstream from a peak hydropower plant (HPP) with a large reservoir and supplies the own HPP which provides the required discharges towards downstream. Under these conditions, the optimum operation of the assembly consisting in 3 reservoirs and hydropower plants becomes a difficult problem if there are considered the restrictions as regards: the gradients allowed for the reservoirs filling/emptying, compliance with of a long-term policy of the upper reservoir from the hydroelectric development and of the weekly cycle for the PSP upper reservoir, correspondence between the power output/consumption in the weekly load schedule, turning to account of the water resource at maximum overall efficiencies, etc. Maximization of the net energy value (generated minus consumed) was selected as performance function of the model, considering the differentiated price of the electric energy over the week (working or weekend days, peak, half-peak or base hours). The analysis time step was required to be of 3 hours, resulting a weekly horizon of 56 steps and 168 decision variables, respectively, for the 3 HPPs of the system. These were allowed to be the flows turbined at the HPP and the number of working hydrounits at PSP, on each time step. The numerical application has considered the guiding data of Fantanele-Tarnita-Lapustesti hydroelectric development. Results of various simulations carried out proved the qualities of the proposed optimization model, which will allow its use within a decisional support program for such a development.

  9. Optimization of the weekly operation of a multipurpose hydroelectric development, including a pumped storage plant

    Science.gov (United States)

    Popa, R.; Popa, F.; Popa, B.; Zachia-Zlatea, D.

    2010-08-01

    It is presented an optimization model based on genetic algorithms for the operation of a multipurpose hydroelectric power development consisting in a pumped storage plant (PSP) with weekly operation cycle. The lower reservoir of the PSP is supplied upstream from a peak hydropower plant (HPP) with a large reservoir and supplies the own HPP which provides the required discharges towards downstream. Under these conditions, the optimum operation of the assembly consisting in 3 reservoirs and hydropower plants becomes a difficult problem if there are considered the restrictions as regards: the gradients allowed for the reservoirs filling/emptying, compliance with of a long-term policy of the upper reservoir from the hydroelectric development and of the weekly cycle for the PSP upper reservoir, correspondence between the power output/consumption in the weekly load schedule, turning to account of the water resource at maximum overall efficiencies, etc. Maximization of the net energy value (generated minus consumed) was selected as performance function of the model, considering the differentiated price of the electric energy over the week (working or weekend days, peak, half-peak or base hours). The analysis time step was required to be of 3 hours, resulting a weekly horizon of 56 steps and 168 decision variables, respectively, for the 3 HPPs of the system. These were allowed to be the flows turbined at the HPP and the number of working hydrounits at PSP, on each time step. The numerical application has considered the guiding data of Fantanele-Tarnita-Lapustesti hydroelectric development. Results of various simulations carried out proved the qualities of the proposed optimization model, which will allow its use within a decisional support program for such a development.

  10. The integration of water loop heat pump and building structural thermal storage systems

    Energy Technology Data Exchange (ETDEWEB)

    Marseille, T.J.; Schliesing, J.S.

    1991-10-01

    Many commercial buildings need heat in one part and, at the same time, cooling in another part. Even more common is the need for heating during one part of the day and cooling during another in the same spaces. If that energy could be shifted or stored for later use, significant energy might be saved. If a building's heating and cooling subsystems could be integrated with the building's structural mass and used to collect, store, and deliver energy, the energy might be save cost-effectively. To explore this opportunity, researchers at the Pacific Northwest Laboratory (PNL) examined the thermal interactions between the heating, ventilating, and air-conditioning (HVAC) system and the structure of a commercial building. Computer models were developed to simulate the interactions in an existing building located in Seattle, Washington, to determine how these building subsystems could be integrated to improve energy efficiency. The HVAC subsystems in the existing building were modeled. These subsystems consist of decentralized water-source heat pumps (WSHP) in a closed water loop, connected to cooling towers for heat rejection during cooling mode and boilers to augment heating. An initial base case'' computer model of the Seattle building, as-built, was developed. Metered data available for the building were used to calibrate this model to ensure that the analysis would provide information that closely reflected the operation of a real building. The HVAC system and building structure were integrated in the model using the concrete floor slabs as thermal storage media. The slabs may be actively charged during off-peak periods with the chilled water in the loop and then either actively or passively discharged into the conditioned space during peak periods. 21 refs., 37 figs., 17 tabs.

  11. Combined Modular Pumped Hydro Energy Storage Plus Solar PV Proposal for Rio Rancho High School, New Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Bibeault, Mark Leonide [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-08-25

    This is a proposal to locate a combined Modular Pumped Hydro (MPH) Energy Storage plus PV solar facility at Rio Rancho High School, NM. The facility will functionally provide electricity at night derived from renewable solar energy. Additionally the facility will provide STEM related educational opportunities for students and staff of the school, public community outreach, and validation of an energy storage approach applicable for the Nation (up to 1,000,000 kWh per installation). The proposal will summarize the nature of electricity, why energy storage is useful, present the combined MPH and solar PV production design, present how the actual design will be built and operated in a sustainable manner, how the project could be funded, and how the project could be used in STEM related activities.

  12. Underground Pumped Storage Hydropower using abandoned open pit mines: influence of groundwater seepage on the system efficiency

    Science.gov (United States)

    Pujades, Estanislao; Bodeux, Sarah; Orban, Philippe; Dassargues, Alain

    2016-04-01

    Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand energy periods, respectively. Nevertheless, PSH plants require a determined topography because two reservoirs located at different heights are needed. At sites where PSH plants cannot be constructed due to topography requirements (flat regions), Underground Pumped Storage Hydropower (UPSH) plants can be used to adjust the electricity production. These plants consist in two reservoirs, the upper one is located at the surface (or at shallow depth) while the lower one is underground (or deeper). Abandoned open pit mines can be used as lower reservoirs but these are rarely isolated. As a consequence, UPSH plants will interact with surrounding aquifers exchanging groundwater. Groundwater seepage will modify hydraulic head inside the underground reservoir affecting global efficiency of the UPSH plant. The influence on the plant efficiency caused by the interaction between UPSH plants and aquifers will depend on the aquifer parameters, underground reservoir properties and pumping and injection characteristics. The alteration of the efficiency produced by the groundwater exchanges, which has not been previously considered, is now studied numerically. A set of numerical simulations are performed to establish in terms of efficiency the effects of groundwater exchanges and the optimum conditions to locate an UPSH plant.

  13. Investigation of Hg/sub 2/ as a discharge pumped optical storage medium

    Energy Technology Data Exchange (ETDEWEB)

    Ehrlich, D J; Osgood, Jr, R M

    1978-12-01

    The report describes work performed in the period 1 October 1977 to 30 September 1978 on the extraction of energy from metastable Hg/sub 2/ by optical techniques. The major accomplishments have included: (1) assessment of optical extraction techniques for laser fusion applications; (2) demonstration of 20X enhancements in the population of the UV-radiating level by optical pumping with mid-IR lasers; (3) analysis of the IR optical pumping process through the induced emission spectrum; (4) parametric studies of the excitation wavelength, temperature and pressure dependences of extraction by optical pumping; (5) studies of the saturation of mid-IR optical pumping; (6) modeling of large-scale extraction for laser fusion applications; (7) studies of optical pumping of Hg/sub 2/ by high power ArF laser (193 nm) radiation; and (8) studies of Hg/sub 2/ excimer structure and collisional destruction rates.

  14. Thermal storage in a heat pump heated living room floor for urban district power balancing - effects on thermal comfort, energy loss and costs for residents

    NARCIS (Netherlands)

    Leeuwen, van R.P.; Wit, de J.B.; Fink, J.; Smit, G.J.M.

    2014-01-01

    For the Dutch smart grid demonstration project Meppelenergie, the effects of controlled thermal energy storage within the floor heating structure of a living room by a heat pump are investigated. Storage possibilities are constrained by room operative and floor temperatures. Simulations indicate lim

  15. Thermal storage in a heat pump heated living room floor for urban district power balancing - effects on thermal comfort, energy loss and costs for residents

    NARCIS (Netherlands)

    van Leeuwen, Richard Pieter; de Wit, J.B.; Fink, J.; Smit, Gerardus Johannes Maria

    2014-01-01

    For the Dutch smart grid demonstration project Meppelenergie, the effects of controlled thermal energy storage within the floor heating structure of a living room by a heat pump are investigated. Storage possibilities are constrained by room operative and floor temperatures. Simulations indicate lim

  16. A novel static frequency converter based on multilevel cascaded H-bridge used for the startup of synchronous motor in pumped-storage power station

    Energy Technology Data Exchange (ETDEWEB)

    Wang Feng, E-mail: sjtuwfeng@hotmail.co [Key Lab of Control of Power Transmission and Transformation, Ministry of Education, Department of Electrical Engineering, Shanghai Jiaotong University, Minhang District, Shanghai 200240 (China); Jiang Jianguo, E-mail: jiang@sjtu.edu.c [Key Lab of Control of Power Transmission and Transformation, Ministry of Education, Department of Electrical Engineering, Shanghai Jiaotong University, Minhang District, Shanghai 200240 (China)

    2011-05-15

    Research highlights: {yields} A novel Static Frequency Converter (SFC) based on multilevel cascaded H-bridge (CHB) topology is proposed and used for the reversible pump-generating units in pumped-storage power station. {yields} The novel SFC based on CHB has compact configuration, low current harmonic distortion and fast speed response. {yields} Rotor position and Grid connection are realized successfully by the novel SFC. -- Abstract: A novel static frequency converter (SFC) is proposed and is used firstly to start the reversible pump-generating units in pumped-storage power station. Multilevel cascaded H-bridge (CHB) topology and Insulated Gate Bipolar Transistor (IGBT) are applied in the novel SFC. In comparison with the conventional SFC adopting load-commutated inverter (LCI) which is composed of silicon-controlled rectifier (SCR), the novel one has plenty of advantages such as compact configuration, low current harmonic distortion and fast speed response, and these advantages have been verified during 2-year operation at Xiang Hong Dian Pumped-storage power station in China. This application shows that the novel SFC greatly enhances the reliability and success rate of connecting to grid for starting up the pump-generating units. The principle, characteristic and performance of the novel SFC are described in this paper, and some key issues related to the startup of the units of the pumped-storage power station are also presented.

  17. 抽水蓄能电站可逆式水泵水轮机发展现状与展望%Development of Reversible Pump-Turbines in Pumped Storage Power Stations and Their Prospects

    Institute of Scientific and Technical Information of China (English)

    赵万勇; 马达; 曾玲

    2012-01-01

    On the basis of wind power development in Gansu province and the pumped storage development of the world.the necessity of developing our pumped storage power stations in China is elaborated. Various types of hydraulic pump-turbines in pumped storage power stations are introduced (the tendency of development of reversible hydraulic pump-turbines are discussed;the domestic and international studies in this field are also related. It is pointed out that in China,the R&-D ability of pumped storage power stations is still low,but we have a bright future.%从甘肃省的风电发展和世界抽水蓄能发展情况讨论了我国抽水蓄能电站建设的必要性;介绍了抽水蓄能电站中水泵水轮机的各种型式,分析了国内外在这方面的研究现状;对可逆式水泵水轮机的发展趋势和存在的问题进行了探讨;认为仍需加强我国抽水蓄能电站机组的研发能力,并展望了我国抽水蓄能电站的发展宏图.

  18. Evaluation of the feasibility and viability of modular pumped storage hydro (m-PSH) in the United States

    Energy Technology Data Exchange (ETDEWEB)

    Witt, Adam M. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Hadjerioua, Boualem [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Martinez, Rocio [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Bishop, Norm [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

    2015-09-01

    The viability of modular pumped storage hydro (m-PSH) is examined in detail through the conceptual design, cost scoping, and economic analysis of three case studies. Modular PSH refers to both the compactness of the project design and the proposed nature of product fabrication and performance. A modular project is assumed to consist of pre-fabricated standardized components and equipment, tested and assembled into modules before arrival on site. This technology strategy could enable m-PSH projects to deploy with less substantial civil construction and equipment component costs. The concept of m-PSH is technically feasible using currently available conventional pumping and turbine equipment, and may offer a path to reducing the project development cycle from inception to commissioning.

  19. A contribution to water hammer analysis in pumped-storage power plants; Ein Beitrag zur Druckstossberechnung von Pumpspeicheranlagen

    Energy Technology Data Exchange (ETDEWEB)

    Hoeller, Stefan; Jaberg, Helmut [TU Graz (Austria). Inst. fuer Hydraulische Stroemungsmaschinen

    2013-03-01

    The operation of pumped-storage power plants induces a highly transient fluid flow in the penstock of high head water power plants. In the planning phase a reliable prediction of the transient plant behaviour in unsteady load cases such as e.g. machine start or switching load cases is necessary. Numerical simulation methods provide a tool to calculate the occurring pressure pulsations or mass oscillations as well as for the optimization of the transient behaviour. Commercial software-packages for water hammer simulations usually do not provide numerical models for a realistic calculation of complex components like surge tanks, turbines or emergency closing valves in a high head water power plant. But especially these components need to be modelled correctly in order to get a significant and reliable solution. This article shows the practice ofthe development of a custom-designed numerical model on the example of a pump turbine. (orig.)

  20. HydroHelp 5 : an excel program developed for pre-feasibility assessment of pump-storage hydroelectric sites

    Energy Technology Data Exchange (ETDEWEB)

    Gordon, J.L.

    2009-01-15

    A series of programs known as HydroHelp have been developed in order to help engineers obtain an initial assessment of a hydro site, with minimum site data. All programs within the series use Microsoft Office, Excel 2003 on Windows XP. This paper presented the HydroHelp software that was developed for the pre-feasibility assessment of pump-storage hydroelectric sites. The paper presented the data input sheet for a pump-turbine project which included detailed instructions on program operation. A schematic of underground work was also provided. The paper reviewed calculations performed by the program, including all basic structure dimensions ranging from reservoir wave heights and the corresponding average rip-rap size on the dam, to the capacity of the powerhouse crane. Cost estimates and a cost summary report were also presented. tabs., figs.

  1. Hydrodynamic Analysis of the Flow in an Axial Rotor and Impeller for Large Storage Pump

    Science.gov (United States)

    Bosioc, A. I.; Muntean, S.; Draghici, I.; Anton, L. E.

    2016-11-01

    In hydropower systems among hydropower plants there are integrated pumping stations (PS). In order to ensure higher flow rate, the pumps have constructive differences besides regular. Consequently, the complex shape of the suction-elbow with symmetric inlet generates an unsteady flow which is ingested by impeller. These phenomena's also generate stronger unsteady flow conditions, such as stall, wakes, turbulence and pressure fluctuations, which affect the overall mechanical behaviour of the pump with vibration, noise and radial and axial forces on the rotor. Alternatively, an axial rotor can be installed in front of the impeller. In this case, the flow non-uniformity will be decreased and the static pressure will be increased at the impeller inlet. Consequently, the efficiency behaviour practically remains unchanged while the cavitational behaviour is improved. From the assembly between axial rotor and centrifugal impeller, the axial rotor usually works in cavitation and is often replaced. The paper investigates experimentally and numerically the comparison between pump impeller without and with axial rotor hydrodynamics taking into account the flow given by the symmetrical suction elbow. Full three-dimensional turbulent numerical investigation of the symmetrical suction elbow, with axial rotor and without, pump impeller and volute are performed. The hydrodynamic analysis confirms that once the axial rotor is mounted in front of the pump impeller increase the static pressure and the incidence angle is improved at the inlet of the pump impeller.

  2. Study and Test of Cold Storage Heat Recovery Heat Pump Coupled Solar Drying Device

    Directory of Open Access Journals (Sweden)

    Min Li

    2013-05-01

    Full Text Available In this study, we design the recovery of a heat pump combined solar drying device. Then, with this device, drying experiments of aquatic product, tilapia, were conducted, indicating that the newly designed device functions are well in temperature adjusting and controlling performance and showing that drying time is closely related to energy consumption and drying conditions. Heat recovery heat pump combined solar energy drier can improve the drying quality of aquatic products, but also can greatly reduce the drying energy consumption, which provides theoretical support to the design and processing of heat recovery heat pump of refrigeration system coupled solar drying device.

  3. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 1: Executive summary

    Science.gov (United States)

    1981-05-01

    A preliminary design study of water compensated Compressed Air Energy Storage (CAES) and Underground Pumped Hydroelectric (UPH) plants for siting in geological conditions suitable for hard rock excavations was performed. The study was divided into five primary tasks as follows: establishment of design criteria and analysis of impact on power system; selection of site and establishment of site characteristics; formulation of design approaches; assessment of environmental and safety aspects; and preparation of preliminary design of plant. The salient aspects considered and the conclusions reached during the consideration of the five primary tasks for both CAES and UPH are presented.

  4. Study and Test of Cold Storage Heat Recovery Heat Pump Coupled Solar Drying Device

    OpenAIRE

    Min Li; Xiao-Qiang Jiang; Bao-Chuan Wu

    2013-01-01

    In this study, we design the recovery of a heat pump combined solar drying device. Then, with this device, drying experiments of aquatic product, tilapia, were conducted, indicating that the newly designed device functions are well in temperature adjusting and controlling performance and showing that drying time is closely related to energy consumption and drying conditions. Heat recovery heat pump combined solar energy drier can improve the drying quality of aquatic products, but also can gr...

  5. An energy-saving pumping system with novel springs energy storage devices: Design, modeling, and experiment

    Directory of Open Access Journals (Sweden)

    Hong jun Meng

    2017-01-01

    Full Text Available For the traditional reciprocating pumping unit, it generally starts at the bottom dead point with full load and is accelerated when starting and decelerated when stopping, which not only requires great energy from the motor but also impact on the output torque of motor. In order to tackle the above problems, we propose an energy-saving smooth reversing pumping system, which could store the energy in deceleration by making use of springs, and the stored energy could be reused in acceleration after reversion. This novel system targets to make the motor starting with light load, which could reduce the fluctuation in motor torque, decrease the starting time. In this article, a dynamic model and an efficiency model are established to compute the polished rod load dynamometer card and efficiency of the pumping unit. It is shown that the installed springs could help to reduce the impact on the system when reversing, and significantly decrease the energy consumption. In addition, we set up the real pumping system with load test system to verify the effectiveness of the model establishment. Through the experiment, the proposed pumping system could save energy up to 9.204% as compared to the traditional reciprocating pumping system.

  6. Microbial Carbon Pump ---A New Mechanism for Long-Term Carbon Storage in the Global Ocean (Invited)

    Science.gov (United States)

    Jiao, N.; Azam, F.; McP Working Group; Scor Wg134

    2010-12-01

    Marine dissolved organic matter (DOM) reservoir, containing carbon equivalent to the total carbon inventory of atmospheric CO2, is an important issue in understanding the role of the ocean in climate change. The known biological mechanism for oceanic carbon sequestration is the biological pump, which depends on vertical transportation of carbon either through particulate organic matter (POM) sedimentation or DOM export by mixing and downwelling. Both the POM and the DOM are subject to microbial mineralization and most of the organic carbon will be returned to dissolved inorganic carbon within a few decades. Only a small fraction of the POM escapes mineralization and reaches the sediment where organic carbon can be buried and stored for thousands and even millions of years. The efficiency of the biological pump is currently the basic measure of the ocean’s ability to store biologically fixed carbon. However, the production and fate of the large pool of recalcitrant DOM with an averaged turnover time of 4000-6000 thousands of years in the water column has not been adequately considered to date. Marine microbes essentially monopolize the utilization of DOM. Although their diverse adaptive strategies for using newly fixed carbon are well known, major gaps exist in our knowledge on how they interact with the large pool of DOM that appears to be recalcitrant. This is an important problem, as DOM molecules that are not degraded for extended periods of time constitute carbon storage in the ocean. A newly proposed concept - the “microbial carbon pump (MCP)” (NATURE REVIEWS Microbiology 2010.8:593-599) (also see diagram below) provides a formalized focus on the significance of microbial processes in carbon storage in the recalcitrant DOM reservoir, and a framework for testing hypotheses on the sources and sinks of DOM and the underlying biogeochemical mechanisms. The MCP, through concessive processing of DOM, transforms some organic carbon from the reactive DOM pools

  7. Rethinking Pumped Storage Hydropower in the European Alps: A Call for New Integrated Assessment Tools to Support the Energy Transition

    Directory of Open Access Journals (Sweden)

    Astrid Björnsen Gurung

    2016-05-01

    Full Text Available The European Alps are well positioned to contribute significantly to the energy transition. In addition to sites with above-average potential for wind and solar power, the “water towers” of Europe provide flexible, low-carbon power generation as well as energy storage. In the future, hydropower systems are expected to become more than mere electricity generators, serving a key role as flexible complements to intermittent power generators and as providers of large-scale seasonal and daily energy storage. Energy transition on national and European scales can be facilitated by expanding the capacity of pumped storage hydropower (PSHP plants. Yet the extension of hydropower production, in particular PSHP, remains controversial, primarily due to environmental concerns. Focusing on 2 Alpine countries, Austria and Switzerland, this paper provides a system view of hydropower production and energy storage in the Alps. It discusses advantages and drawbacks of various assessment tools and identifies gaps and needs for the integrated assessment of PSHP plants. It concludes that instruments that evaluate the impacts and sustainability of PSHP projects need to be developed, elaborated, and applied in a participatory manner, in order to promote public dialogue, increase social acceptance, and, ideally, encourage energy consumers to become advocates of a sustainable energy future.

  8. Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

    Directory of Open Access Journals (Sweden)

    Ming-Tse Kuo

    2013-07-01

    Full Text Available Taiwan’s power system is isolated and not supported by other interconnected systems. Consequently, the system frequency immediately reflects changes in the system loads. Pumped storage units are crucial for controlling power frequency. These units provide main or auxiliary capacities, reducing the allocation of frequency-regulating reserve (FRR and further reducing generation costs in system operations. Taiwan’s Longmen Nuclear Power Plant is set to be converted for commercial operations, which will significantly alter the spinning reserves in the power system. Thus, this study proposes a safe and economic pumped storage unit dispatch strategy. This strategy is used to determine the optimal FRR capacity and 1-min recovery frequency in a generator failure occurrence at the Longmen Power Plant. In addition, this study considered transmission capacity constraints and conducted power flow analysis of the power systems in Northern, Central, and Southern Taiwan. The results indicated that, in the event of a failure at Longmen Power Plant, the proposed strategy can not only recover the system frequency to an acceptable range to prevent underfrequency load-shedding, but can also mitigate transmission line overloading.

  9. Determination of the critical time of canal storage capacity controlled by cross pump stations “Case Study: Egypt, El-Salam Canal”

    Directory of Open Access Journals (Sweden)

    Ahmed M. El-Belasy

    2013-06-01

    Full Text Available El-Salam Pump Stations (1 and (2 are located at 22.1 km and 54.3 km respectively at El-Salam Canal. When El-Salam Pump Station (1 is in operation, and switching off El-Salam Pump Station (2, water level rises upstream El-Salam Pump Station (2. Water level overtops El-Salam Pump Station (2 and banks upstream it. Flooding then takes place as Wadi El Noqra Canal, Egypt. This necessitates discharging the excess water to protect the pump station and the canal from water flooding when the electricity is shut down. The hydrodynamic simulation of El-Salam Canal determinates the critical time for storage capacity according to location and type of emergency spillways through the numerical model to prevent water overtopping upstream pump stations. Determination of the critical time of storage capacity is considered as a new parameter in case of the hydraulic design of the canal controlled by cross pump stations.

  10. Enhanced Open Ocean Storage of CO2 from Shelf Sea Pumping

    NARCIS (Netherlands)

    Thomas, H.; Bozec, Y.; Elkalay, K.; de Baar, H.J.W.

    2004-01-01

    Seasonal field observations show that the North Sea, a Northern European shelf sea, is highly efficient in pumping carbon dioxide fromthe atmosphere to the North Atlantic Ocean. The bottom topography–controlled stratification separates production and respiration processes in the North Sea, causing a

  11. Enhanced Open Ocean Storage of CO2 from Shelf Sea Pumping

    NARCIS (Netherlands)

    Thomas, H.; Bozec, Y.; Elkalay, K.; de Baar, H.J.W.

    2004-01-01

    Seasonal field observations show that the North Sea, a Northern European shelf sea, is highly efficient in pumping carbon dioxide fromthe atmosphere to the North Atlantic Ocean. The bottom topography–controlled stratification separates production and respiration processes in the North Sea, causing a

  12. Passive Capillary Pumped Cryocooling System for Zero-Boil-Off Cryogen Storage Tanks Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Significant cost and weight savings of a space mission can be achieved by improving the cryogenic storage technology. Added cryogen mass due to the cryogen boil-off,...

  13. Solar powered absorption cycle heat pump using phase change materials for energy storage

    Science.gov (United States)

    Middleton, R. L.

    1972-01-01

    Solar powered heating and cooling system with possible application to residential homes is described. Operating principles of system are defined and illustration of typical energy storage and exchange system is provided.

  14. Adsorption properties of porous materials for solar thermal energy storage and heat pump applications

    OpenAIRE

    Jänchen, Jochen; Stach, Helmut

    2012-01-01

    The water adsorption properties of modified porous sorbents for solar thermal energy storage and heat transformation have been investigated by thermogravimetry (TG) differential thermogravimetry (DTG), microcalorimetry, measurements of water adsorption isotherms, and storage tests. A chabazite type SAPO, a dealuminated faujasite type zeolite, and a mesostructured aluminosilicate, have been synthesized and compared with common zeolites X, Y and silica gel. It has been found that optimized latt...

  15. Optimal bidding in Turkey day ahead electricity market for wind energy and pumped storage hydro power plant

    Directory of Open Access Journals (Sweden)

    Ceyhun Yıldız

    2016-10-01

    Full Text Available In electrical grid; when the demand power increases energy prices increase, when the demand decreases energy prices decrease. For this reason; to increase the total daily income, it is required to shift generations to the hours that high demand power values occurred. Wind Power Plants (WPP have unstable and uncontrollable generation characteristic. For this reason, energy storage systems are needed to shift the generations of WPPs in time scale. In this study, four wind power plants (WPP which are tied to the Turkish interconnected grid and a pumped hydro storage power plant (PSPP that meets the energy storage requirement of these power plants are investigated in Turkey day ahead energy market. An optimization algorithm is developed using linear programming technique to maximize the day ahead market bids of these plants which are going to generate power together. When incomes and generations of the plants that are operated with optimization strategy is analyzed, it is seen that annual income increased by 2.737% compared with WPPs ‘s alone operation and generations are substantially shifted to the high demand power occurred hours.

  16. Electrochemical Separation, Pumping, and Storage of Hydrogen or Oxygen into Nanocapillaries Via High Pressure MEA Seals

    Science.gov (United States)

    2015-10-13

    to improve pumping rate, membrane sealing, and catalytic performance. Funding U.S. Air Force SBIR - Edwards AFB (FA9302-13-C-0030) Chemical...with a membrane electrode assembly (MEA). Hoop stress calculations show that the pressure tolerances of cylinders are inversely proportional to the... membrane (AEM) complete with catalyst nanoparticles on either side of the membrane to form an MEA. This MEA is used to provide controllable electrochemical

  17. Pumped storage hydropower plants in tomorrow's energy mix. A legal classification; Pumpspeicherkraftwerke im Energiemix der Zukunft. Eine rechtliche Einordnung

    Energy Technology Data Exchange (ETDEWEB)

    Bachmann, Peter; Erling, Uwe M. [Noerr LLP, Muenchen (Germany)

    2012-06-15

    The continuing expansion of renewable energies has brought storage technologies into the focus of interest, since these are indispensable if the demand for energy is to be covered solely from volatile resources. Pumped storage hydropower plants are predestined for this task because they can be deployed in a targeted, flexible manner without interruptions of operation. A legal assessment of these power plants with regard to recent developments shows in particular that the investment incentives created to date deserve a critical view.

  18. Economic Viability of Pumped-Storage Power Plants Equipped with Ternary Units and Considering Hydraulic Short-Circuit Operation

    Science.gov (United States)

    Chazarra, Manuel; Pérez-Díaz, Juan I.; García-González, Javier

    2017-04-01

    This paper analyses the economic viability of pumped-storage hydropower plants equipped with ternary units and considering hydraulic short-circuit operation. The analysed plant is assumed to participate in the day-ahead energy market and in the secondary regulation service of the Spanish power system. A deterministic day-ahead energy and reserve scheduling model is used to estimate the maximum theoretical income of the plant assuming perfect information of the next day prices and the residual demand curves of the secondary regulation reserve market. Results show that the pay-back periods with and without the hydraulic short-circuit operation are significantly lower than their expected lifetime and that the pay-back periods can be reduced with the inclusion of the hydraulic short-circuit operation.

  19. Risk-constrained dynamic self-scheduling of a pumped-storage plant in the energy and ancillary service markets

    Energy Technology Data Exchange (ETDEWEB)

    Kazempour, S. Jalal; Moghaddam, M. Parsa; Haghifam, M.R.; Yousefi, G.R. [Department of Electrical Engineering, Tarbiat Modares University (TMU), Tehran (Iran)

    2009-05-15

    This work addresses a new framework for self-scheduling of an individual price-taker pumped-storage plant in a day-ahead (DA) market. The goal is achieving the best trade-off between the expected profit and the risks when the plant participates in DA energy, spinning reserve and regulation markets. In this paper, a set of uncertainties including price forecasting errors and also the uncertainty of power delivery requests in the ancillary service markets are contemplated. Considering these uncertainties, a new approach is proposed which is called dynamic self-scheduling (DSS). This risk-constrained dynamic self-scheduling problem is therefore formulated and solved as a mixed integer programming (MIP) problem. Numerical results for a case study are discussed. (author)

  20. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 5: Site selection

    Science.gov (United States)

    1981-04-01

    A six-step site selection process undertaken to identify and subsequently rank potential sites suitable for either an underground pumped hydroelectric (UPH) facility, or a water-compensated hard-rock cavern compressed air energy storage (CAES) facility is described. The region of study was confined to the service area of the Potomac Electric Power Company (PEPCO) and contiguous areas. Overriding considerations related to geology, environmental impact and transmission-line routing were studies within the context of minimizing plant costs. The selection process led to the identification of several sites suitable for the development of either a CAES or an UPH facility. Design development and site exploration at the selected site are described.

  1. Prediction versus actual response of rocks in an excavation of underground cavern at the Lam Ta Khong pumped storage project

    Energy Technology Data Exchange (ETDEWEB)

    Lertsgoon, P.N. [Electricity Generating Authority of Thailand, Bangkruai Nonthaburi (Thailand)

    2003-07-01

    The Lam Ta Khong Pumped Storage Project represents the first underground power plant in Thailand, and involves the excavation of a large underground cavern. Its dimensions are a 25 span, 175 metres long and 49 metres high. It is excavated in sandstone and siltstone and houses 4 power generator units capable of producing a maximum of 1000 mega watts (MW). The work was completed in 2000. The feasibility study revealed questionable properties of the siltstone which governs the ceiling of the cavern, due to a slacking phenomenon. A comparison between prediction and actual ground responses during excavation was performed for construction safety. PHASES and PHASE2 software were used for the prediction, while the actual rock response was obtained using a monitoring system. The parameters on rock properties from back calculation used in the design were made obvious by the correspondence between the prediction and the actual responses. 2 refs., 1 tab., 5 figs.

  2. Swiss pumped hydro storage potential for Germany's electricity system under high penetration of intermittent renewable energy

    NARCIS (Netherlands)

    van Meerwijk, Aagje J. H.; Davila-Martinez, Alejandro; Laugs, Gideon A. H.

    2016-01-01

    In order to cut greenhouse-gas emissions and increase energy security, the European Commission stimulates the deployment of intermittent renewable energy sources (IRES) towards 2050. In an electricity system with high shares of IRES implemented in the network, energy balancing like storage is needed

  3. Swiss pumped hydro storage potential for Germany's electricity system under high penetration of intermittent renewable energy

    NARCIS (Netherlands)

    van Meerwijk, Aagje J. H.; Davila-Martinez, Alejandro; Laugs, Gideon A. H.

    2016-01-01

    In order to cut greenhouse-gas emissions and increase energy security, the European Commission stimulates the deployment of intermittent renewable energy sources (IRES) towards 2050. In an electricity system with high shares of IRES implemented in the network, energy balancing like storage is needed

  4. Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

    Science.gov (United States)

    Pujades, Estanislao; Willems, Thibault; Bodeux, Sarah; Orban, Philippe; Dassargues, Alain

    2016-09-01

    Underground pumped storage hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants.

  5. Smart intermittency-friendly cogeneration: Techno-economic performance of innovative double storage concept for integrating compression heat pumps in distributed cogeneration

    DEFF Research Database (Denmark)

    Blarke, Morten

    2011-01-01

    recovered from flue gasses as the only low-temperature heat source, furthermore applying an intermediate cold storage allowing for non-concurrent operation of heat pump and cogeneration unit. The novel concept is subject to a detailed techno-economic comparative modelling and analysis, hich finds...

  6. High efficient heat pump system using storage tanks to increase COP by means of the ISEC concept - Part 1: Model validation

    DEFF Research Database (Denmark)

    Rothuizen, Erasmus; Elmegaard, Brian; Markussen, Wiebke B.

    2015-01-01

    The purpose of the ISEC concept is to provide a high-efficient heat pump system for hot water production.The ISEC concept uses two storage tanks for the water, one discharged and one charged. Hot water for theindustrial process is tapped from the charged tank, while the other tank is charging....... Charging is done bycirculating the water in the tank through the condenser of a heat pump several times and thereby graduallyheating the water. The charging is done with a higher mass flow rate than the discharging to reach severalcirculations of the water during the time frame of one discharging....... This result in a lower condensingtemperature than if the water was heated in one step. Two test setups were built, one to test the performanceof the heat pump gradually heating the water and one to investigate the stratification in the storage tanks.Furthermore, a dynamic model of the system was implemented...

  7. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 11: Plant design. UPH

    Science.gov (United States)

    1981-06-01

    The plant design for an underground pumped hydroelectric (UPH) storage facility having maximum generating capacity of 2000 MW and energy storage capacity of 20,000 MWh at a nominal heat of 5000 ft. is presented. The UPH facility is a two step configuration with single-stage reversible pump-turbines, each step consisting of a 1000 MW plant at a nominal head of 2500 ft. The surface facilities and upper reservoir, shafts and hoists, penstocks and hydraulic tunnels, powerhouses, and intermediate and lower reservoirs are described. Details of the power plant electrical and mechanical equipment, including pump-turbine and motor-generator units, are given. The development of the site is outlined together with the construction methods and schedule. The cost estimates and a cost-risk analysis are presented. Plant operation, including unit operation, two-step operation, plant efficiency, and availability, is outlined.

  8. 西北地区抽水蓄能发展研究%Research on Development of Pumped-Storage Hydropower in Northwest of China

    Institute of Scientific and Technical Information of China (English)

    贾德香; 程路

    2012-01-01

    With the large-scale development of wind power in Northwest China, the feasibility for building pumped-storage plants in this area needs to be studied to facilitate the effective consumption of wind power. The principle and method for planning pumped-storage plants are proposed. Considering the traditional hydropower development and the planned sites of pumped-storage plants, with the aim of minimum total social cost of the power supply, and with multiple factors such as the effective consumption of wind power and the balance of power and energy as constraints, the paper proposes a rational and feasible development scale and the distribution of pumped-storage plants in Northwest China, which can provide a reference for the formulation of development planning and management measures of pumped-storage power stations for the northwest grid.%面对我国西北地区未来风电大规模开发趋势,需要深入研究西北地区建设抽水蓄能电站的可行性,以便促进风电有效消纳.提出了抽水蓄能电站发展研究的思路、原则和方法,结合常规水电开发和抽蓄电站选点,以全社会电力供应总成本最低为目标,以清洁能源有效消纳和电力电量平衡等多种因素为约束条件,提出了西北地区抽水蓄能电站的合理可行的开发规模、布局,为西北电网制定抽水蓄能发展规划和管理措施提供参考.

  9. 风电场中抽水蓄能电站的优化配置%The optimal allocation of pumped storage station in wind farm

    Institute of Scientific and Technical Information of China (English)

    任增; 邱晓燕; 林伟; 江东林; 王松; 魏宏芬

    2012-01-01

    为解决电力系统接入风电容量超过一定比例后引起的调峰及弃风问题,改善风电场功率输出特性,可采用与风电场配套建设抽水蓄能电站的模式.在建立风电场及抽水蓄能电站运行模型的基础上,以风电—抽水蓄能电站经济效益为目标,采用一种新的自适应遗传算法对风电—抽水蓄能电站的最佳容量配比进行求解.通过对一实际算例的仿真,表明配置适当容量的抽水蓄能电站可提高风电场的综合效益.%To solve the peak shaving and the abandoning problems caused by the wind generation installed capacity which is more than certain percentage,and to improve the output characteristics of wind power,the mode of constructing a pumped storage power station supported by wind farm can be adopted.This paper is based on modeling the wind farm and pumped storage power station operation, targets at the hybrid wind power and pumped hydro storage systems economic benefitsA new adaptive genetic algorithm is adopted to solve the best capacity ratio of pumped storage power station to wind generation.Finally,a practical example simulation result shows the combined revenues of wind farm can be improved by the proper capacity allocation of pumped storage power station.

  10. Preliminary design study of Underground Pumped Hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches. UPH, Appendix D: Power plant

    Science.gov (United States)

    1981-06-01

    Studies were undertaken to determine power plant arrangements for a single stage reversible pump turbine two step underground pumped hydro (UPH) installation and for a multi-stage reversible pump turbine single step (MSRPT) UPH installation. Arrangements consist of: the underground powerhouses; transformer galleries; associated mechanical and electrical equipment; the administration and control building; hoist head frames; the access; draft tube and bus tunnels; and the switchyard. Primary considerations including the number and size of pump turbine and motor generator units, starting methods, transformers, high voltage connections, geotechnical and construction aspects and safety were studied. A feasibility analysis to minimize costs was conducted. The study led to the selection of suitable equipment and layouts for the powerhouses, transformer galleries, and associated facilities. The material presented and also the cost estimates are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage with a nominal head of 4600 ft.

  11. Performance analysis of a soil-based thermal energy storage system using solar-driven air-source heat pump for Danish buildings sector

    DEFF Research Database (Denmark)

    Jradi, M.; Veje, C.; Jørgensen, B. N.

    2017-01-01

    source. Employing a PV system of 30 kW capacity, it was found that a storage medium of 900 m3 of soil is capable of providing the heating needs for a housing project of 1000 m2 internal floor area. The year round transient behaviour of the thermal energy storage medium is reported in addition to the heat...... and evaluation of the performance of an underground soil-based thermal energy storage system for solar energy storage, coupled with a combined heat and power generation system. A combined PV-Air Source Heat Pump (ASHP) system is utilized to fulfil heating and electricity needs of a housing project in Odense.......2% for the combined PV-ASHP system employing a seasonal underground thermal energy storage block....

  12. ANALYSIS ON THE ECONOMY OF THE THERMODYNAMIC PUMPED STORAGE POWER GENERATION%火力抽水—蓄能发电的经济性分析

    Institute of Scientific and Technical Information of China (English)

    盛建伦

    2001-01-01

    火力抽水—蓄能发电是由汽轮机直接带动水泵抽水蓄能发电。文中分析了火力抽水—蓄能发电的发电效率、投资效益以及技术上的可行性。与传统的抽水蓄能发电相比,火力抽水—蓄能发电减少了2次能量转换的损失和1次电能传输的损失,总的发电效率可提高10%以上。其运行方式是全天24h抽水,电网峰负荷时发电。锅炉、汽轮机都可以满负荷工作,得到最高的热效率。用火力抽水—蓄能发电厂取代同样规模的火电厂和抽水蓄能电站,可以提高发电效率,降低供电煤耗率,增加发电量,降低设备投资。%The power generation efficiency, investment benefit and technicalfeasibility of the thermodynamic pumped storage are analyzed. The thermodynamic pumped storage system is not using electricity, but using the steam turbine to pump water, directly converting heat energy to potential energy for storing energy and then generating power. Because the energy losses in twice energy converting processes and a transmission process are avoided, the efficiency may improve more than 10%. The running mode of thermodynamic pumped storage power generation is pumping in 24 h, generating in peak hours. The boiler, the steam turbine and the pump work in rated capacity, thus all getting the highest electric generation efficiency. The advantages of using a thermodynamic pumped storage power plant to replace a pumped storage power station and a fossil fuel power plant in same capacity are higher efficiency, less construction investment, more electric energy generation and less coal consumption rate.

  13. LDV measurements of the velocity field on the inlet section of a pumped storage equipped with a symmetrical suction elbow for variable discharge values

    Science.gov (United States)

    ǎghici, I., Dr; Muntean, S.; Bosioc, A. I.; Anton, L. E.

    2014-03-01

    The storage pumps are equipped with various types of inlet casings. The flow nonuniformity is generated by the suction elbows being ingested by the impeller leading to unsteady phenomena and worse cavitational behaviour. A symmetrical suction elbow model corresponding to the double flux storage pump was manufactured and installed on the test rig in order to assess the flow field at the pump inlet. The experimental investigations are performed for 9 discharge values from 0.5 to 1.3 of nominal discharge. LDV measurements are performed on the annular section of the pump inlet in order to quantify the flow non-uniformity generated by the symmetrical suction elbow. Both axial and circumferential velocity components are simultaneously measured on the half plane (180°) of the annular inlet section along to 19 survey axis with 62 points on each. The flow field on the next half plane is determined tacking into account the symmetry. As a result, the flow map on the pump inlet annular section is reconstructed revealing a significant variation of the circumferential velocity component. The absolute flow angle is computed showing a significant variation of ±38°.

  14. Modeling of temperature and turbidity in a natural lake and a reservoir connected by pumped-storage operations

    Science.gov (United States)

    Bonalumi, Matteo; Anselmetti, Flavio S.; Wüest, Alfred; Schmid, Martin

    2012-08-01

    Pumped-storage (PS) systems are used to store electric energy as potential energy for release during peak demand. We investigate the impacts of a planned 1000 MW PS scheme connecting Lago Bianco with Lago di Poschiavo (Switzerland) on temperature and particle mass concentration in both basins. The upper (turbid) basin is a reservoir receiving large amounts of fine particles from the partially glaciated watershed, while the lower basin is a much clearer natural lake. Stratification, temperature and particle concentrations in the two basins were simulated with and without PS for four different hydrological conditions and 27 years of meteorological forcing using the software CE-QUAL-W2. The simulations showed that the PS operations lead to an increase in temperature in both basins during most of the year. The increase is most pronounced (up to 4°C) in the upper hypolimnion of the natural lake toward the end of summer stratification and is partially due to frictional losses in the penstocks, pumps and turbines. The remainder of the warming is from intense coupling to the atmosphere while water resides in the shallower upper reservoir. These impacts are most pronounced during warm and dry years, when the upper reservoir is strongly heated and the effects are least concealed by floods. The exchange of water between the two basins relocates particles from the upper reservoir to the lower lake, where they accumulate during summer in the upper hypolimnion (10 to 20 mg L-1) but also to some extent decrease light availability in the trophic surface layer.

  15. Analysis of Pumped Storage Plants (PSP) viability associated with other types of intermittent renewable energy

    Science.gov (United States)

    Andrade, J. G. P.; Barbosa, P. S. F.; Luvizotto, E., Jr.; Zuculin, S.; Pinto, Marrc; Tiago Filho, G. L.

    2014-03-01

    The energy generated by wind or solar photovoltaic (PV system) can be used by PSP to accumulate water in the upper reservoir, in the form of potential energy to be used later, during periods of high energy demand. This procedure offers the advantage of enabling the use of intermittent renewable energy source in times of growing needs of the electric power supply. The location of the PSP, the environmental aspects involved, their possible use for various purposes (stability of the power system at peak times, associate the turbine water for public supply purposes, among others) and the discussion of regulatory issues needs to be debated in the current context, where environmental issues require reliable sources of power generation and demand shows strong growth rates. A dynamic model is used to analyze the behavior of a PSP proposal for a site in Brazil, analyzing a complete cycle of its operation as a pump or turbine. The existing difficulties to use this proposal based on existing regulatory policies are also discussed, and a list of recommended adjustments is provided to allow the penetrations of PSP projects in the Brazilian institutional framework, coupled with other intermittent energy sources.

  16. Analysis of the flow field into a two stages and double entry storage pump taking into account two geometries of stator blades

    Science.gov (United States)

    Dunca, G.; Muntean, S.; Isbasoiu, E. C.

    2010-08-01

    The paper presents the 3D numerical analysis of the flow into a hydraulic passage of the two stages and double entry storage pump. One of the reasons for choosing this machinery was that, even from the beginning of its operation, high levels of noise and vibration were recorded. According to the literature, these can be considered as effects of the impeller-stator phenomenon. After only 100 hours of operation, the pump' first stator blades was bend and the second stator blades was broken. As a rehabilitation solution, 100 mm of the chord were cut from the stator blades, near the leading edge. After the rehabilitation, a decrease of the noise and vibration levels during pump operation was observed. In order to analyse the pump behaviour, three measurements campaigns were conducted, after the rehabilitation. Yet, the experimental results were not very conclusive. A more detailed experimental analysis on a real turbo machine is very difficult and expensive. Thus, in order to obtain more detailed information regarding the impeller-stator phenomenon inside the analysed pump, a numerical analysis was realized. The impeller-stator (between the first impeller and first stator as well as between second impeller and second stator) and stator-impeller (between the first stator and second impeller) interactions are taken into account with mixing interface method. The hydrodynamic field from the inlet to the outlet is obtained. As a result, the pressure rise and hydraulic efficiency are computed at best efficiency point. These values are validated against experimental data measured into the storage pump. Comparing the numerical results obtained for the two geometries of the stators, it can be seen that they have different behaviour during the pump's operation. It can be considered that, although the same geometry modification was realized for both the stators, the effects on the flow parameters are different, only for the second stator being possible to observe a net

  17. Off-stream Pumped Storage Hydropower plant to increase renewable energy penetration in Santiago Island, Cape Verde

    Science.gov (United States)

    Barreira, Inês; Gueifão, Carlos; Ferreira de Jesus, J.

    2017-04-01

    In order to reduce the high dependence on imported fuels and to meet the ongoing growth of electricity demand, Cape Verde government set the goal to increase renewable energy penetration in Santiago Island until 2020. To help maximize renewable energy penetration, an off-stream Pumped Storage Hydropower (PSH) plant will be installed in Santiago, in one of the following locations: Chã Gonçalves, Mato Sancho and Ribeira dos Picos. This paper summarizes the studies carried out to find the optimal location and connection point of the PSH plant in Santiago’s electricity network. This goal was achieved by assessing the impact of the PSH plant, in each location, on power system stability. The simulation tool PSS/E of Siemens was used to study the steady-state and dynamic behavior of the future (2020) Santiago MV grid. Different scenarios of demand and renewable resources were created. Each hydro unit of the PSH plant was modeled as an adjustable speed reversible turbine employing a DFIM. The results show that Santiago’s grid with the PSH plant in Chã Gonçalves is the one that has the best performance.

  18. International Conference on Underground Pumped Hydro and Compressed Air Energy Storage, San Francisco, CA, September 20-22, 1982, Collection of Technical Papers

    Science.gov (United States)

    1982-08-01

    Topics discussed include an assessment of the market potential of compressed air energy storage (CAES) systems, turbocompressor considerations in CAES plants, subsurface geological considerations in siting an underground pumped hydro (UPH) project, and the preliminary assessment of waste heat recovery system for CAES plants. Also considered are CAES caverns design for leakage, simulation of the champagne effect in CAES plants, design of wells and piping for an aquifer CAES plant, various aspects of the Huntor CAES facility, low-pressure CAES, subsurface instrumentation plan for the Pittsfield CAES field test facility, and the feasibility of UPH storage in the Netherlands.

  19. Development and Implications of a Predictive Cost Methodology for Modular Pumped Storage Hydropower (m-PSH) Projects in the United States

    Energy Technology Data Exchange (ETDEWEB)

    Witt, Adam [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chalise, Dol Raj [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Hadjerioua, Boualem [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Manwaring, Michael [MWH, Broomfield, CO (United States); Bishop, Norm [Knight Piesold, Denver, CO (United States)

    2016-10-01

    The slow pace of Pumped Storage Hydropower development in the US over the past twenty years has led to widespread interest in the feasibility and viability of alternative PSH designs, development schemes, and technologies. Since 2011, Oak Ridge National Lab has been exploring the economic viability of modular Pumped Storage Hydropower (m-PSH) development through targeted case studies, revenue simulations, and analysis of innovative configurations and designs. This paper outlines the development and supporting analysis of a scalable, comprehensive cost modeling tool designed to simulate the initial capital costs for a variety of potential m-PSH projects and deployment scenarios. The tool is used to explore and determine innovative research strategies that can improve the economic viability of m-PSH in US markets.

  20. Hydropower pump storage - AC- excitation using ANPC technology; AC-Erregung mit ANPC-Stromrichtertechnologie. Einsatz von ANPC-Stromrichten fuer Pumpspeicherwerke

    Energy Technology Data Exchange (ETDEWEB)

    Haemmerli, A.; Odegard, B. [ABB Schweiz AG, Turgi (Switzerland)

    2010-07-01

    This article takes a look at the use of Active Neutral Point Clamped (ANPC) technology in power converters used for the control of pump/generators as used in hydropower installations. The functioning of the electronics of such converters and their operation are discussed in detail. As an example, the authors also discusses the use of such technology in a pump-storage hydropower facility in Slovenia. The limited frequency variability made available by the ANPC technology is discussed for the optimal operation of the turbines. The electronics also make it possible to optimise the operation in pump mode too: Here, the authors state that the optimal speed is somewhat higher than mains frequency.

  1. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 6: Site investigation: Shallow drilling

    Science.gov (United States)

    1981-04-01

    The work was undertaken to define the surficial geological conditions and the nature of the overburden and the bedrock at shallow depths as part of the field exploration program for underground pumped hydro (UPH) and compressed air energy storage (CAES) facility. Testing was performed on selected rock and soil samples to define the physical and mechanical properties of the subsurface material. Piezometers were installed on the site for long term monitoring of the groundwater.

  2. 抽水蓄能的开发模式与电力的发展%The development modes of pumped storage power plant and the power development

    Institute of Scientific and Technical Information of China (English)

    曹楚生

    2001-01-01

    The hydropower is a clean and renewable energy resources. China is rich in hydropower resources. Because of the unbalance of resource deployment and economic development and the needs of peaking and valley filling of power network, it is imperative for China to develop pumped-storage power plant. In order to give full play to the benefits of pumped-storage power plant, improve the quality of power supply and help the sustainable development of power system, the adoption of combined development way of pumped-storage power plant, thermal power plant, nuclear power plant, wind power plant and conventional hydropower station is, after all, a good development way.%水电是清洁可再生能源,我国是水能资源丰富的国家,但由于资源配置和经济发展的不平衡及电网调峰填谷等需要,发展抽水蓄能电站已势在必行。为更好地发挥抽水蓄能电站的效益,改善供电质量,有利于电力系统的可持续发展,采用抽水蓄能电站与火电、核电、风电厂或常规水电站联合开发的模式不失为一种好的模式。

  3. Heat pump technology

    CERN Document Server

    Von Cube, Hans Ludwig; Goodall, E G A

    2013-01-01

    Heat Pump Technology discusses the history, underlying concepts, usage, and advancements in the use of heat pumps. The book covers topics such as the applications and types of heat pumps; thermodynamic principles involved in heat pumps such as internal energy, enthalpy, and exergy; and natural heat sources and energy storage. Also discussed are topics such as the importance of the heat pump in the energy industry; heat pump designs and systems; the development of heat pumps over time; and examples of practical everyday uses of heat pumps. The text is recommended for those who would like to kno

  4. Tonoplast lipid composition and proton pump of pineapple fruit during low-temperature storage and blackheart development.

    Science.gov (United States)

    Zhou, Yuchan; Pan, Xiaoping; Qu, Hongxia; Underhill, Steven J R

    2014-05-01

    Vacuole represents a major storage organelle playing vital roles in pH homoeostasis and cellular detoxification. The chemical and functional properties of tonoplast in response to chilling temperature and their roles in chilling injury are largely unknown. In the current study, lipid composition of tonoplast and the activities of two vacuolar proton pumps, H?-ATPase (V-ATPase) and H?-pyrophosphatase (V-PPase), were investigated in accordance with the development of blackheart, a form of chilling injury in pineapple fruit (Ananas comosus). Chilling temperature at 10 °C for 1 week induced irreversible blackheart injury in concurrence with a substantial decrease in V-ATPase activity. By contrast, the activity was increased after 1 week at 25 °C. The activity of V-PPase was not changed under both temperatures. Level of total phospholipids of tonoplast decreased at 10 °C, but increased at 25 °C. There was no change at the level of total glycolipids under both temperatures. Thus, low temperature increased the ratio of total glycolipids vs. total phospholipids of tonoplast. Phosphatidylcholine and phosphatidylethanolamine were the predominant phospholipids of tonoplast. Low temperature increased the relative level of phosphatidic acid but decreased the percentage of both phosphatidylcholine and phosphatidylethanolamine. Unsaturated fatty acids accounted for over 60 % of the total tonoplast fatty acids, with C18:1 and C18:2 being predominant. Low temperature significantly decreased the percentage of C18:3. Modification of membrane lipid composition and its effect on the functional property of tonoplast at low temperature were discussed in correlation with their roles in the development of chilling injury in pineapple fruit.

  5. Feasibility study for the partial conversion of a hydropower plant into a pumped-storage power plant: a case study of hydroelectric power plant La Barca (Asturias, Spain

    Directory of Open Access Journals (Sweden)

    E. Antuña Yudego

    2017-01-01

    Full Text Available Renewable energy sources have reported an unprecedented increase of global installed renewable power capacity. Against the advantages provided by this renewable power generation technology it should be taken into account an important issue: these intermittent energy sources supply a fluctuating output which is difficult to manage. Pumped-storage hydro power plants reappear in these circumstances as an efficient form of energy storage which allows to use reserves when necessary, enabling power generation output to cover continuously this energy demand. The present paper shows a simplified feasibility study of the partial conversion of hydropower plant La Barca, in Asturias, into a reversible storage through the development of an algorithm to simulate its operation according to electricity market prices. For this purpose, the operation in the deviation management market is considered and the technical modifications required for the conversion are shown. The estimation of costs and incomes present a feasible scenario.

  6. Evaluation of advanced hydraulic turbomachinery for underground pumped hydroelectric storage. Part 2. Two-stage regulated pump/turbines for operating heads of 1000 to 1500 m

    Energy Technology Data Exchange (ETDEWEB)

    Blomquist, C.A.; Frigo, A.A.; Degnan, J.R.

    1979-10-01

    This UPHS report applies to Francis-type, reversible pump/turbines regulated with gating systems. The first report, however, covered single-stage regulations; this report covers two-stage regulations. Development of a two-stage regulated pump/turbine appears to be attractive because the proposed single-drop UPHS concept requires turbomachinery with a head range of 1000 to 2000 m. With turbomachinery of this range available, the single-drop scheme offers a simple and economic UPHS option. Six different two-stage, top-gated pump/turbines have been analyzed: three that generate 500 MW and three that generate 350 MW. In each capacity, one machine has an operating head of 1000 m, another has a head of 1250 m, and the third has a head of 1500 m. The rated efficiencies of the machines vary from about 90% (1000-m head) to about 88% (1500-m head). Costs in 1978 $/kW for the three 500-MW units are: 20.5 (1000 m), 16.5 (1250 m), and 13.5 (1500 m). Corresponding costs for the three 350-MW units are 23, 18, and 14 $/kW. No major turbomachinery obstacles are foreseen that could hamper development of these pump/turbines. Further model testing and development are needed before building them.

  7. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 2: Project design criteria: UPH

    Science.gov (United States)

    1981-05-01

    The design criteria for an underground pumped hydroelectric (JPH) storage facility having a maximum generating capacity of 2000 MW and a storage capacity of 20,000 MWh at a nominal head of 5000 ft are documented. The UPH facility is a two step configuration with single stage reversible pump turbines, each step consisting of a 1000 MW plant at a nominal head of 2500 ft. Overall design criteria including operating requirements, civil/structural criteria, geotechnical criteria, mechanical criteria and electrical criteria are detailed. Specific requirements are given for the upper reservoir, intake/outlet structure, penstock and draft tubes, powerhouses, transformer galleries, intermediate reservoir, lower reservoir, shafts and hoists, switchyard and surface buildings. The requirements for the power plant electrical and mechanical equipment, including pump turbine and motor generator units, are referred to. Electrical design criteria are given to meet the requirements of two power houses located underground at different depths, but these criteria may not necessarily reflect PEPCO's current engineering practice. The criteria refer to a specific site and take into account the site investigation results. The design criteria given were used as the basis for the plant design.

  8. Energy Optimization for Transcritical CO2 Heat Pump for Combined Heating and Cooling and Thermal Storage Applications

    DEFF Research Database (Denmark)

    Do Carmo, Carolina Madeira Ramos; Blarke, Morten; Yazawa, Kazuaki

    2012-01-01

    A transcritical heat pump (THP) cycle using carbon dioxide (CO2) as the refrigerant is known to feature an excellent coefficient of performance (COP) as a thermodynamic system. Using this feature, we are designing and building a system that combines a water-to-water CO2 heat pump with both hot an...

  9. Development of PFAS-heat storage type air conditioning system with individual heat pump. Chikunetsushiki kobetsu hito ponpu kucho system 'PFAS' no kaihatsu

    Energy Technology Data Exchange (ETDEWEB)

    Okubo, S. (Tokyo Electric Power Co., Inc. (Japan)); Seki, Y. (Takasago Thermal Engineering Co. Ltd., Tokyo (Japan)); Igarashi, M. (Nippon P-MAC Co. Ltd., Tokyo (Japan))

    1993-12-05

    With various uses of building, a good air conditioning system with individual control is needed. Meanwhile, the maximum electric power during summer days is increasing year by year, equalization of electricity load consumed by air conditioning system becomes an important subject in the aspect of stable supply of energy. For meeting these requirements, authors developed a system of the PMAC fancoil air conditioning and heat storage system (PFAS) which provides with a distributed individual type hydrothermal source air conditioner and a heat storage system. This paper introduced a summary of the PFAS system and some operating examples. This system was constructed by the air conditioning unit of combining a hydrothermal source unitary heat pump with a fancoil, a machine of a heat source such as an air cooling heat pump, a heat storage tank and a control system, and it realized equalization of electricity load consumed and saving the running cost of the air conditioning system owing to the night electric use. 8 refs.

  10. Integrated subsurface water solutions for coastal environments through integrated pump&treat and aquifer storage and recovery (ASR) schemes

    Science.gov (United States)

    Perdikaki, Martha; Kallioras, Andreas; Christoforidis, Christophoros; Iossifidis, Dimitris; Zafeiropoulos, Anastasios; Dimitriadis, Klisthenis; Makropoulos, Christos; Raat, Klaasjan; van den Berg, Gerard

    2016-04-01

    Coastal wetlands in semi-arid regions, as in Circum-Mediterranean, are considered important ecosystems that provide valuable services to human population and the environment, such as: flood protection, erosion control, wildlife habitat, water quality, recreation and carbon sequestration. Un-managed surface and groundwater exploitation in these areas usually leads to deterioration of such sensitive ecosystems by means of water resources degradation and/or increased salinity. Groundwater usually plays a vital role for the sustainability of these hydrological systems, as the underlying aquifers operate as regulators for both quantity and quality of their waters. Multi-layer and multi-objective Managed Aquifer Recharge (MAR) systems can be proved effective groundwater engineered solutions for the restoration of deteriorated coastal wetlands in semi- and arid regions. The plain of Marathon is a typical Mediterranean environment that hosts a naturally occurring -and today degraded- coastal wetland with the characteristics of a distinct ecosystem linked to a typical coastal hydrogeological system of a semi-arid region; and therefore can serve as a model for similar systems world-wide. The geo-hydrological setting of the area involves a multi-layer aquifer system consisting of (i) an upper un-consolidated formation of depositional unit dominated mostly by fluvial sediments and (ii) the surrounding and underlying karstified marbles; both being linked to the investigated wetland and also subjected to seawater encroachment. A smart engineered MAR system via an optimised Pump & Treat system integrated with an Aquifer Storage and Recovery (ASR) scheme in this area would include the abstraction of brackish groundwater from the deeper karst aquifer at a location close to the shoreline and direct treatment with Reverse Osmosis (RO). for desalination. Two-fold re-use scheme of the purified effluent can then be engineered for (i) the restoration of the coastal wetland; and (ii

  11. Smart intermittency-friendly cogeneration: Techno-economic performance of innovative double storage concept for integrating compression heat pumps in distributed cogeneration

    DEFF Research Database (Denmark)

    Blarke, Morten

    2011-01-01

    cogeneration plants rather than central power plants are giving way for wind power in the electricity mix. Could intermittent renewables be a threat to the system-wide energy, economic and environmental benefits that distributed cogeneration have to offer? This paper investigates how existing cogeneration...... plants may adapt their plant design and operational strategy to improve the co-existence between cogeneration and intermittent renewables. A novel intermittency-friendly and super-efficient concept in cogeneration is presented that involves integrating a high-pressure compression heat pump using heat...... recovered from flue gasses as the only low-temperature heat source, furthermore applying an intermediate cold storage allowing for non-concurrent operation of heat pump and cogeneration unit. The novel concept is subject to a detailed techno-economic comparative modelling and analysis, hich finds...

  12. Continuous on-line calculation of permissible load change in a pumped storage power plant; Kontinuierliche On-Line Berechnung der zulaessigen Lastaenderung in einem Pumpspeicherwerk

    Energy Technology Data Exchange (ETDEWEB)

    Feyrer, R.

    1994-12-31

    A preliminary simulator establishes the maximum possible load change in a pumped storage power plant. The complex hydraulic system of such power plants renders controlling of their operation difficult. The preliminary simulator continuously determines the maximum permissible turbine output and number of pumps at each instance, thereby facilitating power plant operation control. This simulator is installed at the Witznau power plant and is currently undergoing intense testing. It will be integrated into the new process control system installed in 1994. (orig.) [Deutsch] Der Vorabsimulator ermittelt die maximal moegliche Lastaenderung in einem Pumpspeicherwerk. Das komplizierte Wasserfuehrungsystem des Pumpspeicherwerks erschwert die Betriebsfuehrung. Der Vorabsimulator bestimmt kontinuierlich die momentan maximal zulaessige Turbinenleistung und Pumpenanzahl, und erleichtert damit die Betriebsfuehrung des Kraftwerks. Der Vorabsimulator ist im Kraftwerk Witznau installiert und wird derzeit intensiv getestet. Eine Einbindung in die neue Leittechnik, die 1994 installiert wird, ist vorgesehen. (orig.)

  13. Model and operation strategy of pumped-storage in hybrid power system%多能互补发电系统抽水蓄能模型及运行策略

    Institute of Scientific and Technical Information of China (English)

    任岩; 郑源; 周兵; 郭齐珂

    2013-01-01

    Based on the characteristics of hybrid power system, a mathematical model of pumped-storage was established. According to its function, the pumped-storage operation strategy was put forward, that is, to operate as per given load and specifically in the hybrid wind-PV-pumped-storage system, to operate as per net load. A control model of pumped-storage was accordingly proposed; as the net load was greater than zero, the pumped-storage unit operated under the turbine operating conditions could be classified into three situations. Firstly, as net load was less than the starting power of turbine, pumped-storage units were not operating. Secondly, as net load was greater than the starting power and less than the rated power of turbine, pumped-storage units were operating at the turbine condition as net load power. Thirdly, as net load was less than the rated power of turbine, pumped-storage units were operating as the rated power of turbine. When net load was less than zero, pumped-storage units operated under the pump operating conditions could be classified into two situations. Firstly, as net load was less than the rated power of pump, pumped-storage units were not operating. Secondly, as net load was greater than the rated power of pump, pumped-storage units were operating as the rated power of pump.%根据多能互补发电系统的特点和作用,建立了系统中抽水蓄能的数学模型,提出了系统中抽水蓄能的运行策略,即按给定负荷运行,具体在本系统中即为按系统净负荷运行.由此提出系统中抽水蓄能的控制方式.当系统净负荷大于0时,抽水蓄能机组运行在水轮机工况,分3种情况:当系统净负荷小于水轮机工况的启动功率时,抽水蓄能机组不运行;当系统净负荷大于水轮机工况的启动功率而小于水轮机工况的额定功率时,抽水蓄能机组按净负荷功率运行在水轮机工况;当系统净负荷小于水轮机的额定功率时,抽水蓄能机组按水

  14. Modeling and numerical simulation of a novel solar-powered absorption air conditioning system driven by a bubble pump with energy storage

    Institute of Scientific and Technical Information of China (English)

    QIU Jia; LIANG Jian; CHEN GuangMing; DU RuXu

    2009-01-01

    This paper presents a novel solar-powered absorption air conditioning system driven by a bubble pump with energy storage. It solves the problem of unreliable solar energy supply by storing the working fluids and hence, functions 24 h per day. First, the working principles are described and the dynamic models for the primary energy storage components are developed. Then, the system is evaluated based on a numerical simulation. Based on the meteorological data of a typical day in a subtropical area, with the area of a solar collector being set at 19.15 m2, whilst the initial charging mass, mass fraction and temperature of the solution are respectively set at 379.5 kg, 54.16% and 34.5 ℃, it is found that the respective coefficients of performance (COP) of the air conditioning system and the en-tire system (including the solar panel) are 0.7771 and 0.4372. In particular, the energy storage density of the system is 206.69 MJ/m3 which is much greater than those of chilled water or hot water storage systems under comparable conditions. This makes the new system much more compact and efficient. Finally, an automatic control strategy is given to achieve the highest COP when solar energy fluctuates.

  15. 风/光/抽蓄复合系统的建模与仿真%Modeling and simulation of hybrid wind/PV/pumped-storage system

    Institute of Scientific and Technical Information of China (English)

    任岩; 郑源; 李延频

    2011-01-01

    将抽水蓄能电站与风光互补系统相结合,建立了风/光/抽蓄复合系统数学模型,其中风力发电模型采用厂家提供的特性曲线利用线性插值的方法得到,光伏发电采用Hay模型,对可逆式水泵水轮机的水泵工况和水轮机工况分别建模,对蓄电池建立充电和放电模型.利用VC 2008开发工具开发了界面友好的仿真软件,实现了对复合系统中的风力发电机输出功率、光伏阵列输出功率、可逆式水泵水轮机的水泵工况与水轮机工况的输出功率及交流直流负载的仿真.通过实例计算得知:在风力发电机和光伏阵列的总出力小于总负荷量时,可逆式水泵水轮机运行在水轮机工况,发电供给负荷;在风速最大或光照最强的几个小时内,风力发电机和光伏阵列的总出力大于总负荷量时,可逆式水泵水轮机处于抽水工况,将多余的电能以水能的形式储存起来;蓄电池一般情况下都在满容量状态,只有在瞬时负荷或负荷很大时才放电,放电后又能及时充电.%By combining pumped-storage power station and hybrid wind/PV system, hybrid wind/PV/ pumped-storage system was established, in which wind power model was achieved by manufacturer provided linear-interpolating characteristic curve, PV modeled by Hay model, charging model and discharging model for battery as well as pump condition and turbine condition for reversible pump-turbine were modeled, respectively. Using VC 2008, an user-friendly simulation software was developed , which can simulate the output power of wind turbine, PV, reversible pump-turbine and AC/DC loads. By an example the following were achieved. Firstly, as the total power of wind and PV was less than the total loads, the reversible pump-turbine operated in turbine mode to generate power for loads. In the several hours of higher light intensity and higher wind speed, the total power of wind and PV was more than the total loads,and the

  16. Energy Performance and Economic Evaluation of Heat Pump/Organic Rankine Cycle System with Sensible Thermal Storage

    DEFF Research Database (Denmark)

    Carmo, C.; Dumont, O.; Nielsen, M. P.

    2016-01-01

    that consists of a ground-source heat pump with possibility of reversing operation as an ORC power cycle combined with solar heating in a single-family building is introduced. The ORC mode enables the use of solar energy in periods of no heat energy demand and reverses the heat pump cycle to supply electrical......The interaction between electrical and thermal energy demands represent a potential area for balancing supply and demand that could contribute to the integration of intermittent renewables in energy systems. To enable the interaction between thermal and electric energy, an innovative concept...... power.This paper combines a dynamic model based on empirical data of the HP/ORC system with lessons learned from 140 heat pump installations operating in real-life conditions in a cold climate. These installations were monitored for a period up to 5 years.Based on the aforementioned model and real...

  17. Energy performance and economic evaluation of heat pump/organic rankine cycle system with sensible thermal storage

    DEFF Research Database (Denmark)

    Carmo, Carolina; Dumont, Olivier; Nielsen, Mads Pagh

    2016-01-01

    that consists of a ground-source heat pump with possibility of reversing operation as an ORC power cycle combined with solar heating in a single-family building is introduced. The ORC mode enables the use of solar energy in periods of no heat energy demand and reverses the heat pump cycle to supply electrical......The interaction between electrical and thermal energy demands represent a potential area for balancing supply and demand that could contribute to the integration of intermittent renewables in energy systems. To enable the interaction between thermal and electric energy, an innovative concept...... power. This paper combines a dynamic model based on empirical data of the HP/ORC system with lessons learned from 140 heat pump installations operating in real-life conditions in a cold climate. These installations were monitored for a period up to 5 years. Based on the aforementioned model and real...

  18. Technical development of electric power storage system. New technological development of pumped hydroelectric power plant by Mitsubishi Heavy Industries

    Energy Technology Data Exchange (ETDEWEB)

    1988-07-01

    This report introduces the outline of the superhigh head (700-800 m) pumping water wheel and variable pumped hydroelectric power system. Due to the superheightening of head, the influence of the head loss generated in each water flowing portion to the efficiency is more severe than that of the pumping water wheel so far used. To improve it, a computorized analysis being made with high accuracy, the simplification of model testing was planned. As regards the problem of axial vibration, it was confirmed that the axial vibration calculation, using the horizontal exciting force secured by the model testing, is effective, as its result, for the prediction of axial vibration. In order to isolate the runner from the vibration, the FEM analysis facilitated the obtainment with accuracy of the characteristic frequency of runner. For the purpose of frequency control (AFC) of the electric power system, variable low frequency electric current being flown on the rotor's side, the adoption of cyclo-inverter to control the rotative velocity enabled the superheightening of efficiency and widening of operational range, particularly in case of partially loaded operation, and the generation control of cavitation and vibration. (11 figs)

  19. Boiler heat pump with an integrated ice storage device. Final report; Heizkessel-Waermepumpe mit integriertem Eisspeicher. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Maier-Laxhuber, P.

    2001-03-01

    In the frame of the project boiler heat pump an energy-efficient heating system for space heating and service water is supposed to be developed. The system is a combination consisting of a state-of-the-art condensing value boiler and a thermally driven solid matter sorption heat pump with the natural and environmentally friendly working material pair water/zeolite. A heat exchanger concept has been found during the pre-phase based upon which a cost-effective and highly efficient boiler heat pump appears to be feasible. (orig.) [German] Im Rahmen des Projekts Heizkessel-Waermepumpe soll ein energieeffizientes Heizsystem fuer Raumheizungen und Brauchwasser entwickelt werden. Das System ist eine Kombination aus einem Brennwertkessel des aktuellen Standes der Technik und einer thermisch angetriebenen Feststoff-Sorptionswaermepumpe mit dem natuerlichen und umweltvertraeglichen Arbeitsstoffpaar Wasser/Zeolith. Im Rahmen der vorausgegangenen Vorphase wurde eine Waermetauscherkonzeption gefunden, die eine kostenguenstige und mit hohem Wirkungsgrad arbeitende Heizkessel-Waermepumpe moeglich erscheinen laesst. (orig.)

  20. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches - UPH. Appendix B: Shafts

    Science.gov (United States)

    1981-04-01

    An assessment of shaft requirements for an underground pumped hydroelectric (UPH) facility is documented. Shaft requirements for both the construction and the permanent operation phases of the facility are outlined. Possible shaft arrangements are developed and the design of shaft linings is discussed. Methods of shaft sinking are reviewed. Alternative schedules for the sinking of the shafts are described and a preferred schedule selected. The material presented and also the cost estimates are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage with a nominal head of 4600 ft. Studies subsequently carried out, including power plant design, head optimization analyses for the overall UPH surface and underground configuration, and further refinement of selected designs, have modified some of the material given.

  1. 风电与抽水蓄能联合优化运行%Optimization Operation of Wind Power and Pumped Storage

    Institute of Scientific and Technical Information of China (English)

    赵诗雅; 常帅; 王仕龙; 杨培培

    2015-01-01

    Pumped storage power combined power plant and wind farm operation not only can better meet the needs of actual load,but also get more substantial economic benefits.Considering reservoir capacity and unit start stop and the fluc-tuation of electricity price and other constraints,the economy and stability of the target of joint optimal operation mode with wind power and pumped storage is proposed in this article.In order to verify the feasibility of the mode,genetic algorithm is used to solve the problem of practical examples.The simulation results show that the established model and the feasibili-ty and effectiveness of the algorithm.%抽水蓄能电站与风电场联合运行不仅能够较好地满足实际负荷的需求,还能获得更丰厚的经济效益。在考虑水库容量、机组启停以及波动电价等约束条件前提下,文中提出以经济性和稳定性为目标的风电与抽水蓄能联合优化运行模式。为验证所建模式可行,采用遗传算法对实际生活中的算例进行求解,仿真分析结果表明:所建的模型和所用算法是可行和有效的。

  2. Use of time-subsidence data during pumping to characterize specific storage and hydraulic conductivity of semi-confining units

    Science.gov (United States)

    Burbey, T. J.

    2003-09-01

    A new graphical technique is developed that takes advantage of time-subsidence data collected from either traditional extensometer installations or from newer technologies such as fixed-station global positioning systems or interferometric synthetic aperture radar imagery, to accurately estimate storage properties of the aquifer and vertical hydraulic conductivity of semi-confining units. Semi-log plots of time-compaction data are highly diagnostic with the straight-line portion of the plot reflecting the specific storage of the semi-confining unit. Calculation of compaction during one-log cycle of time from these plots can be used in a simple analytical expression based on the Cooper-Jacob technique to accurately calculate specific storage of the semi-confining units. In addition, these semi-log plots can be used to identify when the pressure transient has migrated through the confining layer into the unpumped aquifer, precluding the need for additional piezometers within the unpumped aquifer or within the semi-confining units as is necessary in the Neuman and Witherspoon method. Numerical simulations are used to evaluate the accuracy of the new technique. The technique was applied to time-drawdown and time-compaction data collected near Franklin Virginia, within the Potomac aquifers of the Coastal Plain, and shows that the method can be easily applied to estimate the inelastic skeletal specific storage of this aquifer system.

  3. 响洪甸抽水蓄能电站电动发电机定子现场下线%Site Winding-embeding of Motor-generator' s Stator in Xianghongdian Water Pumped Storage Station

    Institute of Scientific and Technical Information of China (English)

    李昌喜

    2000-01-01

    详细介绍响洪甸抽水蓄能电站电动发电机定子现场下线施工工艺。%A detailed introduction is given to the site winding-embeding of motor-generator' s stator in Xianghongdian Water Pumped Storage Station in this paper.

  4. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 4: System planning studies

    Science.gov (United States)

    1981-04-01

    Preliminary design and planning studies of water compensated compressed air energy storage (CAES) and underground pumped hydroelectric (UPH) power plants are presented. The costs of the CAES and UPH plant designs, and the results of economic evaluations performed for the PEPCO system are presented. The PEPCO system planning analysis was performed in parallel stages with plant design development. Analyses performed early in the project indicated a requirement for 1000 MW/10,000 MWH of energy storage on a daily operating schedule, with economic installation in two segments of 500 MW in 1990 and 1997. The analysis was updated eighteen months later near the end of the project to reflect the impact of new growth projections and revised plant costs. The revised results indicated economic installations for either UPH or CAES of approximately 675 MW/6750 MWH on a daily cycle, installed in blocks of approximately 225 MW in 1990, 1993 and 1995. Significant savings in revenue requirements and oil fuel over the combustion turbine alternative were identified for both CAES and UPH.

  5. 2D Conduction Simulation of a PCM Storage Coupled with a Heat Pump in a Ventilation System

    Directory of Open Access Journals (Sweden)

    Joseph Virgone

    2016-06-01

    Full Text Available Efforts to simulate heat transfer in a PCM (Phase Change Material storage device are generally led by considerations of Biot number and material thickness, of 2D versus 1D representation, and of possible hysteresis effects arising from the characterisation of the PCM using differential scanning calorimetry (DSC. In this paper we present a numerical treatment of heat conduction in a paraffin-based storage brick, based on experimental data for a full scale, heat storage component studied under laboratory conditions. The PCM was modelled adopting equivalent thermophysical properties during the phase change. An equivalent heat capacity and thermal conductivity were provided for an appropriate description of energy release and storage in the process of solidification and melting. The geometry of the metal container induces 2D effects that are generally neglected in numerical modelling. The thickness of the plates (about 2 cm is sufficiently large to require the modelling of conduction in the PCM, but can also induce convection that has been neglected in this study. Experimental results are presented and compared for both a 1D and 2D model of the PCM device. It was concluded that a 2D representation is essential for configurations; like the case study and geometry we had; with a large difference in thermal conductivity between PCM and metal casing. Two curves of equivalent heat capacity (measured via DSC were introduced for heating and cooling phases. Comparisons to experimental results indicated significant errors in the models during melting and solidification of the PCM, which could be reduced by instead adopting the mean of the two heat capacity curves. The rate of temperature change during the experiments and for the DSC characterisation was analysed and found to explain well the observations. In particular, as novelty, two peaks of equivalent heat capacity have been observed with DSC when the rate is very low instead of only one peak using

  6. Examples of cost reduction and energy saving by thermal storage heat pump system. Part 5. Control of the flowering season of alstroemeria by using 'ice storage ground cooler'. Chikunetsushiki heat pump system katsuyo ni yoru costdown sho energy jirei no shokai. 5. 'Kori chikunetsushiki chichu reikyaku sochi' ni yori arusutoromeria no kaika jiki wo chosetsu

    Energy Technology Data Exchange (ETDEWEB)

    1999-07-01

    Alstroemeria has a habit to flower by sensing temperature through an organ in rhizome. Since its market price is higher in late fall and early winter, a culture method cooling the ground in summer is in wide use. Although the ground is cooled with an equipment composed of a chiller, ground piping for heat exchange and cold water pump during the whole day, cost reduction is a major problem. To study a heat storage ground cooler, its culture test was made by using a prototype ice storage ground cooler. The test result showed that ground temperature of both test zone and reference zone was constantly 18-20 degrees C during the test period, and both the whole yield and that every class were nearly equivalent between the test and reference zones. The estimation result on the profitability of a full-scale ice storage ground cooler based on the above result showed that this ground cooler probably can reduce annual electric charge by nearly 200,000 yen as compared with a cooler without heat storage. (NEDO)

  7. Examples of cost reduction and energy saving by thermal storage heat pump system. Part 5. Control of the flowering season of alstroemeria by using `ice storage ground cooler`; Chikunetsushiki heat pump system katsuyo ni yoru costdown sho energy jirei no shokai. 5. `Kori chikunetsushiki chichu reikyaku sochi` ni yori arusutoromeria no kaika jiki wo chosetsu

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-07-01

    Alstroemeria has a habit to flower by sensing temperature through an organ in rhizome. Since its market price is higher in late fall and early winter, a culture method cooling the ground in summer is in wide use. Although the ground is cooled with an equipment composed of a chiller, ground piping for heat exchange and cold water pump during the whole day, cost reduction is a major problem. To study a heat storage ground cooler, its culture test was made by using a prototype ice storage ground cooler. The test result showed that ground temperature of both test zone and reference zone was constantly 18-20 degrees C during the test period, and both the whole yield and that every class were nearly equivalent between the test and reference zones. The estimation result on the profitability of a full-scale ice storage ground cooler based on the above result showed that this ground cooler probably can reduce annual electric charge by nearly 200,000 yen as compared with a cooler without heat storage. (NEDO)

  8. 利用风蓄联合削峰的电力系统经济调度%An Economic Dispatching Strategy of Peak Load Shifting by Wind Farm and Pumped Storage Plant

    Institute of Scientific and Technical Information of China (English)

    盛四清; 孙晓霞

    2014-01-01

    风电出力具有波动性和反调峰特性,大规模风电接入电网间接拉大了负荷的峰谷差,使火电机组频繁启停,系统运行成本增大。抽水蓄能电站因其良好的储能能力以及调度的高度灵活性往往作为系统的调峰电源。将二者结合,提出了风蓄联合系统削峰的调度策略,利用抽水蓄能的储能环节将风电出力时空平移,使原本波动无序的风电成为稳定可调度的电源,具备削峰填谷的能力,平滑净负荷曲线。建模引入最大化风蓄联合出力的目标函数,不仅减少了火电出力的燃煤耗费,而且避免了弃风的遗憾,充分发挥了风蓄节能环保的优势。算例分析验证了所提模型的可行性和有效性。%Power output of wind farm possesses both properties of fluctuation and counter-peak load regulation, therefore grid-connection of large-scale wind power enlarges the peak-to-valley difference of load indirectly and makes frequent start/stop of thermal generating units, thus the operational cost of power grid increases. Due to its excellent energy storage capability and outstanding dispatching flexibility, the pumped storage plant is often used for peak load shaving. Combining the wind farm with the pumped storage plant, a scheduling strategy based on the combination of the wind farm with the pumped storage plant is proposed. Utilizing the energy storage capability of the pumped storage plant the power output of the wind farm during the peak load period is transferred to the pumped storage plant to retain water, thus the stored wind power output, which disorderly fluctuates originally, can be used for peak load shaving. A multi-objective scheduling model of power grid containing the wind farm and the pumped storage plant, in which the minimum operational cost of thermal power generation units, the minimum variance of net load and the maximum power output of combined wind farms and pumped storage plants are taken

  9. 三套管蓄能型热泵的制冷实验%Refrigeration Performance of the Triple-Sleeve Energy Storage Exchanger Based Energy Storage Heat Pump

    Institute of Scientific and Technical Information of China (English)

    曲德虎; 倪龙; 姚杨; 牛福新

    2016-01-01

    To perceive cooling behaviors of the triple-sleeve energy storage exchanger(TRESE)based energy storage heat pump system,a 2,HP prototype was manufactured and run to manifest the cooling performance of the novel sys-tem. Experiments included four operation modes under space cooling state. Results reflect that cooling cycle COP is from 2.4 to 3.7 when dry bulb temperature is lower than 25,℃ during nighttime. COP of TRESE cooling combined with air source heat pump is from 2.4 to 2.9 as outdoor dry bulb temperature is from 35 to 43,℃,which rises by 15%more than that of space cooling by air source heat pump only. When flow rate of cold water through TRESE is 40,L/h,the cooling rate of TRESE in combined cooling is 7.7% with scarcely wave,even with ambient tempera-ture changes. If opening all three TRESEs,the cooling rate of TRESE in combined cooling will be increased up to 23%.%为考察三套管蓄能型热泵(TRESE)的制冷性能,对一台2,HP样机的4种制冷模式分别进行了实验研究.实验结果表明,夜间室外干球温度低于25,℃时,三套管蓄能型热泵的周期制冷COP较高,其值在2.4~3.7之间;三套管蓄能器与空气源热泵联合供冷模式的COP较高,在室外干球温度为35~43,℃的范围内,其值在2.4~2.9之间,较空气源热泵单独供冷模式的COP提高了15%;当三套管蓄能器供冷水流量为40,L/h时,联合供冷期间三套管蓄能器的供冷百分比稳定在7.7%左右,受室外气温的影响不大;若将样机中3组三套管蓄能器同时开启,则三套管蓄能器的供冷率在联合供冷中的比例可提升至23%.

  10. Performance Evaluation of HP/ORC (Heat Pump/Organic Rankine Cycle) System with Optimal Control of Sensible Thermal Storage

    DEFF Research Database (Denmark)

    Do Carmo, Carolina Madeira Ramos; Nielsen, Mads Pagh; Elmegaard, Brian

    2016-01-01

    energy in periods of no thermal energy demand and reverses the heat pump cycle to supply electrical power. A dynamic model based on empirical data of this system is used to determine the annual performance. Furthermore, this work assesses the benefits of different control strategies that address...... of the users. Results show that real load control logic can lessen the adverse effects of cycling in the compressor of the system as well as increase the thermal demand (up to 33%) and the electrical demand (max. 8.4%) covered by renewable energy (solar). However, the extension of these improvements is highly......In energy systems with high share of renewable energy sources, like wind and solar power, it is paramount to deal with their intrinsic variability. The interaction between electric and thermal energy (heating and cooling) demands represent a potential area for balancing supply and demand that could...

  11. 带有抽水压缩气体储能装置的制冷系统%Refrigeration System with Pumping Compressed Gas Energy Storage Device

    Institute of Scientific and Technical Information of China (English)

    李瑞雄; 王飞; 时文刚; 王焕然; 王峰

    2015-01-01

    To explore the new way of intermittent energy applications,a composite refrigeration system was proposed,which e-quips with pumping compressed air energy storage device.During the stage of energy storage,the refrigeration system converted e-lectric energy into internal energy of gas-pressurized through the water pump in the cabin;At the energy release stage,the internal water flow through turbine that will drive directly the cycle of refrigeration under the cabin’s gas-pressurized,and the heat of the condenser in refrigeration cycle is absorbed by high pressure gas inside the cabin,eventually completed the purposes of using in-termittent energy refrigeration.This paper established the thermodynamic model to describe the energy storage and refrigeration process,and focuses on the change of the key node thermodynamic parameters during storage and cooling process.Contrasting with the literature energy storage refrigeration system,this system has higher refrigeration coefficient.And it provides a new way for the development of intermittent energy application.%为开拓间歇式能源应用新途径,本文提出了一种复合制冷系统,该系统带有抽水压缩气体储能装置。在储能阶段,该储能制冷系统通过水泵将电能转换为水气共容舱内带压气体的内能;释能阶段,在水气共容舱内高压气体的作用下,使其内部的水流经水轮机直接驱动制冷循环制冷,而制冷循环中冷凝器所释放的能量被水气共容舱内的高压气体全部吸收,最终完成了利用间歇式能源制冷之目的。文中建立了描述储能与制冷过程的热力学模型,并重点研究了储能和制冷过程中关键节点的热力学参数变化规律,与文献给出的储能制冷系统相比,该系统具有较高的制冷系数。为拓展间歇式能源实际应用途径提供了一种新思路。

  12. Ground water heat pumps and cooling with ground water basins as seasonal storage; Grundvandsvarmepumper og -koeling med grundvandsmagasiner som saesonlager

    Energy Technology Data Exchange (ETDEWEB)

    2008-04-15

    Ground water temperature is constant all the year round, in Denmark approximately 9 deg. C, which is ideal for a number of cooling purposes including cooling of buildings. The structures in which the ground water flows (sand, gravel and chalk) are efficient for storing coldness and heat over longer periods. By using seasonal storage of low-temperature heat and coldness in ground water layers close to the terrain it is feasible to reach profitable energy savings of up to 90% for cooling and heating of e.g. hotels, airports, shopping malls, office buildings and other larger buildings. At the same time the large energy savings means major reduction of CO{sub 2} emissions. (BA)

  13. Ground water heat pumps and cooling with ground water basins as seasonal storage; Grundvandsvarmepumper og -koeling med grundvandsmagasiner som saesonlager

    Energy Technology Data Exchange (ETDEWEB)

    2008-04-15

    Ground water temperature is constant all the year round, in Denmark approximately 9 deg. C, which is ideal for a number of cooling purposes including cooling of buildings. The structures in which the ground water flows (sand, gravel and chalk) are efficient for storing coldness and heat over longer periods. By using seasonal storage of low-temperature heat and coldness in ground water layers close to the terrain it is feasible to reach profitable energy savings of up to 90% for cooling and heating of e.g. hotels, airports, shopping malls, office buildings and other larger buildings. At the same time the large energy savings means major reduction of CO{sub 2} emissions. (BA)

  14. Economic analysis of pumped-storage unit in electricity system with multi-type power sources%多元电力系统中抽水蓄能的经济性问题研究

    Institute of Scientific and Technical Information of China (English)

    王晓晖; 张粒子; 程世军

    2014-01-01

    This paper proposes an approach to evaluate the economics of pumped-storage units from the perspective of a multi-type power system. An MIP-based unit commitment model with various types of power sources is established, which integrates thermal, CCGT, hydro, wind, nuclear with pumped-storage units. Based on the model, the net present value of pumped-storage per megawatt is calculated. By comparing the net present value with the capital cost per megawatt, the economic evaluation of pumped-storage unit is conducted. The case study proves the feasibility of the model and the above approach. Furthermore, this paper analyzes the influence on the economic results of pumped-storage units by the change of peak-valley difference of the system load, the regulating range of thermal units, the capacity of nuclear and wind power, and the thermal-hydro proportion. The case study shows that the economics of pumped-storage is most influenced by the change of the capacity of nuclear and wind power and the thermal-hydro proportion.%提出了从多元电力系统的角度对抽水蓄能进行经济性分析的方法。基于混合整数规划构建了含火电、CCGT、水电、风电、核电、抽水蓄能等各类电源的多元电力系统机组组合模型。采用该模型计算抽水蓄能单位容量的收益现值,并与单位容量的投资成本比较以分析其经济性。算例测试的结果证明了模型和方法的可行性。在此基础上,进一步研究了负荷侧的峰谷差率、电源侧的风电容量、水火电比例、核电容量和火电调节范围变化对抽水蓄能经济性的影响。算例结果显示,水火电比例、风电容量以及核电容量的变化对抽水蓄能的经济性的影响较大。

  15. Numerical Simulation and Experimental Study of Self-pumping Vacuum Flywheel Energy Storage Device%自抽真空飞轮储能装置的数值模拟与实验研究

    Institute of Scientific and Technical Information of China (English)

    朱桂华; 刘金波; 孙欣

    2012-01-01

    Due to the wind loss of flywheel in disc motor type flywheel energy storage devices, the paper focused on using self-pumping vacuum flywheel energy storage devices to reduce the wind loss, an interior molecular pump of flywheel energy storage devices is designed, and viscous gas flow and slip flow in the rotor spiral groove of the inte- rior molecular pump is simulated by computational fluid dynamics method to analyze its vacuuming performance. The vacuum-pumping time of flywheel energy storage devices in self-pumping style is compared with that in common external vacuum system. The results demonstrate that there always exists pressure difference between the entrance and the exit of the rotor spiral groove of the interior molecular pump of self-pumping style. Within the scope of 12 000 r/min - 60 000 r/min, vacuuming performance is good, and it only takes 1/20 of the time when the common external vacuum system needs to reach 0.01 Pa.%针对盘式电机型飞轮储能装置的飞轮风损情况,采用自抽真空飞轮储能装置来减少飞轮风损,设计了飞轮储能装置的内置分子泵,再用计算流体动力学法模拟内置分子泵转子螺旋槽内的气体粘滞流、滑移流,分析其抽真空性能,最后进行自抽真空方式与普通外置真空系统对飞轮储能装置抽真空时间对比。结果表明:自抽真空飞轮储能装置的内置分子泵螺旋槽入口与出口总存在压力差,在12 000 r/min~60 000 r/min范围内抽真空性能较好,达到0.01 Pa所需时间仅为外置真空系统抽气时间的1/20左右,表明此装置抽气时间短并切实可行。

  16. 抽水蓄能机组双微机励磁系统的研究%Research of Excitation System Based onDouble-Microprocessor in Pumped Storage Units

    Institute of Scientific and Technical Information of China (English)

    曾显达; 杨伟; 刘鹏

    2000-01-01

    According to the characteristic of excitation system control and operation in pumped storage u nit, this paper gives the detailed analysis and research on electric start-up of pumped storage unit, choice of main circuit, design of the hardware and software of microprocessor-regulator based on STD Industry control computer, and reliability of excitation system.%根据抽水蓄能机组励磁系统的调节控制理论与运行特点,对抽水蓄能机组的电气启动投励、主回路选择、STD工控机微机调节器硬件、软件设计及系统可靠性方面进行研究与分析。

  17. Design of the Seawater Source Heat Pump and Ice Thermal Storage Complex System for A Certain Residential Section%某住宅小区海水源热泵与冰蓄冷复合系统设计

    Institute of Scientific and Technical Information of China (English)

    谢文利; 罗苏瑜

    2015-01-01

    According to the seawater source heat pump and ice thermal storage complex system designs, the paper in-troduced the selection of the system’s major equipment, the operation strategy of the ice thermal storage air-condition system under different load factors, design of the seawater source heat pump water intake and heat exchange system, economic analysis of the system, which provide theoretical and practical templet for large-scale heating and cooling construction of the seawater source heat pump and ice thermal storage system.%本文通过海水源热泵与冰蓄冷复合系统设计实例,介绍了系统主要设备选型、不同负荷率下冰蓄冷空调系统的运行策略、海水源热泵取水及其换热系统设计、系统经济性分析。为实施大型海水源热泵与冰蓄冷复合系统工程供热供冷提供理论和实践样板。

  18. Mitigation of Wind Curtailment by Coordinating With Pumped Storage%以减少电网弃风为目标的风电与抽水蓄能协调运行

    Institute of Scientific and Technical Information of China (English)

    邹金; 赖旭; 汪宁渤

    2015-01-01

    由于风电出力特性及电力系统运行约束等限制,电网接入大量风电时将会导致大量弃风.对风电与抽水蓄能协调运行以减少电网弃风的方式进行研究,在分析导致电网弃风的主要因素的基础上,充分考虑抽水蓄能的运行特性,以电网弃风最小为优化目标,建立风电和抽水蓄能协调运行的混合整数规划模型.基于实际电力系统的风电出力和负荷数据,在IEEE 30节点系统中对风电与抽水蓄能协调运行方式进行模拟.结果表明,所提出的优化模型能有效地模拟风电与抽水蓄能协调运行的过程;风电与抽水蓄能的协调运行方式对减少电网弃风具有显著的作用;对具有一定风电装机容量的电网,存在最优的抽水蓄能容量与之协调运行,使得电网弃风最小.%Integrating large amounts of wind energy into power system may cause wind curtailment due to wind power output characteristics and system operational constraints. In this paper, the impacts of coordinating with pumped storage on wind curtailment mitigation are studied. By analyzing factors inducing wind curtailment and taking the operational characteristics of pumped storage into consideration, a mixed integer programming model with optimization objective of minimizing wind curtailment was formulated to study this problem. With wind power and load data from real system, simulations were carried out with the modified IEEE 30-bus system, results show that the proposed optimization model simulates the coordination of wind and pumped storage effectively, wind curtailment is significantly decreased by adding pumped storage into the power system. There exists an optimal capacity of pumped storage to make the whole wind curtailment minimal.

  19. Analysis on Development Prospect of Pumped-storage Power Station in Guangxi%广西抽水蓄能电站的发展前景分析

    Institute of Scientific and Technical Information of China (English)

    田明俊

    2014-01-01

    ∶优化电源结构,深度开发水电、优化发展煤电、合理消纳西电、积极发展核电、因地制宜开发风电等清洁和可再生能源是实现广西电力可持续发展和“节能减排”战略目标的重要措施。抽水蓄能电站在电力系统中具有调峰填谷、调相调频和紧急事故备用等多种功能,是现代电力系统中最有效的调节工具之一,对优化电源结构、促进广西核电和风电等清洁能源的大规模发展、保障电力系统安全运行具有重要作用。%To realize power sustainable development and the strategic target of energy-saving and emission-reduc-tion, the power source structure must be optimized by vigorously developing hydropower, nuclear power, wind power and other clean and renewable energies, and scientifically developing coal power in compliance with local conditions. Pumped storage power station, as the powerful regulation tool in modern power system realizing by peak cutting and valley filling, phase and frequency modulating etc., plays a significant role in optimizing power structure, developing large-scale clean energy and in safe operation of power system of Guangxi.

  20. The energy-saving dispatch based on the coordination between pumped storage hydro and wind energy%基于风蓄协调的节能调度方法

    Institute of Scientific and Technical Information of China (English)

    张鹏; 刘继春; 吕林; 杨柳

    2011-01-01

    为解决节能调度中风能接入造成运行成本增加和可靠性降低的问题,提出了一种基于风蓄协调系统的节能调度方法.通过引入多个整型优化变量与协调周期不平衡量约束,反映抽水蓄能机组发电、抽水、空闲等不同运行状态以及风电机组的出力波动特性,并采用混合整数规划方法求解.算例分析表明,该模型能克服风能的间歇性和波动性缺点,提高系统运行可靠性与风能利用率,降低整体运行成本,能提供抽水蓄能机组适应节能调度需求的新型调度方案,具有显著的经济效益与实用价值.%To solve the problems of operation cost increase and reliability decrease after wind power integration in energy-saving dispatch, this paper proposes an energy saving dispatch method based on coordination between pumped storage hydro and wind energy. Through introducing several integer variables which denote different operation states (generation, pumping and idle) of pumped storage hydro unit, and the imbalance constraint during coordination period which illustrates the volatility characteristic of wind power, this paper establishes the energy-saving dispatch model based on the coordination between pumped storage hydro energy and wind energy and solves the model by using mixed integer programming method. The case study shows that this model can overcome the shortcoming of intermittency and volatility of wind power, enhance the reliability of power system and availability rate of wind power, and decrease the operation cost of whole system. The model can also give the new dispatch schedule of pumped storage hydro unit, which meets the requirement of energy saving and thus has significant economic benefits and practical value.

  1. Cost estimation 2012 for the electrical and mechanical equipment of the power house in hydropower projects and pumped storage projects. Equipment with Pelton turbines, Francis turbines, Kaplan Turbines, Kaplan tube turbines, bulb turbines and Francis pump-turbines; Kostenschaetzung 2012 fuer die elektrische und mechanische Ausruestung des Krafthauses in Wasserkraft- und Pumpspeicher-Projekten. Ausruestung mit Pelton-, Francis-, Kaplan-, Kaplan-Rohr-, Bulb-Turbinen oder Francis-Pumpturbinen

    Energy Technology Data Exchange (ETDEWEB)

    Alvarado-Ancieta, Cesar Adolfo

    2012-07-01

    The compilation of statistical data on costs for the electrical and mechanical equipment of approximately 140 selected hydropower projects and pumped storage projects in 46 countries in America, Europe, Asia and Africa provides helpful diagrams with which the cost of the electrical and mechanical equipment of Pelton turbines, Francis turbines, Kaplan Turbines, Kaplan tube turbines, bulb turbines and Francis pump-turbines can be determined.

  2. Peak Discharge, Flood Profile, Flood Inundation, and Debris Movement Accompanying the Failure of the Upper Reservoir at the Taum Sauk Pump Storage Facility near Lesterville, Missouri

    Science.gov (United States)

    Rydlund, Jr., Paul H.

    2006-01-01

    The Taum Sauk pump-storage hydroelectric power plant located in Reynolds County, Missouri, uses turbines that operate as pumps and hydraulic head generated by discharging water from an upper to a lower reservoir to produce electricity. A 55-acre upper reservoir with a 1.5- billion gallon capacity was built on top of Proffit Mountain, approximately 760 feet above the floodplain of the East Fork Black River. At approximately 5:16 am on December 14, 2005, a 680-foot wide section of the upper reservoir embankment failed suddenly, sending water rushing down the western side of Proffit Mountain and emptying into the floodplain of East Fork Black River. Flood waters from the upper reservoir flowed downstream through Johnson's Shut-Ins State Park and into the lower reservoir of the East Fork Black River. Floods such as this present unique challenges and opportunities to analyze and document peak-flow characteristics, flood profiles, inundation extents, and debris movement. On December 16, 2005, Light Detection and Ranging (LiDAR) data were collected and used to support hydraulic analyses, forensic failure analyses, damage extent, and mitigation of future disasters. To evaluate the impact of sedimentation in the lower reservoir, a bathymetric survey conducted on December 22 and 23, 2005, was compared to a previous bathymetric survey conducted in April, 2005. Survey results indicated the maximum reservoir capacity difference of 147 acre-feet existed at a pool elevation of 730 feet. Peak discharge estimates of 289,000 cubic feet per second along Proffit Mountain and 95,000 cubic feet per second along the East Fork Black River were determined through indirect measurement techniques. The magnitude of the embankment failure flood along the East Fork Black River was approximately 4 times greater than the 100-year flood frequency estimate of 21,900 cubic feet per second, and approximately 3 times greater than the 500-year flood frequency estimate of 30,500 cubic feet per second

  3. 抽水蓄能电站与风电的联合优化运行建模及应用分析%Modeling and Application Analysis of Optimal Joint Operation of Pumped Storage Power Station and Wind Power

    Institute of Scientific and Technical Information of China (English)

    徐飞; 陈磊; 金和平; 刘振华

    2013-01-01

    With its excellent peak clipping and valley filling capability, the pumped storage power station can improve the accommodation capability of the wind power. Based on the actual data of West Inner Mongolia power grid and Hohhot pumped storage power station, the optimal joint operation of pumped storage power station and large-scale grid-connected wind power is simulated and investigated. By considering the intermittency and fluctuation of wind power, an optimization model for the joint operation is developed. The validity of the model is verified through simulation of the joint operation of Hohhot pumped storage power station and wind power integrated to West Inner Mongolia power grid based on the actual data of heating season and nonheating season. The simulation also shows the feasibility and benefit of the joint operation. During the heating season when part of the wind power is curtailed, the pumped storage power station shifts peak load and helps the power grid to accommodate more wind power. During the nonheating season with little wind power curtailment, the pumped storage power station is reserved for wind power and balances the fluctuation of wind power.%抽水蓄能电站具有优良的调峰填谷能力,能够有效提高电网消纳风电的能力.基于蒙西电网和呼和浩特抽水蓄能电站的实际数据,对抽水蓄能电站与大规模并网风电联合优化运行进行了模拟和研究.考虑风电的间歇性和波动性,建立了抽水蓄能电站与风电联合运行的优化模型.然后分别利用供热期和非供热期的系统数据,对蒙西电网中呼和浩特抽水蓄能电站与风电的联合运行进行了模拟,验证了模型的有效性,并说明了抽水蓄能电站与大规模并网风电联合运行的可行性以及带来的显著效益:供热期存在弃风时,抽水蓄能电站充分发挥调峰填谷的能力以减少弃风;非供热期弃风不明显时,抽水蓄能电站主要为风电提供备用,并平衡风电出力波动.

  4. Impacts of the pumped storage power station on the wind generation integration capability of the Shandong Power Grid%抽水蓄能电站对山东电网风电接纳能力的影响

    Institute of Scientific and Technical Information of China (English)

    宋豪; 宋曙光; 王超; 刘远龙; 于大洋; 韩学山

    2011-01-01

    将抽水蓄能机组纳入机组组合问题当中,据此建立了含风电与抽水蓄能电站的系统优化运行模型。以山东电网实际系统为例,根据机组组合的结果分析了不同季节典型日下抽水蓄能电站对于风电接入电网各项指标的影响。结果表明,当风电容量较小时,抽水蓄能电站的作用不明显;只有当风电容量超出系统的接纳能力出现弃风以后,抽水蓄能电站的作用才得以体现出来,风电并网的各项指标随抽水蓄能电站容量的增加有明显的改善。%The pumped storage power station was considered in unit commitment problem.Based on this,an optimal operation model of the power system was built.The impacts of the pumped storage power station(PSPS) with different capacities to targets of grid-connected wind power in a typical day in different seasons were analyzed according to unit commitment results based on the Shandong Power Grid.The results showed that the impact was not obvious when capacity of wind power was small.The targets were improved with increasing the pumped power storage station until the capacity of wind power was so large that some wind power was abandoned.

  5. 抽水蓄能机组暂态故障智能分析系统开发及应用%Design and Application of Transient Fault Analysis System for Pumped-storage Power Unit

    Institute of Scientific and Technical Information of China (English)

    巩宇

    2013-01-01

    由于缺乏完善、实用的知识库,目前没有故障智能分析系统能对工况复杂的抽水蓄能机组最重要的故障模式暂态故障进行有效的分析.为提高抽水蓄能机组故障分析效率,提出了一种可行、实用的故障知识库和分析程序的设计方法,并介绍了广州蓄能水电厂据此开发的计算机故障分析系统的应用情况,最后以两个广州蓄能水电厂的真实故障分析实例验证了该系统的有效性和实用性.%Current fault analysis system is inefficient to analyze the transient faults of pumped-storage power units because of the lack of perfect and practical knowledge base.In order to enhance fault analysis efficiency,a design method for establishing feasible fault knowledge base and practical fault analysis function is proposed,and the application of real fault analysis system which is designed through this method in Guangzhou Pumped Storage Power Station is also introduced.Two fault analysis examples in Guangzhou Pumped Storage Power Station prove the availability and practicability of system.

  6. Design and implementation of ground source heat pumps combined with ice thermal storage systems%地源热泵与冰蓄冷耦合系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    姒勇芳; 王玉刚; 匡环; 董兴杰; 刘月琴

    2012-01-01

    介绍了地源热泵蓄能系统的结构组成,包括地源热泵技术与冰蓄冷技术,分析了两者的技术优缺点,进而讲述了两者联合运行的必要性.在此基础上设计建立了一个生态节能的空调系统,首先对地下埋管的深度及距离的取值进行了分析,并阐述了该系统的运行控制策略和流程,实现了机组在常规空调工况、制冰工况以及供暖工况三者之间的调节.最后,对该系统进行了经济性分析,在运行费用上,比传统空调系统节省69%,具有显著的节能优势.%The structure of ground source heat pump energy storage systems is introduced, that indudes the ground source heat pump technology and the ice thermal storage technology. The technical advantages and disadvantages of both were analyzed. Therefore a joint operation was necessary. Then an ecological air conditioning system was designed; and the depth of buried pipes and the distance between the pipes were analyzed. An operating control strategy was expatiated which included the regulation and workflow among the three working conditions-conventional air conditioning, ice making condition and heating condition. In the end, the economic viability of such a system was evaluated. It was found that under the same condition this system would save 69 % operating cost of a traditional air conditioning system. Obviously, it has a remarkable energy saving adnantage by using the ground source heat pump with energy storage.

  7. A Joint Daily Operational Optimization Model for Wind Power and Pumped-storage Plant%风电-抽水蓄能联合日运行优化调度模型

    Institute of Scientific and Technical Information of China (English)

    胡泽春; 丁华杰; 孔涛

    2012-01-01

    基于日前负荷预测和风电出力预测,研究了风电一抽水蓄能联合日运行的优化方法,提出了电网消纳风电出力的新模式。以风电一抽水蓄能联合运行的效益最大化为目标,考虑抽水蓄能机组的启停限制和发电一抽水工况转换限制,以二次约束表征机组启停约束和抽水蓄能电站运行工况约束,建立了含全天96个时段的混合整数规划模型,并采用商业优化软件求解。基于实际抽水蓄能电站参数设计了算例系统。测试结果表明,抽水蓄能电站与风电场配合可大大降低风电出力随机性对电网运行的负面影响,经济和社会效益显著。%Based on the day-ahead forecast of system load and wind power output, this paper focuses on the optimization of the daily joint operation of wind power and pumped-storage plants, and a new mode of joint operation is proposed. A mixed-integer programming formulation is built to maximize the daily profit of the wind farm and the pumped-storage plant, where the time interval is 15 minutes and the constraints of unit startup-shutdown times are considered. The state change of units is taken into consideration by a quadratic constraint. The whole formulation is solved by commercial optimization software under MATLAB environment. A test case is developed based on the parameters of a practical pumped-storage plant. Simulation results indicate that the coordinated operation of wind farm and pumped-storage plant greatly reduces the negative impact of random wind power output on the power system operation and achieve significant economic and social benefits.

  8. 基于机会约束规划的风-蓄联合动态经济调度%A Chance-Constrained Programming Based Dynamic Economic Dispatch of Wind Farm and Pumped-Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    于佳; 任建文; 周明

    2013-01-01

    Grid-connection of large-scale wind farm with stochastic, fluctuating and counter-peak load regulation features brings severe challenges to dispatching and operation of power grid. According to the output characteristics of wind power generation system, based on smart energy management system (SEMS) a joint dispatching strategy for wind farm and pumped-storage power station is proposed, and based on stochastic programming a dynamic economic dispatching model for power grid with joint-operated wind farm and pumped-storage power station, in which the minimized fluctuation of wind power output alleviated by pumped-storage power and the lowest operating cost of thermal power plants are taken as the objectives, is built and the built model is solved by chaotic particle swarm optimization algorithm. Simulation results of a joint dynamic dispatch of a certain regional power grid composed of thermal plants, wind farm and pumped-storage power station show that the proposed dynamic economic dispatching strategy is reasonable and effective.%  大规模具有随机性、波动性和反调峰特性的风电接入电力系统后,给电力系统的调度运行带来了很大挑战。针对风电出力特性,提出了基于智能能量管理系统(smart energy management system,SEMS)的风-蓄联合调度策略,基于随机规划理论建立了经抽水储能平抑后以风电功率波动最小和火电运行成本最低为目标的风–蓄联合运行的电力系统动态经济调度模型,并采用混沌粒子群优化算法求解模型。仿真结果表明了该调度策略的合理性及有效性。

  9. Commercial Integrated Heat Pump with Thermal Storage --Demonstrate Greater than 50% Average Annual Energy Savings, Compared with Baseline Heat Pump and Water Heater (Go/No-Go) FY16 4th Quarter Milestone Report

    Energy Technology Data Exchange (ETDEWEB)

    Shen, Bo [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Baxter, Van D. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rice, C. Keith [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Abu-Heiba, Ahmad [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2017-03-01

    For this study, we authored a new air source integrated heat pump (AS-IHP) model in EnergyPlus, and conducted building energy simulations to demonstrate greater than 50% average energy savings, in comparison to a baseline heat pump with electric water heater, over 10 US cities, based on the EnergyPlus quick-service restaurant template building. We also assessed water heating energy saving potentials using ASIHP versus gas heating, and pointed out climate zones where AS-IHPs are promising.

  10. Some Technical Problems of Reversible Pump Turbine and in the Construction of Pumped-storage Power Stations%抽水蓄能电站建设及可逆式水泵水轮机的若干技术问题

    Institute of Scientific and Technical Information of China (English)

    端润生

    2012-01-01

    从混流可逆式水泵水轮机的选型问题、水泵水轮机全特性曲线、水轮机工况额定水头的选择、水力-机械过渡过程计算、上水库充水问题和首台机组首次启动方式等7个方面对中国抽水蓄能电站建设及可逆式水泵水轮机的若干技术问题进行了综述和分析,并就问题的解决提出了建议和对策.%Some technical problems of reversible pump turbine and in the construction of pumped-storage power stations in China are summarized and analyzed from seven aspects of the selection of Francis reversible pump turbine, the complete characteristics curve of pump turbine, the selection of rated head at turbine mode, the calculation of hydraulic-mechanical transition process, the water filling of upper reservoir and the first start -up mode of first unit. The suggestions and countermeasures for dealing with above problems are also put forward.

  11. 多能互补发电系统中抽水蓄能的优化配置%Optimal configuration of pumped-storage in hybrid power system

    Institute of Scientific and Technical Information of China (English)

    任岩; 刘雪枫; 郑源; 周兵

    2013-01-01

    Since the capacity of hybrid power system is configured experientially at present causing a high cost and low reliability.the capacity of wind generator and PV arrays were optimized by using the particle swarm optimization method,while the capacity of pumped-storage was optimized by means of the global optimization and local optimum methods.Firstly,the capacity of pumped-storage is configured preliminarily according to the annual load,annual wind and solar energy resources etc; secondly,the capacity configuration is verified and adjusted based on the monthly load,monthly wind and solar energy resources; at last,the configuration is further improved with the typical daily load,daily wind and solar energy resources.For an isolated hybrid Wind-PV-pumped-storage-desalination system,the capacity of pumped-storage was optimized with the global optimization and local optimum methods.The results showed that the preliminarily configured capacity of pumped-storage is 120 kW by means of the annual data,but the capacity needs to be updated to 420 kW by considering required monthly loss of power supply probability in the verifying process.Further,because of the volatility of daily load,wind and solar energy resources,an extra loss of power supply probability still exists,thus a certain capacity of storage battery needs to be configured.%为了解决多能互补发电系统中根据经验进行容量配置而导致成本高、可靠性低的问题,对风力发电机和光伏阵列的容量利用粒子群优化方法进行配置,抽水蓄能的容量利用整体一局部法进行优化配置.通过年负荷、年风能资源和年太阳能资源等初步配置其容量;再根据月负荷、月风能资源和月太阳能资源等进行校核、调整;最后,根据典型日负荷及相应的风能资源和太阳能资源等对其容量做进一步完善.以一套海岛孤网风-光-抽蓄-海水淡化系统为例,利用整体-局部法对系统中的抽水蓄能进行

  12. Centrifugal pumps

    CERN Document Server

    Anderson, HH

    1981-01-01

    Centrifugal Pumps describes the whole range of the centrifugal pump (mixed flow and axial flow pumps are dealt with more briefly), with emphasis on the development of the boiler feed pump. Organized into 46 chapters, this book discusses the general hydrodynamic principles, performance, dimensions, type number, flow, and efficiency of centrifugal pumps. This text also explains the pumps performance; entry conditions and cavitation; speed and dimensions for a given duty; and losses. Some chapters further describe centrifugal pump mechanical design, installation, monitoring, and maintenance. The

  13. Pumping life

    DEFF Research Database (Denmark)

    Sitsel, Oleg; Dach, Ingrid; Hoffmann, Robert Daniel

    2012-01-01

    of membrane proteins: P-type ATPase pumps. This article takes the reader on a tour from Aarhus to Copenhagen, from bacteria to plants and humans, and from ions over protein structures to diseases caused by malfunctioning pump proteins. The magazine Nature once titled work published from PUMPKIN ‘Pumping ions......’. Here we illustrate that the pumping of ions means nothing less than the pumping of life....

  14. 含风电场系统风电与抽水蓄能匹配容量研究%RESEARCH ON OPTIMAL CAPACITY BETWEEN WIND POWER AND PUMPED-STORAGE POWER STATION

    Institute of Scientific and Technical Information of China (English)

    王睿; 张粒子; 张丽娟; 徐利美

    2012-01-01

    Based on integrated policy and planning research, an optimization model was executed by genetic algorithm , which combines setting the maximization of social benefits as objective function and studying the optimal capacity of wind power and pumped-storage power station. The simulation results indicate that it can promote the development of wind power and improve the energy utilization efficiency of power systems. The way has practical significance for ascertaining optimize capacity of wind power and pumped-storage power station.%基于宏观层面政策、规划研究应用的研究定位,以社会效益最大化为目标建立风电-抽水蓄能联合运行优化模型,研究含风电场系统风电与抽水蓄能的最优匹配容量问题,并采用嵌套式遗传算法进行优化仿真分析,仿真结果表明风电与抽水蓄能的合理配置可促进风电发展,实现社会效益的显著提高.该文给出的确定风电与抽水蓄能最优匹配容量的方法具有一定的实践意义.

  15. Frequency-Adaptive Modified Comb-Filter-Based Phase-Locked Loop for a Doubly-Fed Adjustable-Speed Pumped-Storage Hydropower Plant under Distorted Grid Conditions

    Directory of Open Access Journals (Sweden)

    Wei Luo

    2017-05-01

    Full Text Available The control system of a doubly-fed adjustable-speed pumped-storage hydropower plant needs phase-locked loops (PLLs to obtain the phase angle of grid voltage. The main drawback of a comb-filter-based phase-locked loop (CF-PLL is the slow dynamic response. This paper presents a modified comb-filter-based phase-locked loop (MCF-PLL by improving the pole-zero pattern of the comb filter, and gives the parameters’ setting method of the controller, based on the discrete model of MCF-PLL. In order to improve the disturbance resistibility of MCF-PLL when the power grid’s frequency changes, this paper proposes a frequency-adaptive modified, comb-filter-based, phase-locked loop (FAMCF-PLL and its digital implementation scheme. Experimental results show that FAMCF-PLL has good steady-state and dynamic performance under distorted grid conditions. Furthermore, FAMCF-PLL can determine the phase angle of the grid voltage, which is locked when it is applied to a doubly-fed adjustable-speed pumped-storage hydropower experimental platform.

  16. 大型抽水蓄能机组热工保护设置与应用%Setting and Application of Thermal Protections for Large Pumped-storage Power Units

    Institute of Scientific and Technical Information of China (English)

    彭煜民

    2012-01-01

    The unit of pumped -storage power station will be run in many different conditions and switched between them frequently. The thermal protections have important roles on the normal operation of units and the mitigation of accidents. The thermal protections, including temperature protection, pressure and pressure difference protection, flow protection, liquid level protection, displacement/position protection, vibration protection, over-speed protection and powerhouse flooded protection, are analyzed in detail herein. The experiences can be as references to the design of other pumped-storage power stations.%抽水蓄能电站机组运行工况多且工况转换频繁,热工保护对机组正常运行、避免扩大事故有着举足轻重的作用.对热工保护中的温度保护、压力压差保护、流量保护、液位保护、位移(位置)保护、振动保护、过速保护及水淹厂房等保护做了详细的分析与说明,可供其他抽水蓄能电站进行热工保护设计时借鉴.

  17. 抽水蓄能电站建设财务管理应注意的问题%Financial Management in the Construction of Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    马善忠; 陈春晓; 黄皖红

    2012-01-01

    Bailianhe Pumped-storage Power Station is one of key projects in China's Eleventh Five-Year Plan with longer construction period, large amount of investment and various types of equipments. By strengthening financial management and focusing on the capital management, cost accounting and process supervision during project construction, Hubei Bailianhe Pumped Storage Company has effectively lowered project cost, avoided the capital risk and saved project investment.%白莲河抽水蓄能电站工程建设周期较长、投资大、设备种类繁多,是国家“十一五”时期重点工程项目.湖北白莲河抽水蓄能有限公司在建设中通过加强基建财务管理,注重基建资金管理、会计核算和过程监督,有效地降低工程造价,规避了资金风险,节省了工程投资.

  18. Research of Charging Scheme for Upper Reservoir of High Head Pumped-storage Power Station%高水头蓄能电站上库充水方案研究

    Institute of Scientific and Technical Information of China (English)

    曲梦泽

    2015-01-01

    The water charging modes for upper reservoir of pumped-storage power station are summarized and the hydraulic losses of flow regulating devices of gate valve, butterfly valve, flow control valve and orifice plate are analyzed and compared. It is concluded that the charging pump can safely operate in whole head range by selecting a certain number of orifice plates and installing an appropriate flow control valve. The case calculation shows that the charging pump can safely operate in suitable range when the orifice plates are used.%对抽水蓄能电站上库充水方式进行了总结,对闸阀、蝶阀、流量调节阀和孔板等管路流量调节元件的水力损失进行了分析比较,认为根据充水泵所允许的最小扬程和最大流量,选取数枚适用孔板,配套安装一台流量调节阀,可保证充水泵在全部几何扬程范围内安全运行。实例计算表明,推荐使用孔板能保证充水泵在合适的区域内运行。

  19. 风电-火电-抽水蓄能联合优化机组组合模型%Unit Commitment Model for Combined Optimization of Wind Power-Thermal Power-Pumped Storage Hydro

    Institute of Scientific and Technical Information of China (English)

    刘芳; 潘毅; 杨军峰; 周劼英; 周京阳; 朱泽磊; 李强

    2015-01-01

    大规模间歇式能源出力的不确定性给电网的安全经济运行提出新的挑战,研究间歇式能源接入下的多源联合优化机组组合模型对提高电网运行的安全性和促进间歇式能源的消纳具有重要意义。基于对风电不确定性及抽水蓄能运行机理分析,采用置信区间法进行风电不确定性建模,并提出新的系统调节能力约束,从而建立了考虑风电不确定性影响及抽蓄水头变化影响的联合优化机组组合模型。采用6节点系统验证模型的有效性,研究了抽蓄容量及置信区间选择对发电成本、机组组合及其可靠性的影响。结果显示,风电、火电装机不变的情况下,要保证机组组合的可靠性达99%以上,抽蓄发电装机占比分别为5.6%和10.5%时,与无抽蓄时相比可以分别减少16和17个开机时段,发电成本可以分别降低4.6%和6.8%。通过算例的论证,表明该机组组合模型能够实现多元能源的协调优化和给定置信区间内的风电的有效消纳。%The uncertainty of large-scale intermittent energy poses new challenges to grid operation, it is important to study unit commitment model for combined optimization of multi-source with intermittent energy to improve operation security and promote the utilization of intermittent energy. Based on analysis of the uncertainty of wind power and operational mechanism of pumped storage, this paper used confidence interval method to model the uncertainty, and proposed new constraints about system adjustment ability to establish unit commitment model considering wind power’s uncertainty and changes in pumped storage water head. This paper used a 6-node system to verify effectiveness of the model, and studied the impacts of pumped storage capacity and confidence interval on generation cost, unit commitment and its reliability. When the installed capacity of both wind and thermal power is fixed and the reliability of unit

  20. Thermodynamic analysis of active heat storage-release associated with heat pump heating system in greenhouse%温室主动蓄放热-热泵联合加温系统热力学分析

    Institute of Scientific and Technical Information of China (English)

    孙维拓; 张义; 杨其长; 方慧; 卢威; 胡永逵

    2014-01-01

    主动蓄放热-热泵联合加温系统加温和节能效果显著,在温室加温领域应用前景广阔,但系统技术参数及工艺仍有待优化。该文通过对系统进行能量平衡和可用能(Exergy)分析,得出系统及各组件的性能系数、可用能损失、损失比和可用能效率,以此为依据对系统进行性能评价和优化。试验结果表明:系统平均1d中集热和保温阶段可用能损失总量为9.77×104 kJ,可用能效率为48.7%;可用能损失最大、可用能效率最低的组件是主动蓄放热装置,其次是热泵装置、循环水泵和蓄热水箱,其可用能损失比分别为78.7%、8.3%、7.7%、5.3%,可用能效率分别为25.6%、38.3%、75.0%、88.2%。就整个系统而言,最需要进行技术优化的是主动蓄放热装置与热泵装置,可用能损失主要由有限温差传热引起,降低传热温差、减少有限温差传热过程以及改进生产工艺是优化的重点。试验期间系统的集热效率为89.0%~100.5%,热泵装置制热性能系数(coefficient of performance,COPHp)达5.48~6.08,性能远远高于传统太阳能热水系统以及水、地源热泵。该研究为温室加温系统性能评价和优化设计提供思路。%Active heat storage-release associated with heat pump heating system (AHSRHPS) has remarkable heating and energy-saving effects, which use the same principle as an indirect-expansion solar heat pump, while allowing the technical parameters and processes to continue to improve. The system in this study was designed and constructed in the experimental glass greenhouse at the Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences. The main objective was to investigate performance evaluation and thermoeconomic analysis of AHSRHPS for greenhouse heating in the winter. This included the exergy loss of the system and components, defining the specific locations and

  1. A Method to Evaluate Comprehensive Benefits of Hybrid Wind Power-Pumped Storage System%风电-抽水蓄能联合系统综合效益评价方法

    Institute of Scientific and Technical Information of China (English)

    肖白; 丛晶; 高晓峰; 谷禹

    2014-01-01

    In allusion to restricted grid-connected capacity and high wind power curtailment when large-scale wind farm is grid-connected, in usual it is considered to improve power grid’s ability of accommodating wind power by energy storage system, however how to evaluate the overall efficiency of the hybrid wind power-pumped storage system is the problem to be solved well. For this reason, the investment cost, economic benefit of pumped storage system and its operational constraints are analyzed, thus the follow-up mechanism between comprehensive benefits of hybrid wind power-pumped storage system and energy storage capacity under optimized operating condition of regional power grid is revealed, and a mathematical model to solve the comprehensive benefits is established and a method to evaluate the comprehensive benefits is proposed. Based on output curves of mutually matched thermal generation units, wind power and load characteristics of power grid and combining with the installation capacity of thermal generation units and utilizing the incidence relation between system frequency and load (or the change of power generation), the proposed method quantitatively analyzes the impacts of the change of such factors of pumped storage station as its capacity, service life, cost and revenue on comprehensive benefits and power grid’s accommodation ability of wind power. Case analysis shows that proposed evaluation method is effective.%面对大规模风电并网运行时接入容量受限、弃风量大的情况,通常的做法是考虑利用储能系统来提高电网接纳风电能力,但如何评价其整体效益是必须解决好的问题。为此分析了抽水蓄能系统的投资成本、经济效益及其运行约束,揭示了风电-抽水蓄能联合系统综合效益和储能容量之间在地区电力系统最优化运行条件下的随动机理,建立了求取综合效益的数学模型,提出了综合效益的评价方法。该方法基于相互匹配

  2. A concept of an electricity storage system with 50 MWh storage capacity

    OpenAIRE

    Józef Paska; Mariusz Kłos; Paweł Antos; Grzegorz Błajszczak

    2012-01-01

    Electricity storage devices can be divided into indirect storage technology devices (involving electricity conversion into another form of energy), and direct storage (in an electric or magnetic fi eld). Electricity storage technologies include: pumped-storage power plants, BES Battery Energy Storage, CAES Compressed Air Energy Storage, Supercapacitors, FES Flywheel Energy Storage, SMES Superconducting Magnetic Energy Storage, FC Fuel Cells reverse or operated in systems with electrolysers an...

  3. 主动蓄放热-热泵联合加温系统在日光温室的应用%Application of heating system with active heat storage-release and heat pump in solar greenhouse

    Institute of Scientific and Technical Information of China (English)

    孙维拓; 杨其长; 方慧; 张义; 管道平; 卢威

    2013-01-01

    The Chinese solar greenhouse has a unique greenhouse structure that regards solar energy as the main energy source, and has characteristics such as high efficiency, energy saving, and low cost. During a cold winter night, air temperature inside a solar greenhouse is low for crop growth, which would affect crop yield and quality, due to the heat-transfer characteristics and heat capacity limit of the north wall. In recent years, in trying to promote the heat storage capacity of the solar greenhouse, the thought of active heat storage-release came forward. Solar energy is a kind of clean renewable energy, but has intermittent and unstable performance when used for greenhouse heating. Meanwhile, the heat collecting efficiency of the solar thermal collector decreases with an increase in operating temperature. Thus, an active heat storage-release system (AHSRS) is difficult to use to ensure an appropriate temperature for a solar greenhouse in a frigid region or when it encounters weather conditions with weak solar radiation. As an efficient means of raising low-grade energy, the heat pump has been more and more applied to greenhouse heating which can reduce the operating temperature of the AHSRS when used in combination. In order to promote heating performance and stability of the AHSRS and improve air temperature inside a solar greenhouse at night, based on the concept of active heat storage-release, an active heat storage-release associated with heat pump heating system (AHSRHPS) applicable to solar greenhouse heating was designed in the present study. During the day, the solar energy reaching the north wall surface was absorbed by the circulating water and stored in reservoirs when the AHSRS was running. Running the heat pump unit was intended to promote low-grade heat energy and reduce the circulating water temperature which contributes to increasing the heat collecting efficiency of the AHSRS and maximum water temperature of the reservoir. When air temperature

  4. Magnetocaloric pump

    Science.gov (United States)

    Brown, G. V.

    1973-01-01

    Very cold liquids and gases such as helium, neon, and nitrogen can be pumped by using magnetocaloric effect. Adiabatic magnetization and demagnetization are used to alternately heat and cool slug of pumped fluid contained in closed chamber.

  5. An economic evaluation comparison of solar water pumping system with engine pumping system for rice cultivation

    Science.gov (United States)

    Treephak, Kasem; Thongpron, Jutturit; Somsak, Dhirasak; Saelao, Jeerawan; Patcharaprakiti, Nopporn

    2015-08-01

    In this paper we propose the design and economic evaluation of the water pumping systems for rice cultivation using solar energy, gasoline fuel and compare both systems. The design of the water and gasoline engine pumping system were evaluated. The gasoline fuel cost used in rice cultivation in an area of 1.6 acres. Under same conditions of water pumping system is replaced by the photovoltaic system which is composed of a solar panel, a converter and an electric motor pump which is compose of a direct current (DC) motor or an alternating current (AC) motor with an inverter. In addition, the battery is installed to increase the efficiency and productivity of rice cultivation. In order to verify, the simulation and economic evaluation of the storage energy battery system with batteries and without batteries are carried out. Finally the cost of four solar pumping systems was evaluated and compared with that of the gasoline pump. The results showed that the solar pumping system can be used to replace the gasoline water pumping system and DC solar pump has a payback less than 10 years. The systems that can payback the fastest is the DC solar pumping system without batteries storage system. The system the can payback the slowest is AC solar pumping system with batteries storage system. However, VAC motor pump of 220 V can be more easily maintained than the motor pump of 24 VDC and batteries back up system can supply a more stable power to the pump system.

  6. Heat pumps

    CERN Document Server

    Macmichael, DBA

    1988-01-01

    A fully revised and extended account of the design, manufacture and use of heat pumps in both industrial and domestic applications. Topics covered include a detailed description of the various heat pump cycles, the components of a heat pump system - drive, compressor, heat exchangers etc., and the more practical considerations to be taken into account in their selection.

  7. Wind-energy storage

    Science.gov (United States)

    Gordon, L. H.

    1980-01-01

    Program SIMWEST can model wind energy storage system using any combination of five types of storage: pumped hydro, battery, thermal, flywheel, and pneumatic. Program is tool to aid design of optional system for given application with realistic simulation for further evaluation and verification.

  8. Heat pumps

    CERN Document Server

    Brodowicz, Kazimierz; Wyszynski, M L; Wyszynski

    2013-01-01

    Heat pumps and related technology are in widespread use in industrial processes and installations. This book presents a unified, comprehensive and systematic treatment of the design and operation of both compression and sorption heat pumps. Heat pump thermodynamics, the choice of working fluid and the characteristics of low temperature heat sources and their application to heat pumps are covered in detail.Economic aspects are discussed and the extensive use of the exergy concept in evaluating performance of heat pumps is a unique feature of the book. The thermodynamic and chemical properties o

  9. 蓄能型太阳能热泵热水器性能系数的分析%Coefficient of performance of solar heat pump water heater with energy storage

    Institute of Scientific and Technical Information of China (English)

    吴薇; 卫梁彦; 程清; 王玲珑

    2011-01-01

    To solve the problem that solar heat pump water heater was prone to be affected by weather, a novel water heater integrated with collection, storage and evaporation was proposed. The principle, characteristics, operating modes and structure of the collector-storage-evaporator system were investigated. Using phase change material of decanoic acid to store solar radiation in sunny days as low-temperature source, hot water was produced at night or in continuous rainy days. Thermal efficiency of heat pump system was increased significantly, and the operating unstableness of the heat pump system caused by interval solar energy was also solved. Experiments under different conditions and operating modes in spring were conducted, and the coefficient of performance ( COP) of the system was analyzed. The results indicate that COP of this novel solar heat pump water heater with energy storage is higher than that of ordinary solar heat pump water heater at the same weather condition. The average COP of this system is 7. 56 with maximum of 8. 9 for average solar radiation of 592 W·m-2. COP can also reach 6.4 even at night, which means that weather has slight influence on COP.%针对太阳能热泵热水器受天气变化影响的问题,提出了一种新型的集热-蓄能-蒸发一体化太阳能热泵热水器,给出了系统的原理、特点、运行模式和集热-蓄能-蒸发器的结构形式,以癸酸为相变材料储存晴天的太阳辐射能,作为热泵在夜间和连续阴雨天时的低温热源制得热水,提高了热泵的制热效率,解决了太阳能间歇性所造成的系统运行不稳定的问题.进行了春季不同工况、不同工作模式的试验,分析了系统的性能系数COP,得出该系统的平均COP为7.56.太阳辐射强度均值为592 W·m-2的天气条件下,COP可达8.9;即使在夜间,COP仍能达到6.4,均高于相同天气条件下普通太阳能热泵热水器的COP,该系统的COP受天气变化影响较小.

  10. 抽水蓄能机组背靠背启动中跳闸技术改造方案%Transformation on the Fault Trip during Back-to-back Starting of Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    常永亮; 张兵海; 王勇; 何忠华

    2011-01-01

    针对抽水蓄能机组在背靠背拖动过程中若发生电气或机械故障跳闸,当跳开拖动机组和被拖动机组的灭磁开关的时间差过大时,会在启动回路中产生很大的短路电流,引起继电保护误动作,严重时会损毁启动回路的电气设备,提出一种抽水蓄能机组背靠背跳闸技术改造方案,通过在机组保护系统中添加“跳相邻机组单元”接点,与“跳本机组”接点同时动作,达到同时跳开拖动和被拖动机组灭磁开关的目的.技术改造后的试验证明了方案的正确性和有效性.%When the trip is occurred during the back-to-back starting of pumped-storage units as electrical or mechanical faults and there is a larger time difference between the field breaking switches, the large short -circuit current will be generated in the starting circuits and leads to the malfunction of relay protection, even to damage the electrical equipments of starting circuit in a severe condition. A trip transformation was presented for the back-to-back starting of pumped-storage units, in which, the contact of "Breaking adjacent unit" was added in protection system and will be simultaneously operated with the contact of "Breaking local unit" to meet the requirements on breaking the units on the same time. The tests show that the transformation program is effective.

  11. 水源热泵与蓄能结合系统的评价体系研究%Evaluation methods of water-source heat pump systems combined with thermal storage

    Institute of Scientific and Technical Information of China (English)

    白雪莲; 张南桥

    2011-01-01

    针对水源热泵和冰蓄冷的技术特点,确定了水源热泵与蓄能结合的系统的评价指标.对系统的经济性、节能性、安全性、环境效益、特性进行分析,提出该系统的综合评价体系.采用模糊综合评价方法,建立了评价模型,并得到相应的评价步骤.结合工程实例,分析了综合评价体系的应用结果,研究表明,综合评价体系可以全面反映该系统的特性,为方案决策和系统设计提供了量化依据.%Aiming at the characteristics of water-source heat pump and ice storage, determines the evaluation indices for the system of water-source heat pump combined with thermal storage. Analysing economic effects, energy saving, safety, environment benefits and exergy characteristics, puts forward a comprehensive evaluation method for the system. Adopting fuzzy comprehensive evaluation method, sets up an evaluation model and presents corresponding steps. Taking an actual project as example, analyses the application results of the evaluation method. The results show that the evaluation method can reflect totally the characteristics of the system and provide quantitative reference for scheme decision and system design.

  12. Foundation Excavation Technology of Inlet/Outlet of Lower Reservoir in Xianju Pumped-storage Power Station%仙居抽水蓄能电站下水库进出水口基坑开挖技术

    Institute of Scientific and Technical Information of China (English)

    贾群超; 卢瑶; 陈金

    2014-01-01

    通常情况下,抽水蓄能电站下水库进出水口施工前期,多为静水中填筑土石高围堰,然后在围堰的挡护下进行下水库进出水口基坑施工,由于进出水口基坑狭小,边坡高陡,且周边已建设施较多,同时又受汛期影响,工期紧张。基坑开挖是进水口施工的首要工序,尤为重要,通过对仙居抽水蓄能电站下水库进出水口基坑开挖进行研究,总结了其开挖技术要点。%Under the normal circumstances, at the construction earlier stage of inlet / outlet of lower reservoir in Xianju Pumped-storage Power Station, in the ordinary course, the debris high cofferdam will be filled still in the water. The foundation excavation of inlet / outlet of lower reservoir is constructed under the cofferdam protection. Because of the narrow inlet and outlet foundation excavation, high and steep slope,many surrounding infrastructure facilities,meanwhile combined with the influence of the flood season, the construction period is very tight. The foundation excavation is the first step in the inlet / outlet construction. Through the research of foundation excavation technology of inlet / outlet of lower reservoir in Xianju Pumped-storage Power Station,the excavation key points are summarized.

  13. Study on energy-storage efficiency of xenon flash-lamp pumped Nd: glass amplifier%氙灯泵浦钕玻璃放大器储能效率研究

    Institute of Scientific and Technical Information of China (English)

    罗亦鸣; 刘建国; 陈林; 郝欣; 王正辉; 刘勇; 陈远斌

    2013-01-01

    The courses of the energy transfer from electricity to the Nd:glass disk were numerically analyzed,such as electricity-light conversion of Xenon flash lamp,cavity transformation,the absorbing of pump-light converting to the laser-energy level and decay.The theoretical and experimental results show that the boosting of energy-storage efficiency of the flash-lamp pumped Nd.:glass amplifier should be achieved by means of improving the material,design and fabrication of the amplifier and its power conditioning system.%按照激光放大器能量传输和转化过程,利用激光速率方程和氙灯辐射方程、光线追迹软件等理论方法和分析计算工具,对氙灯泵浦钕玻璃激光放大器进行储能效率和能量转换环节的理论分析以及定量、半定量计算,系统分析各种能量转化与损耗因素对放大器储能效率的影响.理论研究的成果与放大器实验考核的结果相一致.

  14. 响水涧抽水蓄能电站下水库围堤基础渗水处理技术%Seepage Treatment on Border Dike Foundation of Lower Reservoir in Xiangshuijian Pumped Storage Station

    Institute of Scientific and Technical Information of China (English)

    段琳; 占小星; 胡瑶

    2012-01-01

    响水涧抽水蓄能电站下水库围堤基础开挖后,西侧围堤边坡出现两处大面积渗水现象,对围堤黏土填筑施工质量影响很大.结合工程实际及工期要求,通过方案比选,确定采取“反滤排水、集中抽排、混凝土封堵”方案,并详细介绍施工工序和控制要点.经过3年工程运行情况表明,该段围堤安全稳定,其处理效果满足设计要求.%The west side slope of lower reservoir in Xiangshuijian pumped storage station appeared two large seepage areas after border dike foundation of lower reservoir excavation. It has a great influence on clay filling quality of border dike. In consideration of construction condition and time requirement, the method of antifiltering drainage, concentrative pumping and drainage and plugging by concrete is adopted by schemes selection, and the construction process and control points are introduced in detail. The operation condition shows that the border dike is safe and sable, the effect of treatment meets the requirements of design.

  15. Centrifugal pumps

    CERN Document Server

    Gülich, Johann Friedrich

    2014-01-01

    This book gives an unparalleled, up-to-date, in-depth treatment of all kinds of flow phenomena encountered in centrifugal pumps including the complex interactions of fluid flow with vibrations and wear of materials. The scope includes all aspects of hydraulic design, 3D-flow phenomena and partload operation, cavitation, numerical flow calculations, hydraulic forces, pressure pulsations, noise, pump vibrations (notably bearing housing vibration diagnostics and remedies), pipe vibrations, pump characteristics and pump operation, design of intake structures, the effects of highly viscous flows, pumping of gas-liquid mixtures, hydraulic transport of solids, fatigue damage to impellers or diffusers, material selection under the aspects of fatigue, corrosion, erosion-corrosion or hydro-abrasive wear, pump selection, and hydraulic quality criteria. As a novelty, the 3rd ed. brings a fully analytical design method for radial impellers, which eliminates the arbitrary choices inherent to former design procedures. The d...

  16. 西北地区发展抽水蓄能电站的意义与面临的主要问题%Signif icance and Issues of Pumped Storage Power Plants to be Developed in West China

    Institute of Scientific and Technical Information of China (English)

    冯黎; 王社亮

    2014-01-01

    西北地区是中国规划的千万千瓦级风电及光电基地之一,促进西北地区风能与太阳能开发利用对实现中国能源发展战略具有重要的意义。而配置抽水蓄能电站是增强电网接纳风电光电能力的重要措施。文章介绍了西北地区风能、太阳能资源发展规划,分析了风电与光电并网存在的主要问题及抽水蓄能电站对促进风电与光电消纳的重要作用,并针对目前西北地区抽水蓄能电站发展过程中存在的主要问题,提出了促进措施和建议。%West China is one of the wind-solar energy bases with the installed capacity of exceeding tens of thousands of megawatt planned in China.It is significant for the energy development strategy of China to promote the development and utilization of the wind-solar energy in west China.But, the introduction of the pumped storage power plant into the grid is the important measures to enhance the grid capaci-ty of accepting the wind-solar power.In the paper, the development plan for the wind-solar energy in west China is introduced;major is-sues on the wind-solar power into the grid as well as the significance of the pumped storagepower plant for the promotion of the accept-ance and consumption of the wind-solar power are analyzed.Furthermore, the promoting measures and suggestions are raised aiming at the major issues in the development of the pumped storage power plant in west China.

  17. Compound Floor Radiant Heating System of Solar Energy, Heat Pump and Phase Change Energy Storage%太阳能热泵相变储能复合地板辐射采暖系统

    Institute of Scientific and Technical Information of China (English)

    王长宁

    2016-01-01

    太阳能地板辐射采暖系统与相变储能技术结合使用是新能源利用的一种重要方法。介绍了一种太阳能、热泵、低谷电辅热与相变储能地板联合运行的复合地板辐射采暖系统;讨论了系统组成、运行原理以及运行流程;分析了该采暖系统在节能环保、室内热舒适性等方面的优点;展望了其良好的发展前景。%Combing solar radiant floor heating system with phase change energy storage technology is an important method of new energy utilization. A compound floor radiant heating system of solar energy, heat pump, off-peak electricity and phase change energy storage is introduced. The system composition, working principle and operation process are discussed. Advantages of the heating system in the aspects of energy saving, environmental protection, indoor thermal comfort are analyzed. Moreover, a view of good ap-plication prospect is presented.

  18. Experimental Research on Multi-source Solar Energy and Air Source Heat Pump System with Serpentine Tube Energy Storage Exchangers%蓄能型蛇形管太阳能——空气源复合热泵系统实验研究

    Institute of Scientific and Technical Information of China (English)

    陈杨华; 彭辉; 郭文帅; 李钰; 陈非凡

    2013-01-01

    蛇形管蓄能型太阳能——空气源复合热泵系统结合了空气源热泵技术、太阳能利用技术和蓄能技术三者的优点,是一种高效新型的热泵系统.在搭建好实验台后,通过实验分析了该系统在常规空气源热泵供热模式、蓄冷模式、取冷模式、蓄能热泵供热模式、边蓄热边供热模式下的性能特性.实验结果证明蓄能型蛇形管太阳能——空气源复合热泵系统运行高效、安全、稳定可靠.%Multi-source solar energy and air source heat pump system with serpentine tube energy storage exchanges combine the advantages of air source heat pump, solar energy utilization technology and energy storage technology. It is a new high-efficiency heat pump system. After setting up experimental station, the performance characteristics of the system is analysed when conventional air source heat pump heating mode, cold storage mode, cold release mode, heating mode using heat storage, heat storage and heat release using solar heat pump mode is operated. Experimental results show that the system is efficient, safe, stable and reliable.

  19. ENERGY ANALYSES AND EXPERIMENT ON SOLAR-GROUND COUPLED HEAT PUMP WITH SEASONAL STORAGE SYSTEM%太阳能、蓄热与地源热泵组合系统能量分析与实验

    Institute of Scientific and Technical Information of China (English)

    李新国; 胡晓辰; 王健

    2012-01-01

    在天津地区设计建成太阳能、蓄热与地源热泵组合系统(SGCHPSS),实现建筑物供暖、空调、供热水三联供.对组合系统运行模式进行研究,在TRNSYS平台上模拟得到太阳能、地表能的组合、匹配利用关系,及两种热源对整个系统的能量贡献;模拟得到4~7月份太阳能向地下土壤的跨季节蓄热量.进行示范工程实验,得到土壤跨季节蓄热与地源热泵系统全年运行情况,并进行全年土壤热平衡与系统能耗分析.%A Solar-Ground Coupled Heat Pump with Seasonal Storage (SGCHPSS) system was set up,which used solar and geothermal to supply the heating,air-conditioning,and hot water for building.Operation mode's analyses on the SGCHPSS system was carried out.With TRNSYS plateform,the energy combination and matching relationships between solar and geothermal,and their contribution to the SGCHPSS system,and the seasonal energy storage from April to July were obtained.The experiment on solar seasonal storage,and the annual energy balance in soil were obtained.

  20. Performance Evaluation of a HP/ORC (Heat Pump/Organic Rankine Cycle) System with Optimal Control of Sensible Thermal Storage

    DEFF Research Database (Denmark)

    Carmo, Carolina; Nielsen, Mads P.; Elmegaard, Brian

    2016-01-01

    In energy systems with high share of renewable energy sources, like wind and solar power, it is paramount to deal with their intrinsic variability. The interaction between electric and thermal energy (heating and cooling) demands representa potential area for balancing supply and demand that could...... of the users. Results show that real load control logic can lessen the adverse effects ofcycling in the compressor of the system as well as increase the thermal demand (up to 33%) and the electrical demand (max. 8.4%) covered by renewable energy (solar). However, the extension of these improvements is highly...... come to contribute to the integration of intermittent renewables.This paper describes an innovative concept that consists of the addition of an Organic Rankine Cycle (ORC) toa combined solar system coupled to a ground-source heat pump (HP) in a single-family building. The ORC enables the use of solar...

  1. Smart intermittency-friendly cogeneration: Techno-economic performance of innovative double storage concept for integrating compression heat pumps in distributed cogeneration

    DEFF Research Database (Denmark)

    Blarke, Morten

    2011-01-01

    cogeneration plants rather than central power plants are giving way for wind power in the electricity mix. Could intermittent renewables be a threat to the system-wide energy, economic and environmental benefits that distributed cogeneration have to offer? This paper investigates how existing cogeneration......Increasing penetration levels of intermitttent renewables are posing challenges to system operators and electricity producers. In West Denmark, which is a paradigmatic case by global comparison in terms of combining intermittent renewables and distributed cogeneration, we find that distributed...... plants may adapt their plant design and operational strategy to improve the co-existence between cogeneration and intermittent renewables. A novel intermittency-friendly and super-efficient concept in cogeneration is presented that involves integrating a high-pressure compression heat pump using heat...

  2. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches: UPH. Appendix A: Upper reservoir

    Science.gov (United States)

    1981-04-01

    Overriding considerations including operating range, volume and lining of reservoir, embankment design, intake/outlet arrangements and filling and make up water provisions were studied within the context of minimizing facility costs and optimizing the plant layout. The study led to the selection of a reservoir formed by embankment of compacted rockfill together with an intake/outlet structure located in the embankment. The reservoir floor and upstream slopes of the embankment will have an asphalt lining to prevent leakage. The material and cost estimates presented are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage with a nominal head of 4600 ft.

  3. Ferroelectric Pump

    Science.gov (United States)

    Jalink, Antony, Jr. (Inventor); Hellbaum, Richard F. (Inventor); Rohrbach, Wayne W. (Inventor)

    2000-01-01

    A ferroelectric pump has one or more variable volume pumping chambers internal to a housing. Each chamber has at least one wall comprising a dome shaped internally prestressed ferroelectric actuator having a curvature and a dome height that varies with an electric voltage applied between an inside and outside surface of the actuator. A pumped medium flows into and out of each pumping chamber in response to displacement of the ferroelectric actuator. The ferroelectric actuator is mounted within each wall and isolates each ferroelectric actuator from the pumped medium, supplies a path for voltage to be applied to each ferroelectric actuator, and provides for positive containment of each ferroelectric actuator while allowing displacement of the entirety of each ferroelectric actuator in response to the applied voltage.

  4. Optimal Operation Model for Wind Power-Pumped Storage Power Station and Case Study for Hebei South Power Grid%风电-抽水蓄能系统优化运行建模与河北南网案例分析

    Institute of Scientific and Technical Information of China (English)

    高丹; 胡三高; 范辉; 蒋东方; 徐鸿; 唐宝峰

    2011-01-01

    以风电入网时与储能电站联合运行方式为背景,以得到协调运行控制策略为目的,拟定了风电-抽水蓄能联合系统的3种运行方案:风电全部通过抽水蓄能发电来实现并网;电网允许一个较小的基准容量的风电直接并网,其余风电通过抽水蓄能来实现并网;电网允许一个较大的基准容量的风电直接并网,其余风电通过抽水蓄能来实现并网.分析了风电机组不同典型日的运行曲线,结果表明:不同运行方式对抽水蓄能电站的协调运行控制策略影响不同,抽水蓄能电站作用取决于电站规模,并给出了联合运行系统的协调控制基本原则.%As to the combined operation mode with grid-connected wind power and energy storage station, three feasible operation schemes for wind power-pumped storage system are proposed to get coordinated control strategy. The scheme Ⅰ is that all of wind power is transmitted to power grid through pumped storage plants. Scheme Ⅱ is that small part of wind power is directly transmitted to power grid,while the rest is transmitted to power grid through pumped storage plants. Scheme Ⅲ is that a large part of wind power is directly transmitted to power grid, the rest is transmitted to power grid through pumped storage plants. From the analysis on operating curve of different classical dates for a wind turbine, it is shown that different operating modes have different influence on coordinated operation control strategies of pumped storage power plant, the effect of pumped storage power station depends on its scale, and the basic principle of coordinated control for combined operating system is given.

  5. 350MW级蓄能机组可倾瓦导轴承流体动力润滑计算%Calculation of hydrodynamic lubrication of tilting pad guide bearing for 350 MW pumped-storage units

    Institute of Scientific and Technical Information of China (English)

    范寿孝; 全日光; 朱亲林

    2015-01-01

    为了解决大型抽水蓄能机组可倾瓦导轴承性能计算的问题,笔者根据流体润滑理论,建立了大型可倾瓦导轴承的流体动力润滑数学模型,设计了计算程序,并以此程序对某350 MW级抽水蓄能机组的导轴承润滑性能进行了计算分析和研究.其结果表明,大型可倾瓦导轴承的流体动力润滑计算程序运行稳定可靠,导轴承的动力润滑性能会受到轴承负荷、机组转速、油槽进油温度等因素的影响,最高油膜温度、最小油膜厚度是制约轴承运行工况参数变化范围的关键因素.%In order to solve the calculation problem of the tilting pad guide bearing for large pumped-storage u-nits, according to hydro lubricating theory, the author established the hydrodynamic lubricating mathematical model of the tilting pad guide bearing and analyzed and studies the hydrodynamic lubrication of a 350 MW pumped-stor-age unit by the designed calculation program. The result shows that the calculation program operates stably and reli-ably. Besides, the lubricating character of guide bearing is affected by factors including bearing load, unit speed and inlet oil temperature of oil tank. The maximum oil film temperature and the minimum oil film thickness become the critical factor restricting the variation range of operating parameters.

  6. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches. UPH. Appendix E: Lower reservoir

    Science.gov (United States)

    1981-04-01

    Operational, construction, and geotechnical requirements were examined. Overriding considerations including operating range, volume, construction methods, cavern cross section and reservoir layout were studied within the context of minimizing facility costs and optimizing the plant layout. The study led to a preliminary arrangement of fourteen parallel caverns, each 60 ft wide by 85 ft high in cross section and 3610 ft in length. The requirements for and preliminary design of the intermediate reservoir in the case of a two step UPH facility is also described. The design and the cost estimates presented are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage at a nominal head of 4600 ft.

  7. The Presentation of a Two Stages Model for an Optimum Operation of a Hybrid System of Wind-Pumped Storage Power Plant in the Power Market Environment

    Directory of Open Access Journals (Sweden)

    Mehdi Akbarpour

    2012-11-01

    Full Text Available In this study we present a new method in power market environment. One of the weaknesses in the utilization of wind units is severe dependence of output power level on wind. However, considering the high uncertainty in the prediction of wind speed and wind forecast unit production capacity is also having an error. Also, regarding to the uncontrollable generators of this type, it is better to use combined systems for utilization. This study presents a new model based on the a two stage for an optimum operation of a hybrid system of windpumped storage power plant in the power market environment that causes to provide a successful presentation condition in market environments for the producers of wind power. In the suggestive hybrid system of windpumped storage power plant of this study the modeling is done in two stages for the optimum presence in power market environment with the a most possible benefit. At first, the suggestive model is optimized regarding to uncertainty in the prediction of power price and producing the wind power, for presenting the suggestion of power to market, in order to gain the most benefit. At the second stage, the suggestive model is optimized regarding to uncertainty in producing wind power, in order to gain the most benefit and paying the least penalty for unbalancing in market for operation of the system. In this study, the Particle Swarm Optimization algorithm (PSO is used for optimization. At the end of a model example for applying the results of the proposed model will be examined and analyzes the results. Results show that the model is an appropriate method for the operation of this combined system in market environment.

  8. 张河湾电站垫层料变形模量试验研究%Experimental Study on Deformation Modulus of Bedding Materials in Zhanghewan Pumped-Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    邹武; 包磊; 刘琼; 陈建飞

    2011-01-01

    Deformation modulus is an important indicator to measure the mechanical properties of geotechnical engineering. After excavating the reservoir slope on Hebei Zhanghewan Pumped-Storage Power Station,all weathered sandstone outcropped a lot, bedrock cracked and jointly developed, which made a big impact on the stability of asphalt concrete panel and reservoir bank base. By testing the particle size distribution, density,moisture content, penetration and deformation modulus of the filled bedding materials for ditch dam No. 5 of the reservoir on Zhanghewan Pumped-storage Power Station, we have checked the carrying and deformation resisting capacity of bedding materials,futher understood their stress-strain characteristics and thus provided a scientific basis for the analysis of safety and stability of the dam bedding materials.%变形模量是衡量岩土工程力学特性的一个重要指标,现场压板荷载试验计算变形模量是最直接有效的方法.河北张河湾抽水蓄能电站上水库边坡施工开挖后全强风化细砂岩出露较多,基岩裂隙和节理发育,对沥青混凝土面板和库岸基础的稳定性影响较大,通过对张河湾抽水蓄能电站上水库5号沟坝体填筑垫层料的颗粒级配、密度及含水率、渗透和变形模量的试验研究,校核了垫层料的承载能力及抵抗变形的能力,了解垫层料的应力位移特性,从而为坝体垫层料的安全稳定分析提供科学依据.

  9. Optimal Operation of Pumped Hydro Energy Storage in Power System With Large Integration of Photovoltaic Generation%应对光伏并网的抽水蓄能电站优化运行

    Institute of Scientific and Technical Information of China (English)

    王辉; 崔建勇

    2014-01-01

    随着太阳能光伏的快速发展,光伏发电随机性与间歇性特点对电力系统的安全稳定运行带来了诸多挑战。建立供电可靠性评估模型评价光伏并网对电力系统运行的影响。提出采用抽水蓄能电站配合光伏发电运行来提高系统的可靠性。以成本最小化为目标建立抽水蓄能电站优化调度模型,采用蒙特卡罗模拟需求负载的不确定性,光伏出力的不确定性以及传统机组故障。运用遗传算法配合禁忌搜索对模型求解。通过IEEE-24节点算例分析验证模型与算法的可行性。仿真结果表明提出的方法在电力系统运行具有可靠性。而且,采取抽水蓄能电站运行修正模式可以有效解决电力过剩问题。%With the rapid development of photovoltaic (PV) generation the randomness and intermittence of PV generation evidently affect the secure and stable operation of power grid. A power supply reliability evaluation model is established to assess the impacts on grid-connected PV generation on power grid operation. It is proposed to improve power system reliability by pumped storage power station coordinated with grid-connected PV generation. Taking the minimized cost as the object, an optimal dispatching model of pumped storage power station is built, and the uncertainty of load demand, the uncertainty of PV generation output and the faults of traditional generating units are simulated by Monte Carlo simulation. The proposed dispatching model is solved by genetic algorithm combined with Tabu search. The feasibility of the proposed model and algorithm is validated by IEEE 24-bus system, and simulation results show that using the proposed method the reliability of power grid can be improved and the electric power surplus can be effectively coped with.

  10. Penis Pump

    Science.gov (United States)

    ... claim that they can be used to increase penis size, but there's no evidence that they work for ... circumstances, using a penis pump might help your penis maintain its natural size and shape after prostate surgery or if you ...

  11. Contamination of successive samples in portable pumping systems

    Science.gov (United States)

    Robert B. Thomas; Rand E. Eads

    1983-01-01

    Automatic discrete sample pumping systems used to monitor water quality should deliver to storage all materials pumped in a given cycle. If they do not, successive samples will be contaminated, a severe problem with highly variable suspended sediment concentrations in small streams. The cross-contamination characteristics of two small commonly used portable pumping...

  12. Foundation treatment for the alteration zones of underground powerhouse at Langyashan pumped storage power station%琅琊山抽水蓄能电站地下厂房蚀变岩带基础处理

    Institute of Scientific and Technical Information of China (English)

    姜成海; 王阳雪

    2013-01-01

    Steep dip thin limestone and granodiorite alteration zone were developed as the foundation of underground powerhouse at Langyashan pumped storage power station. The alteration zones distributed randomly and argillation as well as disintegration would occur as contact of water. Aiming at heteroge-neous rock foundation with limestone and granodiorite alteration zone, the method of whole rigidity box structure was adopted to solve the problem of insufficient carrying capacity and uneven settlement of the foundation. The result showed that it was of good effect and worthy reference.%琅琊山抽水蓄能电站地下厂房地基陡倾角薄层灰岩与花岗闪长蚀变岩带相间发育,其中蚀变岩带随机分布,遇水崩解泥化,强度较低。针对灰岩与蚀变岩相间的不均一岩性地基,采用整体刚性箱型基础结构,成功解决了地下厂房基础承载能力和不均匀沉降变形问题,为机组长期安全稳定运行奠定了基础,取得了良好的经济效益和社会效益。

  13. 溧阳抽水蓄能电站主体工程土石方调配平衡研究%Study on allocation balance of earth-rock work for main works of Liyang Pumped Storage Hydropower Station

    Institute of Scientific and Technical Information of China (English)

    肖浩; 申明亮; 张文熙; 任亮

    2011-01-01

    针对溧阳抽水蓄能电站工程C1标、C2标的施工方案,较全面系统地分析了土石方施工工程中的影响因素,以及各个方面相互联系和制约关系,进行了土石方调配平衡系统与道路运输系统等的综合优化,以寻求合理的土石方调配方案,达到快速、合理、经济施工之目的.%In allusion to the construction schemes of the bid-sections of C1 and C2 of the construction of Liyang Pumped Storage Hydropower Station, the impact factors from the construction of the earth-rock work are systematically analyzed herein along with the study on the mutually associated and restricted relationships at all the aspects concerned, and then the comprehensive optimizations are made on both the balancing system for the allocation of the earth-rock work and the road transportation system, so as to obtain a reasonable earth-rock work allocation scheme and get the target of quick, reasonable and economic construction.

  14. 太阳能蓄热型热泵在玫瑰花联产中的节能特性%Energy﹣saving performances of solar thermal storage heat pump in the co﹣production of roses

    Institute of Scientific and Technical Information of China (English)

    廖玉璠; 陈杨华

    2016-01-01

    The energy consumption of rose production process was very huge. Owing to single process of the do﹣mestic production and no resources for effective integration,the new energy utilization is proposed for the rose pro﹣duction and processing process,solar heat collection and heat storage system and heat pump system as the main,e﹣lectric heating for the auxiliary. On one hand,the hot﹣air drying rose of income and other aspects of the use of solar heating boiler to provide hot water production raised essential oil,effectively reduce energy consumption rose pro﹣duction process. The solar energy was stored in the way of energy storage,which can effectively alleviate the shortage of solar energy resources in the transition season and the instability of sunshine time. In addition,the drying of the condensed water recycling,the amount of water greatly reduced. Experiment result showed that the 175 kg flowers dried for 4 h Quality ratio of fresh flowers and dried flowers 3. 51 and 300 kg flowers put into reaction kettle for extracting essential oil,the power consumption ratio of three kinds production mode(solar energy heat pump sys﹣tem,single﹣stage pump,electric heating )is 12. 63. 6.%玫瑰花生产过程能源消耗巨大,现阶段国内其生产过程单一,没有将资源进行有效整合,针对玫瑰花生产加工过程提出新型能源利用方式,以太阳能集热蓄热系统与热泵系统联合为主,电加热为辅的方式,一方面利用所得热风干燥玫瑰花,另一方面利用太阳能加热锅炉提供热水生产玫瑰精油,有效地减少玫瑰花加工生产过程的能源消耗。采用相变蓄热材料对太阳能加以保存,能有效缓解过渡季节太阳能资源不足、日照时间不稳定等缺点。除此以外对干燥产生的冷凝水回收利用,大大减少了用水量。实验结果表明:4 h 烘干175 kg 鲜花,鲜花与干花质量比3.51,300 kg 鲜花进入反应釜提炼精

  15. Pumpspeicherbecken im Karstgrundwasserleiter des Weißen Jura der Schwäbischen Alb. Erste Ergebnisse aus der geologischen und hydrogeologischen Erkundung für die Planfeststellung Pumped-storage hydroelectric power plant in the Jurassic karst aquifer of the swabian alb, Germany

    Science.gov (United States)

    Neukum, Christoph; Köhler, Hans Joachim; Fernandez-Steeger, Tomas; Hennings, Sibylle; Azzam, Rafig

    2014-06-01

    Extensive geological and hydrogeological investigations have been undertaken for the planned pumped-storage hydroelectric power plant in "Blautal" (Swabian Alb, Germany) in order to characterise the Jurassic karst aquifer in which the lower reservoir will be constructed. The preferred option for the plant setup is to integrate the lower reservoir into the groundwater without sealing. Therefore, in order to reliably predict the impact of the pumped storage plant operations on the surrounding drinking water wells and groundwater dependent ecosystems, a comprehensive database has been developed to assess the hydraulic conditions of the karst aquifer. A large scale geological site investigation was carried out to characterise the rock mass and extensive hydraulic tests were performed in many boreholes. The results of the hydraulic characterisation were then implemented in a three dimensional flow model. In this paper, the first results of the geological and hydrogeological investigations are presented and discussed.

  16. Characteristic Study on Cool Storage in Transition Period of Cooling Tower-Ground Coupled Heat Pump in Hot-summer and Cold-winter Zone%夏热冬冷地区冷却塔—土壤耦合热泵过渡季蓄冷特性研究

    Institute of Scientific and Technical Information of China (English)

    谢莉; 刘金祥; 刘凯

    2013-01-01

    This paper proposes a soil cool storage model for cooling tower-ground coupled heat pump in transition period based on cooling and heating load characteristics in hot-summer and cold-winter zone,establishes a simulation model for the soil cool storage system of cooling tower-ground coupled heat pump in transition period by means of software TRNSYS,conducts working condition simulation analysis of the two main influencing factors of the model regarding soil cool storage in transition period and proposes a control strategy regarding soil cool storage in transition period for cooling tower-ground coupled heat pump.Besides,this paper also strives to explore an effective method to relieve yearly thermal imbalance of ground-source heat pump in hot-summer and cold-winter zone and improve system operation efficiency based on the researches above.%本文针对夏热冬冷地区冷热负荷特性,提出了冷却塔—土壤耦合热泵过渡季土壤蓄冷模式,采用软件TRNSYS建立了冷却塔—土壤耦合热泵过渡季土壤蓄冷系统仿真模型,并利用该模型针对过渡季土壤蓄冷的两个主要影响因素进行了工况模拟分析,,在此基础上提出了冷却塔—土壤耦合热泵过渡季节土壤蓄冷的控制策略.本文力图通过上述研究探索出缓解夏热冬冷地区土壤源热泵系统全年热失衡问题、提高该系统运行效率的有效途径.

  17. Exploring the Roles and Key Points of Primavera Proj ect Planner Software in Pumped Storage Power Station Proj ect Management%探讨P3软件在抽水蓄能电站项目管理中的作用及要点

    Institute of Scientific and Technical Information of China (English)

    何平

    2014-01-01

    近年来,一大批大型抽水蓄能电站工程陆续开工建设,抽水蓄能电站建设项目是一项投资高、规模大、周期长的大型工程。本文首先介绍了P3软件的功能特点,结合抽水蓄能电站项目管理的特点和过程,分别从业主单位、监理单位、施工单位三方角度论述在抽水蓄能电站项目管理中应用 P3软件的重要作用,并探讨了在抽水蓄能电站管理中应用P3软件的几方面要点。%Recently,a large number of pumped storage power station proj ects have constructed successively,which have been seen as the large-scale proj ects of the high investment,large scale and long period.This paper described the features of Primav-era Proj ect Planner software,combined with the characteristics and process management of pumped storage power station pro-j ect.Then this paper analyzed respectively the important roles of owners,supervisions and constructions during the process of P3 software application in pumped storage power station proj ect management.Finally,this paper discussed several important points which were helpful to apply P3 software in pumped storage power station proj ect management.

  18. 76 FR 29744 - Reliable Storage 2, LLC; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2011-05-23

    ... Federal Power Act (FPA), proposing to study the feasibility of the Rockaway Pumped Storage Hydroelectric... owners' express permission. The proposed pumped storage project would be comprised of four stages of... storage capacity of 3,500 to 4,000 acre-feet. The upper reservoir would be filled with water pumped out of...

  19. Modeling an autonomous wind turbine electric pump system

    Directory of Open Access Journals (Sweden)

    Andreea Forcos

    2009-10-01

    Full Text Available Being one of the variable renewable energy sources, wind energy integration can be made using storage methods. All of these have been developed during time, but one might be more accessible than others because is using a free natural resource, water. This is pump storage. The purpose of this paper is modeling an autonomous wind turbine connected to an electric pump, in the aim of storage, and finally the determination of the efficiency.

  20. Pumps; Pumpen

    Energy Technology Data Exchange (ETDEWEB)

    Bauer, H. [Gesellschaft fuer Praktische Energiekunde e.V., Muenchen (Germany). Forschungsstelle fuer Energiewirtschaft; Hellriegel, E. [Gesellschaft fuer Praktische Energiekunde e.V., Muenchen (Germany). Forschungsstelle fuer Energiewirtschaft; Pfitzner, G. [Gesellschaft fuer Praktische Energiekunde e.V., Muenchen (Germany). Forschungsstelle fuer Energiewirtschaft

    1994-11-01

    The technical features of commercial pump types are described with regard to their technical, energy-related and economic parameters, and characteristic data are presented in the form of data sheets. This is to provide a basis for a comparative assessment of different technologies and technical variants. The chapter `System specifications` describes the various fields of application of pumps and the resulting specific requirements. The design and function of the different pump types are described in `Technical description`. `System and plant description dscribes the design and adaptation of pumps, i.e. the adaptation of the plant data to the system requirements. `Data compilation` provides a survey of the types and systematics of the compiled data as well as a decision aid for selecting the pumps best suited to the various applications. The `Data sheet` section describes the structure and handling of the data sheets as well as the data contained therein. The data sheets are contained in the apapendix of this report. The section `General analysis` compares typical technical, energy-related and economic characteristics of the different pump types. This is to enable a rough comparison of pump types and to facilitate decisions. The chapter `Example` illustrates the use of the data sheets by means of a selected example. (orig./GL) [Deutsch] Die vorliegende Arbeit hat zum Ziel, Technik seriengefertigter und marktgaengiger Pumpen in typisierter Form hinsichtlich ihrer technischen, energetischen und wirtschaftlichen Parameter zu beschreiben und ihre charakteristischen Kennwerte in Datenblaettern abzubilden. Damit wird ein grundlegendes Instrument fuer die vergleichende Beurteilung unterschiedlicher Techniken bzw. Technikvarianten hinsichtlich energetischer und wirtschaftlicher Kriterien geschaffen. Im Abschnitt `Systemanforderungen` erfolgt die Beschreibung der einzelnen Anwendungsbereiche fuer Pumpen mit den speziellen daraus resultierenden Anforderungen. Der Aufbau und

  1. Noise Exposure Level in Workers of a Pumped Storage Power Station%某抽水蓄能电站运行人员噪声暴露水平检测与分析

    Institute of Scientific and Technical Information of China (English)

    刘跟生

    2013-01-01

    [ Objective ] To evaluate noise exposure levels of workers in pumped storage power stations. [ Methods ] Individual noise exposure levels in 2 patrolling workplaces and 1 control room and in both operating and alternative conditions were measured. A mathematical calculation based on individual exposure level and exposure time was used to evaluate workers' noise exposure of 42 h per week which was then converted to the time equivalent continuous A-weighted sound pressure level (Laeq) of 40 h per week. [ Results ] In this study, the noise exposure levels in 2 patrolling workplaces and 1 control room were measured 3 times a day in both operating and alternative conditions. The workers' Laeq of 42 h per week was 62.1 dB (A) . After conversion, the workers' Laeq of 40h per week was 62.3 dB (A). [ Conclusion ] The noise exposure levels of workers in pumped storage power station do not exceed the occupational exposure limit of 85dB (A) prescribed in Occupational exposure limits for hazardous agents in the workplace Part 2: Physical agents.%[目的]分析抽水蓄能电站运行人员的噪声暴露水平. [方法]检测运行人员在运行工况及备用工况每次巡检时的接噪强度以及巡检后控制室的噪声强度,结合运行人员在不同情况下的接噪时间,计算运行人员在四值三运转的工作制度下,1周42h接触噪声强度的等效声级,进而换算至1周40h接触噪声强度的等效声级. [结果]本研究共检测6次运行工况及3次备用工况下的个体噪声及控制室噪声,经过计算分析,得出运行人员1周42h接触噪声的等效连续A声级为62.1 dB(A),换算至1周40h接触噪声的等效连续A声级为62.3 dB(A). [结论]抽水蓄能电站运行人员的噪声暴露水平未超过《工作场所有害因素职业接触限值第2部分:物理因素》(GBZ 2.2-2007)中规定的职业接触限值85dB(A).

  2. 一体化太阳能热泵热水器运行特性的实验研究%Experimental Study on the Operating Characteristics of Solar Heat Pump Water Heater Integrated With Collector, Storage and Evaporation

    Institute of Scientific and Technical Information of China (English)

    卫梁彦; 王玲珑; 吴薇

    2011-01-01

    A novel solar heat pump water heater integrated with collector, storage and evaporation (SHPWHICSE) is presented and analyzed. By adding phase-changing materials into the collector/storage/evaporator, the solar energy can be absorbed and storied as latent heat. Calculating the storied energy according to temperature variation of the phasechange material which is chosen as paraffin, the result is that the storied energy can meet the heat load of this system. Solar got efficiency of this system is defined and compared with the direct expansion solar heat pump water heater. Experimental studies of SHPWHICSE with 150L water heating capacity are done at typical weather conditions in spring. The results indicate the system's COP is 5.63 on sunny days. Although on overcast or rainy days, the system's COP can reach 4. 13. Moreover, solar radiation intensity's unstable change has little influerace on the solar got efficiency and COP. Therefore, SHPWHICSE can be operating highly efficiently and stably at various weather conditions for domestic hot water.%介绍并研究了一种新型集热/蓄能/蒸发一体化太阳能热泵热水器系统(SHPWHICSE).该装置将真空管集热器、蓄能容器和蒸发器集于一体,通过相变潜热吸收并储存大量太阳能.根据相变材料(石蜡)在吸、放热过程中温度的变化计算蓄热量,确定相变材料中储存的热量能够满足系统热负荷.定义了一体化太阳能热泵系统的得热效率,并和直膨式太阳能热泵热水器得热效率进行比较.在春季典型工况下对容量为150L的SHPWHICSE进行实验研究,结果表明:晴天工况下,系统COP可达5.63;即使阴雨天,COP也可达4.13;太阳辐射强度的不稳定变化对热泵系统得热效率和COP的影响不大.因此,该系统在各种天气条件下都可以高效稳定地制取生活热水.

  3. Improved Polyurethane Storage Tank Performance

    Science.gov (United States)

    2014-06-30

    Figure 5.2.4 – Teen / Twenty Berm Bays from Tank 11 Corner Improved Polyurethane Storage Tank Performance Page 63 of 197 FY2009 Final Technical...5.3.9 Pump Discharge Pressure Measurement Improved Polyurethane Storage Tank Performance Page 76 of 197 FY2009 Final Technical Report...chamber pressure Improved Polyurethane Storage Tank Performance Page 173 of 197 FY2009 Final Technical Report Seaman Corporation could not be

  4. Types of Breast Pumps

    Science.gov (United States)

    ... Devices Consumer Products Breast Pumps Types of Breast Pumps Share Tweet Linkedin Pin it More sharing options ... used for feeding a baby. Types of Breast Pumps There are three basic types of breast pumps: ...

  5. Multi-objective optimization of combined operation of power station with wind power and pumped water power storage%风电-抽水蓄能电站联合运行的多目标优化

    Institute of Scientific and Technical Information of China (English)

    王晓兰; 李志伟

    2011-01-01

    In order to make full utilization of wind energy, and improve the output characteristics of wind farm, a optimization model of combined power supply system with wind power and pumped water power storage was established. The maximum benefit from this system and the smoothness of the output power of this system were taken as the optimization object and by using the multi-objective clonal selection algorithm, the solution and simulation analysis of this model were performed. The operation effectiveness of the system was improved by means of optimization and at the same time, the smoothness of the output power obtained. By using wind power forecasting and foregoing optimization, the dispatching values of either part in this system could be obtained for daily forecast of the combined operation.%为了充分利用风能,改善风电场的功率输出特性,建立风电场-抽水蓄能联合供电系统的优化模型.以联合运行系统的效益最大和输出功率平滑为优化目标,采用多目标克隆选择算法,对模型进行求解和仿真分析.通过优化计算使风电-抽水蓄能联合运行系统在提高运行效益的同时,输出功率得到平滑.应用风电场功率预测技术,通过上述优化,可以得到预测日联合运行系统各部分的优化功率调度值.

  6. 溧阳抽水蓄能电站混凝土配合比优化%Optimization of Concrete Mix Proportion in Liyang Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    兰肃; 吴书艳

    2013-01-01

    溧阳抽水蓄能电站初期混凝土配合比试验表明,与同标准混凝土比较,单位胶凝材料及用水量较大,且抗冻指标难以满足设计要求,分析其原因为砂石骨料石粉含量高所致.通过加强料源开采的管理、改造砂石加工系统等措施,降低了骨料中小于0.075 mm颗粒的含量,并提出了混凝土优化配合比,满足了用水量和抗冻指标要求,降低了胶凝材料用量,达到了经济目标.%The early concrete mix proportion testes for Liyang Pumped-storage Power Station show that, comparing with standard concrete, the cement and water utilization in concrete is larger and the frost indexes are difficult to meet design requirements. The study shows that higher powder content in gravel aggregate is the cause. By strengthening raw material mining management and transforming aggregate processing system to reduce the content of particles with a size less than 0.075 mm in aggregate, and optimizing the mix proportion of concrete, the water utilization and frost resistance of concrete meet the requirements of design, and the cement utilization is reduced to achieve economic target.

  7. 抽水蓄能电机极靴形状设计及数值分析%Design and Calculate Some Parameters of Pole-shoe Shape for the Pump-storage Machines

    Institute of Scientific and Technical Information of China (English)

    吴天皓; 李金香

    2012-01-01

    抽水蓄能电机转速高和起停频繁,在设计上采用很多特殊结构.对于采用特殊极靴形状的抽水蓄能电机,不能用传统的设计公式进行设计和计算,这给电机设计带来很大困难.本文针对这一问题建立特殊极靴形状设计及有关的数值分析模型,形成优化的设计方法,并借助于ANSYS软件编制了前处理程序和接口程序.以回龙抽水蓄能电机为例,进行了极靴形状设计和数值分析并用于电机的工程设计中,该电机已于2004年底并网发电.%Some specific structure are used in the design of pump-storage machines (PSM), due to higher rotation, more frequent starl-up and shut-down. It's very difficult to design and calculate some parameters of PSM without conventional polc-shoe shape by traditional mcthod (Magnctic-Circuit- Method). Thus,numerical model is presented in this paper to design pole enclosure and calculate thcm. Prcproccssing and interface programs were developed by APDL command languagc in ANSYS sofiware. Polc-shoe shape of the PSM in HUILONG power station was designed and their paramcters werc calculated by this mcthod.The machine had been manufactured and commissioncd by the end of 2004.

  8. Optimization and Design of Ecological Bottom Outlet of Lower Reservoir, Cisokon Pumped Storage Power Plant%印尼西索肯抽水蓄能电站下水库生态底孔的优化与设计

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    The lower reservoir of Cisokon Pumped Storage Power Plant consists of RCC gravity dam, overflow surface outlet and bottom outlet.The bottom outlet is to release water downstream for ecology, irrigation and reservoir water reduction when the reservoir impounds and operates normally.In the original design of the bottom outlet, the potential risks of gate plugging not closed tightly may exist.There-fore, the alternative scheme is compared and argued.The design scheme of enlarging the shaft section at inlet and providing gate slot is proposed.Additionally, the bottom outlet and the lower installed capacity station are integrated to fully utilize the ecological flow for more power generation.This optimization results in outstanding economic benefit.%印尼西索肯抽水蓄能电站的下水库由碾压混凝土重力坝、溢流表孔和底孔组成;底孔的功能是在水库蓄水和正常运行时,为下游提供生态供水、灌溉流量和降低库水位。原底孔设计方案存在下闸封堵不落实等问题,故对其进行了替代方案的比较和论证;推荐采用加大进口竖井断面、增设闸门槽的设计方案。另外,为充分利用生态流量多发电,最终将底孔与小电站结合起来,经济效益明显。

  9. Electricity Storage. Technology Brief

    Energy Technology Data Exchange (ETDEWEB)

    Simbolotti, G. [Italian National Agency for New Technologies, Energy and Sustainable Economic Development ENEA, Rome (Italy); Kempener, R. [International Renewable Energy Agency IRENA, Bonn (Germany)

    2012-04-15

    Electricity storage is a key technology for electricity systems with a high share of renewables as it allows electricity to be generated when renewable sources (i.e. wind, sunlight) are available and to be consumed on demand. It is expected that the increasing price of fossil fuels and peak-load electricity and the growing share of renewables will result in electricity storage to grow rapidly and become more cost effective. However, electricity storage is technically challenging because electricity can only be stored after conversion into other forms of energy, and this involves expensive equipment and energy losses. At present, the only commercial storage option is pumped hydro power where surplus electricity (e.g. electricity produced overnight by base-load coal or nuclear power) is used to pump water from a lower to an upper reservoir. The stored energy is then used to produce hydropower during daily high-demand periods. Pumped hydro plants are large-scale storage systems with a typical efficiency between 70% and 80%, which means that a quarter of the energy is lost in the process. Other storage technologies with different characteristics (i.e. storage process and capacity, conversion back to electricity and response to power demand, energy losses and costs) are currently in demonstration or pre-commercial stages and discussed in this brief report: Compressed air energy storage (CAES) systems, Flywheels; Electrical batteries; Supercapacitors; Superconducting magnetic storage; and Thermal energy storage. No single electricity storage technology scores high in all dimensions. The technology of choice often depends on the size of the system, the specific service, the electricity sources and the marginal cost of peak electricity. Pumped hydro currently accounts for 95% of the global storage capacity and still offers a considerable expansion potential but does not suit residential or small-size applications. CAES expansion is limited due to the lack of suitable

  10. A Day-Ahead Dispatching Strategy for Power Pool Composed of Wind Farms, Photovoltaic Generations, Pumped-Storage Power Stations, Gas Turbine Power Plants and Energy Storage Systems Based on Multi Frequency Scale Analysis%基于功率多频率尺度分析的风光水气储联合系统日前调度策略

    Institute of Scientific and Technical Information of China (English)

    马静; 石建磊; 李文泉; 王增平

    2013-01-01

    Based on multi frequency scale analysis on power output of wind farms and photovoltaic (PV) generation (PWP), a day-ahead dispatching strategy for power pool composed of wind farms, photovoltaic generations, pumped-storage power stations, gas turbine power plants and energy storage systems is proposed. Firstly, according to the control objectives the filter analysis on PWP is performed to extract PWP components corresponding to different frequency scales to draft output schedulings for of all kinds of complementary power generations in the power pool; then using improved particle swamp optimization (PSO) the total power output of the power pool is computed;finally, based on different day-ahead dispatching modes and considering stability and wind power accommodation capability of the power pool, the per-unit generation costs of wind farms, photovoltaic generations, pumped-storage power stations, gas turbine power plants and energy storage systems are optimized to draft final output schedulings. Results of calculation example show that comparing with traditional optimization models and optimization algorithms, the proposed method can cope with the power fluctuation due to grid-connection of large-scale wind farms and PV generations to implement stationary power output of the power pool, meanwhile the economy, efficiency, low-carbon operation and environmental protection of the power pool can be ensured.%  提出一种基于功率多频率尺度分析的风光水气储联合系统日前调度策略。该策略首先根据控制目标对风光出力(power of wind photovoltaic,PWP)进行滤波分析,提取不同频率尺度下的PWP分量,制定各类补偿电站出力计划;然后利用改进粒子群优化算法并行优化各电站内部综合成本,计算联合系统总体输出功率;最后依据不同日前调度模式,考虑稳定性和风光消纳能力,优化风光水气储系统单位发电成本,制定出力计划。算例分析结果

  11. 高水头抽水蓄能电站球阀与导叶联动的关闭规律研究%Study on Linkage Closing Rule between Ball Valve and Guide Vane in High Head Pumped Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    张春; 杨建东

    2011-01-01

    针对高水头抽水蓄能电站机组甩负荷问题,以某抽水蓄能电站为例,采用导叶直线关闭规律及球阀与导叶联动的关闭规律进行探讨,并基于水泵水轮机全特性曲线进行数值模拟.结果表明,该规律能有效削减机组流量和蜗壳压力的第2峰值,最大值仍发生于第1波峰,而第1峰值则取决导叶初始(第1段)的关闭速度.%Aiming at the load shedding of hydroelectric sets in high head pumped storage power station, taking a pumped storage power station for an example, this paper discusses the straight-line closing rule of guide vane and linkage closing rule between ball valve and guide vane. And then the numerical calculation of pumped storage power station is simulated in terms of pump-turbine characteristic curve. The results show that the linkage closing rule can effectively reduce turbine flow and the second peak value of spiral case pressure while the maximum pressure remains to occur the first wave crest; the first peak pressure of spiral case depends on the initial (the first straight-line ) closing rate of the guide vane.

  12. A concept of an electricity storage system with 50 MWh storage capacity

    Directory of Open Access Journals (Sweden)

    Józef Paska

    2012-06-01

    Full Text Available Electricity storage devices can be divided into indirect storage technology devices (involving electricity conversion into another form of energy, and direct storage (in an electric or magnetic fi eld. Electricity storage technologies include: pumped-storage power plants, BES Battery Energy Storage, CAES Compressed Air Energy Storage, Supercapacitors, FES Flywheel Energy Storage, SMES Superconducting Magnetic Energy Storage, FC Fuel Cells reverse or operated in systems with electrolysers and hydrogen storage. These technologies have diff erent technical characteristics and economic parameters that determine their usability. This paper presents two concepts of an electricity storage tank with a storage capacity of at least 50 MWh, using the BES battery energy storage and CAES compressed air energy storage technologies.

  13. Performance of a Solar Heating System with Photovoltaic Thermal Hybrid Collectors and Heat Pump

    DEFF Research Database (Denmark)

    Dannemand, Mark; Furbo, Simon; Perers, Bengt

    2017-01-01

    . When the solar collectors are unable to supply the heat demand an auxiliary heat source is used. Heat pumps can generate this heat. Liquid/water heat pumps have better performance than air/water heat pumps in cold climates but requires installation of a tubing system for the cold side of the heat pump....... The tubes are typically placed in the ground, requires a significant land area and increase the installation cost. A new system design of a solar heating system with two storage tanks and a liquid/water heat pump is presented. The system consists of PVT collectors that generate both heat and electricity....... Heat from the collectors is transferred to a domestic hot water storage tank or to a cold storage tank, which is used as the source for the heat pump. When the heat pump charges the warm storage tank, heat is extracted from the cold storage tank, which then can be reheated by the PVT collectors...

  14. Energy Storage.

    Science.gov (United States)

    Eaton, William W.

    Described are technological considerations affecting storage of energy, particularly electrical energy. The background and present status of energy storage by batteries, water storage, compressed air storage, flywheels, magnetic storage, hydrogen storage, and thermal storage are discussed followed by a review of development trends. Included are…

  15. Lifecycle Cost Analysis of Hydrogen Versus Other Technologies for Electrical Energy Storage

    Energy Technology Data Exchange (ETDEWEB)

    Steward, D. [National Renewable Energy Lab. (NREL), Golden, CO (United States); Saur, G. [National Renewable Energy Lab. (NREL), Golden, CO (United States); Penev, M. [National Renewable Energy Lab. (NREL), Golden, CO (United States); Ramsden, T. [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2009-11-01

    This report presents the results of an analysis evaluating the economic viability of hydrogen for medium- to large-scale electrical energy storage applications compared with three other storage technologies: batteries, pumped hydro, and compressed air energy storage (CAES).

  16. Pump characteristics and applications

    CERN Document Server

    Volk, Michael

    2013-01-01

    Providing a wealth of information on pumps and pump systems, Pump Characteristics and Applications, Third Edition details how pump equipment is selected, sized, operated, maintained, and repaired. The book identifies the key components of pumps and pump accessories, introduces the basics of pump and system hydraulics as well as more advanced hydraulic topics, and details various pump types, as well as special materials on seals, motors, variable frequency drives, and other pump-related subjects. It uses example problems throughout the text, reinforcing the practical application of the formulae

  17. Progress in electrical energy storage system:A critical review

    Institute of Scientific and Technical Information of China (English)

    Haisheng Chen; Thang Ngoc Cong; Wei Yang; Chunqing Tan; Yongliang Li; Yulong Ding

    2009-01-01

    Electrical energy storage technologies for stationary applications are reviewed.Particular attention is paid to pumped hydroelectric storage,compressed air energy storage,battery,flow battery,fuel cell,solar fuel,superconducting magnetic energy storage, flywheel, capacitor/supercapacitor,and thermal energy torage.Comparison is made among these technologies in terms of technical characteris-tics,applications and deployment status.

  18. 节能调度环境下风电、水电与抽水蓄能电站联合运行优化模型及应用%Optimization Model of Wind Power, Thermal Power and Pumped Storage Power Station Jointly Operation under Energy-saving Dispatching Environment

    Institute of Scientific and Technical Information of China (English)

    王抒祥; 鞠立伟; 尚金成; 张金良; 谭忠富; 王文迪

    2013-01-01

    为吸纳弃风、增加风电并网量,基于节能发电调度办法,以发电产生的燃煤成本、机组启停成本及污染排放成本最小为目标,提出了风电、火电联合运行优化模型和风电、火电与抽水蓄能电站联合运行优化模型.算例分析表明,与选择火电作为风电备用服务相比,当选择抽水蓄能电站作为备用服务时,燃煤发电成本、启停成本及污染排放成本明显降低,弃风被完全消纳.选用抽水蓄能电站作为风电备用服务具有显著的环境效益.%In order to be able to absorb the abandoned wind and increase wind power grid-connection, this paper puts forward wind power, thermal power jointly operation optimization model and wind power, thermal power, pumped storage power jointly operation optimization model based on the energy-saving generation dispatching way under the target of minimizing the cost of coal-fired cost, unit commitment and pollution emissions. Comparison of the thermal power as reserve service, the example results show that selecting pumped storage power station as reserve service can reduce the cost of coal-fired power generation, unit commitment and pollution emissions significantly and eliminate abandoned wind. Thus, the choice of pumped storage power station as wind power reserve service has significant environmental benefits.

  19. Grid Connection Scheduling Strategy for Pumped-storage and Wind Power Based on Spinning Reserve and Output Prediction%基于旋转备用和出力预测的风电抽水蓄能并网调度策略

    Institute of Scientific and Technical Information of China (English)

    陈峦; 陈池

    2011-01-01

    以风电场出力短期预测和电网提供的旋转备用容量为依据,提出了一种风电抽水蓄能并网发电调度策略.在建立系统数学模型的基础上,进行了仿真试验,讨论了电网旋转备用容量大小变化对风电抽水蓄能并网系统性能的影响.通过3种不同特征风速样本的对比仿真试验,分析了抽水蓄能并网系统在不同特征风速下的运行差异.仿真结果表明,所提出的调度策略有效、可行.%Based on the short-term forecast of wind farm output and the spinning reserve capacity of grid, an operation scheduling strategy for wind power and pumped-storage power system is proposed. After establishing the mathematical model, the simulation tests are conducted and the impacts of grid spinning reserve capacity on the performances of wind power and pumped-storage power system are studied. By comparing the simulations of three typical wind speeds, the differences of pumped-storage power operation are analyzed. The simulating results show that the proposed scheduling strategy is effective and feasible.

  20. NV Energy Electricity Storage Valuation

    Energy Technology Data Exchange (ETDEWEB)

    Ellison, James F.; Bhatnagar, Dhruv; Samaan, Nader A.; Jin, Chunlian

    2013-06-30

    This study examines how grid-level electricity storage may benet the operations of NV Energy in 2020, and assesses whether those benets justify the cost of the storage system. In order to determine how grid-level storage might impact NV Energy, an hourly production cost model of the Nevada Balancing Authority (\\BA") as projected for 2020 was built and used for the study. Storage facilities were found to add value primarily by providing reserve. Value provided by the provision of time-of-day shifting was found to be limited. If regulating reserve from storage is valued the same as that from slower ramp rate resources, then it appears that a reciprocating engine generator could provide additional capacity at a lower cost than a pumped storage hydro plant or large storage capacity battery system. In addition, a 25-MW battery storage facility would need to cost $650/kW or less in order to produce a positive Net Present Value (NPV). However, if regulating reserve provided by storage is considered to be more useful to the grid than that from slower ramp rate resources, then a grid-level storage facility may have a positive NPV even at today's storage system capital costs. The value of having storage provide services beyond reserve and time-of-day shifting was not assessed in this study, and was therefore not included in storage cost-benefit calculations.

  1. Experience with Dry Running Vacuum Pumps in Helium Service

    Science.gov (United States)

    Arztmann, R.

    2008-03-01

    A process vacuum system for helium using dry running vacuum pumps only was shop tested and installed in a refrigeration plant to serve cavities operating at 2K for a cryogenic storage ring. The paper explains the joint development steps of Busch AG and Linde Kryotechnik AG to use dry running vacuum pumps for helium service at ambient temperature. A roots type booster pump followed by a non lube rotary screw pump provides very good performance in a helium vacuum pump system. Variable frequency drives on both pumps allow to adjust the pump characteristics to a wide range of operating parameters. Operation without friction of sealing elements in the compression space also of the screw pump promises extended maintenance intervals and virtually no wear on the rotors. The current plant operation at Max Plank Institute in Heidelberg, Germany Laboratory will provide additional experience for further applications.

  2. The Role of Energy Storages in Energy Independent Croatia

    DEFF Research Database (Denmark)

    Krajačić, Goran; Mathiesen, Brian Vad; Duić, Neven

    2009-01-01

    electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped Hydro and Heat Pumps in combination with Heat Storages...

  3. LMFBR with booster pump in pumping loop

    Science.gov (United States)

    Rubinstein, H.J.

    1975-10-14

    A loop coolant circulation system is described for a liquid metal fast breeder reactor (LMFBR) utilizing a low head, high specific speed booster pump in the hot leg of the coolant loop with the main pump located in the cold leg of the loop, thereby providing the advantages of operating the main pump in the hot leg with the reliability of cold leg pump operation.

  4. Aflatoxins & Safe Storage

    Directory of Open Access Journals (Sweden)

    Philippe eVillers

    2014-04-01

    Full Text Available The paper examines both field experience and research on the prevention of the exponential growth of aflatoxins during multi-month post harvest storage in hot, humid countries. The approach described is the application of modern safe storage methods using flexible, Ultra Hermetic™ structures that create an unbreatheable atmosphere through insect and microorganism respiration alone, without use of chemicals, fumigants, or pumps. Laboratory and field data are cited and specific examples are given describing the uses of Ultra Hermetic storage to prevent the growth of aflatoxins with their significant public health consequences. Also discussed is the presently limited quantitative information on the relative occurrence of excessive levels of aflatoxin (>20 ppb before versus after multi-month storage of such crops as maize, rice and peanuts when under high humidity, high temperature conditions and, consequently, the need for further research to determine the frequency at which excessive aflatoxin levels are reached in the field versus after months of post-harvest storage. The significant work being done to reduce aflatoxin levels in the field is mentioned, as well as its probable implications on post harvest storage. Also described is why, with some crops such as peanuts, using Ultra Hermetic storage may require injection of carbon dioxide or use of an oxygen absorber as an accelerant. The case of peanuts is discussed and experimental data is described.

  5. Transient Dynamics in Molecular Junctions: Coherent Bichromophoric Molecular Electron Pumps

    OpenAIRE

    2010-01-01

    The possibility of using single molecule junctions as electron pumps for energy conversion and storage is considered. It is argued that the small dimensions of these systems enable to make use of unique intra-molecular quantum coherences in order to pump electrons between two leads and to overcome relaxation processes which tend to suppress the pumping efficiency. In particular, we demonstrate that a selective transient excitation of one chromophore in a bi-chromophoric donor-bridge-acceptor ...

  6. Industrial Heat Pump for a High Temperature District Heating Application

    DEFF Research Database (Denmark)

    Poulsen, Claus Nørgaard

    2013-01-01

    by excess thermal energy from thermal solar panels. An industrial heat pump system using the natural refrigerant ammonia, is extracting the thermal energy from the storage when needed, and produce hot water at 85°C, for the district heating grid. The heat pump also acts as contributor to electricity grid...

  7. Annual cycle solar energy utilization with seasonal storage. Part 7. Examination on design and control of the system partially recovering exhaust heat of heat pump; Kisetsukan chikunetsu ni yoru nenkan cycle taiyo energy riyo system ni kansuru kenkyu. 7. Bubuntekina hainetsu kaishu wo koryoshita baai no sekkei seigyoho no kento

    Energy Technology Data Exchange (ETDEWEB)

    Tanaka, H.; Okumiya, M. [Nagoya University, Nagoya (Japan)

    1996-10-27

    The capacity and performance of the existing system that recovers the overall heating and cooling exhaust heat completely into a seasonal storage tank and the system that discharges the exhaust heat slightly to the outside and recovers it partially were compared and investigated. The system uses a central single-duct discharge system as an air-conditioning system. A heat pump and a flat-plate solar collector installed on the roof of a building are used as the heat source. The seasonal storage tank in the ground just under the building is a cylindrical water tank of 5 m deep with the concrete used as body. The upper surface of a storage tank is heat-insulated by a stylo-platform of 200 mm, and the lower side surface by a stylo-platform of 100 mm. Calculation when the difference in temperature used in a seasonal storage tank is set to 35{degree}C and 25{degree}C was performed for the system that has two control methods. The overall exhaust heat recovery system is almost the same in energy performance as the partial exhaust heat recovery system. The partial exhaust heat recovery system is more advantageous on the economic side. 4 refs., 6 figs., 3 tabs.

  8. Dry vacuum pumps

    Science.gov (United States)

    Sibuet, R.

    2008-05-01

    For decades and for ultimate pressure below 1 mbar, oil-sealed Rotary Vane Pumps have been the most popular solution for a wide range of vacuum applications. In the late 80ies, Semiconductor Industry has initiated the development of the first dry roughing pumps. Today SC applications are only using dry pumps and dry pumping packages. Since that time, pumps manufacturers have developed dry vacuum pumps technologies in order to make them attractive for other applications. The trend to replace lubricated pumps by dry pumps is now spreading over many other market segments. For the Semiconductor Industry, it has been quite easy to understand the benefits of dry pumps, in terms of Cost of Ownership, process contamination and up-time. In this paper, Technology of Dry pumps, its application in R&D/industries, merits over conventional pumps and future growth scope will be discussed.

  9. 风电—抽蓄—海水淡化综合系统及其智能控制%Intelligent control of hybrid wind-pumped storage-desalination system

    Institute of Scientific and Technical Information of China (English)

    任岩; 郑源; 陈德新; 李冲

    2012-01-01

    我国很多海岛地处偏远,电网很难达到,为解决海岛的用电用水问题,提出了风力发电—抽水蓄能—海水淡化综合系统。建立了系统的数学模型,并对系统进行智能控制,搭建了控制系统硬件平台,提出了智能控制策略,利用VC#2008软件建立了可视化的主控平台,将系统的数据采集、数据检测、控制、数据后处理、数据报表打印等集成在一个交互平台。利用该控制系统可以对风力发电—抽水蓄能—海水淡化综合系统进行实时监测,并通过对实时数据的处理判断系统的运行状态,对综合系统进行智能调度,确保了综合系统运行的高效性和可靠性。将该系统用于海岛,能充分利用当地丰富的风能资源解决海岛用电用水的问题,通过对其进行智能控制,可以实现整个系统的无人值班。%Many islands in our country are far away where power supply by the grid is too difficult.To solve the problems of electricity and freshwater uses in these areas,a hybrid wind-pumped storage-desalination system was brought forward recent years.In the present work,a mathematical model of such hybrid systems was developed and a hardware platform of control system was built.The focus was to study intelligent control of the system and formulate a practical control strategy.By using VC 2008,a visual interactive platform was established as a central control for data collection,data examination,control,data post-processing,data report-forms,data mimeograph and so on,and it was applied to real-time monitoring of the hybrid system.Through analysis of the real-time data and estimation of the system′s operating state,intelligent dispatching schemes have been formulated to assure efficiency and reliability of system operation.The system,if built on an island,can make use of the local abundant wind energy and the adoption of intelligent control system provides the island with self-service of electricity and

  10. Centrifugal pump handbook

    CERN Document Server

    Pumps, Sulzer

    2010-01-01

    This long-awaited new edition is the complete reference for engineers and designers working on pump design and development or using centrifugal pumps in the field. This authoritative guide has been developed with access to the technical expertise of the leading centrifugal pump developer, Sulzer Pumps. In addition to providing the most comprehensive centrifugal pump theory and design reference with detailed material on cavitation, erosion, selection of materials, rotor vibration behavior and forces acting on pumps, the handbook also covers key pumping applications topics and operational

  11. 40 CFR 265.1052 - Standards: Pumps in light liquid service.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 25 2010-07-01 2010-07-01 false Standards: Pumps in light liquid..., STORAGE, AND DISPOSAL FACILITIES Air Emission Standards for Equipment Leaks § 265.1052 Standards: Pumps in light liquid service. (a)(1) Each pump in light liquid service shall be monitored monthly to...

  12. Alternative backing up pump for turbomolecular pumps

    Science.gov (United States)

    Myneni, Ganapati Rao

    2003-04-22

    As an alternative to the use of a mechanical backing pump in the application of wide range turbomolecular pumps in ultra-high and extra high vacuum applications, palladium oxide is used to convert hydrogen present in the evacuation stream and related volumes to water with the water then being cryo-pumped to a low pressure of below about 1.e.sup.-3 Torr at 150.degree. K. Cryo-pumping is achieved using a low cost Kleemenco cycle cryocooler, a somewhat more expensive thermoelectric cooler, a Venturi cooler or a similar device to achieve the required minimization of hydrogen partial pressure.

  13. Terrestrial Energy Storage SPS Systems

    Science.gov (United States)

    Brandhorst, Henry W., Jr.

    1998-01-01

    Terrestrial energy storage systems for the SSP system were evaluated that could maintain the 1.2 GW power level during periods of brief outages from the solar powered satellite (SPS). Short-term outages of ten minutes and long-term outages up to four hours have been identified as "typical" cases where the ground-based energy storage system would be required to supply power to the grid. These brief interruptions in transmission could result from performing maintenance on the solar power satellite or from safety considerations necessitating the power beam be turned off. For example, one situation would be to allow for the safe passage of airplanes through the space occupied by the beam. Under these conditions, the energy storage system needs to be capable of storing 200 MW-hrs and 4.8 GW-hrs, respectively. The types of energy storage systems to be considered include compressed air energy storage, inertial energy storage, electrochemical energy storage, superconducting magnetic energy storage, and pumped hydro energy storage. For each of these technologies, the state-of-the-art in terms of energy and power densities were identified as well as the potential for scaling to the size systems required by the SSP system. Other issues addressed included the performance, life expectancy, cost, and necessary infrastructure and site locations for the various storage technologies.

  14. Prototype storage cavity for LEP accelerating RF

    CERN Multimedia

    1980-01-01

    The principle of an RF storage cavity was demonstrated with this prototype, working at 500 MHz. Ian Wilso seems to hold it in his hands. The storage cavities had 4 portholes, 1 each for: RF feed; tuning; connection to the accelerating cavity; vacuum pump. The final storage cavities were larger, to suit the lower LEP accelerating frequency of 352.2 MHz. See also 8002294, 8006510X, 8109346, 8407619X, and Annual Report 1980, p.115.

  15. 牧草种子热泵辅助型太阳能储热干燥设备设计与试验%Design and Experiment of Heat Pump Assisted Solar Energy Heat-storage Drying Equipment for Herbage Seed

    Institute of Scientific and Technical Information of China (English)

    王全喜; 王德成; 杜建强; 翟改霞

    2012-01-01

    Aiming at herbage seed drying equipment problems of power consumption, air discharge and solar energy application, a drying mode was proposed. Basis heating was supplied by thermal-stored solar energy, and air charge was dehumidified and reused by heat pump. Main working parts, such as thermal collector, thermal storage and heat pump, and whole drying machine were designed. Using movable design idea, thermal collector was controllable and whole machine was placed safely. Performance test results showed that handling capacity reached to 161 kg/h, power handling capacity achieved to 8. 4 kg/ ( kW · h) , the drying capacity reached to 3 367 kg · % /h, and dry strength achieved to 6. 7 kg/ ( m3 · h). The power consumption ration of solar PCM heat-storage drying, solar energy and heat pump teamwork drying, heat-pump drying and electricity power drying was 0. 9:1.0:1.2:1. 5.%针对牧草种子干燥设备在能耗、排放和太阳能使用等方面存在的问题,提出了太阳能储热供热为主,尾气由热泵除湿后回收使用为辅的节能零排放干燥模式,完成了集热、储热和热泵等主要工作部件以及整机的结构设计,用移动式设计实现了太阳能集热可控和整机安全贮存.试验结果表明:处理量161 kg/h,度电处理量8.4 kg/(kW·h),干燥能力3 367 kg·%/h,干燥强度6.7 kg/(m3 ·h);太阳能相变储热干燥、太阳能一热泵联合干燥、热泵干燥和电加热干燥4种供热干燥模式的耗电量之比是0.9:1.0:1.2:1.5.

  16. Large electromagnetic pumps. [LMFBR

    Energy Technology Data Exchange (ETDEWEB)

    Kilman, G.B.

    1976-01-01

    The development of large electromagnetic pumps for the liquid metal heat transfer systems of fission reactors has progressed for a number of years. Such pumps are now planned for fusion reactors and solar plants as well. The Einstein-Szilard (annular) pump has been selected as the preferred configuration. Some of the reasons that electromagnetic pumps may be preferred over mechanical pumps and why the annular configuration was selected are discussed. A detailed electromagnetic analysis of the annular pump, based on slug flow, is presented. The analysis is then used to explore the implications of large size and power on considerations of electromagnetic skin effect, geometric skin effect and the cylindrical geometry.

  17. 火电、风电与抽水蓄能电站联合运行成本效益分析模型研究%Cost-benefit Analysis Model of Joint Operation of Thermal Power, Wind Power and Pumped Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    安建强; 鞠立伟; 尚金成; 宋艺航; 徐隽; 张金良

    2012-01-01

    In order to solve the abandoned wind in wind power generation and reduce CO2 emissions, this article establishes joint operation of cost-benefit analysis model of thermal power, wind power and pumped storage power station. Empirical analysis finds that using pumped storage power station as an alternative to thermal power plants as wind power reserve service can absorb unused wind energy, increase the utilization efficiency of wind energy, reduce the operation of coal-fired units and CO2 emissions, which has significant environmental benefits. Taking the simulation results as target value, the sensitivity analysis of joint operation of cost-effectiveness analysis model of thermal power, wind power and pumped storage power station shows that grid-connected wind power is the sensitivity factors in reducing CO2 emissions and the profits of grid purchasing power.%为解决风能发电中的弃风问题和降低CO2的排放,提出了火电、风电与抽水蓄能电站联合运行成本效益分析模型.仿真计算结果表明,利用抽水蓄能电站替代火电厂作为风能发电的备用服务,可吸纳未被利用的风能、减少燃煤机组的使用、增加电网吸纳风电的能力、降低CO2的排放量,具有显著的环境效益.以仿真结果为目标值,对火电、风电与抽水蓄能电站联合运行成本效益分析模型进行敏感性分析发现,风电并网量是CO2减排和电网购电利润减少的敏感性因素.

  18. 拟定蒙西电网风电与蓄能电站配合运行规模的简化方法%A Simplified Determination Method for Capacity Combination of Wind Power Stations and Pumped Storage Power Stations in West Inner Mongolia Power Grid

    Institute of Scientific and Technical Information of China (English)

    曾非同; 陈初龙; 唐修波

    2015-01-01

    大规模风电接入对电网影响较大,而抽水蓄能电站启停迅速,可以较好的配合风电运行,减小对电网的影响. 结合内蒙古西部电网(简称蒙西电网)风电基地出力特性和典型日负荷特性,从风电与用电负荷的吻合程度、对电网调峰容量的影响、弃风电量的经济比较分析,抓住了影响风电与抽水蓄能电站配合运行规模的主要因素:在负荷低谷时段风电的上网(容量)率,提出了合理的简化方法. 该方法简单直观、实用有效,需要的资料少,对合理开发利用风电资源的规模估算具有实际指导意义,对风电与抽水蓄能电站配合运行规模的规划设计具有参考价值.%Large-scale use of wind power raises many problems in integration into the existing power grid .While the pumped storage power stations are of advantages such as quick startup and shutdown , which could cooperate with wind power stations and reduce their negative influence to the power grid .In this paper , capacity planning for the wind power base in the West Inner Mongolia Power Grid is discussed .Based on the characteristics of output power and typical daily load, major factors that would affect the capacity combination of wind power stations and pumped storage power stations in the power grid are analyzed , including the agreement between the wind power output and the power load , the influ-ence on the peak regulating capacity , and the cost of abandoned wind power .A simplified method is then proposed for the determination of wind power capacity rate in the low load period .This effective and practical method is of great use to the wind power capacity planning , and also could be a useful reference for the capacity planning of power grid with combination of wind power stations and pumped storage power stations .

  19. 抽水蓄能机组无位置传感器静止变频器启动控制策略%A Control Strategy of Static Frequency Converter Start-up for Pumped-storage Power Plants Without Position Sensors

    Institute of Scientific and Technical Information of China (English)

    王德顺; 杨波; 李官军; 陶以彬; 姬联涛

    2012-01-01

    提出了一种抽水蓄能机组静止变频器启动控制策略,并根据理想同步电机数学模型分析了机组电压与磁通的关系,实现了机组启动过程中的无位置传感器转子位置检测。介绍了基于无位置传感器的转子初始位置检测、低频阶段转子位置估算的原理与实现方法,并进行了仿真验证。基于提出的控制策略,开发了大型抽水蓄能机组静止变频器启动装置,并应用于潘家口抽水蓄能电站90MW发电电动机的启动控制试验,实现了水泵启动过程的转子位置检测、脉冲换相、自然换相及同期控制。研究成果已在某抽水蓄能电站投入运行,通过了现场应用验证,证明了所提出方法的可行性。%A static frequency converter start-up control strategy for pumped-storage power unit is presented.Rotor position detection without position sensor is realized through voltage and magnetism equations of mathematical model of an ideal synchronous motor.The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations.Based on the proposed control strategy,a static frequency converter start-up device for large-scale pumped-storage unit is developed,and applied to start-up control test in the 90 MW generator/motor of Panjiakou pumped-storage power plant.Test results show that rotor position detection,pulse commutation,natural commutation,and unit synchronous procedure control of static start-up have all been achieved.The outcomes have been applied to running of field equipment,which proves the feasibility of mentioned method.

  20. Large-scale electricity storage utilizing reversible solid oxide cells combined with underground storage of CO2 and CH4

    DEFF Research Database (Denmark)

    Jensen, Søren Højgaard; Graves, Christopher R.; Mogensen, Mogens Bjerg

    2015-01-01

    Electricity storage is needed on an unprecedented scale to sustain the ongoing transition of electricity generation from fossil fuels to intermittent renewable energy sources like wind and solar power. Today pumped hydro is the only commercially viable large-scale electricity storage technology, ......-scale electricity storage with a round-trip efficiency exceeding 70% and an estimated storage cost around 3 b kW-1 h-1, i.e., comparable to pumped hydro and much better than previously proposed technologies...

  1. An analysis of Water Supply Heat Pump's Capability of Energy Storage and Energy Saving Using Electricity%水源热泵系统蓄能节能的可行性

    Institute of Scientific and Technical Information of China (English)

    吴薇; 张小松

    2002-01-01

    In this paper, the characteristic of water supply heat pump (WLHP) is introduced. The thermal performanceand effect of energy saving that can be used to heating and cooling at the same time (the distinctive working mode) is em-phasized. A new idea of heat input using wave trough electricity instead of boilers is brought up, the effect and significance ofthis new method is discussed.

  2. Pump element for a tube pump

    DEFF Research Database (Denmark)

    2011-01-01

    The invention relates to a tube pump comprising a tube and a pump element inserted in the tube, where the pump element comprises a rod element and a first and a second non-return valve member positioned a distance apart on the rod element. The valve members are oriented in the same direction rela...... to a part of the tube. The invention further relates to a method for creating a flow of a fluid within an at least partly flexible tube by means of a pump element as mentioned above.......The invention relates to a tube pump comprising a tube and a pump element inserted in the tube, where the pump element comprises a rod element and a first and a second non-return valve member positioned a distance apart on the rod element. The valve members are oriented in the same direction...... portion acts to alternately close and open the valve members thereby generating a fluid flow through the tube. The invention further relates to a pump element comprising at least two non-return valve members connected by a rod element, and for insertion in an at least partly flexible tube in such tube...

  3. Battery energy storage technologies

    Science.gov (United States)

    Anderson, Max D.; Carr, Dodd S.

    1993-03-01

    Battery energy storage systems, comprising lead-acid batteries, power conversion systems, and control systems, are used by three main groups: power generating utilities, power distributing utilities, and major power consumers (such as electric furnace foundries). The principal advantages of battery energy storage systems to generating utilities include load leveling, frequency control, spinning reserve, modular construction, convenient siting, no emissions, and investment deferral for new generation and transmission equipment. Power distributing utilities and major power consumers can avoid costly demand changes by discharging their batteries at peak periods and then recharging with lower cost off-peak power (say, at night). Battery energy storage systems are most cost effective when designed for discharge periods of less than 5 h; other systems (for example, pumped water storage) are better suited for longer discharges. It is estimated that by the year 2000 there will be a potential need for 4000 MW of battery energy storage. New construction of five plants totaling 100 MW is presently scheduled for completion by the Puerto Rico Electric Power Authority between 1992 and 1995.

  4. Proton pump inhibitors

    Science.gov (United States)

    Proton pump inhibitors (PPIs) are medicines that work by reducing the amount of stomach acid made by ... Proton pump inhibitors are used to: Relieve symptoms of acid reflux, or gastroesophageal reflux disease (GERD). This ...

  5. Charge-pump voltage converter

    Science.gov (United States)

    Brainard, John P.; Christenson, Todd R.

    2009-11-03

    A charge-pump voltage converter for converting a low voltage provided by a low-voltage source to a higher voltage. Charge is inductively generated on a transfer rotor electrode during its transit past an inductor stator electrode and subsequently transferred by the rotating rotor to a collector stator electrode for storage or use. Repetition of the charge transfer process leads to a build-up of voltage on a charge-receiving device. Connection of multiple charge-pump voltage converters in series can generate higher voltages, and connection of multiple charge-pump voltage converters in parallel can generate higher currents. Microelectromechanical (MEMS) embodiments of this invention provide a small and compact high-voltage (several hundred V) voltage source starting with a few-V initial voltage source. The microscale size of many embodiments of this invention make it ideally suited for MEMS- and other micro-applications where integration of the voltage or charge source in a small package is highly desirable.

  6. 大型抽水蓄能机组定子绕组固定技术与状态评价的分析%Analysis of Stator Winding Fixation Techniques and Its Condition Evaluation for Large Pump-Storage Units

    Institute of Scientific and Technical Information of China (English)

    赵贵前

    2015-01-01

    大型抽水蓄能发电电动机定子绕组固定采用了弹性固定工艺,本文总结了多种弹性固定系统,列举了事故案例,分析了定子绕组固定系统状态评价的方法,供大型抽水蓄能发电机定子绕组固定系统设计和运行维护人员参考借鉴。%Elastic wingding fixation techniques have been used in stator winding support systems for large pump-storage units. This paper sums up some form of elastic windingfi xation techniques, cites one generator accident, analysis the condition evaluation of stator winding support systems . It have certain reference value for the designer and maintainer.

  7. 广州蓄能水电厂B厂机组导叶轴套密封漏水故障分析与处理%Analysis and Solution about the Gate Stem Seal Leakage Fault of Guangzhou Pumped Storage Power Station B Unit

    Institute of Scientific and Technical Information of China (English)

    袁丰江

    2011-01-01

    With the unit in Guangzhou Pumped Storage Power Station B as an example,the water guide vane bushings and gate stem seal structure were introduced, the guide vane bushings seal leakage failures were analyzed to find the specific cause of the fault, and appropriate solution and preventive measures were implemented.%以广州蓄能水电厂B厂机组为例,介绍导水机构中导叶轴套及轴套密封的结构构成,对导叶轴套密封漏水故障进行分析,找到了故障的具体原因,并实施了相应的处理和预防措施.

  8. Pump for Saturated Liquids

    Science.gov (United States)

    Elliott, D. G.

    1986-01-01

    Boiling liquids pumped by device based on proven components. Expanding saturated liquid in nozzle and diverting its phases along separate paths in liquid/vapor separator raises pressure of liquid. Liquid cooled in process. Pump makes it unnecessary to pressurize cryogenic liquids in order to pump them. Problems of introducing noncondensable pressurizing gas avoided.

  9. Ring wall storages. An essential contribution of the geotechnics to te energy storage; Ringwallspeicher. Ein essentieller Beitrag der Geotechnik zur Energiespeicherung

    Energy Technology Data Exchange (ETDEWEB)

    Popp, Matthias [Matthias Popp Ingenieurbuero Erneuerbare Energien, Energiespeicherung, Wuppertal (Germany)

    2012-11-01

    The author of the contribution under consideration reports on ring wall storages as an essential contribution to the geotechnical engineering for energy storage. At first, renewable energies as well as the storage requirements for the compensation of the volatility of electricity from wind power and solar energy are described. Subsequently, the storage technologies for energy management requirements as well as the need for water and land area of pumped storage systems are presented with special emphasis of ring wall storages.

  10. Opinions on Ball Valve Participating in Regulation Guarantee When Pump-storaged Units Reject the Load%对抽水蓄能电站球阀参与机组甩负荷流量调节的几点看法

    Institute of Scientific and Technical Information of China (English)

    韩伶俐

    2013-01-01

    There are 4 sets of 300MW reversible storage units in a pumped storage power station. When the units reject the load, ball valves participate in adjusting of transient process. This article introduces calculation results of regulation guarantee provided by design institute and manufactory, and testing result of the units load-rejection at site, discusses the advantages and disadvantages on the ball valve’s participation in adjusting of transient process, and gives some advice.%  国内某抽水蓄能电站安装有4台单机容量为300MW的可逆式抽水蓄能机组,机组在发电工况甩负荷时球阀参与水力过渡过程调节。文章介绍了设计单位和制造厂商提供的机组调节保证计算成果,以及现场机组甩负荷试验结果,探讨了球阀参与机组甩负荷流量调节的利弊,并给出了建议。

  11. Southern company energy storage study :

    Energy Technology Data Exchange (ETDEWEB)

    Ellison, James; Bhatnagar, Dhruv; Black, Clifton; Jenkins, Kip

    2013-03-01

    This study evaluates the business case for additional bulk electric energy storage in the Southern Company service territory for the year 2020. The model was used to examine how system operations are likely to change as additional storage is added. The storage resources were allowed to provide energy time shift, regulation reserve, and spinning reserve services. Several storage facilities, including pumped hydroelectric systems, flywheels, and bulk-scale batteries, were considered. These scenarios were tested against a range of sensitivities: three different natural gas price assumptions, a 15% decrease in coal-fired generation capacity, and a high renewable penetration (10% of total generation from wind energy). Only in the elevated natural gas price sensitivities did some of the additional bulk-scale storage projects appear justifiable on the basis of projected production cost savings. Enabling existing peak shaving hydroelectric plants to provide regulation and spinning reserve, however, is likely to provide savings that justify the project cost even at anticipated natural gas price levels. Transmission and distribution applications of storage were not examined in this study. Allowing new storage facilities to serve both bulk grid and transmission/distribution-level needs may provide for increased benefit streams, and thus make a stronger business case for additional storage.

  12. Packaging design criteria, transfer and disposal of 102-AP mixer pump

    Energy Technology Data Exchange (ETDEWEB)

    Carlstrom, R.F.

    1994-11-23

    A mixer pump installed in storage tank 241-AP-102 (102-AP) has failed. This pump is referred to as the 102-AP mixer pump (APMP). The APMP will be removed from 102-AP 1 and a new pump will be installed. The main purpose of the Packaging Design Criteria (PDC) is to establish criteria necessary to design and fabricate a shipping container for the transfer and storage of the APMP from 102-AP. The PDC will be used as a guide to develop a Safety Evaluation for Packaging (SEP).

  13. Proceedings of the DOE chemical energy storage and hydrogen energy systems contracts review

    Energy Technology Data Exchange (ETDEWEB)

    1980-02-01

    Sessions were held on electrolysis-based hydrogen storage systems, hydrogen production, hydrogen storage systems, hydrogen storage materials, end-use applications and system studies, chemical heat pump/chemical energy storage systems, systems studies and assessment, thermochemical hydrogen production cycles, advanced production concepts, and containment materials. (LHK)

  14. Performance of a solar augmented heat pump

    Science.gov (United States)

    Bedinger, A. F. G.; Tomlinsin, J. J.; Reid, R. L.; Chaffin, D. J.

    Performance results from a test house equipped with a parallel solar augmented heat pump system with off-peak storage and a utility interconnection back-up, are presented. The collector array consisted of 12 air heating flat plates with a 9 l/sec flow. Thermal storage was consigned to a 260 cu ft crushed limestone pebble bed, with an 8.8 kW heat pump used to draw heat from storage during off-peak hours and a 15 kW electrical resistance heater used to charge the pebble bed. Monitoring and data recording were carried out on all energy inputs and outputs of the systems, and a modified TRNSYS program was employed to model the system performance. The data indicate that although the system offered the possibility of reducing the utility capacity, the addition of the solar system did not significantly augment the performance of the heat-pump system, at least in terms of the cost of supplementary electricity.

  15. Ground coupled solar heat pumps: analysis of four options

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, J.W.

    1981-01-01

    Heat pump systems which utilize both solar energy and energy withdrawn from the ground are analyzed using a simplified procedure which optimizes the solar storage temperature on a monthly basis. Four ways of introducing collected solar energy to the system are optimized and compared. These include use of actively collected thermal input to the heat pump; use of collected solar energy to heat the load directly (two different ways); and use of a passive option to reduce the effective heating load.

  16. APS storage ring vacuum system

    Energy Technology Data Exchange (ETDEWEB)

    Niemann, R.C.; Benaroya, R.; Choi, M.; Dortwegt, R.J.; Goeppner, G.A.; Gonczy, J.; Krieger, C.; Howell, J.; Nielsen, R.W.; Roop, B.; Wehrle, R.B.

    1990-01-01

    The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's experimental program. The Storage Ring's 1104 m circumference is divided into 40 functional sectors. The sectors include vacuum, beam transport, control, acceleration and insertion device components. The vacuum system, which is designed to operate at a pressure of 1 n Torr, consists of 240 connected sections, the majority of which are fabricated from an aluminum alloy extrusion. The sections are equipped with distributed NeG pumping, photon absorbers with lumped pumping, beam position monitors, vacuum diagnostics and valving. The details of the vacuum system design, selected results of the development program and general construction plans are presented. 11 refs., 6 figs., 3 tabs.

  17. Energy storage

    CERN Document Server

    Brunet, Yves

    2013-01-01

    Energy storage examines different applications such as electric power generation, transmission and distribution systems, pulsed systems, transportation, buildings and mobile applications. For each of these applications, proper energy storage technologies are foreseen, with their advantages, disadvantages and limits. As electricity cannot be stored cheaply in large quantities, energy has to be stored in another form (chemical, thermal, electromagnetic, mechanical) and then converted back into electric power and/or energy using conversion systems. Most of the storage technologies are examined: b

  18. Detection of pump degradation

    Energy Technology Data Exchange (ETDEWEB)

    Greene, R.H.; Casada, D.A.; Ayers, C.W. [and others

    1995-08-01

    This Phase II Nuclear Plant Aging Research study examines the methods of detecting pump degradation that are currently employed in domestic and overseas nuclear facilities. This report evaluates the criteria mandated by required pump testing at U.S. nuclear power plants and compares them to those features characteristic of state-of-the-art diagnostic programs and practices currently implemented by other major industries. Since the working condition of the pump driver is crucial to pump operability, a brief review of new applications of motor diagnostics is provided that highlights recent developments in this technology. The routine collection and analysis of spectral data is superior to all other technologies in its ability to accurately detect numerous types and causes of pump degradation. Existing ASME Code testing criteria do not require the evaluation of pump vibration spectra but instead overall vibration amplitude. The mechanical information discernible from vibration amplitude analysis is limited, and several cases of pump failure were not detected in their early stages by vibration monitoring. Since spectral analysis can provide a wealth of pertinent information concerning the mechanical condition of rotating machinery, its incorporation into ASME testing criteria could merit a relaxation in the monthly-to-quarterly testing schedules that seek to verify and assure pump operability. Pump drivers are not included in the current battery of testing. Operational problems thought to be caused by pump degradation were found to be the result of motor degradation. Recent advances in nonintrusive monitoring techniques have made motor diagnostics a viable technology for assessing motor operability. Motor current/power analysis can detect rotor bar degradation and ascertain ranges of hydraulically unstable operation for a particular pump and motor set. The concept of using motor current or power fluctuations as an indicator of pump hydraulic load stability is presented.

  19. Detection of pump degradation

    Energy Technology Data Exchange (ETDEWEB)

    Casada, D. [Oak Ridge National Lab., TN (United States)

    1995-04-01

    There are a variety of stressors that can affect the operation of centrifugal pumps. Although these general stressors are active in essentially all centrifugal pumps, the stressor level and the extent of wear and degradation can vary greatly. Parameters that affect the extent of stressor activity are manifold. In order to assure the long-term operational readiness of a pump, it is important to both understand the nature and magnitude of the specific degradation mechanisms and to monitor the performance of the pump. The most commonly applied method of monitoring the condition of not only pumps, but rotating machinery in general, is vibration analysis. Periodic or continuous special vibration analysis is a cornerstone of most pump monitoring programs. In the nuclear industry, non-spectral vibration monitoring of safety-related pumps is performed in accordance with the ASME code. Pump head and flow rate are also monitored, per code requirements. Although vibration analysis has dominated the condition monitoring field for many years, there are other measures that have been historically used to help understand pump condition; advances in historically applied technologies and developing technologies offer improved monitoring capabilities. The capabilities of several technologies (including vibration analysis, dynamic pressure analysis, and motor power analysis) to detect the presence and magnitude of both stressors and resultant degradation are discussed.

  20. Optically pumped atoms

    CERN Document Server

    Happer, William; Walker, Thad

    2010-01-01

    Covering the most important knowledge on optical pumping of atoms, this ready reference is backed by numerous examples of modelling computation for optical pumped systems. The authors show for the first time that modern scientific computing software makes it practical to analyze the full, multilevel system of optically pumped atoms. To make the discussion less abstract, the authors have illustrated key points with sections of MATLAB codes. To make most effective use of contemporary mathematical software, it is especially useful to analyze optical pumping situations in the Liouville spa

  1. Champagne Heat Pump

    Science.gov (United States)

    Jones, Jack A.

    2004-01-01

    The term champagne heat pump denotes a developmental heat pump that exploits a cycle of absorption and desorption of carbon dioxide in an alcohol or other organic liquid. Whereas most heat pumps in common use in the United States are energized by mechanical compression, the champagne heat pump is energized by heating. The concept of heat pumps based on other absorption cycles energized by heat has been understood for years, but some of these heat pumps are outlawed in many areas because of the potential hazards posed by leakage of working fluids. For example, in the case of the water/ammonia cycle, there are potential hazards of toxicity and flammability. The organic-liquid/carbon dioxide absorption/desorption cycle of the champagne heat pump is similar to the water/ammonia cycle, but carbon dioxide is nontoxic and environmentally benign, and one can choose an alcohol or other organic liquid that is also relatively nontoxic and environmentally benign. Two candidate nonalcohol organic liquids are isobutyl acetate and amyl acetate. Although alcohols and many other organic liquids are flammable, they present little or no flammability hazard in the champagne heat pump because only the nonflammable carbon dioxide component of the refrigerant mixture is circulated to the evaporator and condenser heat exchangers, which are the only components of the heat pump in direct contact with air in habitable spaces.

  2. Resonance wave pumping: wave mass transport pumping

    Science.gov (United States)

    Carmigniani, Remi; Violeau, Damien; Gharib, Morteza

    2016-11-01

    It has been previously reported that pinching at intrinsic resonance frequencies a valveless pump (or Liebau pump) results in a strong pulsating flow. A free-surface version of the Liebau pump is presented. The experiment consists of a closed tank with a submerged plate separating the water into a free-surface and a recirculation section connected through two openings at each end of the tank. A paddle is placed at an off-centre position at the free-surface and controlled in a heaving motion with different frequencies and amplitudes. Near certain frequencies identified as resonance frequencies through a linear potential theory analysis, the system behaves like a pump. Particle Image Velocimetry (PIV) is performed in the near free surface region and compared with simulations using Volume of Fluid (VOF) method. The mean eulerian mass flux field (ρ) is extracted. It is observed that the flow is located in the vicinity of the surface layer suggesting Stokes Drift (or Wave Mass Transport) is the source of the pumping. A model is developped to extend the linear potential theory to the second order to take into account these observations. The authors would like to acknowledge the Gordon and Betty Moore Foundation for their generous support.

  3. Researche on heat transfer characteristics of brackish aquifers upon synchronization pumping and inj ection energy storage mode%多井同期抽灌储能模式咸水层热运移特性研究

    Institute of Scientific and Technical Information of China (English)

    马玖辰; 刘雪玲; 张志刚

    2015-01-01

    In order to revise and improve the current numerical model of energy storage and recovery system in aquifers, a three-dimensional coupled numerical model of groundwater flow and heat transfer and solute movement in brackish aquifers was established based upon the thermal and mass transfer in porous media,fully making use of the significant variation of groundwater density and viscosity coefficient in energy storage and recovery in brackish aquifer.The calibrated numerical model was used to explore into the thermal transfer characteristics and the variation regularity of the geo-temperature field in different energy storage modes.The numerical predictions indicate that the thermal radius changing rates are respectively 0.272,0.008,0.348 m/d,-0.040 m/d in the coarse silt aquifer when the original brackish solution and the deionization solution recharge during the heat storage period and the intermittent recovery period.The results also show that the seepage velocity of groundwater increases while the recharge solution salinity decreases and the temperature increases during the energy storage stage,which intensifies heat convection and thermal dispersion and then increases the influence scope and range of the recharge solution temperature field. During the intermittent stage,the salinity gradient between the original brackish solution and solution recharge becomes larger when the inj ection salinity decreases and the mechanical dispersion capability becomes stronger,which shrinks the thermal radius of the infiltration solution in brackish aquifers.%基于含水层储能水、热运移的基本理论与控制方程,针对地下咸水层储能过程中渗流溶液密度及黏滞系数变化显著的特点,对现有的地下含水层储能数学模型进行修正、完善,建立地下咸水层耦合储能模型,探索不同储能模式下含水层温度场变化规律及阶段性热量运移特征。研究结果得到,采用地下原水与去离子水回灌时

  4. Analysis of Large- Capacity Water Heaters in Electric Thermal Storage Programs

    Energy Technology Data Exchange (ETDEWEB)

    Cooke, Alan L. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Anderson, David M. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Winiarski, David W. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Carmichael, Robert T. [Cadeo Group, Washington D. C. (United States); Mayhorn, Ebony T. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fisher, Andrew R. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2015-03-17

    This report documents a national impact analysis of large tank heat pump water heaters (HPWH) in electric thermal storage (ETS) programs and conveys the findings related to concerns raised by utilities regarding the ability of large-tank heat pump water heaters to provide electric thermal storage services.

  5. Simulation on Ground Source Heat Pump System Combined with Seasonal Air Thermal Energy Storage%季节性蓄存空气热能的地源热泵空调系统模拟

    Institute of Scientific and Technical Information of China (English)

    韩宗伟; 丁慧婷; 李先庭; 史永征

    2012-01-01

    Regarding the problem of ground heat balance in cold area,a ground source heat pump system which can seasonally accumulate environmental air thermal energy was presented.The components and operation modes of the system were introduced,and the control strategy of system operation was determined through setting up the mathematic model of each system section.Based on the mathematic model and control strategy,the transient numerical simulation was carried out for an office building in Harbin.The simulation results show that the ground source heat pump system can retain thermal balance of the soil temperature field over an one year cycle.The average coefficient of performance was calculated to be 2.44.Compared with that of the coal-fired heating and air conditioning,the system energy-saving rate is 22.3%.%针对寒冷地区长期应用地源热泵系统出现的热平衡问题,提出了季节性蓄存环境空气热能的地源热泵供暖空调系统.介绍了该系统的组成及运行模式,建立了系统中各部分的数学模型,确定了系统的运行控制策略,并在此基础上,以哈尔滨地区某办公建筑为对象进行了瞬态数值模拟.由模拟结果可知,该系统能够保持土壤温度场以年为周期的热平衡,全年供暖空调平均性能系数为2.44,与燃煤锅炉供暖和分体空调供冷方案相比,该系统节能率为22.3%.

  6. Demanding pump power; Krevende pumpekraft

    Energy Technology Data Exchange (ETDEWEB)

    Lie, Oeyvind

    2011-07-01

    The potential for pump power in Norway is huge, but it is difficult to exploit it. Norway has some pumping plants, but these are built for seasonal pumping (pumping up to the magazine in the summer, and production in the winter). Pump power plants for short periods do not exist in Norway. (AG)

  7. Impact of Storage Technologies upon Power System Losses

    Directory of Open Access Journals (Sweden)

    DULAU Lucian Ioan

    2015-05-01

    Full Text Available The paper describes the main characteristics of storage technologies. The most important storage technologies are the batteries, hydrogen, pumped hydro, flywheels, compressed air, super-capacitors and superconducting magnetic devices. The storage technologies can be classified based on the function principle into electrochemical, mechanical and electromagnetic devices. The storage systems can also be classified based on their capacity to store power into short and long term devices. A power flow analysis is performed for the situation with and without a storage unit. The storage unit is inserted into the IEEE 14 bus test system.

  8. Model tests on a semi-axial pump turbine

    Energy Technology Data Exchange (ETDEWEB)

    Strohmer, F.; Horacek, G.

    1984-03-01

    Due to their good hydraulic characteristic semi-axial pump turbines are used in the medium head range of pumped storage plants. This paper describes model tests performed on a semiaxial pump turbine model and shows the results of these tests. The aim of the model tests was the optimization of the hydraulic water passage, the measurement of the hydraulic characteristics over the whole operating range, the investigation of the cavitation behaviour, the investigation of the hydraulic forces and torques as well as the proof of the values guaranteed to the customer.

  9. Pump element for a tube pump

    DEFF Research Database (Denmark)

    2011-01-01

    relative to the rod element so as to allow for a fluid flow in the tube through the first valve member, along the rod element, and through the second valve member. The tube comprises an at least partly flexible tube portion between the valve members such that a repeated deformation of the flexible tube...... portion acts to alternately close and open the valve members thereby generating a fluid flow through the tube. The invention further relates to a pump element comprising at least two non-return valve members connected by a rod element, and for insertion in an at least partly flexible tube in such tube...... pump as mentioned above, thereby acting to generate a fluid flow through the tube upon repeated deformation of the tube between the two valve members. The pump element may comprise a connecting part for coupling to another tube and may comprise a sealing part establishing a fluid tight connection...

  10. Probe Storage

    NARCIS (Netherlands)

    Gemelli, Marcellino; Abelmann, Leon; Engelen, Johan B.C.; Khatib, Mohammed G.; Koelmans, Wabe W.; Zaboronski, Olog; Campardo, Giovanni; Tiziani, Federico; Laculo, Massimo

    2011-01-01

    This chapter gives an overview of probe-based data storage research over the last three decades, encompassing all aspects of a probe recording system. Following the division found in all mechanically addressed storage systems, the different subsystems (media, read/write heads, positioning, data chan

  11. Atomic storage

    CERN Multimedia

    Ricadela, A

    2003-01-01

    IBM is supplying CERN, the European Organization for Nuclear Research, with its Storage Tank file system virtualization software, 20 terabytes of storage capacity, and services under a three-year deal to build computer systems that will support the Large Hadron Collider accelerator (1 paragraph).

  12. 管翅式热泵相变储能器的数值模拟%Numerical Simulation of Fin-tube Heat Pump with Phase Change Thermal Storage

    Institute of Scientific and Technical Information of China (English)

    朱冬生; 徐婷; 杨硕; 叶为标; 汪南; 巨小平

    2011-01-01

    In order to study the aluminum finned tube heat transfer properties of PCM, through the model and the numerical simulation method to have fins and no finned heat transfer performance of the storage unit. Study the influence of fin spacing(w)、thickness (2v)and thermal conductivity of PCM (kpcm) on total exothermic time. Comparing with a wingless energy storage unit,the solidification time reduced to 10%. The fin spacing and the total exothermic has a linear relation. The results show that aluminum fin greatly enhance the heat transfer of the phase transition process, especially the heat transfer coefficient of the PCM lower than 0.5 W/(m· K).%为了研究铝翅片管对相变储能材料(PCM)传热性质的影响,通过建立模型数值模拟的方法对有翅片和无翅片的储能单元的传热性能进行了对比.研究了翅片间距(w)、铝片厚度(2v)、相变材料导热系数(kpcm)等参数对总放热时间的影响.在有翅片的情况下,储热单元凝固的时间比无翅片时减少了90%,而翅片间距和总放热时间近似呈线性关系.得出铝翅片可以大大加强相变过程传热、特别是对导热系数小于0.5W/(m·K)的PCM强化效果非常明显.

  13. A Shocking New Pump

    Science.gov (United States)

    2000-01-01

    Hydro Dynamics, Inc. received a technical helping hand from NASA that made their Hydrosonic Pump (HPump) a reality. Marshall engineers resolved a bearing problem in the rotor of the pump and recommended new bearings, housings and mounting hardware as a solution. The resulting HPump is able to heat liquids with greater energy efficiency using shock waves to generate heat.

  14. Water Treatment Technology - Pumps.

    Science.gov (United States)

    Ross-Harrington, Melinda; Kincaid, G. David

    One of twelve water treatment technology units, this student manual on pumps provides instructional materials for three competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: types of pumps in plant and distribution systems, pump…

  15. Influence of heat storage mode of domestic hot water on the performance of ground heat exchanger in ground-source heat pump system%卫生热水蓄热方式对地埋管换热性能的影响分析

    Institute of Scientific and Technical Information of China (English)

    王勇; 唐曦

    2012-01-01

    竖埋管地源热泵系统为室内环境控制提供冷热量。在空调工况下,热回收机组可以提供卫生热水。卫生热水的供应在冬夏不同的运行模式下,对地埋管的换热性能影响不同。通过某地源热泵工程设计,分析了冬夏季卫生热水系统在蓄热方式下对地源热泵系统地埋管换热性能的影响。利用卫生热水的蓄热能力,对地埋管换热器在不同工况下的动态换热性能进行了对比分析,并通过数值计算得到了不同运行模式下地埋管的换热性能参数。根据计算结果提出了在该工程负荷特性下的系统调节方式。%The vertical U-tube ground-coupled heat pump system provides cold and heat for the controlling of indoor environment.Under the air-conditioning condition,the vertical U-tube ground-coupled heat pump system with heat recovery can provide domestic hot water.The influence of supplying domestic hot water on the heat transfer performance of ground heat exchangers is different under different operating modes in summer and winter.Through a project design of ground-source heat pump system,the influence of supplying domestic hot water under heat storage mode on the heat transfer performance of ground heat exchangers in summer and winter is respectively analyzed.The dynamic performance of heat exchangers under different working conditions is analyzed,and through numerical calculation,the heat transfer performance parameters of ground heat exchangers under different operating modes are obtained.From the calculation results,the adjusting methods based on the load characteristics of this project represent.

  16. Review of magnetohydrodynamic pump applications

    National Research Council Canada - National Science Library

    Al-Habahbeh, O.M; Al-Saqqa, M; Safi, M; Abo Khater, T

    2016-01-01

    Magneto-hydrodynamic (MHD) principle is an important interdisciplinary field. One of the most important applications of this effect is pumping of materials that are hard to pump using conventional pumps...

  17. Numerical simulation of seasonal groundwater pumping

    Science.gov (United States)

    Filimonova, Elena; Baldenkov, Mikhail

    2015-04-01

    Increasing scarcity and contamination of water recourses require innovative water management strategies such as combined water system. The combined water system is a complex technology comprising two separate wells, major catchment-zone well and compensation pumping well, located inside a single stream basin. The major well is supplied by the well's catchment zone or surface flow, thus depleting the stream flow. The pumping rate of a major well is determined by the difference between the current stream flow and the minimum permissible stream flow. The deficiency of the stream flow in dry seasons can be compensated for by the short-term pumping of groundwater. The compensation pumping rate is determined by the difference between water demand and the permissible water withdrawal of the major well. The source for the compensation well is the aquifer storage. The estimation of streamflow depletion caused by compensation pumping is major question to evaluate the efficiency of the combined water system. Short-term groundwater pumping can use aquifer storage instead of catchment-zone water until the drawdown reaches the edge of the stream. Traditionally pumping simulation calculates in two-step procedure. Natural conditions, an aquifer system is in an approximate dynamic equilibrium, describe by steady-state model. A steady-state solution provides an initial heads, a set of flows through boundaries, and used as initial state for transient solutions, when pumping is imposed on an aquifer system. The transient solutions provide the total change in flows through the boundaries. A difference between the transient and steady-state solutions estimates the capture and the streamflow depletion. Numerical modeling of cyclical compensation pumping has special features: the periodic solution, the seasonal changes through the boundaries and the importance even small drawdown of stream level. When seasonality is a modeling feature, traditional approach leads to mistaken values of

  18. Computer system design description for the spare pump mini-dacs data acquisition and control system

    Energy Technology Data Exchange (ETDEWEB)

    Vargo, G.F. Jr.

    1994-09-29

    The attached document outlines the computer software design for the mini data acquisition and control system (DACS), that supports the testing of the spare pump for Tank 241-SY-101, at the maintenance and storage facility (MASF).

  19. Pumping machinery theory and practice

    CERN Document Server

    Badr, Hassan M

    2014-01-01

    Pumping Machinery Theory and Practice comprehensively covers the theoretical foundation and applications of pumping machinery. Key features: Covers characteristics of centrifugal pumps, axial flow pumps and displacement pumpsConsiders pumping machinery performance and operational-type problemsCovers advanced topics in pumping machinery including multiphase flow principles, and two and three-phase flow pumping systemsCovers different methods of flow rate control and relevance to machine efficiency and energy consumptionCovers different methods of flow rate control and relevance to machine effi

  20. Gray-box modelling approach for description of storage tunnel

    DEFF Research Database (Denmark)

    Harremoës, Poul; Carstensen, Jacob

    1999-01-01

    of the water in the overflow structures. The capacity of a pump draining the storage tunnel is estimated for two different rain events, revealing that the pump was malfunctioning during the first rain event. The proposed modeling approach can be used in automated online surveillance and control and implemented....... The model in the present paper provides on-line information on overflow volumes, pumping capacities, and remaining storage capacities. A linear overflow relation is found, differing significantly from the traditional deterministic modeling approach. The linearity of the formulas is explained by the inertia...

  1. Feasibility in photovoltaic pumping systems; Fiabilidad en sistemas de bombeo fotovoltaico

    Energy Technology Data Exchange (ETDEWEB)

    Narvarte, I.; Poza, F.; Lorenzo, E.

    2004-07-01

    In spite of the high reliability of PV pumping technology, PV pumping programs show that there are numerous problems when the whole system is evaluated: pumping, storage and distribution. Therefore, reality suggests the convenience of implementing quality assurance procedures taking into account the whole water chain. This paper presents how a current PV program in the Maghreb has faced up this challenge by elaborating technical specifications, carrying out quality tests, and developing testing procedures and facilities locally reproducible. (Author)

  2. Influence of individual heat pumps on wind power integration – Energy system investments and operation

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Münster, Marie

    2013-01-01

    Individual heat pumps are expected to constitute a significant electricity demand in future energy systems. This demand becomes flexible if investing in complementing heat storage capabilities. In this study, we analyse how the heat pumps can influence the integration of wind power by applying...

  3. Energy storage technology - Environmental implications of large scale utilization

    Science.gov (United States)

    Krupka, M. C.; Moore, J. E.; Keller, W. E.; Baca, G. A.; Brasier, R. I.; Bennett, W. S.

    Environmental effects are identified for several energy storage technologies including advanced lead-acid battery, compressed air, underground pumped hydroelectric, flywheel, superconducting magnet, and various thermal systems. A preliminary study on fuel cell technology is also reported. New applications for energy storage technologies and the additional costs of controls to be used for mitigation of specific impacts are briefly discussed.

  4. Safety systems for the ESES 2002 wind pump

    Energy Technology Data Exchange (ETDEWEB)

    El Agamawy, H. [Engine Factory, Doki (Egypt)

    2001-07-01

    The ESES 2002 wind pump, a 4.6 m rotor diameter high-performance water pumping windmill, was tested at four different sites (Cairo, Giza, Wadi El Natroun and El-Tor city on the Red Sea coast) from September 1997 to July 1999. These machines utilize a 3:1 gearbox and a hydrodynamic sealing piston pump. These four ESES 2002 wind pumps were tested by pumping from a motionless water depth of 3 in up to an 84 m deep well. A variety of pump diameter sizes varying from 64 to 1400 mm were used. The water pumped was returned to the well after flowing through a settling storage tank having a capacity of 3 m{sup 3}. The instrumentation provided a 16 channel data acquisition system to accurately measure the machine performance, including rotor rpm, number of stroke, starting wind speed, flow rate, tail furl angle and other variables. The results verify that the ESES 2002 wind pump is a robust machine as two machines have been running for 2 years continuously without requiring any replacement parts or major or minor maintenance. (author)

  5. 太阳能蓄热与低温空气源热泵复合空调系统运行特性模拟研究%SIMULATION RESEARCH ON LOW TEMPERATURE AIR SOURCE HEAT PUMP SYSTEM COMBINED WITH THERMAL STORAGE OF SOLAR ENERGY

    Institute of Scientific and Technical Information of China (English)

    韩宗伟; 李先庭; 石文星; 史永征

    2012-01-01

    The components and operation modes of the low temperature air source heat pump system ( LTASHP) combined with thermal storage of solar energy were introduced in this paper. The mathematics models of each section of the system were set up and the control strategy of system operation was determined. Based on the mathematics models and control strategy, a canteen in Urumqi City was taken as the research object, and the transient numerical simulation was carried out. The operation characteristic of the system for whole-year was comparatively analyzed. The simulation results provide a theoretical guidance for promoting application of the system.%介绍了利用地下水池进行季节性蓄热的太阳能与低温空气源热泵复合空调系统的组成及运行模式,建立系统中各部分的数学模型,确定系统的运行控制策略,并在此基础上,以乌鲁木齐市某餐厅为研究对象进行瞬态数值模拟,得到系统的全年动态运行特性,模拟结果为该系统的推广应用提供了理论指导.

  6. Pump power in Norway: the costs and a potential prospect; Pumpekraft i Noreg: kostnadar og utsikter til potensial

    Energy Technology Data Exchange (ETDEWEB)

    Hamnaberg, Haavard

    2011-07-01

    Pumped storage power plants have long been used to regulate the production relative variations in consumption, but there is no preliminary pumping power plant in Norway built to regulate on short terms. To increase the knowledge about the possibilities to establish a pumping power plant in Norway, NVE has therefore been made a study of how pumping power can be drawn up and what it costs to build pumped storage plant between already existing magazine. One can not just based on cost and design conclude anything about the potential for pumped storage plant in Norway, but it is a start of a work that might make it easier to assess to what extent this may be possible. (eb)

  7. Design of Shaft Inlet/Outlet in Upper Reservoir of Liyang Pumped-storage Power Station%溧阳抽水蓄能电站上水库竖井式进/出水口设计

    Institute of Scientific and Technical Information of China (English)

    胡旺兴; 杨亚军; 李冲; 谭永华

    2013-01-01

    溧阳抽水蓄能电站上水库进/出水口为竖井式,具有结构复杂、规模庞大、地质条件较差等特点.采用数值分析方法对各设计方案进行了分析比较,并对选定的方案进行了水力模型试验验证,设计选用的体形具有较好的水力条件;进/出水口塔体上部采用框架结构,并采用无拦污栅的设计方案;通过扩大基础直径,增强结构抗倾覆稳定及地基应力的要求,解决了水力学、结构设计和基础处理等方面存在一系列的技术难题.%The inlet/outlet of upper reservoir in Liyang Pumped—storage Power Station is shaft—type with complex structure, large scale and poor foundation geological condition. Different design options of inlet/outlet are compared by numerical analysis method and the selected design option is tested by hydraulic model. The final design option has better hydraulic structure. The frame structure is chosen for the upper body of inlet/outlet tower and there is no trashrack in design. The stability against overturning and the requirements on foundation stress are met by expanding base diameter of inlet/outlet. These measures solve a series of technical problems in hydraulic design, structure design and foundation treatment of inlet/outlet.

  8. Energy Storage Project

    Science.gov (United States)

    Mercer, Carolyn R.; Jankovsky, Amy L.; Reid, Concha M.; Miller, Thomas B.; Hoberecht, Mark A.

    2011-01-01

    NASA's Exploration Technology Development Program funded the Energy Storage Project to develop battery and fuel cell technology to meet the expected energy storage needs of the Constellation Program for human exploration. Technology needs were determined by architecture studies and risk assessments conducted by the Constellation Program, focused on a mission for a long-duration lunar outpost. Critical energy storage needs were identified as batteries for EVA suits, surface mobility systems, and a lander ascent stage; fuel cells for the lander and mobility systems; and a regenerative fuel cell for surface power. To address these needs, the Energy Storage Project developed advanced lithium-ion battery technology, targeting cell-level safety and very high specific energy and energy density. Key accomplishments include the development of silicon composite anodes, lithiated-mixed-metal-oxide cathodes, low-flammability electrolytes, and cell-incorporated safety devices that promise to substantially improve battery performance while providing a high level of safety. The project also developed "non-flow-through" proton-exchange-membrane fuel cell stacks. The primary advantage of this technology set is the reduction of ancillary parts in the balance-of-plant--fewer pumps, separators and related components should result in fewer failure modes and hence a higher probability of achieving very reliable operation, and reduced parasitic power losses enable smaller reactant tanks and therefore systems with lower mass and volume. Key accomplishments include the fabrication and testing of several robust, small-scale nonflow-through fuel cell stacks that have demonstrated proof-of-concept. This report summarizes the project s goals, objectives, technical accomplishments, and risk assessments. A bibliography spanning the life of the project is also included.

  9. Nuclear-pumped lasers

    CERN Document Server

    Prelas, Mark

    2016-01-01

    This book focuses on Nuclear-Pumped Laser (NPL) technology and provides the reader with a fundamental understanding of NPLs, a review of research in the field, and exploration of large scale NPL system design and applications. Early chapters look at the fundamental properties of lasers, nuclear-pumping and nuclear reactions that may be used as drivers for nuclear-pumped lasers. The book goes on to explore the efficient transport of energy from the ionizing radiation to the laser medium and then the operational characteristics of existing nuclear-pumped lasers. Models based on Mathematica, explanations and a tutorial all assist the reader’s understanding of this technology. Later chapters consider the integration of the various systems involved in NPLs and the ways in which they can be used, including beyond the military agenda. As readers will discover, there are significant humanitarian applications for high energy/power lasers, such as deflecting asteroids, space propulsion, power transmission and mining....

  10. Absorption heat pump system

    Science.gov (United States)

    Grossman, G.

    1982-06-16

    The efficiency of an absorption heat pump system is improved by conducting liquid from a second stage evaporator thereof to an auxiliary heat exchanger positioned downstream of a primary heat exchanger in the desorber of the system.

  11. High Voltage Charge Pump

    KAUST Repository

    Emira, Ahmed A.

    2014-10-09

    Various embodiments of a high voltage charge pump are described. One embodiment is a charge pump circuit that comprises a plurality of switching stages each including a clock input, a clock input inverse, a clock output, and a clock output inverse. The circuit further comprises a plurality of pumping capacitors, wherein one or more pumping capacitors are coupled to a corresponding switching stage. The circuit also comprises a maximum selection circuit coupled to a last switching stage among the plurality of switching stages, the maximum selection circuit configured to filter noise on the output clock and the output clock inverse of the last switching stage, the maximum selection circuit further configured to generate a DC output voltage based on the output clock and the output clock inverse of the last switching stage.

  12. Regenerative Hydride Heat Pump

    Science.gov (United States)

    Jones, Jack A.

    1992-01-01

    Hydride heat pump features regenerative heating and single circulation loop. Counterflow heat exchangers accommodate different temperatures of FeTi and LaNi4.7Al0.3 subloops. Heating scheme increases efficiency.

  13. Chiral brownian heat pump.

    Science.gov (United States)

    van den Broek, M; Van den Broeck, C

    2008-04-04

    We present the exact analysis of a chiral Brownian motor and heat pump. Optimization of the construction predicts, for a nanoscale device, frequencies of the order of kHz and cooling rates of the order of femtojoule per second.

  14. Chiral Brownian heat pump

    OpenAIRE

    Van Den Broek, Martijn; Van Den Broeck, Christian

    2007-01-01

    We present the exact analysis of a chiral Brownian motor and heat pump. Optimization of the construction predicts, for a nanoscale device, frequencies of the order of kHz and cooling rates of the order of femtojoule per second.

  15. Regenerative Hydride Heat Pump

    Science.gov (United States)

    Jones, Jack A.

    1992-01-01

    Hydride heat pump features regenerative heating and single circulation loop. Counterflow heat exchangers accommodate different temperatures of FeTi and LaNi4.7Al0.3 subloops. Heating scheme increases efficiency.

  16. Remotely Adjustable Hydraulic Pump

    Science.gov (United States)

    Kouns, H. H.; Gardner, L. D.

    1987-01-01

    Outlet pressure adjusted to match varying loads. Electrohydraulic servo has positioned sleeve in leftmost position, adjusting outlet pressure to maximum value. Sleeve in equilibrium position, with control land covering control port. For lowest pressure setting, sleeve shifted toward right by increased pressure on sleeve shoulder from servovalve. Pump used in aircraft and robots, where hydraulic actuators repeatedly turned on and off, changing pump load frequently and over wide range.

  17. Velocity selective optical pumping

    OpenAIRE

    Aminoff, C. G.; Pinard, M.

    1982-01-01

    We consider optical pumping with a quasi monochromatic tunable light beam, in the low intensity limit where a rate equation regime is obtained The velocity selective optical pumping (V.S.O.P.) introduces a correlation between atomic velocity and internal variables in the ground (or metastable) state. The aim of this article is to evaluate these atomic observables (orientation, alignment, population) as a function of velocity, using a phenomenological description of the relaxation effect of co...

  18. Lunar Base Heat Pump

    Science.gov (United States)

    Walker, D.; Fischbach, D.; Tetreault, R.

    1996-01-01

    The objective of this project was to investigate the feasibility of constructing a heat pump suitable for use as a heat rejection device in applications such as a lunar base. In this situation, direct heat rejection through the use of radiators is not possible at a temperature suitable for lde support systems. Initial analysis of a heat pump of this type called for a temperature lift of approximately 378 deg. K, which is considerably higher than is commonly called for in HVAC and refrigeration applications where heat pumps are most often employed. Also because of the variation of the rejection temperature (from 100 to 381 deg. K), extreme flexibility in the configuration and operation of the heat pump is required. A three-stage compression cycle using a refrigerant such as CFC-11 or HCFC-123 was formulated with operation possible with one, two or three stages of compression. Also, to meet the redundancy requirements, compression was divided up over multiple compressors in each stage. A control scheme was devised that allowed these multiple compressors to be operated as required so that the heat pump could perform with variable heat loads and rejection conditions. A prototype heat pump was designed and constructed to investigate the key elements of the high-lift heat pump concept. Control software was written and implemented in the prototype to allow fully automatic operation. The heat pump was capable of operation over a wide range of rejection temperatures and cooling loads, while maintaining cooling water temperature well within the required specification of 40 deg. C +/- 1.7 deg. C. This performance was verified through testing.

  19. BIOMATERIALS FOR ROTARY BLOOD PUMPS

    NARCIS (Netherlands)

    VANOEVEREN, W

    1995-01-01

    Rotary blood pumps are used for cardiac assist and cardiopulmonary support since mechanical blood damage is less than with conventional roller pumps. The high shear rate in the rotary pump and the reduced anticoagulation of the patient during prolonged pumping enforces high demands on the biocompati

  20. Pumping a playground swing.

    Science.gov (United States)

    Post, Auke A; de Groot, Gert; Daffertshofer, Andreas; Beek, Peter J

    2007-04-01

    In mechanical studies of pumping a playground swing, two methods of energy insertion have been identified: parametric pumping and driven oscillation. While parametric pumping involves the systematic raising and lowering of the swinger's center of mass (CM) along the swing's radial axis (rope), driven oscillation may be conceived as rotation of the CM around a pivot point at a fixed distance to the point of suspension. We examined the relative contributions of those two methods of energy insertion by inviting 18 participants to pump a swing from standstill and by measuring and analyzing the swing-swinger system (defined by eight markers) in the sagittal plane. Overall, driven oscillation was found to play a major role and parametric pumping a subordinate role, although the relative contribution of driven oscillation decreased as swinging amplitude increased, whereas that of parametric pumping increased slightly. Principal component analysis revealed that the coordination pattern of the swing-swinger system was largely determined (up to 95%) by the swing's motion, while correlation analysis revealed that (within the remaining 5% of variance) trunk and leg rotations were strongly coupled.

  1. Thermally Actuated Hydraulic Pumps

    Science.gov (United States)

    Jones, Jack; Ross, Ronald; Chao, Yi

    2008-01-01

    Thermally actuated hydraulic pumps have been proposed for diverse applications in which direct electrical or mechanical actuation is undesirable and the relative slowness of thermal actuation can be tolerated. The proposed pumps would not contain any sliding (wearing) parts in their compressors and, hence, could have long operational lifetimes. The basic principle of a pump according to the proposal is to utilize the thermal expansion and contraction of a wax or other phase-change material in contact with a hydraulic fluid in a rigid chamber. Heating the chamber and its contents from below to above the melting temperature of the phase-change material would cause the material to expand significantly, thus causing a substantial increase in hydraulic pressure and/or a substantial displacement of hydraulic fluid out of the chamber. Similarly, cooling the chamber and its contents from above to below the melting temperature of the phase-change material would cause the material to contract significantly, thus causing a substantial decrease in hydraulic pressure and/or a substantial displacement of hydraulic fluid into the chamber. The displacement of the hydraulic fluid could be used to drive a piston. The figure illustrates a simple example of a hydraulic jack driven by a thermally actuated hydraulic pump. The pump chamber would be a cylinder containing encapsulated wax pellets and containing radial fins to facilitate transfer of heat to and from the wax. The plastic encapsulation would serve as an oil/wax barrier and the remaining interior space could be filled with hydraulic oil. A filter would retain the encapsulated wax particles in the pump chamber while allowing the hydraulic oil to flow into and out of the chamber. In one important class of potential applications, thermally actuated hydraulic pumps, exploiting vertical ocean temperature gradients for heating and cooling as needed, would be used to vary hydraulic pressures to control buoyancy in undersea research

  2. Energy Storage

    Energy Technology Data Exchange (ETDEWEB)

    Mukundan, Rangachary [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-09-30

    Energy storage technology is critical if the U.S. is to achieve more than 25% penetration of renewable electrical energy, given the intermittency of wind and solar. Energy density is a critical parameter in the economic viability of any energy storage system with liquid fuels being 10 to 100 times better than batteries. However, the economical conversion of electricity to fuel still presents significant technical challenges. This project addressed these challenges by focusing on a specific approach: efficient processes to convert electricity, water and nitrogen to ammonia. Ammonia has many attributes that make it the ideal energy storage compound. The feed stocks are plentiful, ammonia is easily liquefied and routinely stored in large volumes in cheap containers, and it has exceptional energy density for grid scale electrical energy storage. Ammonia can be oxidized efficiently in fuel cells or advanced Carnot cycle engines yielding water and nitrogen as end products. Because of the high energy density and low reactivity of ammonia, the capital cost for grid storage will be lower than any other storage application. This project developed the theoretical foundations of N2 catalysis on specific catalysts and provided for the first time experimental evidence for activation of Mo 2N based catalysts. Theory also revealed that the N atom adsorbed in the bridging position between two metal atoms is the critical step for catalysis. Simple electrochemical ammonia production reactors were designed and built in this project using two novel electrolyte systems. The first one demonstrated the use of ionic liquid electrolytes at room temperature and the second the use of pyrophosphate based electrolytes at intermediate temperatures (200 – 300 ºC). The mechanism of high proton conduction in the pyrophosphate materials was found to be associated with a polyphosphate second phase contrary to literature claims and ammonia production rates as high as 5X 10

  3. Transient Dynamics in Molecular Junctions: Coherent Bichromophoric Molecular Electron Pumps

    CERN Document Server

    Volkovich, Roie

    2010-01-01

    The possibility of using single molecule junctions as electron pumps for energy conversion and storage is considered. It is argued that the small dimensions of these systems enable to make use of unique intra-molecular quantum coherences in order to pump electrons between two leads and to overcome relaxation processes which tend to suppress the pumping efficiency. In particular, we demonstrate that a selective transient excitation of one chromophore in a bi-chromophoric donor-bridge-acceptor molecular junction model yields currents which transfer charge (electron and holes) unevenly to the two leads in the absence of a bias potential. The utility of this mechanism for charge pumping in steady state conditions is proposed.

  4. Electronic Unit Pump Test Bench Development and Pump Properties Research

    Institute of Scientific and Technical Information of China (English)

    LIU Bo-lan; HUANG Ying; ZHANG Fu-jun; ZHAO Chang-lu

    2006-01-01

    A unit pump test bench is developed on an in-line pump test platform. The bench is composed of pump adapting assembly, fuel supply subsystem, lubricating subsystem and a control unit. A crank angle domain injection control method is given out and the control accuracy can be 0.1° crank degree. The bench can test bot h mechanical unit pump and electronic unit pump. A test model-PLD12 electronic unit pump is tested. Full pump delivery map and some influence factors test is d one. Experimental results show that the injection quantity is linear with the de livery angle. The quantity change rate is 15% when fuel temperature increases 30℃. The delivery quantity per cycle increases 30mg at 28V drive voltage. T he average delivery difference for two same type pumps is 5%. Test results show that the bench can be used for unit pump verification.

  5. Practical and efficient magnetic heat pump

    Science.gov (United States)

    Brown, G. V.

    1978-01-01

    Method for pumping heat magnetically at room temperature is more economical than existing refrigeration systems. Method uses natural magneto-thermal effect of gadolinium metal to establish temperature gradient across length of tube. Regenerative cyclic process in which gadolinium sample is magnetized and gives off heat at one end of tube, and then is demagnetized at other end to absorb heat has established temperature gradients of 144 degrees F in experiments near room temperature. Other materials with large magnetothermal effects can be used below room temperature. Possible commercial applications include freeze-drying and food processing, cold storage, and heating and cooling of buildings, plants, and ships.

  6. Practical and efficient magnetic heat pump

    Science.gov (United States)

    Brown, G. V.

    1978-01-01

    Method for pumping heat magnetically at room temperature is more economical than existing refrigeration systems. Method uses natural magneto-thermal effect of gadolinium metal to establish temperature gradient across length of tube. Regenerative cyclic process in which gadolinium sample is magnetized and gives off heat at one end of tube, and then is demagnetized at other end to absorb heat has established temperature gradients of 144 degrees F in experiments near room temperature. Other materials with large magnetothermal effects can be used below room temperature. Possible commercial applications include freeze-drying and food processing, cold storage, and heating and cooling of buildings, plants, and ships.

  7. An atoll for the offshore storage of the electricity; Un atoll pour stocker l'electricite en pleine mer

    Energy Technology Data Exchange (ETDEWEB)

    Maincent, G

    2009-03-15

    This project proposes to use for sea the technique of pumped Storage Hydroelectric, implemented in mountain areas. The method stores energy in form of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost off-peak electric power is used to run the pumps. During periods of high electrical demand, the stored water is released through turbines. This new concept in pumped storage is to use wind turbines to drive water pumps directly, providing a more efficient process and usefully smooth out the variabilities of energy captured from the wind. (A.L.B.)

  8. Study on Thermal Energy Storage Modes and Defrosting Dynamic Characteristics of a PCM Based Air Source Heat Pump%空气源热泵相变蓄能除霜系统蓄热模式及除霜特性的研究

    Institute of Scientific and Technical Information of China (English)

    胡文举; 陈镇凯; 姜益强; 姚杨; 倪龙; 孙成

    2011-01-01

    In this paper,a novel phase change material ( PCM) based reversed-cycle defrosting method for air source heat pump (ASHP) was introduced and its PCM based heat exchanger (PCMHE) was designed. Three thermal energy storage modes were presented and experiments were carried out to test the efficiencies of thermal energy storage and defrosting respectively. By analyzing the experiment results, it was concluded that energy could be quickly stored in PCMHE with series thermal energy storage mode. Nevertheless,with sole and parallel modes,discharge and suction temperatures of the compressor were unusually high,while discharge and suction pressures and input power were relatively lower,also the thermal energy storage speed was very small,which meant that the ASHP could not work effectively. Furthermore,by comparing the PCM based reversed-cycle defrosting method with the traditional one,it was indicated that the former could decrease the defrosting time by 4 minutes at least,also shutting down of the ASHP unit due to low suction pressure protection could be avoided effectively by increasing the compressor's suction pressure of 0. 3 Mpa. Besides, when the system returned to the heating supply mode from the defrosting mode,with the PCM based defrosting method,the air temperature out of the indoor coil increased faster and was higher than the traditional method,which would benefit the indoor thermal comfort greatly.%本文阐述了基于相变蓄热的空气源热泵蓄能除霜系统及其相变蓄热器的设计,提出了3种蓄热模式并搭建了空气源热泵蓄能除霜试验台.通过对实验数据进行分析,认为串联蓄热模式时,系统可有效完成蓄热且相变蓄热器的蓄热速度较快;单独蓄热模式和并联蓄热模式时系统不能有效运行,压缩机的吸、排气温度偏高,而吸、排气压力偏低,功率偏低,相变材料蓄热速度非常小;除霜时,相变蓄能除霜系统的压缩机吸气压力比

  9. Heat driven pulse pump

    Science.gov (United States)

    Benner, Steve M (Inventor); Martins, Mario S. (Inventor)

    2000-01-01

    A heat driven pulse pump includes a chamber having an inlet port, an outlet port, two check valves, a wick, and a heater. The chamber may include a plurality of grooves inside wall of the chamber. When heated within the chamber, a liquid to be pumped vaporizes and creates pressure head that expels the liquid through the outlet port. As liquid separating means, the wick, disposed within the chamber, is to allow, when saturated with the liquid, the passage of only liquid being forced by the pressure head in the chamber, preventing the vapor from exiting from the chamber through the outlet port. A plurality of grooves along the inside surface wall of the chamber can sustain the liquid, which is amount enough to produce vapor for the pressure head in the chamber. With only two simple moving parts, two check valves, the heat driven pulse pump can effectively function over the long lifetimes without maintenance or replacement. For continuous flow of the liquid to be pumped a plurality of pumps may be connected in parallel.

  10. Prediction of rotating stall and cavitation inception in pump turbines

    Energy Technology Data Exchange (ETDEWEB)

    Anciger, D; Jung, A; Aschenbrenner, T, E-mail: Danijel.Anciger@voith.co [Voith Hydro Holding GmbH and Co. KG Alexanderstr. 11, 89522 Heidenheim (Germany)

    2010-08-15

    The current development of modern pump storage plants aims towards a higher flexibility in operation, an extended operation range of the hydraulic machine, especially in the pumping mode, and a higher reliability. A major design target for state-of-the-art reversible Francis-type pump turbines is to find an optimal balance between pumping and generating performance. The pumping requirements are the crucial design drivers, since, even if the turbine mode performance is world class, the success of a project depends on the pump turbine delivering the required maximum pump head and starting reliably in pump mode. The proposed paper describes how advanced computational fluid dynamic (CFD) simulations can help the designer to evaluate his design with respect to hydraulic performance and dynamic phenomena occurring in pump turbines. A standard procedure today is to compute the flow by applying the Reynolds-averaged Navier-Stokes equations (RANS) on the steady-state flow in individual components or in multiple components which are coupled by mixing-plane interfaces (sometimes also called stage-interface). This standard approach gives fast turnaround times and is a good engineering tool. However, accuracy is limited due to necessary simplifications. Therefore methods are developed and evaluated which allow a more reliable prediction of the onset of rotating stall which is the operation limit of the pump under high heads and low flow rates. The behaviour a modern pump turbine design in this instability region is investigated in detail. Another important task in the design process is the proper prediction of cavitation phenomena in the runner. Predicting cavitating flows with multi-phase CFD computations is still a very challenging task. Some results of ongoing work in this field are presented and compared to single phase computations and results from model tests. The relevance and applicability of such computations is discussed. All the information gained from these kinds of

  11. Hydrogen storage

    NARCIS (Netherlands)

    Peters, C.J.; Sloan, E.D.

    2005-01-01

    The invention relates to the storage of hydrogen. The invention relates especially to storing hydrogen in a clathrate hydrate. The clathrate hydrate according to the present invention originates from a composition, which comprises water and hydrogen, as well as a promotor compound. The promotor comp

  12. Energy Storage Systems as a Compliment to Wind Power

    Science.gov (United States)

    Sieling, Jared D.; Niederriter, C. F.; Berg, D. A.

    2006-12-01

    As Gustavus Adolphus College prepares to install two wind turbines on campus, we are faced with the question of what to do with the excess electricity that is generated. Since the College pays a substantial demand charge, it would seem fiscally responsible to store the energy and use it for peak shaving, instead of selling it to the power company at their avoided cost. We analyzed six currently available systems: hydrogen energy storage, flywheels, pumped hydroelectric storage, battery storage, compressed air storage, and superconducting magnetic energy storage, for energy and financial suitability. Potential wind turbine production is compared to consumption to determine the energy deficit or excess, which is fed into a model for each of the storage systems. We will discuss the advantages and disadvantages of each of the storage systems and their suitability for energy storage and peak shaving in this situation.

  13. Modular pump-turbine concept supporting the integration of renewable energy sources in a decentralised grid; Modulare Pumpturbine als Unterstuetzung bei der Einbindung alternativer Energien ins dezentrale Stromnetz

    Energy Technology Data Exchange (ETDEWEB)

    Doujak, Eduard; Unterberger, Philipp; Bauer, Christian [Technische Univ. Wien (Austria). Inst. fuer Energietechnik und Thermodynamik

    2012-11-01

    The integration of renewable energy systems in Europe leads to several challenges in the energy market. Energy storage for stable grid operation has become a necessity. Pumped storage is the only technology available today that is able to store large amounts of energy efficiently and with low specific storage costs. The Vienna University of Technology is currently investigating how existing artificial lakes for snow production could be integrated in pumped storage production systems. A new modular pump turbine concept and its application prospects are presented. (orig.)

  14. Application of wind energy to Great Plains irrigation pumping. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Hagen, L.J.; Lyles, L.; Skidmore, E.L.

    1979-10-01

    Wind energy systems without energy storage for irrigation in the Great Plains are studied. Major uses of irrigation energy were identified as pumping for surface distribution systems, which could be supplied by variable flow, and pumping for sprinkler systems using constant flow. A computer program was developed to simulate operation of wind-powered irrigation wells. Pumping by wind turbine systems was simulated for 2 variable and 2 constant flow operational modes in which auxiliary motors were used in 3 of the modes. Using the simulation program, the well yields and maximum pumping rates among the 4 modes as a function of drawdown in a typical well are compared.

  15. 用于抽水蓄能电站大坝不稳定温度场仿真的水平分区异步长解法%A Method Using Different Time Steps in Different Horizontal Regions for Simulation of Unsteady Temperature Field of Pumped Storage Power Station Dam

    Institute of Scientific and Technical Information of China (English)

    孙伟; 何蕴龙; 王南; 熊堃

    2015-01-01

    Because of the cyclical fluctuation of the water level of the reservoir,the upstream boundary of the pumped storage power station(PSPS)dam would encounter alternate contact with water,gas and other different me-dia. The upstream dam boundary with this kind of characteristics is called the special boundary. These alternating boundary conditions have a big impact on the distribution of the temperature fieldof special boundary surface and its impact range,and cannot be ignored in the temperature simulation analysis. This paper proposes a method of solving unsteady temperature field of pumped storage power station dam with different time steps in different horizontal re-gions,and analyzes in detail the characteristics of special boundary and gives the formula derivation of the basic principle of the method with different time steps in different horizontal regions. The concept of equivalent heat transfer coefficient is also put forward to averagely and approximately consider thevariation of heat transfer coefficient when the surface concrete contacting with different media and the position of horizontal partitioning boundary is given as well. The method is used in the simulation analysis of unsteady temperature field of Hohhot PSPS reservoir dam. The results show that the proposed method is effective and provides the possibility of calculating the temperature stress field which is more complex and time-consuming. Finally,the paper tentatively discusses the problem of freezing and thawing at the special boundary in cold regions.%对于抽水蓄能电站(PSPS)的拦河大坝上游迎水面,由于水库水位周期性升降变化,会出现与水、气等不同介质接触的交替变化现象. 将具有这种现象的迎水坝面边界称之为特殊边界. 这种交替变化的边界条件对特殊边界表面及其影响范围内的温度场分布将产生较大的影响,在温度仿真分析中不能忽略. 提出了考虑特殊边界影响的抽水蓄能电站大坝

  16. Pulsed differential pumping system

    Energy Technology Data Exchange (ETDEWEB)

    Antipov, G.N.; Bagautdinov, F.A.; Rybalov, S.V.

    1985-06-01

    A pulsed differential pumping system is described for extracting an electron beam from a shaping region at a pressure of 10/sup -5/ torr into a volume with a pressure of 10-100 torr. A fast valve is used with appropriate geometrical parameters to reduce the length of the outlet channel considerable while increasing its diameter. Test results are given. The pumping system has two sections which communicate one with the other and with the volume at the elevated pressure which is produced by gasdynamic nozzles.

  17. Heat pump planning handbook

    CERN Document Server

    Bonin, Jürgen

    2015-01-01

    The Heat Pump Planning Handbook contains practical information and guidance on the design, planning and selection of heat pump systems, allowing engineers, designers, architects and construction specialists to compare a number of different systems and options. Including detailed descriptions of components and their functions and reflecting the current state of technology this guide contains sample tasks and solutions as well as new model calculations and planning evaluations. Also economic factors and alternative energy sources are covered, which are essential at a time of rising heat costs. T

  18. Sorption product heat pump

    Energy Technology Data Exchange (ETDEWEB)

    Antonini, G.; Francois, O.; Gendarme, J.P.; Guilleminot, J.J.; Meunier, F.

    1988-07-15

    A continuous operating, and thus with enhanced performance, heat pump is presented. In this heat pump, the heat transfer between the hot source and the output system or network is realized through a solid adsorbent-refrigerant couple having endothermal desorption properties and exothermal adsorption or absorption properties. The sorption products are carried in a closed cycle movement between the two parts of the reactor. Each side of the reactor is assuming always the same function and the thermal inertia have to be overcome only when starting the reactor.

  19. Regenerative adsorbent heat pump

    Science.gov (United States)

    Jones, Jack A. (Inventor)

    1991-01-01

    A regenerative adsorbent heat pump process and system is provided which can regenerate a high percentage of the sensible heat of the system and at least a portion of the heat of adsorption. A series of at least four compressors containing an adsorbent is provided. A large amount of heat is transferred from compressor to compressor so that heat is regenerated. The process and system are useful for air conditioning rooms, providing room heat in the winter or for hot water heating throughout the year, and, in general, for pumping heat from a lower temperature to a higher temperature.

  20. Geothermal Heat Pump Performance

    Energy Technology Data Exchange (ETDEWEB)

    Boyd, Tonya L.; Lienau, Paul J.

    1995-01-01

    Geothermal heat pump systems are a promising new energy technology that has shown rapid increase in usage over the past ten years in the United States. These systems offer substantial benefits to customers and utilities in energy (kWh) and demand (kW) savings. The purpose of this study was to determine what existing monitored data was available mainly from electric utilities on heat pump performance, energy savings and demand reduction for residential, school, and commercial building applications. Information was developed on the status of electric utility marketing programs, barriers to market penetration, incentive programs, and benefits.

  1. Geothermal heat pump performance

    Energy Technology Data Exchange (ETDEWEB)

    Boyd, Tonya L.; Lienau, Paul J.

    1995-01-01

    Geothermal heat pump systems are a promising new energy technology that has shown rapid increase in usage over the past ten years in the United States. These systems offer substantial benefits to customers and utilities in energy (kWh) and demand (kW) savings. The purpose of this study was to determine what existing monitored data was available mainly from electric utilities on heat pump performance, energy savings and demand reduction for residential, school, and commercial building applications. Information was developed on the status of electric utility marketing programs, barriers to market penetration, incentive programs, and benefits.

  2. Molecular heat pump.

    Science.gov (United States)

    Segal, Dvira; Nitzan, Abraham

    2006-02-01

    We propose a molecular device that pumps heat against a thermal gradient. The system consists of a molecular element connecting two thermal reservoirs that are characterized by different spectral properties. The pumping action is achieved by applying an external force that periodically modulates molecular levels. This modulation affects periodic oscillations of the internal temperature of the molecule and the strength of its coupling to each reservoir resulting in a net heat flow in the desired direction. The heat flow is examined in the slow and fast modulation limits and for different modulation wave forms, thus making it possible to optimize the device performance.

  3. Feedstock storage, handling and processing

    Energy Technology Data Exchange (ETDEWEB)

    Egg, R.P.; Coble, C.G.; Engler, C.R. (Texas A and M Univ., College Station, TX (United States). Dept. of Agricultural Engineering); Lewis, D.H. (Texas A and M Univ., College Station, TX (United States). Dept. of Veterinary Microbiology and Parasitology)

    1993-01-01

    This paper is a review of the technology and research covering components of a methane from biomass system between the field and the digester. It deals primarily with sorghum as a feedstock and focuses on research conducted by the Texas Agricultural Experiment Station. Subjects included in this paper are harvesting, hay storage, ansiling, materials handling, pumping and hydraulic characteristics, hydraulic conductivity, pressure/density relationship, and biological pretreatment. This paper is not a comprehensive design manual; however, design equations and coefficients for sorghum are presented, where available, along with references describing the development and application of design models. (author)

  4. Underground Storage Tanks - Storage Tank Locations

    Data.gov (United States)

    NSGIC Education | GIS Inventory — A Storage Tank Location is a DEP primary facility type, and its sole sub-facility is the storage tank itself. Storage tanks are aboveground or underground, and are...

  5. Oil Storage Facilities - Storage Tank Locations

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — A Storage Tank Location is a DEP primary facility type, and its sole sub-facility is the storage tank itself. Storage tanks are aboveground or underground, and are...

  6. Cold water aquifer storage. [air conditioning

    Science.gov (United States)

    Reddell, D. L.; Davison, R. R.; Harris, W. B.

    1980-01-01

    A working prototype system is described in which water is pumped from an aquifer at 70 F in the winter time, chilled to a temperature of less than 50 F, injected into a ground-water aquifer, stored for a period of several months, pumped back to the surface in the summer time. A total of 8.1 million gallons of chilled water at an average temperature of 48 F were injected. This was followed by a storage period of 100 days. The recovery cycle was completed a year later with a total of 8.1 million gallons recovered. Approximately 20 percent of the chill energy was recovered.

  7. Pressurized Vessel Slurry Pumping

    Energy Technology Data Exchange (ETDEWEB)

    Pound, C.R.

    2001-09-17

    This report summarizes testing of an alternate ''pressurized vessel slurry pumping'' apparatus. The principle is similar to rural domestic water systems and ''acid eggs'' used in chemical laboratories in that material is extruded by displacement with compressed air.

  8. Microfluidic "blinking" bubble pump

    NARCIS (Netherlands)

    Yin, Zhizhong; Prosperetti, Andrea

    2005-01-01

    The paper reports data obtained on a simple micropump, suitable for electrolytes, based on the periodic growth and collapse of a single vapor bubble in a microchannel. With a channel diameter of the order of 100 µm, pumping rates of several tens of µl/min and pressure differences of several kPa are

  9. Cold Climate Heat Pump

    Science.gov (United States)

    2013-08-01

    12. Data set 7 – energy consumption of heat pump and furnace ................................ 22 Figure 13. Experimentally adjusted TRNSYS model...minute SCF standard cubic feet SEER seasonal energy efficiency ratio SH superheated TMY Typical Meteorological Year TRNSYS Transient Systems...Simulation Program ( TRNSYS ), to generate an experimentally adjusted, simulation heating seasonal performance. 6.4.1 Simulation Results The TRNSYS model

  10. The Osmotic Pump

    Science.gov (United States)

    Levenspiel, Octave; de Nevers, Noel

    1974-01-01

    Describes the principle involved in an osmotic pump used to extract fresh water from the oceans and in an osmotic power plant used to generate electricity. Although shown to be thermodynamically feasible, the osmotic principle is not likely to be used commerically for these purposes in the near future. (JR)

  11. Optimization of compound gear pump

    Institute of Scientific and Technical Information of China (English)

    栾振辉

    2002-01-01

    This paper introduces the performances of compound gear pump. Based on the target of having the smallest mass per unit volume, the paper established a mathematical model of optimization, and obtained the results of optimization of the pump.

  12. RSES heat pump technician certification

    Energy Technology Data Exchange (ETDEWEB)

    Zeiner, J.

    1996-06-01

    In 1987 the National Heat Pump certification test was developed by the Refrigeration Service Engineers Society (RSES), and in 1994, the program was more specifically named Heat Pump Service Technician Certification. This report describes the benefits of certification.

  13. Orbital Liquid Oxygen Pump Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This proposed work will develop a pump, which is based on two novel and unique design features. The first feature is a lobed pumping mechanism which operates with...

  14. On-line PWR RHR pump performance testing following motor and impeller replacement

    Energy Technology Data Exchange (ETDEWEB)

    DiMarzo, J.T.

    1996-12-01

    On-line maintenance and replacement of safety-related pumps requires the performance of an inservice test to determine and confirm the operational readiness of the pumps. In 1995, major maintenance was performed on two Pressurized Water Reactor (PWR) Residual Heat Removal (RHR) Pumps. A refurbished spare motor was overhauled with a new mechanical seal, new motor bearings and equipped with pump`s `B` impeller. The spare was installed into the `B` train. The motor had never been run in the system before. A pump performance test was developed to verify it`s operational readiness and determine the in-situ pump performance curve. Since the unit was operating, emphasis was placed on conducting a highly accurate pump performance test that would ensure that it satisfied the NSSS vendors accident analysis minimum acceptance curve. The design of the RHR System allowed testing of one train while the other was aligned for normal operation. A test flow path was established from the Refueling Water Storage Tank (RWST) through the pump (under test) and back to the RWST. This allowed staff to conduct a full flow range pump performance test. Each train was analyzed and an expression developed that included an error vector term for the TDH (ft), pressure (psig), and flow rate (gpm) using the variance error vector methodology. This method allowed the engineers to select a test instrumentation system that would yield accurate readings and minimal measurement errors, for data taken in the measurement of TDH (P,Q) versus Pump Flow Rate (Q). Test results for the `B` Train showed performance well in excess of the minimum required. The motor that was originally in the `B` train was similarly overhauled and equipped with `A` pump`s original impeller, re-installed in the `A` train, and tested. Analysis of the `A` train results indicate that the RHR pump`s performance was also well in excess of the vendors requirements.

  15. Influence of guide vane setting in pump mode on performance characteristics of a pump-turbine

    Science.gov (United States)

    Li, Deyou; Wang, Hongjie; Nielsen, Torbjørn K.; Gong, Ruzhi; Wei, Xianzhu; Qin, Daqing

    2016-11-01

    Performance characteristics in pump mode of pump-turbines are vital for the safe and effective operation of pumped storage power plants. They are resultant of Euler head (power input) and hydraulic losses (power dissipation). In this paper, 3-D steady simulations were performed under 13mm, 19mm and 25mm guide vane openings (GVOs). Three groups of operating points under the three GVOs were chosen based on experimental validation to investigate the influence of guide vane setting on flow patterns upstream and downstream. Analysed results show that, the guide vane setting will obviously change the flow pattern downstream, which in turn influences the flow upstream. It shows a strong effect on hydraulic losses in guide and stay vanes. In addition, at the large part load conditions, the change of GVO will increase the relative flow angle at the runner outlet. As a consequence, it decreases the Euler head. However, at other operating conditions, it only has a little influence on Euler head. Flow patterns in pump mode are very dependent on the GVO and discharge.

  16. VIRTUAL FUEL-PUMP DESIGN

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Some concepts of virtual product are discussed. The key technologies of virtual fuel-pump development are in detail analysed, which include virtual fuel-pump product modeling, intelligent simulation, distributed design environment, and virtual assembly. The virtual fuel-pump development prototype system considers requirement analysis, concept design, injection preferment analysis, detailed design, and assembly analysis.

  17. Small Scroll Pump for Cryogenic Liquids Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The innovation is a compact, reliable, light weight, electrically driven pump capable of pumping cryogenic liquids, based on scroll pump technology. This pump will...

  18. Improving pumping system efficiency at coal plants

    Energy Technology Data Exchange (ETDEWEB)

    Livoti, W.C.; McCandless, S.; Poltorak, R. [Baldor Electric Co. (United States)

    2009-03-15

    The industry must employ ultramodern technologies when building or upgrading power plant pumping systems thereby using fuels more efficiently. The article discusses the uses and efficiencies of positive displacement pumps, centrifugal pumps and multiple screw pumps. 1 ref., 4 figs.

  19. Applied research on energy storage and conversion for photovoltaic and wind energy systems. Volume I. Study summary and concept screening. Final report

    Energy Technology Data Exchange (ETDEWEB)

    1978-01-01

    This study was directed at a review of storage technologies, and particularly those which might be best suited for use in conjunction with wind and photovoltaics. The potential ''worth'' added by incorporating storage was extensively analyzed for both wind and photovoltaics. Energy storage concepts studied include (1) above ground pumped hydro storage, (2) underground pumped hydro storage, (3) thermal storage-oil, (4) thermal storage-steam, (5) underground compressed air storage, (6) pneumatic storage, (7) lead-acid batteries, (8) advanced batteries, (9) inertial storage (flywheel), (10) hydrogen generation and storage, and (11) superconducting magnetic energy storage. The investigations performed and the major results, conclusions, and recommendations are presented in this volume. (WHK)

  20. Pumping characteristics of roots blower pumps for light element gases

    Energy Technology Data Exchange (ETDEWEB)

    Hiroki, Seiji; Abe, Tetsuya; Tanzawa, Sadamitsu; Nakamura, Jun-ichi; Ohbayashi, Tetsuro [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment

    2002-07-01

    The pumping speed and compression ratio of the two-stage roots blower pumping system were measured for light element gases (H{sub 2}, D{sub 2} and He) and for N{sub 2}, in order to assess validity of the ITER torus roughing system as an ITER R and D task (T234). The pumping system of an Edwards EH1200 (nominal pumping speed of 1200 m{sup 3}/s), two EH250s (ibid. 250 m{sup 3}/s) and a backing pump (ibid. 100 m{sup 3}/s) in series connection was tested under PNEUROP standards. The maximum pumping speeds of the two-stage system for D{sub 2} and N{sub 2} were 1200 and 1300 m{sup 3}/h, respectively at 60 Hz, which satisfied the nominal pumping speed. These experimental data support the design validity of the ITER torus roughing system. (author)

  1. Induction Motors Most Efficient Operation Points in Pumped Storage Systems

    DEFF Research Database (Denmark)

    Busca-Forcos, Andreea; Marinescu, Corneliu; Busca, Cristian

    2015-01-01

    efficiency is desired especially when operating with renewable energy systems, which present low energy conversion factor (up to 50% - performance coefficient for wind turbines, and efficiency up to 40% for photovoltaic systems). In this paper the most efficient operation points of the induction motors...

  2. Using Heat Pump Energy Storages in the Power Grid

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Andersen, Palle; Nielsen, Kirsten M.

    2011-01-01

    consumption without compromising the comfort of house residents. In the paper an optimization exploiting forecasts of weather and energy prices combined with prediction models of house dynamics is presented. The results show that with the presented method it will be possible to move a substantial amount......The extensive growth of installed wind energy plants lead to increasing balancing problems in the power grid due to the nature of wind fields and diurnal variations in consumption. One way to overcome these problems is to move consumption to times where wind power otherwise cause overproduction...

  3. Valuing hydrological forecasts for a pumped storage assisted hydro facility

    Science.gov (United States)

    Zhao, Guangzhi; Davison, Matt

    2009-07-01

    SummaryThis paper estimates the value of a perfectly accurate short-term hydrological forecast to the operator of a hydro electricity generating facility which can sell its power at time varying but predictable prices. The expected value of a less accurate forecast will be smaller. We assume a simple random model for water inflows and that the costs of operating the facility, including water charges, will be the same whether or not its operator has inflow forecasts. Thus, the improvement in value from better hydrological prediction results from the increased ability of the forecast using facility to sell its power at high prices. The value of the forecast is therefore the difference between the sales of a facility operated over some time horizon with a perfect forecast, and the sales of a similar facility operated over the same time horizon with similar water inflows which, though governed by the same random model, cannot be forecast. This paper shows that the value of the forecast is an increasing function of the inflow process variance and quantifies how much the value of this perfect forecast increases with the variance of the water inflow process. Because the lifetime of hydroelectric facilities is long, the small increase observed here can lead to an increase in the profitability of hydropower investments.

  4. Using Heat Pump Energy Storages in the Power Grid

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Andersen, Palle; Nielsen, Kirsten M.

    2011-01-01

    The extensive growth of installed wind energy plants lead to increasing balancing problems in the power grid due to the nature of wind fields and diurnal variations in consumption. One way to overcome these problems is to move consumption to times where wind power otherwise cause overproduction...

  5. The Microbial Carbon Pump: A new Concept in Marine Biogeochemistry

    Science.gov (United States)

    Weinbauer, Markus; Jiao, Nianzhi

    2013-04-01

    Traditionally, three mechanisms, called pumps, have been suggested to explain the vertical distribution of carbon in the water column: The solubility pump, the carbonate pump and biological carbon pump (BCP). Recently, the conceptual framework of the microbial carbon pump (MCP) has been developed by the SCOR (Scientific Committee on Oceanic Research) WG 134. The MCP is defined as the transfer of labile organic matter into recalcitrant organic matter by microbial activity (microbial loop and viral shunt) causing long-term storage of carbon. The major pathways of the MCP are: 1) Direct exudation of microbial cells during production and proliferation, 2) viral lysis of microbial cells releasing microbial cell wall and cell surface macromolecules and 3) organic aggregate (particle) degradation and transformation.The MCP is important for understanding the marine carbon cycle, since the carbon content in marine dissolved organic matter (DOM, DOC) is similar to the carbon content of CO2 in the atmosphere. First estimates indiacte that the capacity of carbon sequestration into deep marine waters and sediments of the BCP and MCP is in the same order of magnitude (0.4 and 0.5-0.6 Gt C per yr). The fourth carbon pump is likely an important mechanism in the marine carbon cycle and potentially vulnerable to global change.

  6. SHINE Vacuum Pump Test Verification

    Energy Technology Data Exchange (ETDEWEB)

    Morgan, Gregg A; Peters, Brent

    2013-09-30

    Normetex pumps used world-wide for tritium service are no longer available. DOE and other researchers worldwide have spent significant funds characterizing this pump. Identification of alternate pumps is required for performance and compatibility with tritium gas. Many of the pumps that could be used to meet the functional performance requirements (e.g. pressure and flow conditions) of the Normetex pump have features that include the use of polymers or oils and greases that are not directly compatible with tritium service. This study assembles a test system to determine the flow characteristics for candidate alternate pumps. These tests are critical to the movement of tritium through the SHINE Tritium Purification System (TPS). The purpose of the pump testing is two-fold: (1) obtain baseline vacuum pump characteristics for an alternate (i.e. ''Normetex replacement'') pump intended for use in tritium service; and (2) verify that low pressure hydrogen gas can be transported over distances up to 300 feet by the candidate pumps. Flow rates and nominal system pressures have been identified for the SHINE Mo-99 production process Tritium Purification System (TPS). To minimize the line sizes for the transfer of low pressure tritium from the Neutron Driver Accelerator System (NDAS) to the primary processing systems in the TPS, a ''booster'' pump has been located near the accelerator in the design. A series of pump tests were performed at various configurations using hydrogen gas (no tritium) to ensure that this concept is practical and maintains adequate flow rates and required pressures. This report summarizes the results of the tests that have been performed using various pump configurations. The current design of the Tritium Purification System requires the ''booster'' pump to discharge to or to be backed by another vacuum pump. Since Normetex pumps are no longer manufactured, a commercially available Edwards

  7. 14 CFR 23.991 - Fuel pumps.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Fuel pumps. 23.991 Section 23.991... § 23.991 Fuel pumps. (a) Main pumps. For main pumps, the following apply: (1) For reciprocating engine installations having fuel pumps to supply fuel to the engine, at least one pump for each engine must be...

  8. Amplified light storage with high fidelity based on electromagnetically induced transparency in rubidium atomic vapor

    Science.gov (United States)

    Zhou, Wei; Wang, Gang; Tang, Guoyu; Xue, Yan

    2016-06-01

    By using slow and stored light based on electromagnetically induced transparency (EIT), we theoretically realize the storage of optical pulses with enhanced efficiency and high fidelity in ensembles of warm atoms in 85Rb vapor cells. The enhancement of storage efficiency is achieved by introducing a pump field beyond three-level configuration to form a N-type scheme, which simultaneously inhibits the undesirable four-wave mixing effect while preserves its fidelity. It is shown that the typical storage efficiency can be improved from 29% to 53% with the application of pump field. Furthermore, we demonstrate that this efficiency decreases with storage time and increases over unity with optical depth.

  9. Isobar gas and steam. Compressed air storage plant with heat storage; Isobares GuD. Druckluftspeicherkraftwrk mit Waermespeicher

    Energy Technology Data Exchange (ETDEWEB)

    Schlitzberger, Christian; Leithner, Reinhard; Nielsen, Lasse [Technische Univ. Braunschweig (Germany). Inst. fuer Waerme- und Brennstofftechnik

    2008-07-01

    Due to the worldwide increasing energy consumption the unfavourable aspects of the today's power supply structure are strengthened continuously. There are two compressed air energy storage power stations existing. However, these power stations exhibit worse efficiencies of storage in comparison to existing pumped-storage power plants. In order to avoid this disadvantage, a concept of a isobaric gas and steam compressed air storage plant was developed at the institute for heat and fuel technology at the technical university of Braunschweig. This concept is presented in the contribution under consideration.

  10. Performance of a solar augmented heat pump

    Science.gov (United States)

    Bedinger, A. F. G.; Tomlinson, J. J.; Reid, R. L.; Chaffin, D. J.

    Performance of a residential size solar augmented heat pump is reported for the 1979-1980 heating season. The facility located in Knoxville, Tennessee, has a measured heat load coefficient of 339.5 watt/C (644 BTU/hr- F). The solar augmented heat pump system consists of 7.4 cu m of one inch diameter crushed limestone. The heat pump is a nominal 8.8 KW (2 1/2 ton) high efficiency unit. The system includes electric resistance heaters to give the option of adding thermal energy to the pebble bed storage during utility off-peak periods, thus offering considerable load management capability. A 15 KW electric resistance duct heater is used to add thermal energy to the pebble bin as required during off-peak periods. Hourly thermal performance and on site weather data was taken for the period November 1, 1979, to April 13, 1980. Thermal performance data consists of heat flow summations for all modes of the system, pebble bed temperatures, and space temperature. Weather data consists of dry bulb temperature, dew point temperature, total global insolation (in the plane of the collector), and wind speed and direction. An error analysis was performed and the least accurate of the measurements was determined to be the heat flow at 5%. Solar system thermal performance factor was measured to be 8.77. The heat pump thermal performance factor was 1.64. Total system seasonal performance factor was measured to be 1.66. Using a modified version of TRNSYS, the thermal performance of this system was simulated. When simulation results were compared with data collected onsite, the predicted heat flow and power consumption generally were within experimental accuracy.

  11. SIMWEST: A simulation model for wind and photovoltaic energy storage systems (CDC user's manual), volume 1

    Science.gov (United States)

    Warren, A. W.; Esinger, A. W.

    1979-01-01

    Procedures are given for using the SIMWEST program on CDC 6000 series computers. This expanded software package includes wind and/or photovoltaic systems utilizing any combination of five types of storage (pumped hydro, battery, thermal, flywheel, and pneumatic).

  12. Pocket pumped image analysis

    Energy Technology Data Exchange (ETDEWEB)

    Kotov, I.V., E-mail: kotov@bnl.gov [Brookhaven National Laboratory, Upton, NY 11973 (United States); O' Connor, P. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Murray, N. [Centre for Electronic Imaging, Open University, Milton Keynes, MK7 6AA (United Kingdom)

    2015-07-01

    The pocket pumping technique is used to detect small electron trap sites. These traps, if present, degrade CCD charge transfer efficiency. To reveal traps in the active area, a CCD is illuminated with a flat field and, before image is read out, accumulated charges are moved back and forth number of times in parallel direction. As charges are moved over a trap, an electron is removed from the original pocket and re-emitted in the following pocket. As process repeats one pocket gets depleted and the neighboring pocket gets excess of charges. As a result a “dipole” signal appears on the otherwise flat background level. The amplitude of the dipole signal depends on the trap pumping efficiency. This paper is focused on trap identification technique and particularly on new methods developed for this purpose. The sensor with bad segments was deliberately chosen for algorithms development and to demonstrate sensitivity and power of new methods in uncovering sensor defects.

  13. Wavy tube heat pumping

    Energy Technology Data Exchange (ETDEWEB)

    Haldeman, C. W.

    1985-12-03

    A PVC conduit about 4'' in diameter and a little more than 40 feet long is adapted for being seated in a hole in the earth and surrounds a coaxial copper tube along its length that carries Freon between a heat pump and a distributor at the bottom. A number of wavy conducting tubes located between the central conducting tube and the wall of the conduit interconnect the distributor with a Freon distributor at the top arranged for connection to the heat pump. The wavy conducting tubing is made by passing straight soft copper tubing between a pair of like opposed meshing gears each having four convex points in space quadrature separated by four convex recesses with the radius of curvature of each point slightly less than that of each concave recess.

  14. Advanced heat pump cycle

    Energy Technology Data Exchange (ETDEWEB)

    Groll, E.A.; Radermacher, R.

    1993-07-01

    The desorption and absorption process of a vapor compression heat pump with a solution circuit (VCHSC) proceeds at gliding temperature intervals, which can be adjusted over a wide range. In case that the gliding temperature intervals in the desorber and the absorber overlap, a modification of the VCHSC employing a desorber/absorber heat exchange (DAHX) can be introduced, which results in an extreme reduction of the pressure ratio. Although the DAHX-cycle has features of a two-stage cycle, it still requires only one solution pump, one separator and one compressor. Such a cycle for the working pair ammonia/water is built in the Energy Laboratory of the Center for Environmental Energy Engineering at the University of Maryland. The experimental results obtained with the research plant are discussed and compared to those calculated with a simulation program. The possible temperature lift between heat source and heat sink depending on the achievable COP are presented.

  15. Inertial microfluidic pump

    Science.gov (United States)

    Kornilovitch, Pavel; Govyadinov, Alexander; Markel, David; Torniainen, Erik

    2015-11-01

    The inertial pump is powered by a microheater positioned near one end of a fluidic microchannel. As the microheater explosively boils the surrounding fluid, a vapor bubble expands and then collapses asymmetrically, resulting in net flow. Such devices become an effective means of transporting fluids at microscale. They have no moving parts and can be manufactured in large numbers using standard batch fabrication processes. In this presentation, physical principles behind pump operation are described, in particular the role of reservoirs in dissipating mechanical momentum and the expansion-collapse asymmetry. An effective one-dimensional dynamic model is formulated and solved. The model is compared with full three-dimensional CFD simulations and available experimental data. Potential applications of inertial micropumps are described.

  16. Technology assessment heat pumps

    Energy Technology Data Exchange (ETDEWEB)

    Rudolph, R.; Purper, G. (Battelle-Institut e.V., Frankfurt am Main (Germany, F.R.))

    Technology assessment for an increased application of heat pumps is carried out in four areas: Effects in the economics area, i.e. effects on the economic goals which are defined in the Stability Law, on the goals of the power supply policy which result from the energy programme and its projections, and on the economic structure as a whole. The whole range of social problems concerning the use of heat pumps, i.e. the questions which social groups are affected, how they react, and what consequences are they expected to have on energy conservation as an object of social policy. Consequences in the governmental and administrative sectors, i.e. effects on legislation, administration and government budgets. Effects on the ecological systems; of prime interest in this context are the utilisation of environmental energy, changes in the heat balance, and emmission of pollutants.

  17. Hydrodynamics of Pumps

    OpenAIRE

    Brennen, Christopher Earls

    1994-01-01

    The subject of this monograph is the fluid dynamics of liquid turbomachines, particularly pumps. Rather than attempt a general treatise on turbomachines, we shall focus attention on those special problems and design issues associated with the flow of liquid through a rotating machine. There are two characteristics of a liquid that lead to these special problems, and cause a significantly different set of concerns than would occur in, say, a gas turbine. These are the potential for cavitation ...

  18. Pioneering Heat Pump Project

    Energy Technology Data Exchange (ETDEWEB)

    Aschliman, Dave [Indiana Inst. of Technology, Inc., Fort Wayne, IN (United States); Lubbehusen, Mike [Indiana Inst. of Technology, Inc., Fort Wayne, IN (United States)

    2015-06-30

    This project was initiated at a time when ground coupled heat pump systems in this region were limited in size and quantity. There were economic pressures with costs for natural gas and electric utilities that had many organizations considering ground coupled heat pumps; The research has added to the understanding of how ground temperatures fluctuate seasonally and how this affects the performance and operation of the heat pumps. This was done by using a series of temperature sensors buried within the middle of one of the vertical bore fields with sensors located at various depths below grade. Trending of the data showed that there is a lag in ground temperature with respect to air temperatures in the shoulder months, however as full cooling and heating season arrives, the heat rejection and heat extraction from the ground has a significant effect on the ground temps; Additionally it is better understood that while a large community geothermal bore field serving multiple buildings does provide a convenient central plant to use, it introduces complexity of not being able to easily model and predict how each building will contribute to the loads in real time. Additional controllers and programming were added to provide more insight into this real time load profile and allow for intelligent shedding of load via a dry cooler during cool nights in lieu of rejecting to the ground loop. This serves as a means to ‘condition’ the ground loop and mitigate thermal creep of the field, as is typically observed; and It has been observed when compared to traditional heating and cooling equipment, there is still a cost premium to use ground source heat pumps that is driven mostly by the cost for vertical bore holes. Horizontal loop systems are less costly to install, but do not perform as well in this climate zone for heating mode

  19. Positive displacement rotary pump

    Science.gov (United States)

    Moody, Paul E.

    1994-04-01

    An eccentric drive rotates inside a ring that is hinged to a plate and an elastomeric curtain is wrapped around the ring and across an articulated plate. The curtain moves along a cylindrical wall inside the pump cavity to move fluid from an inlet to an outlet end of the chamber. Two or more chambers can be coupled in series or in parallel with one another.

  20. Nonazeotropic Heat Pump

    Science.gov (United States)

    Ealker, David H.; Deming, Glenn

    1991-01-01

    Heat pump collects heat from water circulating in heat-rejection loop, raises temperature of collected heat, and transfers collected heat to water in separate pipe. Includes sealed motor/compressor with cooling coils, evaporator, and condenser, all mounted in outer housing. Gradients of temperature in evaporator and condenser increase heat-transfer efficiency of vapor-compression cycle. Intended to recover relatively-low-temperature waste heat and use it to make hot water.

  1. Nonazeotropic Heat Pump

    Science.gov (United States)

    Ealker, David H.; Deming, Glenn

    1991-01-01

    Heat pump collects heat from water circulating in heat-rejection loop, raises temperature of collected heat, and transfers collected heat to water in separate pipe. Includes sealed motor/compressor with cooling coils, evaporator, and condenser, all mounted in outer housing. Gradients of temperature in evaporator and condenser increase heat-transfer efficiency of vapor-compression cycle. Intended to recover relatively-low-temperature waste heat and use it to make hot water.

  2. Introduction to Pump Rotordynamics

    Science.gov (United States)

    2006-11-01

    RTO-EN-AVT-143 9 - 1 Introduction to Pump Rotordynamics Luis San Andrés Mast-Childs Tribology Professor Turbomachinery Laboratory Texas A... rotordynamics of turbomachinery, excessive vibration and instability. The acceptable performance of a turbomachine depends on the adequate design and operation...on rotordynamics . The basic equations for the modeling of linear rotor-bearing systems are given along with an example for the rotordynamics of a

  3. Electrocentrifugal pumping; Bombeo electrocentrifugo

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Perez, Guillermo; Medellin Otero, Hector [Instituto Mexicano del Peroleo (Mexico)

    1996-07-01

    The exploitation of isolated oil deposits, in losing their own energy, enter a phase of secondary recovery. One of the technologies of new development in Mexico is the one of electrocentrifugal pumping , which consists of introducing the motor-pump as an integral part of the production pipe down to the well bottom and pumping directly up to central complexes, from where it is sent inland. In the present paper is intended to explain what this type of secondary recovery consists of. [Spanish] La explotacion de yacimientos aislados de petroleo, al perder su energia propia, entran en una fase de recuperacion secundaria. Una de las tecnologias de nuevo desarrollo en Mexico es la de bombeo electrocentrifugo, la cual consiste en introducir la motobomba como parte integral de la tuberia de produccion hasta el fondo del pozo y bombearlo directamente hasta los complejos centrales, de donde se envia a tierra. En el presente trabajo se pretende explicar en que consiste este tipo de recuperacion secundaria.

  4. Stirling Engine Heat Pump

    Science.gov (United States)

    Kagawa, Noboru

    Recent advances in the feasibility studies related to the Stirling engines and Stirling engine heat pumps which have been considered attractive due to their promising role in helping to solve the global environmental and energy problems,are reviewed. This article begins to describe the brief history of the Stirling engines and theoretical thermodynamic analysis of the Stirling cycle in order to understand several advantages on the Stirling engine. Furthermore,they could throw light on our question why the dream engines had not been promoted to practical applications during two hundred years. The present review shows that the Stirling engines with several unique advantages including 30 to 40% thermal efficiency and preferable exhaust characteristics,had been designed and constructed by recent tackling for the development of the advanced automobile and other applications using them. Based on the current state of art,it is being provided to push the Stirling engines combined with heat pumps based on the reversed Rankine cycle to the market. At present,however, many problems, especially for the durability, cost, and delicate engine parts must be enforced to solve. In addition,there are some possibilities which can increase the attractiveness of the Stirling engines and heat pumps. The review closes with suggestions for further research.

  5. A Magnetically Coupled Cryogenic Pump

    Science.gov (United States)

    Hatfield, Walter; Jumper, Kevin

    2011-01-01

    Historically, cryogenic pumps used for propellant loading at Kennedy Space Center (KSC) and other NASA Centers have a bellows mechanical seal and oil bath ball bearings, both of which can be problematic and require high maintenance. Because of the extremely low temperatures, the mechanical seals are made of special materials and design, have wearing surfaces, are subject to improper installation, and commonly are a potential leak path. The ball bearings are non-precision bearings [ABEC-1 (Annular Bearing Engineering Council)] and are lubricated using LOX compatible oil. This oil is compatible with the propellant to prevent explosions, but does not have good lubricating properties. Due to the poor lubricity, it has been a goal of the KSC cryogenics community for the last 15 years to develop a magnetically coupled pump, which would eliminate these two potential issues. A number of projects have been attempted, but none of the pumps was a success. An off-the-shelf magnetically coupled pump (typically used with corrosive fluids) was procured that has been used for hypergolic service at KSC. The KSC Cryogenics Test Lab (CTL) operated the pump in cryogenic LN2 as received to determine a baseline for modifications required. The pump bushing, bearings, and thrust rings failed, and the pump would not flow liquid (this is a typical failure mode that was experienced in the previous attempts). Using the knowledge gained over the years designing and building cryogenic pumps, the CTL determined alternative materials that would be suitable for use under the pump design conditions. The CTL procured alternative materials for the bearings (bronze, aluminum bronze, and glass filled PTFE) and machined new bearing bushings, sleeves, and thrust rings. The designed clearances among the bushings, sleeves, thrust rings, case, and case cover were altered once again using experience gained from previous cryogenic pump rebuilds and designs. The alternative material parts were assembled into

  6. Comparison of rechargeable versus battery-operated insulin pumps: temperature fluctuations

    Directory of Open Access Journals (Sweden)

    Vereshchetin P

    2016-10-01

    Full Text Available Paul Vereshchetin, Thomas W McCann Jr, Navdeep Ojha, Ramakrishna Venugopalan, Brian L Levy Johnson & Johnson Diabetes Care Companies, Chesterbrook, PA, USA Abstract: The role of continuous subcutaneous insulin infusion (insulin pumps has become increasingly important in diabetes management, and many different types of these systems are currently available. This exploratory study focused on the reported heating issues that lithium-ion battery-powered pumps may have during charging compared with battery-operated pumps. It was found that pump temperature increased by 6.4°C during a long charging cycle of a lithium-ion battery-operated pump under ambient temperatures. In an environmental-chamber kept at 35°C, the pump temperature increased by 4.4°C, which indicates that the pump temperature was above that of the recommended safety limit for insulin storage of 37°C. When designing new pumps, and when using currently available rechargeable pumps in warmer climates, the implications of these temperature increases should be taken into consideration. Future studies should also further examine insulin quality after charging. Keywords: insulin pumps, diabetes mellitus, safety, heating

  7. Control System for Solar-Assisted Heat Pump System.

    Science.gov (United States)

    heat pump , a water-to-air heat exchanger, a domestic water heater, and a cooling tower. The preferred embodiment of the controller of the present invention includes a first temperature sensing means for sensing the temperature of the collector fluid at the outlet of the solar collector system, a second temperature sensing means for sensing the temperature of the storage fluid at the thermal storage system, and a third temperature sensing means for sensing the temperature of the inlet water to the domestic water heater. The controller compares the temperature of the thermal

  8. Development of an innovative spacecraft thermal storage device

    Science.gov (United States)

    Parrish, Clyde F.; Scaringe, Robert P.; Pratt, David M.

    Several adsorbent-refrigerant pairs have been examined which demonstrate that the innovative heat-pump-adsorption storage device (HPASD) presented can provide significant thermal storage in a vapor-compressor heat pump. The thermal storage capacity of HPASD systems with methanol on calcium chloride as the adsorbent pair was 54.8 kJ/kg with a radiator area of 17 sq m for a 50-kW peak thermal load. Values for a pumped loop were 15 kJ/kg with a 202-sq m radiator area. Heat pumps with methanol as the working fluid have a storage capacity of 24 kJ/kg and a radiator area of 70 sq m. Phase change materials have values in the range of 12.6 kJ/kg (n-octadecane with a 30 deg delta T) to 37 kJ/kg (gallium with a 10 deg delta T). The radiator areas for these phase change systems range from 225 to 43 sq m, respectively. Data collected to date indicate that the HPASD device has superior thermal storage characteristics when compared with other systems under typical use conditions.

  9. Characterization and assessment of novel bulk storage technologies : a study for the DOE Energy Storage Systems program.

    Energy Technology Data Exchange (ETDEWEB)

    Huff, Georgianne; Tong, Nellie (KEMA Consulting, Fairfax, VA); Fioravanti, Richard (KEMA Consulting, Fairfax, VA); Gordon, Paul (Sentech/SRA International, Bethesda, MD); Markel, Larry (Sentech/SRA International, Bethesda, MD); Agrawal, Poonum (Sentech/SRA International, Bethesda, MD); Nourai, Ali (KEMA Consulting, Fairfax, VA)

    2011-04-01

    This paper reports the results of a high-level study to assess the technological readiness and technical and economic feasibility of 17 novel bulk energy storage technologies. The novel technologies assessed were variations of either pumped storage hydropower (PSH) or compressed air energy storage (CAES). The report also identifies major technological gaps and barriers to the commercialization of each technology. Recommendations as to where future R&D efforts for the various technologies are also provided based on each technology's technological readiness and the expected time to commercialization (short, medium, or long term). The U.S. Department of Energy (DOE) commissioned this assessment of novel concepts in large-scale energy storage to aid in future program planning of its Energy Storage Program. The intent of the study is to determine if any new but still unproven bulk energy storage concepts merit government support to investigate their technical and economic feasibility or to speed their commercialization. The study focuses on compressed air energy storage (CAES) and pumped storage hydropower (PSH). It identifies relevant applications for bulk storage, defines the associated technical requirements, characterizes and assesses the feasibility of the proposed new concepts to address these requirements, identifies gaps and barriers, and recommends the type of government support and research and development (R&D) needed to accelerate the commercialization of these technologies.

  10. Use of ice storage equipment in the food industry

    Energy Technology Data Exchange (ETDEWEB)

    Vries, H. de

    1984-01-01

    The manufacture of foods in its widest sense demands a 'balanced supply of cooling'. Whenever 'cold requirement' occurs in different ways during production, the ice storage equipment in particular for 'cooling supplies'. The cooling performance (amount of cold from horizontal tubes and slabs or from horizontal pipes given off to the water flowing past) that can be expected from modern ice storage equipment, is made clear numerically. The way the storage vessel is constructed and its design have particular influence on the energy-saving quality (stirring mechanism with high performance at low pump capacity). Optimisation results for a plate evaporator design combined with a heat exchange system are presented. These include running cost savings of up to 18% in a yoghurt factory, a maltery and an ice cream factory. By means of this heat pump compound, environmental energy can be used in cold storage.

  11. Geotechnical basis for underground energy storage in hard rock

    Science.gov (United States)

    Farquhar, O. C.

    1982-03-01

    Underground pumped hydroelectric storage requires the excavation of caverns in hard rock. Hard rock caverns, also, are one option for compressed air stoage. Preliminary design studies for both technologies at a specific site were completed. The geotechnical aspects of these storage systems are discussed from a generic viewpoint. Information about effective use of hard rock openings, including tunnels and shafts, comes mainly from other types of underground projects. These are power houses for hydroelectric and conventional pumped storage schemes, as well as transportation facilities and mines. Rock strength, support, instrumentation, costs, management, and experimental work are among the items considered. Mapping of geologic structures, rock fragmentation, and rock mass properties is also discussed. The general conclusions are that rock types favorable for underground energy storage are present at suitable depths in many areas and that they can be identified by adequate geotechnical exploration prior to detailed design.

  12. Supercritical waste oxidation pump investigation

    Energy Technology Data Exchange (ETDEWEB)

    Thurston, G.; Garcia, K.

    1993-02-01

    This report investigates the pumping techniques and pumping equipment that would be appropriate for a 5,000 gallon per day supercritical water oxidation waste disposal facility. The pumps must boost water, waste, and additives from atmospheric pressure to approximately 27.6 MPa (4,000 psia). The required flow ranges from 10 gpm to less than 0.1 gpm. For the higher flows, many commercial piston pumps are available. These pumps have packing and check-valves that will require periodic maintenance; probably at 2 to 6 month intervals. Several commercial diaphragm pumps were also discovered that could pump the higher flow rates. Diaphragm pumps have the advantage of not requiring dynamic seals. For the lower flows associated with the waste and additive materials, commercial diaphragm pumps. are available. Difficult to pump materials that are sticky, radioactive, or contain solids, could be injected with an accumulator using an inert gas as the driving mechanism. The information presented in this report serves as a spring board for trade studies and the development of equipment specifications.

  13. Efficient light storage with reduced energy loss via nonlinear compensation in rubidium vapor

    Science.gov (United States)

    Wang, Gang; Zhou, Wei; Chen, Hong-Li; Xue, Yan; Wu, Jin-Hui; Xu, Huai-Liang; Gao, Jin-Yue

    2016-06-01

    We report an experimental demonstration of efficient light storage based on a modified technique of electromagnetically induced transparency in hot rubidium vapor. By introducing an auxiliary pump field to go beyond the Λ -type configuration, we find that the undesired four-wave mixing can be greatly suppressed to result in sufficiently reduced energy loss of a probe pulse. The light storage efficiency can be as high as  ∼80% within the storage time of 100 ns with the pump field applied, which is almost 6 times larger than that in the absence of the pump field. We may also amend the light storage efficiency in a linear way by increasing the optical depth of our atomic vapor even without saturation effect. We obtain, in fact, an amplified probe pulse via Raman gain during light storage and retrieval, which should have practical applications in classical and quantum information processing.

  14. Spatial Information Storage

    Directory of Open Access Journals (Sweden)

    Vladimir Markelov

    2013-01-01

    Full Text Available The article describes the spatial information storage, shows the features of spatial information and of such storage systems formation. Requirements for information storage technologies and for the data management in storage systems are determined. Cartographic information storage and updating features are shown. The article proves that intelligent solutions are the most efficient means of working with large amounts of spatial data.

  15. Direct pumping of four levels lasing materials

    Science.gov (United States)

    Goldring, Sharone; Lavi, Raphael; Tal, Alon; Jackel, Steven M.; Lebiush, Eyal; Tzuk, Yitshak; Azoulay, Ehud

    2003-06-01

    Heat generation and laser performance were studied in Nd:YAG oscillators pumped with a Ti:Sapphire laser in two regimes: band pumping at 802nm and direct pumping at 885nm. Slope efficiencies of 52% and 57%, when pumped at 802nm and 885nm, were obtained, respectively. Heat per unit laser output was found to be 27% lower when pumped at 885nm (direct pumping regime) as compared to traditional band pumping around 808nm.

  16. Comparative evaluation of ground-coupled heat pumps that use solar energy

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, J.W.; Catan, M.A.

    1985-03-01

    A study of combined building space conditioning systems using both solar energy and heat pumps was conducted for the US Department of Energy (DOE). Several of these systems used the ground as a source or storage element for thermal energy, in order to reduce or eliminate the need for backup energy. This paper summarizes the results obtained for these systems in the United States, and describes the relationship of ground-coupling to the overall US solar-assisted heat-pump program.

  17. Analysis of S Characteristics and Pressure Pulsations in a Pump-Turbine With Misaligned Guide Vanes

    OpenAIRE

    SUN, HUI; Xiao, Ruofu; Liu, Weichao; Wang, Fujun

    2013-01-01

    Growing environmental concerns and the need for better power balancing and frequency control have increased attention in renewable energy sources such as the reversible pump-turbine which can provide both power generation and energy storage. Pump-turbine operation along the S-shaped curve can lead to difficulties in loading the rejection process with unusual increases in water pressure, which lead to machine vibrations. Pressure fluctuations are the primary reason for unstable operation of pu...

  18. Proper Sizing of Circulation Pumps

    DEFF Research Database (Denmark)

    Tommerup, Henrik M.; Nørgaard, Jørgen

    2007-01-01

    , but the results can be applied to Europe in general. Despite the small sample of houses involved in the test, 15 houses, some rather safe conclusions can be drawn from the results, which showed that newly developed pumps with power consumption around 5-8 W, can perform the task of circulating the water...... sufficiently to keep the houses satisfactorily warm during the heating season of the test. The old replaced pumps used 5-10 times more power. In Europe alone, a gradual replacement of the present vastly oversized pumps with such small but sufficient pumps can save the construction of 17 large power plants...... as well as their pollution during operation. Policy measures are proposed of how to ensure that in the future only such energy saving pumps are installed. Furthermore, on the basis of the historic experiences with circulation pumps some con¬clusions are drawn on how to investigate, develop and market new...

  19. Research on synchronous gear pump

    Institute of Scientific and Technical Information of China (English)

    LUAN Zhen-hui

    2010-01-01

    Based on a comprehensive analysis of the structure and existing problems of the gear pump, provided a structure principle of a synchronous gear pump. The discussions focused on the working principle, construction features and finite element analysis of the hydraulic gear. The research indicates that the new pump has such advantages as lower noise, better distributed flow and a high work pressure, and it can be widely used in hydraulic systems.

  20. Centrifugal pumps and allied machinery

    CERN Document Server

    Anderson, HH

    1994-01-01

    This book will be of vital interest to all engineers and designers concerned with centrifugal pumps and turbines. Including statistical information derived from 20000 pumps and 700 turbines with capacities of 5gpm to 5000000gpm, this book offers the widest range and scope of information currently available. Statistical analyses suggest practical methods of increasing pump performance and provide valuable data for new design aspects.

  1. Biomarker for Glycogen Storage Diseases

    Science.gov (United States)

    2017-07-03

    Fructose Metabolism, Inborn Errors; Glycogen Storage Disease; Glycogen Storage Disease Type I; Glycogen Storage Disease Type II; Glycogen Storage Disease Type III; Glycogen Storage Disease Type IV; Glycogen Storage Disease Type V; Glycogen Storage Disease Type VI; Glycogen Storage Disease Type VII; Glycogen Storage Disease Type VIII

  2. Energy storage systems: power grid and energy market use cases

    Directory of Open Access Journals (Sweden)

    Komarnicki Przemysław

    2016-09-01

    Full Text Available Current power grid and market development, characterized by large growth of distributed energy sources in recent years, especially in Europa, are according energy storage systems an increasingly larger field of implementation. Existing storage technologies, e.g. pumped-storage power plants, have to be upgraded and extended by new but not yet commercially viable technologies (e.g. batteries or adiabatic compressed air energy storage that meet expected demands. Optimal sizing of storage systems and technically and economically optimal operating strategies are the major challenges to the integration of such systems in the future smart grid. This paper surveys firstly the literature on the latest niche applications. Then, potential new use case and operating scenarios for energy storage systems in smart grids, which have been field tested, are presented and discussed and subsequently assessed technically and economically.

  3. Seasonal thermal energy storage

    Energy Technology Data Exchange (ETDEWEB)

    Allen, R.D.; Kannberg, L.D.; Raymond, J.R.

    1984-05-01

    This report describes the following: (1) the US Department of Energy Seasonal Thermal Energy Storage Program, (2) aquifer thermal energy storage technology, (3) alternative STES technology, (4) foreign studies in seasonal thermal energy storage, and (5) economic assessment.

  4. Operation of the counter-rotating type pump-turbine unit installed in the power stabilizing system

    Science.gov (United States)

    Kanemoto, T.; Honda, H.; Kasahara, R.; Miyaji, T.

    2014-03-01

    This serial research intends to put a unique power stabilization system with a pumped storage into practical use. The pumped storage is equipped with a counter-rotating type pump-turbine unit whose operating mode can be shifted instantaneously in response to the fluctuation of power from renewable resources. This paper verifies that the system is reasonably effective to stabilize the fluctuating power. It is necessary to quickly increase the rotational speed when the operation is shifted from the turbine to the pumping modes, because the unit cannot pump-up water from a lower reservoir at a slow rotational speed while keeping gross/geodetic head constant. The maximum hydraulic efficiency at the turbine mode is close to the efficiency of the counter-rotating type hydroelectric unit designed exclusively for the turbine mode. The system is also provided for a pilot plant to be operated in the field.

  5. Theoretical Prediction of the Pumping Performance of Dry Pumps (Taking the Scroll Pump and the Screw Pump by Way of Example)

    Science.gov (United States)

    Sawada, Tadashi; Ohbayashi, Tetsuro

    Since almost all commercially provided dry pumps are of the positive displacement type, the leak flow through clearance between displacement chambers in the pump is a dominant factor which determines pumping performance. Prediction methods for the pumping performance of dry pumps are explained by comparing it to the scroll pump and the screw pump. The scroll pump has long clearances, but the screw pump has relatively short ones, and the volume of the chambers reduces from the inlet toward the outlet in the scroll pump, but that in the screw pump is kept constant throughout the pumping process. Such a structural difference produces a small difference in the way of treating leak flow. These two methods can be applied to the other dry pumps requiring only minor modification.

  6. Pump, and earth-testable spacecraft capillary heat transport loop using augmentation pump and check valves

    Science.gov (United States)

    Baker, David (Inventor)

    1998-01-01

    A spacecraft includes heat-generating payload equipment, and a heat transport system with a cold plate thermally coupled to the equipment and a capillary-wick evaporator, for evaporating coolant liquid to cool the equipment. The coolant vapor is coupled to a condenser and in a loop back to the evaporator. A heated coolant reservoir is coupled to the loop for pressure control. If the wick is not wetted, heat transfer will not begin or continue. A pair of check valves are coupled in the loop, and the heater is cycled for augmentation pumping of coolant to and from the reservoir. This augmentation pumping, in conjunction with the check valves, wets the wick. The wick liquid storage capacity allows the augmentation pump to provide continuous pulsed liquid flow to assure continuous vapor transport and a continuously operating heat transport system. The check valves are of the ball type to assure maximum reliability. However, any type of check valve can be used, including designs which are preloaded in the closed position. The check valve may use any ball or poppet material which resists corrosion. For optimum performance during testing on Earth, the ball or poppet would have neutral buoyancy or be configured in a closed position when the heat transport system is not operating. The ball may be porous to allow passage of coolant vapor.

  7. Lasers with nuclear pumping

    CERN Document Server

    Melnikov, S P; Sizov, A N; Miley, George H

    2015-01-01

    This book covers the history of lasers with nuclear pumping (Nuclear Pumped Lasers, NPLs). This book showcases the most important results and stages of NPL development in The Russian Federal Nuclear Center (VNIIEF) as well as other Russian and international laboratories, including laboratories in the United States. The basic science and technology behind NPLs along with potential applications are covered throughout the book. As such, this book: ·         Contains a historical overview of the extensive information developed over the past 40 years of work on NPLs ·         Covers the most important results and stages of NPL development, not just in the Russian Federal Nuclear Center, VNIIEF, but also in other laboratories in Russia, the United States , and some other scattered international laboratories ·         Systematizes the fragmented information accumulated over these years of very active research and development As the first comprehensive discussion of NPLs, students, research...

  8. The terrestrial silica pump.

    Directory of Open Access Journals (Sweden)

    Joanna C Carey

    Full Text Available Silicon (Si cycling controls atmospheric CO(2 concentrations and thus, the global climate, through three well-recognized means: chemical weathering of mineral silicates, occlusion of carbon (C to soil phytoliths, and the oceanic biological Si pump. In the latter, oceanic diatoms directly sequester 25.8 Gton C yr(-1, accounting for 43% of the total oceanic net primary production (NPP. However, another important link between C and Si cycling remains largely ignored, specifically the role of Si in terrestrial NPP. Here we show that 55% of terrestrial NPP (33 Gton C yr(-1 is due to active Si-accumulating vegetation, on par with the amount of C sequestered annually via marine diatoms. Our results suggest that similar to oceanic diatoms, the biological Si cycle of land plants also controls atmospheric CO(2 levels. In addition, we provide the first estimates of Si fixed in terrestrial vegetation by major global biome type, highlighting the ecosystems of most dynamic Si fixation. Projected global land use change will convert forests to agricultural lands, increasing the fixation of Si by land plants, and the magnitude of the terrestrial Si pump.

  9. Diode-pumped laser with improved pumping system

    Science.gov (United States)

    Chang, Jim J.

    2004-03-09

    A laser wherein pump radiation from laser diodes is delivered to a pump chamber and into the lasing medium by quasi-three-dimensional compound parabolic concentrator light channels. The light channels have reflective side walls with a curved surface and reflective end walls with a curved surface. A flow tube between the lasing medium and the light channel has a roughened surface.

  10. 33 CFR 157.126 - Pumps.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Pumps. 157.126 Section 157.126... Washing (COW) System on Tank Vessels Design, Equipment, and Installation § 157.126 Pumps. (a) Crude oil must be supplied to the COW machines by COW system pumps or cargo pumps. (b) The pumps under...

  11. Design of Pumps for Water Hydraulic Systems

    DEFF Research Database (Denmark)

    Klit, Peder; Olsen, Stefan; Bech, Thomas Nørgaard

    1999-01-01

    This paper considers the development of two pumps for water hydraulic applications. The pumps are based on two different working principles: The Vane-type pump and the Gear-type pump. Emphasis is put on the considerations that should be made to account for water as the hydraulic fluid.......KEYWORDS: water, pump, design, vane, gear....

  12. About Variable Speed Heating and Cooling Pumps

    OpenAIRE

    Cătălin Popovici; Jan Ignat

    2009-01-01

    The present work has the purpose of underlying the advantages of variable speed heating and cooling pumps use for the perspective of general and particular pumping costs and efficiency. The study approaches comparisons between constant flow pumps and variable flow pumps in different given situations and comparatively analyses the pumping costs.

  13. 46 CFR 119.520 - Bilge pumps.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Bilge pumps. 119.520 Section 119.520 Shipping COAST... Ballast Systems § 119.520 Bilge pumps. (a) Each vessel must be provided with bilge pumps in accordance... have a portable hand bilge pump that must be: (1) Capable of pumping water, but not...

  14. 46 CFR 154.1135 - Pumps.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 5 2010-10-01 2010-10-01 false Pumps. 154.1135 Section 154.1135 Shipping COAST GUARD... Pumps. (a) Water to the water spray system must be supplied by: (1) A pump that is only for the use of the system; (2) A fire pump; or (3) A pump specially approved by the Commandant (CG-522)....

  15. Heat-Powered Pump for Liquid Metals

    Science.gov (United States)

    Campana, R. J.

    1986-01-01

    Proposed thermoelectromagnetic pump for liquid metal powered by waste heat; needs no battery, generator, or other external energy source. Pump turns part of heat in liquid metal into pumping energy. In combination with primary pump or on its own, thermoelectric pump circulates coolant between reactor and radiator. As long as there is decay heat to be removed, unit performs function.

  16. Heat-Powered Pump for Liquid Metals

    Science.gov (United States)

    Campana, R. J.

    1986-01-01

    Proposed thermoelectromagnetic pump for liquid metal powered by waste heat; needs no battery, generator, or other external energy source. Pump turns part of heat in liquid metal into pumping energy. In combination with primary pump or on its own, thermoelectric pump circulates coolant between reactor and radiator. As long as there is decay heat to be removed, unit performs function.

  17. Electric utility applications of hydrogen energy storage systems

    Energy Technology Data Exchange (ETDEWEB)

    Swaminathan, S.; Sen, R.K.

    1997-10-15

    This report examines the capital cost associated with various energy storage systems that have been installed for electric utility application. The storage systems considered in this study are Battery Energy Storage (BES), Superconducting Magnetic Energy Storage (SMES) and Flywheel Energy Storage (FES). The report also projects the cost reductions that may be anticipated as these technologies come down the learning curve. This data will serve as a base-line for comparing the cost-effectiveness of hydrogen energy storage (HES) systems in the electric utility sector. Since pumped hydro or compressed air energy storage (CAES) is not particularly suitable for distributed storage, they are not considered in this report. There are no comparable HES systems in existence in the electric utility sector. However, there are numerous studies that have assessed the current and projected cost of hydrogen energy storage system. This report uses such data to compare the cost of HES systems with that of other storage systems in order to draw some conclusions as to the applications and the cost-effectiveness of hydrogen as a electricity storage alternative.

  18. Pumps in wearable ultrafiltration devices: pumps in wuf devices.

    Science.gov (United States)

    Armignacco, Paolo; Garzotto, Francesco; Bellini, Corrado; Neri, Mauro; Lorenzin, Anna; Sartori, Marco; Ronco, Claudio

    2015-01-01

    The wearable artificial kidney (WAK) is a device that is supposed to operate like a real kidney, which permits prolonged, frequent, and continuous dialysis treatments for patients with end-stage renal disease (ESRD). Its functioning is mainly related to its pumping system, as well as to its dialysate-generating and alarm/shutoff ones. A pump is defined as a device that moves fluids by mechanical action. In such a context, blood pumps pull blood from the access side of the dialysis catheter and return the blood at the same rate of flow. The main aim of this paper is to review the current literature on blood pumps, describing the way they have been functioning thus far and how they are being engineered, giving details about the most important parameters that define their quality, thus allowing the production of a radar comparative graph, and listing ideal pumps' features.

  19. Optimization of a solar cooling system with interior energy storage

    Energy Technology Data Exchange (ETDEWEB)

    Sanjuan, C.; Soutullo, S.; Heras, M.R. [Department of Energy, Energy Efficiency in Buildings Unit, CIEMAT, Madrid E-28040 (Spain)

    2010-07-15

    This paper focuses on the optimization of the performance of a solar absorption cooling system composed by four units with interior energy storage. A full dynamic simulation model that includes the solar collector field, the absorption heat pump system and the building load calculation has been developed. It has been applied to optimize the coupling of a system based on this new technology of solar powered absorption heat pump, to a bioclimatic building recently constructed in the Plataforma Solar de Almeria (PSA) in Spain. The absorption heat pump system considered is composed by four heat pumps that store energy in the form of crystallized salts so that no external storage capacity is required. Each heat pump is composed of two separate barrels that can charge (store energy from the solar field) and discharge (deliver heat or cold to the building) independently. Different configurations of the four units have been analysed taking into account the storage possibilities of the system and its capacity to respond to the building loads. It has been shown how strong the influence of the control strategies in the overall performance is, and the importance of using hourly simulations models when looking for highly efficient buildings. (author)

  20. New laser materials for laser diode pumping

    Science.gov (United States)

    Jenssen, H. P.

    1990-01-01

    The potential advantages of laser diode pumped solid state lasers are many with high overall efficiency being the most important. In order to realize these advantages, the solid state laser material needs to be optimized for diode laser pumping and for the particular application. In the case of the Nd laser, materials with a longer upper level radiative lifetime are desirable. This is because the laser diode is fundamentally a cw source, and to obtain high energy storage, a long integration time is necessary. Fluoride crystals are investigated as host materials for the Nd laser and also for IR laser transitions in other rare earths, such as the 2 micron Ho laser and the 3 micron Er laser. The approach is to investigate both known crystals, such as BaY2F8, as well as new crystals such as NaYF8. Emphasis is on the growth and spectroscopy of BaY2F8. These two efforts are parallel efforts. The growth effort is aimed at establishing conditions for obtaining large, high quality boules for laser samples. This requires numerous experimental growth runs; however, from these runs, samples suitable for spectroscopy become available.

  1. Electrical Energy Storage Systems Feasibility; the Case of Terceira Island

    Directory of Open Access Journals (Sweden)

    Ana Rodrigues

    2017-07-01

    Full Text Available The Azores Regional Government, through the Sustainable Energy Action Plan for the Azorean Islands, assumed that by the year 2018, 60% of electricity would be generated from renewable energy sources. Nevertheless, by increasing renewable energy sources share in the electricity mix, peak energy that exceeds grid capacity cannot be used unless when considering energy storage systems. Therefore, this article aims at determining, among batteries and Pumped Hydro Systems, the most cost-effective energy storage system to deploy in Terceira Island, along with geothermal, wind, thermal and bio waste energy, while considering demand and supply constraints. It is concluded that a pumped hydro system sited in Serra do Morião-Nasce Água is the best option for storage of the excess generated energy when compared with batteries. However, further studies should analyze environmental constraints. It is demonstrated that by increasing the storage power capacity, a pumped hydro system improves its cost efficiency when compared with batteries. It is also demonstrated that, to ensure quality, economic feasibility, reliability and a reduction of external costs, it is preferable to replace fuel-oil by wind to generate electricity up to a conceivable technical limit, while building a pumped hydro system, or dumping the excess peak energy generated.

  2. Constant-Pressure Hydraulic Pump

    Science.gov (United States)

    Galloway, C. W.

    1982-01-01

    Constant output pressure in gas-driven hydraulic pump would be assured in new design for gas-to-hydraulic power converter. With a force-multiplying ring attached to gas piston, expanding gas would apply constant force on hydraulic piston even though gas pressure drops. As a result, pressure of hydraulic fluid remains steady, and power output of the pump does not vary.

  3. [Treatment by external insulin pump].

    Science.gov (United States)

    Clavel, Sylvaine

    2010-12-01

    Since the recent recommendations by the French speaking association for research on diabetes and metabolic illnesses (Alfediam), treatment by insulin pump has found itself in competition with basal-bolus, a procedure using similar injections of insulin which has become a benchmark treatment. The latest Alfediam guidelines focus on defining ways of treating diabetics with an external insulin pump.

  4. High Temperature Thermoacoustic Heat Pump

    Energy Technology Data Exchange (ETDEWEB)

    Tijani, H.; Spoelstra, S. [ECN Biomass and Energy Efficiency, Petten (Netherlands)

    2012-07-15

    Thermoacoustic technology can provide new types of heat pumps that can be deployed in different applications. Thermoacoustic heat pumps can for example be applied in dwellings to generate cooling or heating. Typically, space and water heating makes up about 60% of domestic and office energy consumption. The application of heat pumps can contribute to achieve energy savings and environmental benefits by reducing CO2 and NOx emissions. This paper presents the study of a laboratory scale thermoacoustic-Stirling heat pump operating between 10C and 80C which can be applied in domestics and offices. The heat pump is driven by a thermoacoustic-Stirling engine. The experimental results show that the heat pump pumps 250 W of heat at 60C at a drive ratio of 3.6 % and 200 W at 80C at a drive ratio of 3.5 %. The performance for both cases is about 40% of the Carnot performance. The design, construction, and performance measurements of the heat pump will be presented and discussed.

  5. Ion-Pumping Microbial Rhodopsins

    Directory of Open Access Journals (Sweden)

    Hideki eKandori

    2015-09-01

    Full Text Available Rhodopsins are light-sensing proteins used in optogenetics. The word rhodopsin originates from the Greek words rhodo and opsis, indicating rose and sight, respectively. Although the classical meaning of rhodopsin is the red-colored pigment in our eyes, the modern meaning of rhodopsin encompasses photoactive proteins containing a retinal chromophore in animals and microbes. Animal and microbial rhodopsins possess 11-cis and all-trans retinal, respectively, to capture light in seven transmembrane α-helices, and photoisomerizations into all-trans and 13-cis forms, respectively, initiate each function. Ion-transporting proteins can be found in microbial rhodopsins, such as light-gated channels and light-driven pumps, which are the main tools in optogenetics. Light-driven pumps, such as archaeal H+ pump bacteriorhodopsin (BR and Cl- pump halorhodopsin (HR, were discovered in the 1970s, and their mechanism has been extensively studied. On the other hand, different kinds of H+ and Cl- pumps have been found in marine bacteria, such as proteorhodopsin (PR and Fulvimarina pelagi rhodopsin (FR, respectively. In addition, a light-driven Na+ pump was found, Krokinobacter eikastus rhodopsin 2 (KR2. These light-driven ion-pumping microbial rhodopsins are classified as DTD, TSA, DTE, NTQ and NDQ rhodopsins for BR, HR, PR, FR and KR2, respectively. Recent understanding of ion-pumping microbial rhodopsins is reviewed in this paper.

  6. The Comparisons of Commonly Used Pumps in Petrochemical%浅谈石化常用泵的比较

    Institute of Scientific and Technical Information of China (English)

    龚智喜; 刘鹏飞

    2012-01-01

    泵是油库的心脏,在石油储存和运输中广泛运用各种泵,掌握各类泵的优缺点、泵的使用范围和泵适合输送油品的种类对更好的利用各种泵尤为重要。只有合理的使用各类泵,才能保证泵的高效运行,才能确保油库的安全等。文章就是针对离心泵,容积泵,以及其他石化行业经常用到的泵做了一个比较细致的总结和概括。%A pump was the heart of an oil depot, a variety kinds of pumps were widely used in oil storage and trans- portation. Mastering the advantages and disadvantages of all kinds of pumps, the usable ranges of pumps and the pumps suitable for transporting different kinds of oil was quite important for the better usage of various pumps. Only the reasonable usage of various pumps can ensure the efficient operation of pumps and the safety of oil depots, etc. The detailed summary and conclusion of centrifugal pumps, positive displacement pumps, and other petrochemical industry used pumps was made.

  7. Insulin pump therapy in pregnancy.

    Science.gov (United States)

    Kesavadev, Jothydev

    2016-09-01

    Control of blood glucose during pregnancy is difficult because of wide variations, ongoing hormonal changes and mood swings. The need for multiple injections, pain at the injection site, regular monitoring and skillful handling of the syringes/pen further makes insulin therapy inconvenient. Insulin pump is gaining popularity in pregnancy because it mimics the insulin delivery of a healthy human pancreas. Multiple guidelines have also recommended the use of insulin pump in pregnancy to maintain the glycaemic control. The pump can release small doses of insulin continuously (basal), or a bolus dose close to mealtime to control the spike in blood glucose after a meal and the newer devices can shut down insulin delivery before the occurrence of hypoglycaemia. Pump insulin of choice is rapid acting analogue insulin. This review underscores the role of insulin pump in pregnancy, their usage, advantages and disadvantages in the light of existing literature and clinic experience.

  8. A data pump for communication

    Science.gov (United States)

    Kang, Myong H.; Moskowitz, Ira S.

    1995-09-01

    As computer systems become more open and interconnected, the need for reliable and secure communication also increases. In this paper, we introduce a communication device, the Pump, that balances the requirements of reliability and security. The Pump provides acknowledgements (ACK's) to the message source to insure reliability. These ACK's are also used to regulate the source to prevent the Pump's buffer from becoming/staying full. This is desirable because once the buffer is filled there exists a huge covert communication channel. The Pump controls the input rate from the source by attempting to slave the input rate to the service rate through the randomized ACK back to the source. An analysis of the covert channel is also presented. The purpose of the covert channel analysis is to provide guidelines for the designer of the Pump to choose appropriate design parameters (e.g., size of buffer) dependent upon the analysis presented in this paper and system requirements.

  9. Peltier heat pumps. Peltiervaermepumpar

    Energy Technology Data Exchange (ETDEWEB)

    Torstensson, H. (Studsvik Energy, Nykoeping (SE))

    1990-06-01

    Todays Peltier devices in heat pump applications gives a low coeffificent of performance. A temperature difference of 40 deg C results in a COP-value of approx. 1.3. Peltier devices are manufactured of alloys composed of heavy elements like tellurium, selenium, bismuth and antimony. These elements thermoelectrical properties, figure of merit are decisive to the performance of the Peltier devices. An upper limit for the figure of merit, ZT, is said to be 2, which at {Delta}T=40 deg C would yield a COP of 2.0 as a maximum. Organic compounds have been investigated with regard to the electric conductivity. Thin film technique have been used for Peltier devices in micro-scale. There are no large-scale applications. The method does not give enhanced termoelectrical properties, but more rational and cheaper manufacturing. (author) (47 refs., 26 figs.).

  10. Self pumping magnetic cooling

    Science.gov (United States)

    Chaudhary, V.; Wang, Z.; Ray, A.; Sridhar, I.; Ramanujan, R. V.

    2017-01-01

    Efficient thermal management and heat recovery devices are of high technological significance for innovative energy conservation solutions. We describe a study of a self-pumping magnetic cooling device, which does not require external energy input, employing Mn-Zn ferrite nanoparticles suspended in water. The device performance depends strongly on magnetic field strength, nanoparticle content in the fluid and heat load temperature. Cooling (ΔT) by ~20 °C and ~28 °C was achieved by the application of 0.3 T magnetic field when the initial temperature of the heat load was 64 °C and 87 °C, respectively. These experiments results were in good agreement with simulations performed with COMSOL Multiphysics. Our system is a self-regulating device; as the heat load increases, the magnetization of the ferrofluid decreases; leading to an increase in the fluid velocity and consequently, faster heat transfer from the heat source to the heat sink.

  11. PLT rotating pumped limiter

    Energy Technology Data Exchange (ETDEWEB)

    Cohen, S.A.; Budny, R.V.; Corso, V.; Boychuck, J.; Grisham, L.; Heifetz, D.; Hosea, J.; Luyber, S.; Loprest, P.; Manos, D.

    1984-07-01

    A limiter with a specially contoured front face and the ability to rotate during tokamak discharges has been installed in a PLT pump duct. These features have been selected to handle the unique particle removal and heat load requirements of ICRF heating and lower-hybrid current-drive experiments. The limiter has been conditioned and commissioned in an ion-beam test stand by irradiation with 1 MW power, 200 ms duration beams of 40 keV hydrogen ions. Operation in PLT during ohmic discharges has proven the ability of the limiter to reduce localized heating caused by energetic electron bombardment and to remove about 2% of the ions lost to the PLT walls and limiters.

  12. Electric fluid pump

    Science.gov (United States)

    Van Dam, Jeremy Daniel; Turnquist, Norman Arnold; Raminosoa, Tsarafidy; Shah, Manoj Ramprasad; Shen, Xiaochun

    2015-09-29

    An electric machine is presented. The electric machine includes a hollow rotor; and a stator disposed within the hollow rotor, the stator defining a flow channel. The hollow rotor includes a first end portion defining a fluid inlet, a second end portion defining a fluid outlet; the fluid inlet, the fluid outlet, and the flow channel of the stator being configured to allow passage of a fluid from the fluid inlet to the fluid outlet via the flow channel; and wherein the hollow rotor is characterized by a largest cross-sectional area of hollow rotor, and wherein the flow channel is characterized by a smallest cross-sectional area of the flow channel, wherein the smallest cross-sectional area of the flow channel is at least about 25% of the largest cross-sectional area of the hollow rotor. An electric fluid pump and a power generation system are also presented.

  13. Heat pumps in industry. Pt. 2: Applications

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M. [Padova Univ., Vicenza (Italy). Ist. di Ingegneria Gestionale

    1995-04-01

    A selection of applications of heat pumps in industry is described, reporting plant lay-outs and performances. The selection includes compression heat pumps at different temperatures, vapour recompression systems, absorption heat pumps and heat transformers. (author)

  14. Electrical Energy Storage for the Grid: A Battery of Choices

    Science.gov (United States)

    Dunn, Bruce; Kamath, Haresh; Tarascon, Jean-Marie

    2011-11-01

    The increasing interest in energy storage for the grid can be attributed to multiple factors, including the capital costs of managing peak demands, the investments needed for grid reliability, and the integration of renewable energy sources. Although existing energy storage is dominated by pumped hydroelectric, there is the recognition that battery systems can offer a number of high-value opportunities, provided that lower costs can be obtained. The battery systems reviewed here include sodium-sulfur batteries that are commercially available for grid applications, redox-flow batteries that offer low cost, and lithium-ion batteries whose development for commercial electronics and electric vehicles is being applied to grid storage.

  15. Electrical energy storage for the grid: a battery of choices.

    Science.gov (United States)

    Dunn, Bruce; Kamath, Haresh; Tarascon, Jean-Marie

    2011-11-18

    The increasing interest in energy storage for the grid can be attributed to multiple factors, including the capital costs of managing peak demands, the investments needed for grid reliability, and the integration of renewable energy sources. Although existing energy storage is dominated by pumped hydroelectric, there is the recognition that battery systems can offer a number of high-value opportunities, provided that lower costs can be obtained. The battery systems reviewed here include sodium-sulfur batteries that are commercially available for grid applications, redox-flow batteries that offer low cost, and lithium-ion batteries whose development for commercial electronics and electric vehicles is being applied to grid storage.

  16. Groundwater Storage vs. Surface Water Storage - Why Sustainability Requires a Different Management Framework

    Science.gov (United States)

    Mehl, S.; Davids, J. C.

    2015-12-01

    Storing water in times of excess for use in times of shortage is an essential water-management tool, especially in climates typified by precipitation in one season and demand in another. The three primary water storage mechanisms in the Western US, and much of the world in fact, are: seasonal snow pack, surface water reservoirs, and groundwater aquifers. In California, nearly every major river has one or more large dam and reservoir and current focus has shifted toward off-stream storage. In addition to California's surface reservoirs, groundwater aquifers provide huge volumes of water storage that are heavily utilized during times of drought. With California's new Sustainable Groundwater Management Act (SGMA) substantial attention is presently focused on developing strategies for using groundwater storage more effectively in conjunction with surface-storage reservoirs. However, compared to surface water storage, we need to think differently and develop new frameworks if we want to manage groundwater storage sustainably. Despite its immense capacity, groundwater storage is harder to manage because there are physical constraints to how fast water can be put into and withdrawn from aquifers, its boundaries are not as well defined as those of a surface reservoir, and it is part of a dynamic, porous media flow system where the Theis concepts of capture govern. Therefore, groundwater does not behave as a level pool like surface water reservoirs, which has several implications for effective management: 1) extraction/injection locations can have substantial impacts on the system, 2) interactions with the surface water systems can be nonlinear and complex and 3) hydraulic effects can continue long after pumping/injection has stopped. These nonlinear spatial and temporal responses, coupled with long time scales, makes management of groundwater storage much different than surface water storage. Furthermore, failure to fully understand these issues can lead to mismanagement

  17. Automatic Control of Water Pumping Stations

    Institute of Scientific and Technical Information of China (English)

    Muhannad Alrheeh; JIANG Zhengfeng

    2006-01-01

    Automatic Control of pumps is an interesting proposal to operate water pumping stations among many kinds of water pumping stations according to their functions.In this paper, our pumping station is being used for water supply system. This paper is to introduce the idea of pump controller and the important factors that must be considering when we want to design automatic control system of water pumping stations. Then the automatic control circuit with the function of all components will be introduced.

  18. Investigation into the potential of energy storage to tackle intermittency in renewable energy generation

    OpenAIRE

    Barbour, Edward

    2013-01-01

    Renewable Energy is by nature intermittent and matching the supply of energy to specific time dependent demand poses huge challenges. Energy storage is a useful tool in handling this temporal disparity, although except for regions very suitable for pumped hydroelectric storage schemes, it suffers from being technically difficult to implement and costly as a result. This study investigates the potential benefits offered by various scales of energy storage to different types of r...

  19. Cost and size estimates for an electrochemical bulk energy storage concept

    Science.gov (United States)

    Warshay, M.; Wright, L. O.

    1975-01-01

    Preliminary capital cost and size estimates were made for an electrochemical bulk energy storage concept for a redox-flow-cell system. Preliminary calculations showed that the redox-flow-cell system has great promise as a bulk energy storage system for power load leveling. The size of the system was estimated to be less than 2 percent of the size of a comparable pumped hydroelectric storage plant.

  20. Analysis of pumping tests: Significance of well diameter, partial penetration, and noise

    Science.gov (United States)

    Heidari, M.; Ghiassi, K.; Mehnert, E.

    1999-01-01

    The nonlinear least squares (NLS) method was applied to pumping and recovery aquifer test data in confined and unconfined aquifers with finite diameter and partially penetrating pumping wells, and with partially penetrating piezometers or observation wells. It was demonstrated that noiseless and moderately noisy drawdown data from observation points located less than two saturated thicknesses of the aquifer from the pumping well produced an exact or acceptable set of parameters when the diameter of the pumping well was included in the analysis. The accuracy of the estimated parameters, particularly that of specific storage, decreased with increases in the noise level in the observed drawdown data. With consideration of the well radii, the noiseless drawdown data from the pumping well in an unconfined aquifer produced good estimates of horizontal and vertical hydraulic conductivities and specific yield, but the estimated specific storage was unacceptable. When noisy data from the pumping well were used, an acceptable set of parameters was not obtained. Further experiments with noisy drawdown data in an unconfined aquifer revealed that when the well diameter was included in the analysis, hydraulic conductivity, specific yield and vertical hydraulic conductivity may be estimated rather effectively from piezometers located over a range of distances from the pumping well. Estimation of specific storage became less reliable for piezemeters located at distances greater than the initial saturated thickness of the aquifer. Application of the NLS to field pumping and recovery data from a confined aquifer showed that the estimated parameters from the two tests were in good agreement only when the well diameter was included in the analysis. Without consideration of well radii, the estimated values of hydraulic conductivity from the pumping and recovery tests were off by a factor of four.The nonlinear least squares method was applied to pumping and recovery aquifer test data in

  1. CFD Investigation of Complex Phenomena in S-Shape Region of Reversible Pump-Turbine

    Science.gov (United States)

    Jacquet, C.; Fortes-Patella, R.; Balarac, L.; Houdeline, J.-B.

    2016-11-01

    Pumped Storage Plants (PSP) using reversible pump-turbines offer the possibility to store large amounts of energy with high efficiency and at reasonable cost. For reversible high head pump-turbines, the characteristic curves exhibit an S-shape in the turbine, turbine break and reverse pump quadrants. This S-shape leads to unstable behaviour of the turbine when coupling to the grid (for small guide vane opening) or to surge transient phenomena in case of emergency shutdown (for large guide vane opening). Typically the piping system can be exposed to severe pressure oscillations. Furthermore, the flow inside the pump-turbine is characterized by unsteady complex hydrodynamic phenomena. These phenomena have to be deeply investigated to improve the behaviour of the pump-turbine in such operating conditions. This paper focuses on the numerical analysis of the flow in a reversible pump-turbine in the S- shape region. For this application, we used unsteady computation applying the SAS-SST turbulence model and considered a full computational domain that includes all the component of the pump-turbine. The study highlights the evolution of the flow behaviour for a large range of operating conditions: from the optimal efficiency point to the zero discharge condition, for a given constant guide vane opening.

  2. Pumping of titanium sapphire laser

    Science.gov (United States)

    Jelínková, H.; Vaněk, P.; Valach, P.; Hamal, K.; Kubelka, J.; Škoda, V.; Jelínek, M.

    1993-02-01

    Two methods of Ti:Sapphire pumping for the generation of tunable laser radiation in the visible region were studied. For coherent pumping, the radiation of the second harmonic of a Nd:YAP laser was used and a maximum output energy of E out=4.5 mJ was reached from the Ti:Sapphire laser. For noncoherent pumping, two different lengths of flashlamp pulses were used and a maximum of E out=300 mJ was obtained. Preliminary estimations of the wavelength range of tunability were made.

  3. Industrial heat pump assessment study

    Science.gov (United States)

    Chappell, R. N.; Priebe, S. J.; Wilfert, G. L.

    1989-03-01

    This report summarizes preliminary studies that assess the potential of industrial heat pumps for reduction of process heating requirements in industries receiving power from the Bonneville Power Administration (BPA). This project was initiated at the request of BPA to determine the potential of industrial heat pumps in BPA's service area. Working from known heat pump principles and from a list of BPA's industrial customers, the authors estimated the fuel savings potential for six industries. Findings indicate that the pulp and paper industry would yield the greatest fuel savings and increased electrical consumption. Assessments presented in this report represent a cooperative effort between The Idaho National Engineering Laboratory (INEL), and Battelle-Northwest Laboratories.

  4. Heat pumps for the home

    CERN Document Server

    Cantor, John

    2013-01-01

    In recent years, heat pumps have emerged as a promising new form of technology with a relatively low environmental impact. Moreover, they have presented householders with an opportunity to reduce their heating bills. Heat pumps can heat a building by 'pumping' heat from either the ground or the air outside: an intriguing process which utilizes principles that are somewhat analogous to those employed in the domestic refrigerator. Armed with the practical information contained in these pages, homeowners will have the necessary knowledge to take advantage of this potentially low-carbon t

  5. Zeeman Electromagnetically Induced Transparency with crossed pump and probe beams: Small angle dependence

    Science.gov (United States)

    Campbell, Kaleb; Madkhaly, Samaya; de Medeiros, Dillon; Bali, Samir; Macklin Quantum Information Sciences Collaboration

    2016-05-01

    Progress toward undergraduate oriented experiments on image storage in room-temperature atomic vapor using Electromagnetically Induced Transparency is described. Using a scanning longitudinal magnetic field technique we diagnose and suppress stray magnetic fields and polarization impurity. We consider the pump-probe angular dependence of the EIT signal but at much smaller angles of less than a milliradian.

  6. Stability of aztreonam in a portable pump reservoir used for home intravenous antibiotic treatment (HIVAT)

    NARCIS (Netherlands)

    Vinks, A A; Touw, D J; van Rossen, R C; Heijerman, H G; Bakker, W

    1996-01-01

    The stability of the monocyclic beta-lactam antibiotic aztreonam in portable pump reservoirs was studied during storage at temperatures of -20 degrees C and +5 degrees C and during drug delivery at 37 degrees C. Three 100-ml drug reservoirs and three glass containers containing 60 mg/ml aztreonam we

  7. Method for controlling powertrain pumps

    Science.gov (United States)

    Sime, Karl Andrew; Spohn, Brian L; Demirovic, Besim; Martini, Ryan D; Miller, Jean Marie

    2013-10-22

    A method of controlling a pump supplying a fluid to a transmission includes sensing a requested power and an excess power for a powertrain. The requested power substantially meets the needs of the powertrain, while the excess power is not part of the requested power. The method includes sensing a triggering condition in response to the ability to convert the excess power into heat in the transmission, and determining that an operating temperature of the transmission is below a maximum. The method also includes determining a calibrated baseline and a dissipation command for the pump. The calibrated baseline command is configured to supply the fluid based upon the requested power, and the dissipation command is configured to supply additional fluid and consume the excess power with the pump. The method operates the pump at a combined command, which is equal to the calibrated baseline command plus the dissipation command.

  8. High Performance Space Pump Project

    Data.gov (United States)

    National Aeronautics and Space Administration — PDT is proposing a High Performance Space Pump based upon an innovative design using several technologies. The design will use a two-stage impeller, high temperature...

  9. Heat pumps at the maltings

    Energy Technology Data Exchange (ETDEWEB)

    1987-11-01

    Heat pumps have halved the energy costs of producing finished malt at two of the country's maltsters. The fuel-fired kilning processes described are now performed by heat pumps with considerable energy and production benefits at the maltings of J.P. Simpson and Co. (Alnwick) Ltd, in Tivetshall St Margaret, Norfolk, and of Munton and Fison Plc of Stowmarket, Suffolk. The heat pump system installed at the Station Malting of J.P. Simpson was devised by the Electricity Council Research Centre at Capenhurst near Chester. Energy cost benefits of Pound 6,000 a month are being realised at Simpsons, but there is the added benefit that the system has been designed to provide conditioned air to the germination cycle to ensure that the correct temperature is maintained throughout the year. At the Cedars factory of Munton and Fison, heat pumps were used on a trial basis for plant micropropagation and for a fish farming unit.

  10. Magnetic heat pump flow director

    Science.gov (United States)

    Howard, Frank S. (Inventor)

    1995-01-01

    A fluid flow director is disclosed. The director comprises a handle body and combed-teeth extending from one side of the body. The body can be formed of a clear plastic such as acrylic. The director can be used with heat exchangers such as a magnetic heat pump and can minimize the undesired mixing of fluid flows. The types of heat exchangers can encompass both heat pumps and refrigerators. The director can adjust the fluid flow of liquid or gas along desired flow directions. A method of applying the flow director within a magnetic heat pump application is also disclosed where the comb-teeth portions of the director are inserted into the fluid flow paths of the heat pump.

  11. Transverse pumped laser amplifier architecture

    Science.gov (United States)

    Bayramian, Andrew James; Manes, Kenneth; Deri, Robert; Erlandson, Al; Caird, John; Spaeth, Mary

    2013-07-09

    An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.

  12. Thermal efficiency improvements : a chemical heat pump system application

    Energy Technology Data Exchange (ETDEWEB)

    Mert, M.S.; Salt, I.; Bolat, E. [Yildiz Technical Univ., Istanbul (Turkey). Dept. of Chemical Engineering; Karaca, F. [Marmara Univ., Istanbul (Turkey). Dept. of Chemical Engineering

    2006-07-01

    Chemical heat pumps are used to upgrade thermal energy and provide energy storage without losses. The feasibility of an n-hexane/1-hexane/hydrogen chemical heat pump system based on the dehydrogenation of n-hexane at low temperatures and 1-hexane at high temperatures was investigated. Theoretical analysis was carried out using related thermodynamic and equilibrium data to determine the thermal efficiency of the cycle. The latent heats of vaporization at normal boiling points for n-hexane and 1-hexane were calculated using a Riedel equation. Heat capacities as a function of temperature were calculated by Missenard group contribution and Rowlinson-Bondi methods. Estimated C{sub PL} values were presented. The effect of temperature on the Standart heat of reaction was calculated. Gibbs free energy was expressed as a function of temperature. Results indicated that a high 1-hexane concentration in the liquid mixture was required. The ratio of upgraded heat to supplied heat was the key parameter for estimating the thermal coefficient of performance (COP). It was observed that the efficiency of the pump increased with an increase in low level hydrogenation pressure. It was concluded that designing a chemical heat pump involves the consideration of a variety of interacting parameters. 17 refs., 5 tabs., 3 figs.

  13. Storage and flood routing

    Science.gov (United States)

    Carter, R.W.; Godfrey, R.G.

    1960-01-01

    The basic equations used in flood routing are developed from the law of continuity. In each method the assumptions are discussed to enable the user to select an appropriate technique. In the stage-storage method the storage is related to the mean gage height in the reach under consideration. In the discharge-storage method the storage is determined, from weighted values of inflow and outflow discharge. In the reservoir-storage method the storage is considered as a function of outflow discharge alone. A detailed example is given for each method to illustrate that particular technique.

  14. Massive Storage Systems

    Institute of Scientific and Technical Information of China (English)

    Dan Feng; Hai Jin

    2006-01-01

    To accommodate the explosively increasing amount of data in many areas such as scientific computing and e-Business, physical storage devices and control components have been separated from traditional computing systems to become a scalable, intelligent storage subsystem that, when appropriately designed, should provide transparent storage interface, effective data allocation, flexible and efficient storage management, and other impressive features. The design goals and desirable features of such a storage subsystem include high performance, high scalability, high availability, high reliability and high security. Extensive research has been conducted in this field by researchers all over the world, yet many issues still remain open and challenging. This paper studies five different online massive storage systems and one offline storage system that we have developed with the research grant support from China. The storage pool with multiple network-attached RAIDs avoids expensive store-and-forward data copying between the server and storage system, improving data transfer rate by a factor of 2-3 over a traditional disk array. Two types of high performance distributed storage systems for local-area network storage are introduced in the paper. One of them is the Virtual Interface Storage Architecture (VISA) where VI as a communication protocol replaces the TCP/IP protocol in the system. VISA's performance is shown to achieve better than that of IP SAN by designing and implementing the vSCSI (VI-attached SCSI) protocol to support SCSI commands in the VI network. The other is a fault-tolerant parallel virtual file system that is designed and implemented to provide high I/O performance and high reliability. A global distributed storage system for wide-area network storage is discussed in detail in the paper, where a Storage Service Provider is added to provide storage service and plays the role of user agent for the storage system. Object based Storage Systems not only

  15. Heat Pumps in Private Residences used for Grid Balancing by Demand Response Methods

    DEFF Research Database (Denmark)

    Nielsen, Kirsten M.; Pedersen, Tom S.; Andersen, Palle

    2012-01-01

    Increased production of renewable energy as wind energy will give a fluctuating production which requires flexible energy storages. Heat capacity in single-family houses with electrical heating using heat pumps represents a storage which can be used to balance the electricity supply. It is assumed....... The minimization results in a power consumption schedule and a temperature schedule for each house. A number of control structures are described aiming to obtain this optimum by communicating references to either house temperature or heat pump power or by offering the consumer an hour by hour price. By simulation...... the schemes are compared by there ability to time shift consumption and to avoid consumer discomfort. Additionally the necessary information exchange for the schemes is discussed. Comparisons indicate that it is possible to use heat pump heated private houses to move power consumption within a time interval...

  16. Pump control system for windmills

    Science.gov (United States)

    Avery, Don E.

    1983-01-01

    A windmill control system having lever means, for varying length of stroke of the pump piston, and a control means, responsive to the velocity of the wind to operate the lever means to vary the length of stroke and hence the effective displacement of the pump in accordance with available wind energy, with the control means having a sensing member separate from the windmill disposed in the wind and displaceable thereby in accordance with wind velocity.

  17. Diode-pumped dye laser

    Science.gov (United States)

    Burdukova, O. A.; Gorbunkov, M. V.; Petukhov, V. A.; Semenov, M. A.

    2016-10-01

    This letter reports diode pumping for dye lasers. We offer a pulsed dye laser with an astigmatism-compensated three-mirror cavity and side pumping by blue laser diodes with 200 ns pulse duration. Eight dyes were tested. Four dyes provided a slope efficiency of more than 10% and the highest slope efficiency (18%) was obtained for laser dye Coumarin 540A in benzyl alcohol.

  18. Optical Pumping of Molecular Gases

    Science.gov (United States)

    1976-04-01

    in Hg, excimer system. IV. OPTICALLY PUMPED Na Ř The details of our optical pumping studies of Na2 are presented in Appendix I. The study showed that...inversitot In IM -Second set of linesn have. tentatively been Identified ats D asid A btuu~t-sa A-band tratsitiwts termiuiatitig, oilt*n 3,4,5 for J0 TO HELIUM

  19. 33 CFR 183.524 - Fuel pumps.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Fuel pumps. 183.524 Section 183... SAFETY BOATS AND ASSOCIATED EQUIPMENT Fuel Systems Equipment Standards § 183.524 Fuel pumps. (a) Each diaphragm pump must not leak fuel from the pump if the primary diaphragm fails. (b) Each...

  20. 14 CFR 29.991 - Fuel pumps.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Fuel pumps. 29.991 Section 29.991... STANDARDS: TRANSPORT CATEGORY ROTORCRAFT Powerplant Fuel System Components § 29.991 Fuel pumps. (a) Compliance with § 29.955 must not be jeopardized by failure of— (1) Any one pump except pumps that...