WorldWideScience

Sample records for blowers

  1. Ring blowers. Ring blower

    Energy Technology Data Exchange (ETDEWEB)

    Nakahara, Y.; Okamura, T.; Takahashi, M. (Fuji Electric Co. Ltd., Tokyo (Japan))

    1991-06-10

    Features, structures and several products of ring blowers were outlined. The ring blower is featured by its medium characteristics because it is higher in air pressure than a turboblower and larger in airflow than a vane blower, and it is applicable flexibly to not only air blasting but various industrial fields such as suction transfer. As several products corresponding to various fields, the followings were outlined: the low noise type with optimum shapes of inlet, outlet and casing cover for reducing noises by 10 dB or more, the heat resistant, water-tight and explosion-proof types suitable for severe environmental conditions, the multi-voltage type for every country served at different voltages, the high air pressure type with two pressure rise stages, and the large airflow type with a wide impeller. In addition, as special use products, the glass fiber reinforced unsatulated polyester ring blower for respiration apparatus, and the variable speed blushless DC motor-driven one for medical beds were outlined. 2 refs., 9 figs., 1 tab.

  2. Blowers; Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, C. [Forschungsstelle fuer Energiewirtschaft, Muenchen (Germany); Pfitzner, G. [Forschungsstelle fuer Energiewirtschaft, Muenchen (Germany)

    1994-11-01

    In the framework of the partial project ``Interdisciplinary Technologies`, Vol. 8.06 reports on problems of blower engineering: System requiremsnts (applications of blowers); Technical descriptions (characteristics, capacity, performance, cost, similarity laws, types, control processes); Descriptions of systems and plants (design, circuiting); Data compilations and data sheets; Summary analysis. (HW) [Deutsch] Im Rahmen der Teilprojekte ``Querschnittstechniken`` wird hier in Band 8.06 ueber Probleme der Ventilatortechnik berichtet. - Systemanforderungen (Einsatzbereiche von Ventilatoren); - Technikbeschreibung (Kennlinien, Leistung, Wirkungsgrad, Kosten, Aehnlichkeitsgesetze, Bauartenuebersicht, Regelverfahren); - Anlagen und Systembeschreibung (Auslegung, Schaltungsverfahren); - Datensammlung und Datenblatt; - Uebergreifende Analyse. (HW)

  3. Constant-pressure Blowers

    Science.gov (United States)

    Sorensen, E

    1940-01-01

    The conventional axial blowers operate on the high-pressure principle. One drawback of this type of blower is the relatively low pressure head, which one attempts to overcome with axial blowers producing very high pressure at a given circumferential speed. The Schicht constant-pressure blower affords pressure ratios considerably higher than those of axial blowers of conventional design with approximately the same efficiency.

  4. Blower test stand; Luftleistungspruefstand

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2003-04-01

    Blowers move air, but how much air? Extensive measurements are required for assessing blower performance in terms of the actual air flow volume. The most precise results are obtained in a test stand. [German] Luefter bewegen Luft. Aber wie viel wird tatsaechlich bewegt? Fuer die Bestimmung der tatsaechlichen Luftfoerderleistung ist ein grosser Messaufwand notwendig, die praezisesten Ergebnisse bringt ein Luftleistungsmessstand. (orig.)

  5. Variable displacement blower

    Science.gov (United States)

    Bookout, Charles C.; Stotts, Robert E.; Waring, Douglass R.; Folsom, Lawrence R.

    1986-01-01

    A blower having a stationary casing for rotatably supporting a rotor assembly having a series of open ended chambers arranged to close against the surrounding walls of the casing. Pistons are slidably mounted within each chamber with the center of rotation of the pistons being offset in regard to the center of rotation of the rotor assembly whereby the pistons reciprocate in the chambers as the rotor assembly turns. As inlet port communicates with the rotor assembly to deliver a working substance into the chamber as the pistons approach a top dead center position in the chamber while an outlet port also communicates with the rotor to exhaust the working substance as the pistons approach a bottom dead center position. The displacement of the blower is varied by adjusting the amount of eccentricity between the center of rotation of the pistons and the center of rotation of the rotor assembly.

  6. Blowers. 2. ed.; Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Bommes, L.; Fricke, J.; Grundmann, R. (eds.)

    2003-07-01

    Economic efficiency, high availability, materials and wear resistance are still the main goals of development on the blower sector, together with noise reduction. Subjects: (a) Modified methods for calculation and design of axial and radial blowers; (b) Test stand measurements of aerodynamic and acoustic performance; (c) Problems of experimental determination of performance data; (d) effects of the installation conditions and thre resulting electric field disturbances influencing the aerodynamic and acoustic blower characteristics; (e) Centrifugal and vibration loads on the rotors; (f) Determination of the axial thrust of radial blowers; (g) Special designs and specifications for special applications; (h) Blower noise: Sources, measurement, prediction; (i) Noise reduction measures; (j) Specific aspects of working with solid-gas mixtures. The book presents a wide range of research findings, modern design methods and problem solutions. Fundamentals of fluidics, thermodynamics, similarity mechanics and aeroacoustics are discussed in detail in as far as they are of importance for blower construction. This second edition was revised with a view to practical applicability and to the latest state of research. (orig.) [German] Ventilatoren sind zentraler Bestandteil aller lueftungstechnischen Anlagen- und Geraetesysteme und daher fuer deren Funktionstuechtigkeit von ausschlaggebender Bedeutung. Sie zaehlen nach der heute gueltigen Definition zu den Stroemungsmaschinen, in denen mechanische Energie in Stroemungsenergie umgewandelt wird. Nach der Norm reicht bei Ventilatoren der Bereich der Druckerhoehung des Foerdermediums zwischen Ventilatoreintritt und -austritt bis zu 30 000 Pa, entsprechend einem Druckverhaeltnis bis zu 1,3. Hauptentwicklungsziele bei Ventilatoren sind nach wie vor die Steigerung der Wirtschaftlichkeit, Betriebssicherheit, Werkstoffbelastbarkeit und Verschleissfestigkeit. Darueber hinaus spielen im Rahmen des staendig wachsenden Umweltbewusstseins

  7. [Respiratory function in glass blowers].

    Science.gov (United States)

    Zuskin, E; Butković, D; Mustajbegović, J

    1992-01-01

    The prevalence of chronic and acute respiratory symptoms and diseases and changes in lung function in a group of 80 glass blowers have been investigated. In addition a group of 80 not exposed workers was used as a control group for respiratory symptoms and diseases. In glass blowers, there was significant increase in prevalence of chronic bronchitis, nasal catarrh, and sinusitis than in the controls. Glass blowers exposed for more and less than 10 years had similar prevalences of respiratory symptoms. A large number of glass blowers complained of acute across-shift symptoms. Significant increase in FVC, FEF50 and FEF25 was documented at the end of the work shift. Comparison with predicted normal values showed that glass blowers had FVC and FEF25 significantly lower than predicted. RV and RV/TLC were significantly increased compared with the predicted normal values. DLCO was within the normal values in most glass blowers. It is concluded that work in the glass blower industry is likely to lead the development of chronic respiratory disorders.

  8. Noise Emission from Laboratory Air Blowers

    Science.gov (United States)

    Rossing, Thomas D.; Windham, Betty

    1978-01-01

    Product noise ratings for a number of laboratory air blowers are reported and several recommendations for reducing laboratory noise from air blowers are given. Relevant noise ratings and methods for measuring noise emission of appliances are discussed. (BB)

  9. Investigations on Experimental Impellers for Axial Blowers

    Science.gov (United States)

    Encke, W.

    1947-01-01

    A selection of measurements obtained on experimental impellers for axial blowers will be reported. In addition to characteristic curves plotted for low and for high peripheral velocities, proportions and blade sections for six different blower models and remarks on the design of blowers will be presented.

  10. Increasing loads on mine centrifugal blowers

    Energy Technology Data Exchange (ETDEWEB)

    Kovalevskaya, V.I.; Pak, V.V. (Donetskii Politekhnicheskii Institut (USSR))

    1991-03-01

    Increasing output of blowers for ventilation of deep coal mines by enlarging their dimensions and increasing revolution rate is uneconomic and technically complicated. Optimization of aerodynamic characteristics of the blowers is most economic. Effects of blower blade geometry (shape and cross-section) on blower output, air pressure and efficiency are analyzed. On the basis of Euler's equations a method is discussed for determining optimum aerodynamic parameters of the modified blade geometry that guarantees the most economic blower operation. 7 refs.

  11. VARIABLE SPEED INTEGRATED INTELLIGENT HVAC BLOWER

    Energy Technology Data Exchange (ETDEWEB)

    Shixiao Wang; Herman Wiegman; Wilson Wu; John Down; Luana Iorio; Asha Devarajan; Jing Wang; Ralph Carl; Charlie Stephens; Jeannine Jones; Paul Szczesny

    2001-11-14

    This comprehensive topical report discusses the key findings in the development of a intelligent integrated blower for HVAC applications. The benefits of rearward inclined blades over that of traditional forward inclined blades is well documented and a prototype blower design is presented. A comparison of the proposed blower to that of three typical units from the industry is presented. The design of the blower housing is also addressed and the impact of size limitations on static efficiency is discussed. Issues of air flow controllability in the rearward inclined blower is addressed and a solution to this problem is proposed. Several motor design options are discussed including inside-out radial flux designs and novel axial flux designs, all are focused on the various blower needs. The control of the motor-blower and airflow through the use of a high density inverter stage and modern digital signal processor is presented. The key technical challenges of the approach are discussed. The use of the motor as a sensor in the larger heating/ventilating system is also discussed. Diagnostic results for both the motor itself and the blower system are presented.

  12. 33 CFR 154.826 - Vapor compressors and blowers.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Vapor compressors and blowers....826 Vapor compressors and blowers. (a) Each inlet and outlet to a compressor or blower which handles...) Excessive shaft bearing temperature. (d) If a centrifugal compressor, fan, or lobe blower handles vapor...

  13. Air injection vacuum blower noise control

    Energy Technology Data Exchange (ETDEWEB)

    Mose, Tyler L.A.; Faszer, Andrew C. [Noise Solutions Inc. (Canada)], email: tmose@noisesolutions.com, email: afaszer@noisesolutions.com

    2011-07-01

    Air injection vacuum blowers, with applications in waste removal, central vacuum systems, and aeration systems, are widely used when high vacuum levels are required. Noise generated by those blowers must be addressed for operator health and residential disturbance. This paper describes a project led by Noise Solutions Inc., to identify noise sources in a blower, and design and test a noise mitigation system. First the predominant noise sources in the blower must be determined, this is done with a sound level meter used to quantify the contribution of each individual noise source and the dominant tonal noise from the blower. Design of a noise abatement system must take into account constraints arising from blower mobile use, blower optimal performance, and the resulting overall vibration of the structure. The design was based on calculations from the sound attenuation of a reactive expansion chamber and two prototypes of custom silencers were then tested, showing a significant noise reduction both in total sound levels and tonal noise.

  14. Regenerative Blower for EVA Suit Ventilation Fan

    Science.gov (United States)

    Izenson, Michael G.; Chen, Weibo; Paul, Heather L.

    2010-01-01

    Portable life support systems in future space suits will include a ventilation subsystem driven by a dedicated fan. This ventilation fan must meet challenging requirements for pressure rise, flow rate, efficiency, size, safety, and reliability. This paper describes research and development that showed the feasibility of a regenerative blower that is uniquely suited to meet these requirements. We proved feasibility through component tests, blower tests, and design analysis. Based on the requirements for the Constellation Space Suit Element (CSSE) Portable Life Support System (PLSS) ventilation fan, we designed the critical elements of the blower. We measured the effects of key design parameters on blower performance using separate effects tests, and used the results of these tests to design a regenerative blower that will meet the ventilation fan requirements. We assembled a proof-of-concept blower and measured its performance at sub-atmospheric pressures that simulate a PLSS ventilation loop environment. Head/flow performance and maximum efficiency point data were used to specify the design and operating conditions for the ventilation fan. We identified materials for the blower that will enhance safety for operation in a lunar environment, and produced a solid model that illustrates the final design. The proof-of-concept blower produced the flow rate and pressure rise needed for the CSSE ventilation subsystem while running at 5400 rpm, consuming only 9 W of electric power using a non-optimized, commercial motor and controller and inefficient bearings. Scaling the test results to a complete design shows that a lightweight, compact, reliable, and low power regenerative blower can meet the performance requirements for future space suit life support systems.

  15. VARIABLE SPEED INTEGRATED INTELLIGENT HVAC BLOWER

    Energy Technology Data Exchange (ETDEWEB)

    Herman Wiegman; Charlie Stephens; Xiaoyue Liu; Ralph Carl; Sunny Zhuang; Paul Szczesny; Kamron Wright

    2003-09-23

    This comprehensive topical report discusses the key findings in the development of an advanced blower for HVAC applications. The benefits of rearward inclined blades over that of traditional forward inclined blades is well documented, and several prototype wheels are demonstrated in various housings. A comparison of retrofitted blowers to that of three typical units from the industry is presented. The design and modification of the blower housing is addressed and the impact of size limitations on static efficiency is discussed. The roadmap to rearward-inclined wheel technology insertion is presented and typical static efficiency gains are documented.

  16. Blower Cooling of Finned Cylinders

    Science.gov (United States)

    Schey, Oscar W; Ellerbrock, Herman H , Jr

    1937-01-01

    Several electrically heated finned steel cylinders enclosed in jackets were cooled by air from a blower. The effect of the air conditions and fin dimensions on the average surface heat-transfer coefficient q and the power required to force the air around the cylinders were determined. Tests were conducted at air velocities between the fins from 10 to 130 miles per hour and at specific weights of the air varying from 0.046 to 0.074 pound per cubic foot. The fin dimensions of the cylinders covered a range in pitches from 0.057 to 0.25 inch average fin thicknesses from 0.035 to 0.04 inch, and fin widths from 0.67 to 1.22 inches.

  17. Pulmonary function in commercial glass blowers.

    Science.gov (United States)

    Munn, N J; Thomas, S W; DeMesquita, S

    1990-10-01

    This study examined the pulmonary function of 87 male commercial glass factory workers. Statistical analysis of the data indicated that workers with full-time glass blowing job descriptions had significantly higher percent predicted values for FVC, FEV1 and significantly higher maximal inspiratory and expiratory muscle pressures than their cohorts with minimal or nonglass blowing job descriptions. The results of this study indicate that persons using their respiratory muscles as full-time blowers to manufacture commercial blown glass products have significantly greater lung function values than part-time blowers or their nonglass blowing co-workers.

  18. Accuracy of the blower door measurement; Genauigkeit der Blower Door-Messung. Der Einfluss von Aussenklimaparametern

    Energy Technology Data Exchange (ETDEWEB)

    Weier, H. [Hochschule fuer Technik, Wirtschaft und Sozialwesen Zittau/Goerlitz (FH), Zittau (Germany)

    2000-04-01

    The blower door is a simple to use measuring device for determing the seal of the external surfaces of buildings. The accuracy of the measurement is dependent to a considerable extent on the external climatic conditions that prevail at the time of taking the measurement. (orig.) [German] Die Blower Door ist ein einfach anzuwendendes Messgeraet zum Bestimmen der Dichtheit von Gebaeudeaussenflaechen. Die Genauigkeit der Messung ist in starkem Masse von den zum Messzeitpunkt herrschenden Aussenklimabedingungen abhaengig. (orig.)

  19. Production Facility Prototype Blower Installation Report

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-07-28

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating.  Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere.  With the increased beam heating, the helium flow requirement increased so that a larger blower was need for a mass flow rate of 400 g/s at 2.76 MPa (400 psig).  An Aerzen GM 12.4 blower was selected, and is currently being installed at the LANL facility for target and component flow testing.  This report describes this blower/motor/ppressure vessel package and the status of the facility preparations.

  20. Production Facility Prototype Blower 1000 Hour Test Results

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-10-18

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was needed for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is now installed at the LANL facility for target and component flow testing. Two extended tests of >1000 hr operation have been completed. Those results and discussion thereof are reported herein. Also included in Appendix A is the detailed description of the blower and its installation, while Appendix B documents the pressure vessel design analysis. The blower has been operated for 1000 hours as a preliminary investigation of long-term performance, operation and possible maintenance issues. The blower performed well, with no significant change in blower head or mass flow rate developed under the operating conditions. Upon inspection, some oil had leaked out of the shaft seal of the blower. The shaft seal and bearing race have been replaced. Test results and conclusions are in Appendix B.

  1. Production Facility Prototype Blower 1000 Hour Test Results

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-10-18

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was need for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is now installed at the LANL facility for target and component flow testing. Two extended test of >1000 hr operation have been completed. Those results and discussion thereof are reported herein. Also included in Appendix A is the detailed description of the blower and its installation, while Appendix B documents the pressure vessel design analysis. The blower has been operated for 1000 hours as a preliminary investigation of long term performance, operation and possible maintenance issues. The blower performed well, with no significant change in blower head or mass flow rate developed under the operating conditions. Upon inspection, some oil had leaked out of the shaft seal of the blower. The shaft seal and bearing race have been replaced. Test results and conclusions are in Appendix B.

  2. Laboratory Evaluation of Residential Furnace BlowerPerformance

    Energy Technology Data Exchange (ETDEWEB)

    Walker, Iain S.; Lutz, Jim D.

    2005-09-01

    A testing program was undertaken at Lawrence Berkeley National Laboratory and an electric utility (Pacific Gas and Electric Co.) to compare the performance of furnace blowers. This laboratory testing program was undertaken to support potential changes to California Building Standards regarding in-field furnace blower energy use. This technical support includes identifying suitable performance metrics and target performance levels for use in standards. Five different combinations of blowers and residential furnaces were tested for air moving performance. Three different types of blower and motor combinations were tested in two different furnace cabinets. The blowers were standard forward--curved impellors and a prototype impeller with reverse-inclined blades. The motors were two 6-pole permanent split capacitor (PSC) single-phase induction motors, a brushless permanent magnet (BPM) motor and a prototype BPM designed for use with a prototype reverse-inclined impellor. The laboratory testing operated each blower and furnace combination over a range of air flows and pressure differences to determine air flow performance, power consumption and efficiency. Additional tests varied the clearance between the blower housing and the furnace cabinet, and the routing of air flow into the blower cabinet.

  3. Vettath's blower and blower/mister - a simple device for OPCAB surgery.

    Science.gov (United States)

    Vettath, Murali P; Vellachamy, Kannan A; Talya, Rameshwara; Thazhakuni, Ismail; Moothencheri, Jayaprakash; Thomas, Jiji

    2008-01-01

    Since the advent of off-pump coronary artery bypass surgery, a blower/mister has been routinely used in cardiac operation theatres. In our setup, in an attempt to reduce the cost of coronary artery bypass grafting by performing off-pump coronary artery bypass, reusable materials have been routinely used.

  4. Blower door measurements - extended measuring methods; Blower Door-Messungen - erweiterte Messmethoden

    Energy Technology Data Exchange (ETDEWEB)

    Geissler, A.; Bolender, T.; Hauser, G. [Kassel Univ. (Germany). Fachgebiet Bauphysik

    1997-05-01

    To determine the air tightness of the external envelope, blower door measurements are normally carried out. The thus determined integral figure for the complete structure is an insufficient basis for carrying out specific insulation procedures in existing buildings. Within the scope of the air tightness measurements with the blower door, additional measuring methods permit the determination of additional information on the leakage distribution and the leakage routes. The expanded measuring methods that are known from the bibliography `opening a door` and `adding a hole` as well as the new method of `adding a hole plus` are explained, compared by means of exemplary measurements, and are considered for their suitability during field trials. (orig.) [Deutsch] Zur Bestimmung der Luftdichtheit der Gebaeudehuelle werden im allgemeinen Blower Door-Messungen durchgefuehrt. Der hierbei bestimmte integrale Wert fuer das gesamte Gebaeude stellt fuer das Ergreifen von gezielten Abdichtungsmassnahmen im Gebaeudebestand eine zu geringe Basis dar. Weiterfuehrende Messmethoden erlauben, im Rahmen von Luftdichtheitsmessungen mit der Blower Door zusaetzliche Informationen ueber die Leckageverteilung und ueber Leckagewege zu bestimmen. Die aus der Literatur bekannten erweiterten Messmethoden `Opening A Door` und `Adding A Hole` sowie die neue Methode `Adding A Hole Plus` werden erlaeutert, anhand von exemplarischen Messungen verglichen und im Feldeinsatz auf ihre Anwendbarkeit hin betrachtet. (orig.)

  5. Recent Results on High-Pressure Axial Blowers

    Science.gov (United States)

    Eckert, B.

    1947-01-01

    Considerable progress has, in recent times, been attained in the development of the high-pressure axial blower by well-planned research. The efforts are directed toward improving the efficiencies, which are already high for the axial blower, and in particular the delivery pressure heads. For high pressures multistage arrangements are used. Of fundamental importance is the careful design of all structural parts of the blower that are subject to the effects of the flow. In the present report, several recent results and experiences are reported, which are based on results of German engine research.

  6. Burner blower technology: Adjustable blower with minimum loss and noise; Brennergeblaesetechnik: Regelbares Brennergeblaese mit minimalen Verlusten und Geraeuschen

    Energy Technology Data Exchange (ETDEWEB)

    Kanis, P.G.

    1999-11-01

    The problem of blower control was mentioned in an earlier issue (Waermetechnik 1993, No. 5/6). This contribution presents a novel blower which enables practically loss-free adaptation of the air volume flow and thus helps to save electrical energy and minimize blower noise. [German] In der Waermetechnik 1993, Heft 5 und 6, wurden die Grundlagen der Brennergeblaesetechnik zusammengefasst und dabei auch die Problematik der Geblaeseregelung angesprochen. Im heutigen Beitrag soll ein neues Brennergeblaese vorgestellt werden, welches eine nahezu verlustfreie Anpassung des Luftvolumenstroms an den jeweiligen Bedarf ermoeglicht und dadurch hilft, elektrische Energie einzusparen und die Geblaesegeraeusche zu minimieren. (orig.)

  7. Optimization of repair cycles of VOMD-24 blowers

    Energy Technology Data Exchange (ETDEWEB)

    Kosarev, N.P.; Kuznetsov, S.V. (Sverdlovskii Gornyi Institut (USSR))

    1990-04-01

    Evaluates service life, reliability and repair of VOMD-24 blowers used for ventilation in underground coal mines in the USSR. Depending on operational conditions and ventilation systems, the overhaul life ranges from 7.2 to 14.7 months or 17.7 and 22.5 months (if general overhauls are considered). The mean-time-to repair ranges from 23.3 to 24.0 months, mean-time-to general overhaul from 32.6 to 38.0 months. The average labor consumption of blower repair and of general overhauls is analyzed along with labor consumption of service operations and repair. The recommended and actual standard repair cost, labor consumption and repair intervals are comparatively evaluated. Mathematical models for optimization of repair intervals are evaluated. Use of mathematical modeling for reducing repair cost, increasing blower reliability and reducing losses caused by blower failures is analyzed. 4 refs.

  8. EC motors for blowers; EC-Motoren fuer Luefter

    Energy Technology Data Exchange (ETDEWEB)

    Sauer, Thomas; Reiff, Ellen-Christine

    2009-10-15

    There are highly flexible commercial ventilation and air conditioning systems for server rooms which combine energy savings with optimum room air quality. EC blowers contribute to this and reduce also body sound. (orig./GL)

  9. Soot blower using fuel gas as blowing medium

    Science.gov (United States)

    Tanca, Michael C.

    1982-01-01

    A soot blower assembly (10) for use in combination with a coal gasifier (14). The soot blower assembly is adapted for use in the hot combustible product gas generated in the gasifier as the blowing medium. The soot blower lance (20) and the drive means (30) by which it is moved into and out of the gasifier is housed in a gas tight enclosure (40) which completely surrounds the combination. The interior of the enclosure (40) is pressurized by an inert gas to a pressure level higher than that present in the gasifier so that any combustible product gas leaking from the soot blower lance (20) is forced into the gasifier rather than accumulating within the enclosure.

  10. Vibration and Stability of 3000-hp, Titanium Chemical Process Blower

    Directory of Open Access Journals (Sweden)

    Les Gutzwiller

    2003-01-01

    Full Text Available This 74-in-diameter blower had an overhung rotor design of titanium construction, operating at 50 pounds per square inch gauge in a critical chemical plant process. The shaft was supported by oil-film bearings and was directdriven by a 3000-hp electric motor through a metal disk type of coupling. The operating speed was 1780 rpm. The blower shaft and motor shaft motion was monitored by Bently Nevada proximity probes and a Model 3100 monitoring system.

  11. Optimization of axial blowers. Optimierung von Axial-Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Bolte, W.

    1992-08-01

    For the optimum possible design of axial blowers, trials are evaluated in the article, which are based on the grid profile examined by N. Scholz. The computation for the pressure number and the primary degree of efficiency are shown as well as the evaluation of the effect of the Reynolds and mach number on the degree of efficiency and determination of the secondary losses. In a final example, the dimensions of a blower are computed from the data determined during the trials. (orig.).

  12. Integrated high efficiency blower apparatus for HVAC systems

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Xiaoyue; Weigman, Herman; Wang, Shixiao

    2007-07-24

    An integrated centrifugal blower wheel for a heating, ventilation and air conditioning (HVAC) blower unit includes a first blade support, a second blade support, and a plurality of S-shaped blades disposed between the first and second blade supports, wherein each of the S-shaped blades has a trailing edge bent in a forward direction with respect to a defined direction of rotation of the wheel.

  13. Dynamical system analysis of unstable flow phenomena in centrifugal blower

    Directory of Open Access Journals (Sweden)

    Garcia David

    2015-09-01

    Full Text Available Methods of dynamical system analysis were employed to analyze unsteady phenomena in a centrifugal blower. Pressure signals gathered at different control points were decomposed into their Principal Components (PCs by means of Singular Spectrum Analysis (SSA. Certain number of PCs was considered in the analysis based on their statistical correlation. Projection of the original signal onto its PCs allowed to draw the phase trajectory that clearly separated non-stable blower working conditions from its regular operation.

  14. Furnace Blower Electricity: National and Regional Savings Potential

    Energy Technology Data Exchange (ETDEWEB)

    Florida Solar Energy Center; Franco, Victor; Franco, Victor; Lutz, Jim; Lekov, Alex; Gu, Lixing

    2008-05-16

    Currently, total electricity consumption of furnaces is unregulated, tested at laboratory conditions using the DOE test procedure, and is reported in the GAMA directory as varying from 76 kWh/year to 1,953 kWh/year. Furnace blowers account for about 80percent of the total furnace electricity consumption and are primarily used to distribute warm air throughout the home during furnace operation as well as distribute cold air during air conditioning operation. Yet the furnace test procedure does not provide a means to calculate the electricity consumption during cooling operation or standby, which account for a large fraction of the total electricity consumption. Furthermore, blower electricity consumption is strongly affected by static pressure. Field data shows that static pressure in the house distribution ducts varies widely and that the static pressure used in the test procedure as well as the calculated fan power is not representative of actual field installations. Therefore, accurate determination of the blower electricity consumption is important to address electricity consumption of furnaces and air conditioners. This paper compares the potential regional and national energy savings of two-stage brushless permanent magnet (BPM) blower motors (the blower design option with the most potential savings that is currently available in the market) to single-stage permanent split capacitor (PSC) blower motors (the most common blower design option). Computer models were used to generate the heating and cooling loads for typical homes in 16 different climates which represent houses throughout the United States. The results show that the potential savings of using BPM motors vary by region and house characteristics, and are very strongly tied to improving house distribution ducts. Savings decrease dramatically with increased duct pressure. Cold climate locations will see savings even in the high static pressure duct situations, while warm climate locations will see less

  15. Optimized inflow in radial blowers. Efficient blowers; Optimaler Radeinlauf von Radialventilatoren. Effiziente Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Siepert, Heinz [VENTAPP GmbH und CO. KG, Kempen (Germany)

    2002-05-01

    It is well known that the inflow configuration of radial blowers influences the filling level of the rotor wheel and the rotor blade flow loss significantly. The author shows how losses can be minimized, thus improving the hydraulic efficiency. [German] Schon lange ist bekannt, dass die gewaehlte Radeinlaufkonfiguration bei Radialventilatoren einen grossen Einfluss auf den Fuellungsgrad des Laufrades und somit auch auf die Verluste der Laufschaufelstroemung hat. In der vorliegenden Arbeit wird gezeigt, wie die hydraulischen Radverluste aufgrund dieses Sachverhaltes minimiert und dadurch auch der hydraulische Wirkungsgrad verbessert werden koennen. (orig.)

  16. Noise analysis of ring blowers; Ring blow no soon kaiseki

    Energy Technology Data Exchange (ETDEWEB)

    Ota, S.; Miyazawa, M. [Fuji Electric Co. Ltd., Tokyo (Japan)

    1996-11-10

    The Ring Blower (a commercial product name of a vortex flow blower developed and marketed by Fuji Electric) consists integratedly of a blower, a motor and a silencer. The blower has an impeller attached with 40 to 52 forward-inclined blades, and is small in size capable of outputting high wind pressure. This paper describes the noise analyzing technology used in developing the low-noise Ring Blower, mainly referring to practical applications. A spectral analysis revealed that the noise is composed of rotor blade rotation noise forming several peaks and turbulent noise showing gently-sloping distribution over a wide range of frequency band. Vibration of outer walls of a casing would generate noise which propagates as a sound wave. For such vibration noise as this noise which spreads out into endless space, a BEM analysis is an effective tool. For analyzing flows to optimize blade shapes and analyzing sound pressure distribution in a silencer, an FEM analysis is effective. As a result of applying these technologies, noise has been reduced by over 10 dB from that in conventional products. 2 refs., 12 figs.

  17. 46 CFR 154.1868 - Portable blowers in personnel access openings.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 5 2010-10-01 2010-10-01 false Portable blowers in personnel access openings. 154.1868 Section 154.1868 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS... Portable blowers in personnel access openings. The master shall ensure that a portable blower in...

  18. 42 CFR 84.144 - Hand-operated blower test; minimum requirements.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Hand-operated blower test; minimum requirements. 84... Supplied-Air Respirators § 84.144 Hand-operated blower test; minimum requirements. (a) Hand-operated blowers shall be tested by attaching them to a mechanical drive and operating them 6 to 8 hours daily...

  19. Building America Top Innovations 2013 Profile – High-Performance Furnace Blowers

    Energy Technology Data Exchange (ETDEWEB)

    none,

    2013-09-01

    This Top Innovations profile describes Lawrence Berkeley National Laboratory's work with furnace blower design that led to the creation of a standard for rating blowers, credits for the use of good blowers in Federal tax credit programs and energy codes, and consideration in current federal rulemaking procedures.

  20. 42 CFR 84.145 - Motor-operated blower test; minimum requirements.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Motor-operated blower test; minimum requirements... Supplied-Air Respirators § 84.145 Motor-operated blower test; minimum requirements. (a) Motor-operated... connection between the motor and the blower shall be so constructed that the motor may be disengaged from...

  1. Performance of Air-cooled Engine Cylinders Using Blower Cooling

    Science.gov (United States)

    Schey, Oscar W; Ellerbrock, Herman H , Jr

    1936-01-01

    An investigation was made to obtain information on the minimum quantity of air and power required to cool conventional air cooled cylinders at various operating conditions when using a blower. The results of these tests show that the minimum power required for satisfactory cooling with an overall blower efficiency of 100 percent varied from 2 to 6 percent of the engine power depending on the operating conditions. The shape of the jacket had a large effect on the cylinder temperatures. Increasing the air speed over the front of the cylinder by keeping the greater part of the circumference of the cylinder covered by the jacket reduced the temperatures over the entire cylinder.

  2. The seismic design of axial blower using Ansys

    Energy Technology Data Exchange (ETDEWEB)

    Im, Hyung Bin; Kim, Kang Sung; Heo, Jin Wook; Chung, Jin Tai [Hanyang Univ., Seoul (Korea, Republic of)

    2001-07-01

    The seismic design for an axial blower is the procedure in which the Required Response Spectrum(RRS) is computed by using the Floor Response Spectrum(FRS). The seismic design is very important to reduce severe damages from an earthquake; therefore, the seismic design has been a great concern in engineering society. In this study, after finite element modeling is established by using Ansys, the modal data are obtained such as the natural frequencies, the participation factor, and so on. With these data, the RRS is acquired by a numerical approach. The seismic safety of the axial blower is evaluated.

  3. Performance characteristics of turbo blower in a refuse collecting system according to operation conditions

    Energy Technology Data Exchange (ETDEWEB)

    Jang, C. M.; Kim, D. W. [Korea Institute of Construction Technology, Goyang (Korea, Republic of); Lee, S. Y. [ANST, Seoul (Korea, Republic of)

    2008-10-15

    A simulator for a refuse collecting system is designed to investigate the performance characteristics of a turbo blower operating at different rotational frequencies. The simulator consists of an air intake, a waste chute, circular duct, waste collector and turbo blower. Experimental measurements and numerical simulation with three-dimensional Navier- Stokes equations have been performed to analyze the performance of the turbo blower. Throughout numerical simulation of the simulator, it is found that the input energy of the blower can be reduced by controlling the rotational frequency of impeller while the efficiency of the blower keeps constant. The required outlet pressure and flow rate of the blower can be also adjusted along the system resistance of the refuse collecting system. Detailed flow characteristics inside the blower are analyzed for different rotational frequencies

  4. Energy conservation in cooling systems. Blowers; Energiebesparing in koelsystemen. Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Huijgens, G.

    2009-03-15

    On the role of blowers with regard to the options to save energy with cooling systems. In particular attention is paid to so-called Electronically Commutated (EC) Motors. [Dutch] Over de rol van ventilatoren in de mogelijkheden om energie te besparen met koelsystemen. In het bijzonder wordt aandacht besteed aan de zogenaamde Electronically Commutated (EC) Motors.

  5. Blower-door techniques for measuring interzonal leakage

    Energy Technology Data Exchange (ETDEWEB)

    Hult, Erin L.; Sherman, Max H.; Walker, Iain

    2013-01-01

    Abstract The standard blower door test methods, such as ASTM E779, describe how to use a single blower door to determine the total leakage of a single-zone structure such as a detached single-family home. There are no standard test methods for measuring interzonal leakage in a two-zone or multi-zone building envelope such as might be encountered in with an attached garage or in a multifamily building. Some practitioners have been using techniques that involve making multiple measurements with a single blower door as well as combined measurements using multiple blower doors. Even for just two zones there are dozens of combinations of one-door and two-door test protocols that could conceivably be used to determine the interzonal air tightness. We examined many of these two-zone configurations using both simulation and measured data to estimate the accuracy and precision of each technique for realistic measurement scenarios. We also considered the impact of taking measurements at a single pressure versus over multiple pressures. We compared the various techniques and evaluated them for specific uses. Some techniques work better in one leakage regime; some are more sensitive to wind and other noise; some are more suited to determining only a subset of the leakage values. This paper makes recommendations on which techniques to use or not use for various cases and provides data that could be used to develop future test methods.

  6. Design and Development of a Regenerative Blower for EVA Suit Ventilation

    Science.gov (United States)

    Izenson, Michael G.; Chen, Weibo; Hill, Roger W.; Phillips, Scott D.; Paul, Heather L.

    2011-01-01

    Ventilation subsystems in future space suits require a dedicated ventilation fan. The unique requirements for the ventilation fan - including stringent safety requirements and the ability to increase output to operate in buddy mode - combine to make a regenerative blower an attractive choice. This paper describes progress in the design, development, and testing of a regenerative blower designed to meet requirements for ventilation subsystems in future space suits. We have developed analysis methods for the blower s complex, internal flows and identified impeller geometries that enable significant improvements in blower efficiency. We verified these predictions by test, measuring aerodynamic efficiencies of 45% at operating conditions that correspond to the ventilation fan s design point. We have developed a compact motor/controller to drive the blower efficiently at low rotating speed (4500 rpm). Finally, we have assembled a low-pressure oxygen test loop to demonstrate the blower s reliability under prototypical conditions.

  7. Design and Development of a Regenerative Blower for Space Suit Ventilation

    Science.gov (United States)

    Izenson, Mike; Chen, Weibo; Paul, Heather

    2010-01-01

    The ventilation subsystem in future space suits will require a dedicated ventilation fan. The unique requirements for the ventilation fan, including stringent safety requirements and the ability to increase output to operate in buddy mode, combine to make a regenerative blower an attractive technology choice. This paper describes progress in the design, development, and testing of a regenerative blower designed to meet requirements for a ventilation subsystem for future space suit life support. Analysis methods were developed for the blower s complex internal flows and impeller geometries were identified that enable significant improvements in blower efficiency. Performance predictions were verified by test, measuring aerodynamic efficiencies of 45% at operating conditions that correspond to the ventilation fan s design point. A compact motor/controller was developed to drive the blower efficiently at low rotating speed (4500 rpm). Finally, a low-pressure oxygen test loop was assembled to demonstrate the blower s reliability under prototypical conditions.

  8. Performance Enhancement of Dual-Inlet Centrifugal Blower by Optimal Design of Splitter

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jong Sung; Jang, Choon Man [Korea Institute of Construction Technology, Goyang (Korea, Republic of)

    2014-12-15

    The shape of an impeller splitter for a dual-inlet centrifugal blower was optimized to enhance the blower performance. Two design variable, the normalized chord and pitch of a splitter, were used to evaluate the blower performance and internal flow fields based on the three-dimensional flow analysis. The blower performance obtained using this numerical simulation had a maximum error of 4 percent compared to that in an experiment at the design flow condition. The shape optimization of the splitter successfully increased the blower efficiency and pressure by 3.65 and 1.14 percent compared to the reference values. The blower performance was increased by reducing the flow separation near the blade suction surface by optimizing the shape of the splitter, which produced a pressure increase at the outlet of the volute casing.

  9. Energy savings using medium voltage softstarts on chip blowers

    Energy Technology Data Exchange (ETDEWEB)

    Cooper, J. R. [E. B. Eddy Forest Products, Ltd., Espanola, ON (Canada)

    1997-05-01

    Wood chip blowers are used to pneumatically blow hardwood and softwood chips to storage piles, chip bins and batch digesters. In the past they were allowed to run continuously because it was believed that frequent stops and starts would damage the equipment. Excellent energy paybacks have been achieved with the 1994 installation of silicon controlled rectifier softstarts on the blowers, thus eliminating the cost of running the equipment under no load conditions. Installation and operation of these medium voltage softstarts on both induction and synchronous motors, the project costs and the savings realized, were described. The installation of softstarts is only one example of saving energy in the paper and pulp industry. With advances in silicon controlled rectifier technology , variable speed drives, etc., there are many other opportunities which could be implemented at relatively low cost.

  10. Practically orientated noise laws for blowers. Praxisorientierte Geraeuschgesetze fuer Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Bommes, H.U.; Laoutoumai, D.

    1994-08-01

    The emphasis of the present work is a general noise law for blowers, derived from the strict rules of the simiarity theory, which was first published in 1985. This noise law is of special interest, inasmuch as it implicitly contains a multitude of practical noise laws such as, for example, the oldest noise law from madison or the noise law from Daly, which can easily be attuned to the relevant requirements in practice. (orig.)

  11. Air conditioning and blowers. Special issue; Airconditioning en ventilatoren. Themanummer

    Energy Technology Data Exchange (ETDEWEB)

    Nekeman, H.E. [Multi Import, Rotterdam (Netherlands); Hol, M. [Aircool Klimaattechniek, Ridderkerk (Netherlands); Bassa, E. [ed.

    1997-06-01

    In four articles several aspects of air conditioners and blowers are discussed: the application of the newly developed electronically commutated direct current engine in high-efficiency boilers, air conditioners and cooling systems, the future for flexible synthetic cooling pipes, a description of a Mitsubishi-developed air conditioner: the Inverter Driven Multi-indoor unit, also known as the KX-system, and the importance of the private sector (houses, small businesses, cars) for the use of air conditioning installations. 8 figs.

  12. Centrifugal Blower for Personal Air Ventilation System (PAVS) - Phase 1

    Science.gov (United States)

    2015-02-01

    functionality. 15. SUBJECT TERMS COOLING SBIR REPORTS AXIAL FLOW FANS OFF THE SHELF EQUIPMENT BLOWERS LIGHTWEIGHT CENTRIFUGAL FORCE...HEAT STRESS (PHYSIOLOGY) AIR FLOW VENTILATION PORTABLE EQUIPMENT PERSONAL COOLING SYSTEMS EFFICIENCY EVAPORATION INTEGRATED SYSTEMS PROTOTYPES...gH Vn ad s ad s 4 1 4 3     is angular speed (2rpm) V is volumetric flow rate Had is the fan pumping head (in meters) g is the

  13. Analysis for damages of HPT bearings and generator blower

    Energy Technology Data Exchange (ETDEWEB)

    Gho, W. S.; Kim, G. Y.; Lee, W. G. [Korea Electric Power Research Institute, Taejon (Korea, Republic of)

    2003-10-01

    During normal operation of nuclear turbine-generator, we have found the gap volt increased on the HP turbine bearings. After a week, turbine-generator was tripped due to activating the mechanical overspeed trigger during coast down operation for refueling. On disassembling, we have found the HPT bearings melted and generator blower blades broken. Reviewing the operation and vibration data and damaged components, we have concluded 2{approx}3 blades were broken during transient operation, when generator was vented and filled with CO2 in short time after tripping of turbine-generator due to leaking hydrogen from generator 2 months ago. At this time, the surge or stall through generator blower made reverse force on the rotating blades and made 2{approx}3 blades broken. Blower blades were broken and damaged more during additional transient operation and made rotor current increased due to rubbing of damaged parts. The HPT bearings were corroded electrically and melted down by breaking minimum oil film during speed down operation. The analysis and actions were properly performed and made safe operation of nuclear turbine-generator.

  14. Blowers: Analysis of characteristic fields of swirl-controlled radial blowers; Ventilatoren: Analyse von Kennfeldern drallgesteuerter Radialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Grundmann, R. [I.F.I. Inst. fuer Industrieaerodynamik GmbH, Inst. der Fachhochschule, Aachen (Germany); Bommes, L. [VBI, Korschenbroich (Germany)

    2004-08-01

    Until now, the characteristic fields for different guide blade angles had to be defined experimentally. Characteristic data are derived which enable calculation of the influence of the swirl control unit on the blower characteristic field. (orig.) [German] Das Kennfeld fuer verschiedene Leitschaufelwinkel musste bisher experimentell bestimmt werden. Aus derartig gewonnenen Kennfeldern werden Kenngroessen abgeleitet, die eine rechnerische Abschaetzung des Drallreglereinflusses auf das Ventilatorkennfeld ermoeglichen. (orig.)

  15. Production Facility Prototype Blower Installation Report with 1000 Hour Test Results

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-04-01

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was needed for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is currently being installed at the LANL facility for target and component flow testing. This report describes this blower/motor/pressure vessel package and the status of the facility preparations. The blower has been operated for 1000 hours as a preliminary investigation of long term performance, operation and possible maintenance issues. The blower performed well, with no significant change in blower head or mass flow rate developed under the operating conditions. Upon inspection, some oil had leaked out of the shaft seal of the blower. The shaft seal and bearing race have been replaced. Test results and conclusions are reported.

  16. Production Facility Prototype Blower Installation Report with 1000 Hr Test Results

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Olivas, Eric Richard [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-09-23

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was needed for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is currently being installed at the LANL facility for target and component flow testing. This report describes this blower/motor/pressure vessel package and the status of the facility preparations. The blower has been operated for 1000 hours as a preliminary investigation of long-term performance, operation and possible maintenance issues. The blower performed well, with no significant change in blower head or mass flow rate developed under the operating conditions. Upon inspection, some oil had leaked out of the shaft seal of the blower. The shaft seal and bearing race have been replaced.

  17. Performance and Life Tests of a Regenerative Blower for EVA Suit Ventilation

    Science.gov (United States)

    Izenson, Michael G.; Chen, Weibo; McCormick, John; Paul, Heather L.; Jennings, Mallory A.

    2012-01-01

    Ventilation fans for future space suits must meet demanding performance specifications, satisfy stringent safety requirements for operation in an oxygen atmosphere, and be able to increase output to operate in buddy mode. A regenerative blower is an attractive choice due to its ability to meet these requirements at low operating speed. This paper describes progress in the development and testing of a regenerative blower designed to meet requirements for ventilation subsystems in future space suits. The blower includes a custom-designed motor that has significantly improved its efficiency. We have measured the blower s head/flow performance and power consumption under conditions that simulate both the normal and buddy mode operating points. We have operated the blower for TBD hours and demonstrated safe operation in an oxygen test loop at prototypical pressures. We also demonstrated operation with simulated lunar dust.

  18. Testing the rated parameters of new blowers in the Stara Jama coal mine

    Energy Technology Data Exchange (ETDEWEB)

    Zugic, M.

    1987-04-01

    Presents the findings of a joint commision of specialists from the Mining Institute in Belgrade, the Zenica coal mine and the Korfman company at the trials of two KGL-160 blowers manufactured by Korfman in the FRG. These axial blowers were being offered as replacement for old blower equipment at the Stara Jama coal mine. Describes tests carried out by the commission under various operating conditions and with differing settings of the blower blades. A special note was made of electrical consumption, noise and vibration. Details the mesurement procedures together with the instrumentation used and presents the results in three tables and one diagram. Concludes that both of the blowers tested fully met their design ratings and also complied with all the operational requirements of the Stara Jama mine. 3 refs.

  19. Blower Gun pellet injection system for W7-X

    Energy Technology Data Exchange (ETDEWEB)

    Dibon, M., E-mail: mathias.dibon@ipp.mpg.de [Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching (Germany); Baldzuhn, J.; Beck, M. [Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching (Germany); Cardella, A. [Lehrstuhl für Nukleartechnik, TU Munich, Boltzmannstr. 15, 85748 Garching (Germany); Köchl, F. [Atominstitut, TU Wien, 1020 Vienna (Austria); Kocsis, G. [Wigner RCP, RMI, P.O. Box 49, H-1525 Budapest-114 (Hungary); Lang, P.T. [Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching (Germany); Macian-Juan, R. [Lehrstuhl für Nukleartechnik, TU Munich, Boltzmannstr. 15, 85748 Garching (Germany); Ploeckl, B. [Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching (Germany); Szepesi, T. [Wigner RCP, RMI, P.O. Box 49, H-1525 Budapest-114 (Hungary); Weisbart, W. [Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching (Germany)

    2015-10-15

    Highlights: • Operational principle of the ASDEX Upgrade Blower Gun. • Guiding tube properties for pellet guiding according to the requirements of W7-X. • Diagnostics for the characterization of the injection system. • Experimental procedure to investigate the performance of the Blower Gun. • Results concerning pellet speeds, mass loss, delivery efficiency and exit angle. - Abstract: Foreseen to perform pellet investigations in the new stellarator W7-X, the former ASDEX Upgrade Blower Gun was revised and revitalized. The systems operational characteristics have been surveyed in a test bed. The gun is designed to launch cylindrical pellets with 2 mm diameter and 2 mm length, produced from frozen deuterium D{sub 2}, hydrogen H{sub 2} or a gas mixture consisting of 50% H{sub 2} and 50% D{sub 2}. Pellets are accelerated by a short pulse of pressurized helium propellant gas to velocities in the range of 100–250 m/s. Delivery reliabilities at the launcher exit reach almost unity. The initial pellet mass is reduced to about 50% during the acceleration process. Pellet transfer to the plasma vessel was investigated by a first mock up guiding tube version. Transfer through this S-shaped stainless steel guiding tube (inner diameter 8 mm; length 6 m) containing two 1 m curvature radii was investigated for all pellet types. Tests were performed applying repetition rates from 2 Hz to 50 Hz and propellant gas pressures ranging from 0.1 to 0.6 MPa. For both H{sub 2} and D{sub 2}, low overall delivery efficiencies were observed at slow repetition rates, but stable efficiencies of about 90% above 10 Hz. About 10% of the mass is eroded while flying through the guiding tube. Pellets exit the guiding tube with an angular spread of less than 14°.

  20. Hand injuries from snow blowers: a report of an epidemic.

    Science.gov (United States)

    Tetz, D J; Aghababian, R

    1995-01-01

    During a record snowfall in Worcester, Massachusetts, 11-13 December 1992, 37 male patients with hand injuries suffered during snow blower operation were seen at three area hospitals. Two previous reports describe 13 patients seen over a 3-year period and 28 patients over a 12-year period. This report describes the largest number of hand injuries from snow blowers that have occurred over a 48-hour period. The snow was unusual because of the high water density in the initial 9 inches (23 cm) that fell at an average temperature of 33 degrees F (0.6 degree C) with the final depth of 30 inches (76 cm), causing the machines to become clogged. Patients admitted to reaching into a running machine in 35/37 (95%) cases, 11/37 (30%) claimed the auger and impeller blades were disengaged, and 2/37 (5%) patients claimed their injuries occurred with the engines turned off. All injuries occurred when the patients placed their hands down the chute, contacting the impeller blades. Injuries involved 32 long, 15 ring, 13 index, and five small fingers and ranged from simple lacerations to partial phalangeal amputations. The majority, 27/37 (73%), were managed in emergency departments without interventions in the operating suites. Infection occurred in one patient who had the lesion repaired in the operating suite. As in previous studies, no differences were found for the variables of snow-blower age, type, or horsepower, or on experience level or age of the operators.(ABSTRACT TRUNCATED AT 250 WORDS)

  1. Shaanxi Blower Group: One Brand with Two "China Top Brand"

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ Shaanxi Blower (Group) Co., Ltd.is a group company of large engineering technology and equipment focused on design and manufacturing of turbo-machinery, a large key enterprise in China, one of the top 500 enterprises for machinery industries, one of the best 100 enterprises in income from sales of Chinese Machinery Industries in 2004,one of the largest 1000 group enterprises in China in 2004, one of the vanguard enterprises in Chinese industries in 2005,the key support enterprise aiming at 10billion in production value during the "Eleventh Five-year Plan" by Xi'an Municipal government.

  2. Characteristic estimation of radial blowers; Kennfeldabschaetzung fuer Radialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Draxler, D. [Architekturbuero F. Draxler, Duesseldorf (Germany)

    2002-12-01

    Radial blowers are an important cost factor in space HVAC systems. For cost reduction purposes, designers are interested in a simple, time-saving method of calculating dimensions and characteristics of radial rotors with minimum hydraulic losses. The solution is based primarily on knowledge of the power loss factor. [German] Radialventilatoren verursachen einen hohen Anteil an den laufenden Betriebskosten vieler lufttechnischer Anlagen. Um diese moeglichst gering zu halten, ist der Konstrukteur an einem einfachen und zeitsparenden Entwurfsverfahren interessiert, welches die Bemessungsgroessen und Kennlinien radialer Laufraeder liefert, die minimale hydraulische Verluste aufweisen. Unter diesen Voraussetzungen basiert die Loesung des Problems im Wesentlichen auf der Kenntnis des Minderleistungsfaktors. (orig.)

  3. Shaanxi Blower Group: One Brand with Two "China Top Brand"

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

      Shaanxi Blower (Group) Co., Ltd.is a group company of large engineering technology and equipment focused on design and manufacturing of turbo-machinery, a large key enterprise in China, one of the top 500 enterprises for machinery industries, one of the best 100 enterprises in income from sales of Chinese Machinery Industries in 2004,one of the largest 1000 group enterprises in China in 2004, one of the vanguard enterprises in Chinese industries in 2005,the key support enterprise aiming at 10billion in production value during the "Eleventh Five-year Plan" by Xi'an Municipal government.……

  4. Regenerative blowers for higher pressure ratios; Seitenkanalverdichter fuer erhoehte Druckverhaeltnisse

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachhochschule Merseburg (Germany). Fachbereich Maschinenbau

    1997-10-01

    Up to now regnerative blowers are built and used only for low pressure ratios in the working range of {pi}=1.10 to 1.30 despite of their high pressure coefficients. The small outer dimensions are their essential advantage compared to other flow machines but they are mostly used with low peripheral speed. The reachable stage pressure ratio can be increased by rising the peripheral speed but the expansion flow on the block has to be considered. With regard to the expansion flow on the block two pressure ranges on the block result. The undercritical and the supercritical range of the expansion flow on the block have to be taken into consideration when designing such machines. With a multistage realization of regenerative blowers higher pressure ratios up to {pi}>2.0 are within reach. (orig.) [Deutsch] Bisher werden Seitenkanalverdichter trotz ihrer grossen Druckzahlen nur fuer geringe Druckverhaeltnisse im Auslegungsbereich von {pi}=1,10 bis 1,30 gebaut und betrieben. Ihr wesentlicher Vorteil liegt in den geringen Bauabmessungen im Vergleich zu anderen Stroemungsmaschinen, wobei sie vorwiegend mit geringen Umfangsgeschwindigkeiten betrieben werden. Durch Erhoehung der Umfangsgeschwindigkeit kann das erreichbare Stufendruckverhaeltnis betraechtlich gesteigert werden, wobei aber die Expansionsstroemung im Unterbrecher zu beruecksichtigen ist. Unter Beachtung der Expansionsstroemung im Unterbrecher ergeben sich zwei Druckbereiche fuer die Expansionsstroemung im Unterbrecher. Der unterkritische und der ueberkritische Bereich der Expansionsstroemung im Unterbrecher sind bei der konstruktiven Gestaltung der Maschinen zu beachten. Mit einer mehrstufigen Ausfuehrung von Seitenkanalverdichtern sind hoehere Druckverhaeltnisse bis {pi}>2,0 erreichbar. (orig.)

  5. Towards advanced aeration modelling: from blower to bubbles to bulk.

    Science.gov (United States)

    Amaral, Andreia; Schraa, Oliver; Rieger, Leiv; Gillot, Sylvie; Fayolle, Yannick; Bellandi, Giacomo; Amerlinck, Youri; Mortier, Séverine T F C; Gori, Riccardo; Neves, Ramiro; Nopens, Ingmar

    2017-02-01

    Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow reactors, and empirical correlations are used to describe the impact of operating conditions on bubble formation and transport, and oxygen transfer from the bubbles to the bulk liquid. However, the mechanisms involved are very complex in nature and require significant research efforts. This contribution highlights why and where there is a need for more detail in the different aspects of the aeration system and compiles recent efforts to develop physical models of the entire aeration system (blower, valves, air piping and diffusers), as well as adding rigour to the oxygen transfer efficiency modelling (impact of viscosity, bubble size distribution, shear and hydrodynamics). As a result of these model extensions, more realistic predictions of dissolved oxygen profiles and energy consumption have been achieved. Finally, the current needs for further model development are highlighted.

  6. A realistic dynamic blower energy consumption model for wastewater applications.

    Science.gov (United States)

    Amerlinck, Y; De Keyser, W; Urchegui, G; Nopens, I

    2016-10-01

    At wastewater treatment plants (WWTPs) aeration is the largest energy consumer. This high energy consumption requires an accurate assessment in view of plant optimization. Despite the ever increasing detail in process models, models for energy production still lack detail to enable a global optimization of WWTPs. A new dynamic model for a more accurate prediction of aeration energy costs in activated sludge systems, equipped with submerged air distributing diffusers (producing coarse or fine bubbles) connected via piping to blowers, has been developed and demonstrated. This paper addresses the model structure, its calibration and application to the WWTP of Mekolalde (Spain). The new model proved to give an accurate prediction of the real energy consumption by the blowers and captures the trends better than the constant average power consumption models currently being used. This enhanced prediction of energy peak demand, which dominates the price setting of energy, illustrates that the dynamic model is preferably used in multi-criteria optimization exercises for minimizing the energy consumption.

  7. The advantage of variable speed for multistage centrifugal blowers used in waste-water treatment plants

    Energy Technology Data Exchange (ETDEWEB)

    Huang, X. [Gardner Denver Incorp., Peachtree City, GA (United States)

    1999-07-01

    The multistage centrifugal blower is primarily a 60 Hz market product. A two-pole AC induction motor directly drives the blower at 3600 RPM. These blowers have been used widely for the last three decades in the US for waste water treatment plant applications (WWTP) due to their simple design and rugged construction. The cost of energy drives the market towards not only an efficient single design point but also an efficient operating range when both flow and pressure are varied. On the other hand, if a blower is running at 3000 RPM as in the 50 Hz market, about 20% of flow and 40% of pressure are lost comparing to a 60 Hz application. To meet these new market challenges, the Variable Frequency Drive (VFD) multistage centrifugal blower was designed, where the VFD serves not only as speed adjusting device to maximise the efficiency but also as a speed increaser to minimise the blower size. For existing WWTP installations, retrofit to a VFD drive requires minimum investment and leadtime while achieving drastic energy savings. A comparison with the gear drive high-speed single stage blower concept is also made. (Author)

  8. Uji Performansi Getaran Mekanis dan Kebisingan Mist Blower Yanmar MK 150-B

    Directory of Open Access Journals (Sweden)

    Ahmad Noval Irvani

    2012-10-01

    Full Text Available Mist blower is one of the mechanization tool of agriculture considered as a tool that can assist humans in fertilizer and pesticides spreading activities. Levels of motor speed in the used mist blower were 1915, 4009, and 7227 rpm. Vibration measurements were conducted on the engine and handlebar control mist blower with the three-dimensional axes namely X, Y, and Z. Mist blower noise measurements were performed on the engine, operator's right ear and left ear. Based on the analysis of vibration and noise from the mist blower of type MK 150-B was obtained the safe limit values from the use of these tools. The safe limit of the use of mist blower in motor rotation speed of 1915, 4009, and 7227 rpm after being compared with the vibration and noise were 1 hour, 1 hour and 24 minutes respectively. The farther the distance from noise source, the lower the noise level too. Moreover objectivity study of operator was conducted. The first farmer was tired faster than the second farmer. In terms of age of farmer, the second farmer (60 years older than the first farmers (40 years, but this should not affect significantly. Activity on the previous day greatly affects the level of fatigue when operating the mist blower. This was because the first farmers did more activities and had rest periods that less than second farmer.

  9. Time-frequency analysis of the Surge Onset in the Centrifugal Blower

    Directory of Open Access Journals (Sweden)

    Liskiewicz Grzegorz

    2015-09-01

    Full Text Available Time frequency analysis of the surge onset was performed in the centrifugal blower. A pressure signal was registered at the blower inlet, outlet and three locations at the impeller shroud. The time-frequency scalograms were obtained by means of the Continuous Wavelet Transform (CWT. The blower was found to successively operate in four different conditions: stable working condition, inlet recirculation, transient phase and deep surge. Scalograms revealed different spectral structures of aforementioned phases and suggest possible ways of detecting the surge predecessors.

  10. Operation method of circulation blower of fuel cell power generation system; Nenryo denchi hatsuden sochi no junkan buroa unten hoho

    Energy Technology Data Exchange (ETDEWEB)

    Iida, T. [Fuji Electric Co. Ltd., Tokyo (Japan)

    1998-02-13

    The conventional circulation blower of fuel cell power generation system has such problem as generating a big pressure difference between electrodes. When the blower is started, the pressure difference is caused by sudden start of suction of cell exhaust gas from the upper stream of the circulation blower since the starting is done in total voltage start by switch. When the blower is stopped, the pressure difference is also caused by sudden stop of suction of cell exhaust gas from the upper stream of the circulation blower. In the invention, the motor driving the circulation blower which circulates the cell exhaust gas of fuel cell power generation system to the cell inlet is equipped with a rotation control system (VVVF). When the blower is started, a smooth start of blower, or smooth start of suction of exhaust gas is given by the control system because the rotation speed is gradually increased from low speed. When the blower is stopped, a smooth stop of blower, or smooth stop of suction of exhaust gas is given by the control system because the rotation speed is gradually decreased from high speed to low speed. In this way, the generation of extreme pressure difference between electrodes of fuel cell can be suppressed. 2 figs.

  11. Surge investigations in a radial single-stage blower with adjustable inlet guide vanes

    Energy Technology Data Exchange (ETDEWEB)

    Kryllowicz, W.; Horodko, L.; Hanausek, P.

    1996-12-31

    Experimental investigations of the influence of adjustable inlet guide vanes on the surge propagation in a radial single-stage blower system were carried out. The object of the investigations was a blower with a semi-open impeller with radially ended blades and a vaneless diffuser. The blower maximum pressure rate was {Pi} = 1.52 at the mass flow equal to m = 13.8 kg/s. The test instrumentation used consisted of classic probes and thermocouples and fast response semi-conductor pressure transducers located in flow path walls. Additionally, the noise level for different blower operating points was measured. These investigations made it possible to identify the mild and deep surge regions, the region of an inlet recirculation phenomenon as well as an inlet reverse flow phenomenon in the function of the IGV adjustment angle. (orig.)

  12. Production Facility Prototype Blower Installation Report with 1000 Hr Test Results

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Olivas, Eric Richard [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-09-23

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was need for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is currently being installed at the LANL facility for target and component flow testing. This report describes this blower/motor/pressure vessel package and the status of the facility preparations.

  13. Residential Forced Air System Cabinet Leakage and Blower Performance

    Energy Technology Data Exchange (ETDEWEB)

    Walker, Iain S.; Dickerhoff, Darryl J.; Delp, William W.

    2010-03-01

    This project evaluated the air leakage and electric power consumption of Residential HVAC components, with a particular focus on air leakage of furnace cabinets. Laboratory testing of HVAC components indicated that air leakage can be significant and highly variable from unit to unit ? indicating the need for a standard test method and specifying maximum allowable air leakage in California State energy codes. To further this effort, this project provided technical assistance for the development of a national standard for Residential HVAC equipment air leakage. This standard is being developed by ASHRAE and is called"ASHRAE Standard 193P - Method of test for Determining the Air Leakage Rate of HVAC Equipment". The final part of this project evaluated techniques for measurement of furnace blower power consumption. A draft test procedure for power consumption was developed in collaboration with the Canadian General Standards Board: CSA 823"Performance Standard for air handlers in residential space conditioning systems".

  14. 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)

  15. Experimental optimization of an electric blower by corona wind

    Energy Technology Data Exchange (ETDEWEB)

    Rashkovan, A.; Sher, E.; Kalman, H. [Ben-Gurion University of the Negev, Beer Sheva (Israel). Dept. of Mechanical Engineering

    2002-10-01

    The effect of corona wind produced by stretched steel wire and two copper wings on the heat transfer from a heated horizontal plate was investigated experimentally. Although in such an arrangement the heat transfer augmentation is expected to be lower, some advantages may be postulated. In such a construction, the plate to be cooled is not a part of the wind generation system, it is not charged, the electrical field next to it is negligible, and it may be constructed from non-metallic materials. In the course of the study, optimal geometric parameters of the electric blower together with optimal value of high voltage supply have been established. Under these optimal conditions, augmentation by three times of the heat transfer coefficient over that for the natural convection has been achieved. (author)

  16. Preliminary Tests of Nose- and Side- Entrance Blower Cooling Systems for Radial Engines, Special Report

    Science.gov (United States)

    Biermann, David; Valentine, E. Floyd

    1939-01-01

    Two cowling systems intended to reduce the drag and improve the low-speed cooling characteristics of conventional radial engine cowlings were tested in model form to determine the practicability of the methods. One cowling included a blower mounted on the rear face of a large propeller spinner which drew cooling air in through side entrance ducts located behind the equivalent engine orifice plate. The air was passed through the equivalent engine orifice plate from rear to front and out through a slot between the spinner and the engine plate. The blower produced substantially all the power necessary to circulate the cooling air in some cases, so the quantity of air flowing was independent of the air speed, Two types of blowers were used, a centrifugal type and one using airfoil blades which forced the air outward from the center of rotation. The other cowling was similar to the conventional N.A.C.A. cowling except for the addition of a large propeller spinner nose. The spinner was provided with a hole in the nose to admit cooling air and blower blades to increase the pressure for cooling at low speeds. The tests show that with both cowling types the basic drag of the nacelle was reduced substantially below that for the N.A.C.A. cowling by virtue of the better nose shape made possible by the spinner . The drag due to the side-entrance ducts was nearly zero when the openings were closed or when the blower was drawing in a certain quantity of air in proportion to the air speed. The drag increased, however, when air mas allowed to spill from the openings. The nose-entrance blower showed considerable promise as a cooling means although the blower tested was relatively inefficient, owing to the fact that the blower compartments evidently were expanded too rapidly under the conditions imposed. by the design.

  17. Coronary air embolism in off-pump surgery caused by blower-mister device.

    Science.gov (United States)

    Korkmaz, Askin Ali; Guden, Mustafa; Korkmaz, Feride; Yuce, Murat

    2008-01-01

    Gaseous emboli caused by the blower-mister result in air locks within coronary vessels. We describe the case of a coronary air embolism caused by a blower-mister device on off-pump surgery. The tip of the device unexpectedly entered the coronary artery through arteriotomy and caused the air emboli. Air locks in the coronary circulation led to hemodynamic deterioration, and cardiopulmonary bypass was started following the emergency cannulation.

  18. Design of a Centrifugal Blower for a 400kg Rotary Furnace.

    Directory of Open Access Journals (Sweden)

    Sani Malami Suleiman

    2016-10-01

    Full Text Available Poor performance of a rotary furnace cannot be unconnected to failure in the design of the blower among others, This paper discuss the design of a centrifugal blower for a rotary furnace which will give the required manometric efficiency that will aid adequate combustion as required. The blower was designed to convert ‘driver’ energy to kinetic energy in the fluid by accelerating it to the outer rim of the revolving device known as the impeller. The impeller, driven by the blower shaft adds the velocity component to the fluid by centrifugally casting the fluid away from the impeller vane tips. The amount of energy given to the fluid corresponds to the velocity at the edge or vane tip of the impeller. Significance: Centrifugal blowers are applicable in furnaces such as Rotary and cupola furnace, the efficiency of these furnaces depend on the blast rate and air delivery from a well design blower. This paper will guide to achieve this aims.

  19. Are laptop ventilation-blowers a potential source of nosocomial infections for patients?

    Science.gov (United States)

    Siegmund, Katja; Hübner, Nils; Heidecke, Claus-Dieter; Brandenburg, Ronny; Rackow, Kristian; Benkhai, Hicham; Schnaak, Volker; Below, Harald; Dornquast, Tina; Assadian, Ojan; Kramer, Axel

    2010-09-21

    Inadequately performed hand hygiene and non-disinfected surfaces are two reasons why the keys and mouse-buttons of laptops could be sources of microbial contamination resulting consequently in indirect transmission of potential pathogens and nosocomial infections. Until now the question has not been addressed whether the ventilation-blowers in laptops are actually responsible for the spreading of nosocomial pathogens. Therefore, an investigational experimental model was developed which was capable of differentiating between the microorganisms originating from the external surfaces of the laptop, and from those being blown out via the ventilation-blower duct. Culture samples were taken at the site of the external exhaust vent and temperature controls were collected through the use of a thermo-camera at the site of the blower exhaust vent as well as from surfaces which were directly exposed to the cooling ventilation air projected by the laptop. Control of 20 laptops yielded no evidence of microbial emission originating from the internal compartment following switching-on of the ventilation blower. Cultures obtained at the site of the blower exhaust vent also showed no evidence of nosocomial potential. High internal temperatures on the inner surfaces of the laptops (up to 73°C) as well as those documented at the site of the blower exhaust vent (up to 56°C) might be responsible for these findings.

  20. Disturbances in the afflux of aerodynamically highly stressed axial blowers. Stoerungen in der Zustroemung von aerodynamisch hochbelasteten Axialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Kosyna, G.; Krasmann, H. (Technische Univ. Braunschweig, Pfleiderer-Inst. fuer Stroemungsmaschinen (Germany))

    1992-08-01

    When installing blowers, it is not always possible to ensure an optimum fluidic afflux, which can thus produce a change in the operating behaviour compared with the design. Using as an example an axial blower blade with small hub ratio and high aerodynamic blade load, under simulated non-rotation symmetrical allflux conditions, it was possible to show that with the examined distrubance configuration no extreme worsening was produced with regard to the achievable pressure increases and efficiencies of the blower stage. (orig.).

  1. Blower Gun pellet injection system for W7-X

    Energy Technology Data Exchange (ETDEWEB)

    Dibon, Mathias; Baldzuhn, Juergen; Beck, Michael; Lang, Peter; Ploeckl, Bernhard; Weisbart, Wolfgang [MPI fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching (Germany); Cardella, Antonio; Macian-Juan, Rafael [Lehrstuhl fuer Nukleartechnik, TU Munich, Boltzmannstr. 15, 85748 Garching (Germany); Koechl, Florian [Association EURATOM-OeAW/ATI, Atominstitut, TU Wien, 1020 Vienna (Austria); Kocsis, Gabor; Szepesi, Tamas [Wigner RCP, RMI, EURATOM Association, P.O.Box 49, H-1525 Budapest-114 (Hungary)

    2014-07-01

    Foreseen to serve for the new stellarator W7-X for pellet investigations, the former ASDEX Upgrade Blower Gun was revised and revitalized in a test bed. The gun is able now to launch cylindrical pellets of 2 mm diameter and 2 mm length, produced from frozen Deuterium (D{sub 2}) or Hydrogen (H{sub 2}). Pellets are accelerated by a short pulse of pressurized helium propellant gas to velocities in the range of 100-250 m/s. Delivery reliabilities at the launcher exit close to unity are achieved. For pellet transfer to the plasma vessel a first mock up guiding tube version was investigated. Transfer through this S-shaped (inner diameter 8 mm; length 6 m) stainless steel guiding tube containing two 1 m curvature radii was investigated for both H{sub 2} and D{sub 2} pellets. Tests were performed applying repetition rates from 2 Hz to 50 Hz and propellant gas pressures ranging from 1 bar to 6 bar. For both H{sub 2} and D{sub 2}, low overall delivery efficiencies were observed at slow repetition rates, but stable efficiencies of about 90% above 10 Hz.

  2. Hermatically sealed motor blower unit with stator inside hollow armature

    Science.gov (United States)

    Donelian, Khatchik O.

    1976-01-20

    13. A hermetically sealed motor blower unit comprising, in combination, a sealed housing having a thrust plate mounted therein and having a re-entrant wall forming a central cavity in said housing, a rotor within said housing, said rotor comprising an impeller, a hollow shaft embracing said cavity and a thrust collar adapted to cooperate with said thrust plate to support the axial thrust of said shaft, one or more journal bearings within said housing for supporting the radial load of said shaft and electric motor means for rotating said rotor, said motor means comprising a motor-stator located within said cavity and adapted to cooperate through a portion of said re-entrant wall with a motor-rotor mounted within said hollow shaft, the portion of said re-entrant wall located between said motor-stator and said motor-rotor being made relatively thin to reduce electrical losses, the bearing surfaces of said thrust plate, thrust collar and journal bearings being in communication with the discharge of said impeller, whereby fluid pumped by said impeller can flow directly to said bearing surfaces to lubricate them.

  3. Whistle-blower accuses VA inspector general of a "whitewash"

    Directory of Open Access Journals (Sweden)

    Robbins RA

    2014-09-01

    Full Text Available No abstract available. Article truncated after 150 words. Yesterday, Dr. Sam Foote, the initial whistle-blower at the Phoenix VA, criticized the Department of Veterans Affairs inspector general's (VAOIG report on delays in healthcare at the Phoenix VA at a hearing before the House Committee of Veterans Affairs (1,2. Foote accused the VAOIG of minimizing bad patient outcomes and deliberately confusing readers, downplaying the impact of delayed health care at Phoenix VA facilities. "At its best, this report is a whitewash. At its worst, it is a feeble attempt at a cover-up," said Foote. Foote earlier this year revealed that as many as 40 Phoenix patients died while awaiting care and that the Phoenix VA maintained secret waiting lists while under-reporting patient wait times for appointments. His disclosures triggered the national VA scandal. Richard Griffin, the acting VAOIG, said that nearly 300 patients died while on backlogged wait lists in the Phoenix VA Health Care System, a much higher ...

  4. 42 CFR 84.142 - Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators...

    Science.gov (United States)

    2010-10-01

    ... air blowers; Type A supplied-air respirators; minimum requirements. 84.142 Section 84.142 Public....142 Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators; minimum requirements. (a) Blowers shall be designed and constructed to deliver an adequate amount of...

  5. Speed adjustment of blowers in refrigeration engineering. Exemplary applications; Verfahren der Drehzahlveraenderung von Ventilatoren in der Kaeltetechnik. Beispiel verschiedener Anwendungsfaelle

    Energy Technology Data Exchange (ETDEWEB)

    Albig, J. [Ziehl-Abegg AG, Kuenzelsau (Germany)

    2007-02-15

    Apart from the motor performance, also the investment cost of speed adjustment systems decide the economic efficiency of blowers. The blower performance itself is left out of account in this investigation. The most common control strategies are investigated, i.e. voltage control, frequence control, and EC technology. (orig.)

  6. Four-channel accelerometer for diagnostic testing of roller bearings of mine blowers

    Energy Technology Data Exchange (ETDEWEB)

    Lebiedzki, A.

    1992-01-01

    Discusses design, operation and use of a four-channel vibroacoustic monitoring system for control of the main blowers driven by electric motors with a revolution rate of 500 rpm and 1 MW power. The PPWa-22PN piezoelectric acceleration converters manufactured by the EKCEL plant in Katowice were used. The converters were equipped with built-in preamplifiers that enabled measuring cables up to 100 m long to be used. The converters were mounted on the casings of blower roller bearings. Rising acoustic emission and mechanical vibrations measured and recorded by the system were signalled to a driver by three lamps (green, yellow and red ones) showing acoustic emission increase by 2 dB, 4 dB or 6 dB. Reliability of blower control using the system is discussed. 3 refs.

  7. Blowers in industrial use III. Proceedings; Ventilatoren im industriellen Einsatz III. Tagungsband

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-31

    This VDI Report comprises 36 papers presented at this conference which deal with calculation, design and performance of blowers in industrial use. The proceedings volume addresses engineers and scientists in the research, development and design departments of blower production and plant construction companies. Blower operators, researchers and university teachers may be interested as well. (orig/AKF) [Deutsch] Der VDI Bericht enthaelt 36 Vortraege dieser Tagung, die die Fortschritte auf den Gebieten fer Berechnung, Kostruktion and des Betriebsverhaltens von Ventilatoren fuer verschiedene industrielle Anwendungsfaelle wiedergeben. Der Tagungsband richtet sich an Ingenieure und Wissenschaftler von Unternehmen der Ventilatorherstellung und des Anlagebaus aus den Bereichen Forschung und Entwicklung sowie Konstruktion. Ebenfalls werden damit Betreiber und auf diesem Gebiet taetige Forscher und Hochschullehrer angesprochen. (orig/AKF)

  8. The blower: a useful tool to complete thrombectomy of the mechanical prosthetic valve.

    Science.gov (United States)

    Aroussi, Aziz Alami; Sami, Ibrahim Mohamed; Leguerrier, Alain; Verhoye, Jean Phillippe

    2006-05-01

    Thrombectomy could be an excellent approach on one condition (ie, that all parts of the thrombus are removed). We propose to use a tool (ie, the blower) to complete thrombectomy of the prosthetic mechanical valve. The blower is a vaporizer that mixes air and heparinized saline with regulator of flow and proportion used in beating heart surgery. For thrombectomy, we have modified the air-water mixing part and intensity until we obtained a jet that enabled us to remove the micro thrombus that covered the prosthetic valve and surrounding tissues. The blower completely cleaned the prosthetic valve. With this tool, thrombectomy seems easier, more complete, and more reliable with the advantages of short cross-clamping time.

  9. Effect of diffuser width on rotating stall in centrifugal blower with vaneless diffuser

    Energy Technology Data Exchange (ETDEWEB)

    Kim, J.H. [Small and Medium Industry Promotion Corporation (Korea); Cho, K.R. [Yonsei University, Seoul (Korea)

    2001-10-01

    It is generally known that radial vane blowers with vaneless diffuser may generate mostly only a rotating stall but backward curved vane blowers may do both an impeller and a diffuser rotating stalls. In this study, it was found from the numerical and experimental results that the diffuser rotating stall does not appear in a radial vane because of the suppression for the diffuser stall appearance by occuring of impeller rotating stall in a large flow rate coefficient. The diffuser rotating stalls occurring when the width of diffuser is broaden for a backward curved vane blower are classified definitely by the diffuser flow rate coefficient defined by adopting the varying diffuser width. (author). 12 refs., 9 figs.

  10. OPTIMIZING IMPELLER GEOMETRY FOR PERFORMANCE ENHANCEMENT OF A CENTRIFUGAL BLOWER USING THE TAGUCHI QUALITY CONCEPT

    Directory of Open Access Journals (Sweden)

    R RAGOTH SINGH

    2012-10-01

    Full Text Available As the diffusion of flow process is highly complex in centrifugal blower operation, it is necessary to design / develop the geometry of impeller and casing to reduce the flow losses significantly. In the present study, the methodology to find near optimum combination of blower operating variables for performance enhancement were analyzed using computational fluid dynamics(CFD. Taguchi orthogonal array (OA based design of experiments (DoE technique determines the required experimental trials. The experimental results are justifiedby Analysis of Variance (ANOVA and confirmed by conformation experiments. The parameters chosen for design optimization are Impeller outlet diameter, Impeller wheel width, Thickness of blade and Impeller inlet diameter. The levels for the parametric specification are chosen from the ranges where the blower will get thebest efficiency. CFD results were validated by the fine conformity between the CFD results and the experimental results.

  11. Retrofit device to improve vapor compression cooling system performance by dynamic blower speed modulation

    Science.gov (United States)

    Roth, Robert Paul; Hahn, David C.; Scaringe, Robert P.

    2015-12-08

    A device and method are provided to improve performance of a vapor compression system using a retrofittable control board to start up the vapor compression system with the evaporator blower initially set to a high speed. A baseline evaporator operating temperature with the evaporator blower operating at the high speed is recorded, and then the device detects if a predetermined acceptable change in evaporator temperature has occurred. The evaporator blower speed is reduced from the initially set high speed as long as there is only a negligible change in the measured evaporator temperature and therefore a negligible difference in the compressor's power consumption so as to obtain a net increase in the Coefficient of Performance.

  12. Retrofit device to improve vapor compression cooling system performance by dynamic blower speed modulation

    Energy Technology Data Exchange (ETDEWEB)

    Roth, Robert Paul; Hahn, David C.; Scaringe, Robert P.

    2015-12-08

    A device and method are provided to improve performance of a vapor compression system using a retrofittable control board to start up the vapor compression system with the evaporator blower initially set to a high speed. A baseline evaporator operating temperature with the evaporator blower operating at the high speed is recorded, and then the device detects if a predetermined acceptable change in evaporator temperature has occurred. The evaporator blower speed is reduced from the initially set high speed as long as there is only a negligible change in the measured evaporator temperature and therefore a negligible difference in the compressor's power consumption so as to obtain a net increase in the Coefficient of Performance.

  13. Pulmonary embolism caused by a carbon dioxide blower during off-pump coronary artery bypass grafting.

    Science.gov (United States)

    Hirata, Naoyuki; Kanaya, Noriaki; Yamazaki, Yutaka; Sonoda, Hajime; Namiki, Akiyoshi

    2010-02-01

    We report a rare case of pulmonary embolism (PE) caused by a carbon dioxide (CO2) blower during off-pump coronary artery bypass grafting (OPCAB). When the anastomosis of the right internal thoracic artery to left anterior descending artery was performed, the operator tore the right ventricle outflow track (RVOT) that was adjacent to the left anterior descending artery. Immediately after the anastomosis and repair of the torn RVOT with CO2 blower, the systolic pulmonary artery pressure (PAP) increased from 28 to 64 mmHg, and end-tidal CO2 decreased from 32 to 12 mmHg. Because transesophageal echocardiograph (TEE) showed numerous gas bubbles in the main pulmonary artery, we diagnosed PE caused by invasion of CO2 gas bubbles via the torn RVOT. Although a CO2 blower is useful to enhance visualization of the anastomosis during OPCAB, it should not be used for the venous system because it may cause CO2 embolism.

  14. Using CO to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators

    Directory of Open Access Journals (Sweden)

    Arthur T. Johnson

    2011-01-01

    Full Text Available This experiment was conducted to determine how much contaminant could be expected to be inhaled when overbreathing several different types of respirators. These included several tight-fitting and loose-fitting powered air-purifying respirators (PAPRs and one air-purifying respirator (APR. CO2 was used as a tracer gas in the ambient air, and several loose-and tight-fitting respirators were tested on the head form of a breathing machine. CO2 concentration in the exhaled breath was monitored as well as CO2 concentration in the ambient air. This concentration ratio was able to give a measurement of protection factor, not for the respirator necessarily, but for the wearer. Flow rates in the filter/blower inlet and breathing machine outlet were also monitored, so blower effectiveness (defined as the blower contribution to inhaled air could also be determined. Wearer protection factors were found to range from 1.1 for the Racal AirMate loose-fitting PAPR to infinity for the 3M Hood, 3M Breath-Easy PAPR, and SE 400 breath-responsive PAPR. Inhaled contaminant volumes depended on tidal volume but ranged from 2.02 L to 0 L for the same respirators, respectively. Blower effectiveness was about 1.0 for tight-fitting APRs, 0.18 for the Racal, and greater than 1.0 for two of the loose-fitting PAPRs. With blower effectiveness greater than 1.0, some blower flow during the exhalation phase contributes to the subsequent inhalation. Results from this experiment point to different ways to measure respirator efficacy.

  15. Using CO(2) to determine inhaled contaminant volumes and blower effectiveness in several types of respirators.

    Science.gov (United States)

    Johnson, Arthur T; Koh, Frank C; Scott, William H; Rehak, Timothy E

    2011-01-01

    This experiment was conducted to determine how much contaminant could be expected to be inhaled when overbreathing several different types of respirators. These included several tight-fitting and loose-fitting powered air-purifying respirators (PAPRs) and one air-purifying respirator (APR). CO(2) was used as a tracer gas in the ambient air, and several loose-and tight-fitting respirators were tested on the head form of a breathing machine. CO(2) concentration in the exhaled breath was monitored as well as CO(2) concentration in the ambient air. This concentration ratio was able to give a measurement of protection factor, not for the respirator necessarily, but for the wearer. Flow rates in the filter/blower inlet and breathing machine outlet were also monitored, so blower effectiveness (defined as the blower contribution to inhaled air) could also be determined. Wearer protection factors were found to range from 1.1 for the Racal AirMate loose-fitting PAPR to infinity for the 3M Hood, 3M Breath-Easy PAPR, and SE 400 breath-responsive PAPR. Inhaled contaminant volumes depended on tidal volume but ranged from 2.02  L to 0  L for the same respirators, respectively. Blower effectiveness was about 1.0 for tight-fitting APRs, 0.18 for the Racal, and greater than 1.0 for two of the loose-fitting PAPRs. With blower effectiveness greater than 1.0, some blower flow during the exhalation phase contributes to the subsequent inhalation. Results from this experiment point to different ways to measure respirator efficacy.

  16. Aerosol generation by blower motors as a bias in assessing aerosol penetration into cabin filtration systems.

    Science.gov (United States)

    Heitbrink, William A; Collingwood, Scott

    2005-01-01

    In cabin filtration systems, blower motors pressurize a vehicle cabin with clean filtered air and recirculate air through an air-conditioning evaporator coil and a heater core. The exposure reduction offered by these cabins is evaluated by optical particle counters that measure size-dependent aerosol concentration inside and outside the cabin. The ratio of the inside-to-outside concentration is termed penetration. Blower motors use stationary carbon brushes to transmit an electrical current through a rotating armature that abrades the carbon brushes. This creates airborne dust that may affect experimental evaluations of aerosol penetration. To evaluate the magnitude of these dust emissions, blower motors were placed in a test chamber and operated at 12 and 13.5 volts DC. A vacuum cleaner drew 76 m3/hour (45 cfm) of air through HEPA filters, the test chamber, and through a 5 cm diameter pipe. An optical particle counter drew air through an isokinetic sampling probe and measured the size-dependent particle concentrations from 0.3 to 15 microm. The concentration of blower motor aerosol was between 2 x 10(5) and 1.8 x 10(6) particles/m3. Aerosol penetration into three stationary vehicles, two pesticide application vehicles and one tractor were measured at two conditions: low concentration (outside in the winter) and high concentration (inside repair shops and burning incense sticks used as a supplemental aerosol source). For particles smaller than 1 microm, the in-cabin concentrations can be explained by the blower motor emissions. For particles larger than 1 microm, other aerosol sources, such as resuspended dirt, are present. Aerosol generated by the operation of the blower motor and by other sources can bias the exposure reduction measured by optical particle counters.

  17. Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators

    Science.gov (United States)

    Johnson, Arthur T.; Koh, Frank C.; Scott, William H.; Rehak, Timothy E.

    2011-01-01

    This experiment was conducted to determine how much contaminant could be expected to be inhaled when overbreathing several different types of respirators. These included several tight-fitting and loose-fitting powered air-purifying respirators (PAPRs) and one air-purifying respirator (APR). CO2 was used as a tracer gas in the ambient air, and several loose-and tight-fitting respirators were tested on the head form of a breathing machine. CO2 concentration in the exhaled breath was monitored as well as CO2 concentration in the ambient air. This concentration ratio was able to give a measurement of protection factor, not for the respirator necessarily, but for the wearer. Flow rates in the filter/blower inlet and breathing machine outlet were also monitored, so blower effectiveness (defined as the blower contribution to inhaled air) could also be determined. Wearer protection factors were found to range from 1.1 for the Racal AirMate loose-fitting PAPR to infinity for the 3M Hood, 3M Breath-Easy PAPR, and SE 400 breath-responsive PAPR. Inhaled contaminant volumes depended on tidal volume but ranged from 2.02 L to 0 L for the same respirators, respectively. Blower effectiveness was about 1.0 for tight-fitting APRs, 0.18 for the Racal, and greater than 1.0 for two of the loose-fitting PAPRs. With blower effectiveness greater than 1.0, some blower flow during the exhalation phase contributes to the subsequent inhalation. Results from this experiment point to different ways to measure respirator efficacy. PMID:21792358

  18. Blowers in technical systems - with and without spiral casing; Ventilatoreinsatz in Geraeten - mit oder ohne Spiralgehaeuse

    Energy Technology Data Exchange (ETDEWEB)

    Anschuetz, J. [Gebhardt Ventilatoren, Waldenburg (Germany); Haertel, S. [Gebhardt Ventilatoren, Waldenburg (Germany)

    1996-08-01

    Blowers without casings are used wherever there is little space for installation - in recent years increasingly also in air conditioning systems. This contribution shows how the economic efficiency of the two types of systems can be compared in order to facilitate the choice of blower. (orig.) [Deutsch] In engsten Einbauraeumen ist in einer Vielzahl von Geraeten ein Ventilatorlaufrad ohne Ventilatorgehaeuse zu finden - seit einigen Jahren auch zunehmend in Klimageraeten als Alternative zum herkoemmlichen Spiralgehaeuseventilator. Im folgenden soll verdeutlicht werden, wie diese Konzepte in ihrem physikalischen Wirkungsprinzip, vorranging unter Beruecksichtigung der Wirtschaftlichkeit im Betrieb, verglichen werden koennen, um eine Auswahl zu erleichtern. (orig.)

  19. Characteristics of faces and centrifugal blowers in a system for air distribution control in a mine

    Energy Technology Data Exchange (ETDEWEB)

    Vasilenko, V.I.; Frolov, M.A. (Novocherkasskii Politekhnicheskii Institut (USSR))

    1990-04-01

    Analyzes operation of ventilation systems of underground coal mines on the example of the Rostovugol' mines in the USSR. Systems with types VTs and VTsD main centrifugal blowers are evaluated. Mathematical formulae and functions that characterize ventilation of longwall faces and mining levels are derived and plotted. Static and dynamic characteristics of working faces and the main centrifugal blowers are analyzed. A method for optimization of ventilation systems of underground coal mines is developed; its accuracy was verified on the basis of statistical data from Rostovugol'. 6 refs.

  20. New computer-assisted design of blower convectors; Neue computerunterstuetzte Auslegung von Geblaesekonvektoren

    Energy Technology Data Exchange (ETDEWEB)

    Enzensperger, M. [Axair GmbH, Garching-Hochbrueck (Germany)

    1999-08-01

    The problem is well-known: in the air conditioning market, an increasing trends towards blower convectors has emerged recently. Often the devices are exactly tailored to special applications, requiring accurate rating. The design of blower convectors must correspond to planning specifications. The available technical data deviate from the standard data sheets of manufacturers. (orig.) [German] Wer kennt das Problem nicht: In letzter Zeit ist auf dem Klimamarkt ein verstaerkter Trend zu Geblaesekonvektoren festzustellen. Die Projekte werden oft speziell auf die Anwendungsfaelle zugeschnitten und erfordern eine genauere Auslegung. Gemaess den Angaben eines Planers muss ein Geblaesekonvektor ausgelegt werden. Die vorliegenden technischen Daten weichen von den Standard-Herstellerangaben ab. (orig.)

  1. A constant air flow rate control of blower for residential applications

    Energy Technology Data Exchange (ETDEWEB)

    Yang, S.M. [Tamkang Univ., Taipei (Taiwan, Province of China). Dept. of Mechanical Engineering

    1998-03-01

    This paper presents a technique to control a blower for residential applications at constant air flow rate using an induction motor drive. The control scheme combines a variable volt/hertz ratio inverter drive and an average motor current regulation loop to achieve control of the motor torque-speed characteristics, consequently controlling the air flow rate of the blower which the motor is driving. The controller is simple to implement and practical for commercialization. It is also reliable, since no external pressure or air flow sensor is required. Both a theoretical derivation and an experimental verification for the control scheme are presented in this paper.

  2. Measurements of airtightness of building components using the blower door method - DB Hamm; Bestimmung der Luftdichtheit von einzelnen Gebaeudeteilen mit Hilfe der Blower-Door-Methode - DB Hamm

    Energy Technology Data Exchange (ETDEWEB)

    Heinrich, H.; Dahlem, K.H.; Rechenbach, O.

    2001-08-24

    The blower door measuring system consisted of a variable frame with airtight foil and integrated speed-controlled blower, a volume flow meter and differential pressure manometer. It was not possible in all cases to generate sufficient volume flow for achieving the desired pressure gradient, both in the atrium and the building as a whole. In these cases, only the volume flow for a pressure gradient was measured. The curve was approximated using typical curves, and an n{sub 50} value was extrapolated which is not a real n{sub 50} value but an estimated value based on the values measured for low pressure gradients. Extensive measurements were carried out on different parts of the building.

  3. Experimental study on the aerodynamic performance of 3-dimensional vortex-blowers. Sanjigen uzuryu blower no kuriki seino ni kansuru kenkyu

    Energy Technology Data Exchange (ETDEWEB)

    Yamazaki, S.; Ito, E.; Fujio, M.; Fujita, H. (Hitachi, Ltd., Tokyo (Japan))

    1992-10-25

    Vortex blowers with two-dimensional blades have such deficiencies as low aerodynamic performance and high noise. Accordingly, discussions have been given on effects of three-dimensionalized blades on internal flows and aerodynamic performance with the objective of making the vortex blowers smaller in size, higher in performance, and lower in noise. A spiral flow exists in the flow path in a casing, which has its flow velocity increased as the flow rate is decreased. The flow velocity at the closing point reaches about two times as large as the circumferential speed of the blades in the case of having three-dimensional leading blades. The spiral flow outflowing from outer circumference of the blades into the casing flow path has its flow velocity nearly halved while swirling in semi-circular form in the casing flow path, by which a vortex blower converts the total pressure in the casing flow path to a static pressure. When the outlet angle in the axial direction is changed from 90[degree] (two-dimensional blade) to 50[degree](three-dimensional leading blade), the flow velocity components increase largely in the circumferential direction, with the pressure coefficient and the dynamic coefficient increasing by about two fold respectively. When the inlet angle in the axial direction is reduced to 40[degree] , the blade incident loss reduces, while the pressure coefficient improves by about 20% and the heat insulation efficiency by about 30%. 4 refs., 15 figs., 1 tab.

  4. `CMLe` blower for houses saves 50% energy; Woonhuisventilator CMLe bespaart 50% energie

    Energy Technology Data Exchange (ETDEWEB)

    De Vries, H. [J.E. Stork Ventilatoren, Zwolle (Netherlands)

    1998-01-01

    One of the energy saving techniques to reduce the emission of CO2 is the use of an energy efficient direct current motor in a newly StorkAir developed blower for houses. A brief description of the innovation is given. 1 fig., 2 ills.

  5. Safety and efficiency keys to {open_quotes}surgeless blower{close_quotes}

    Energy Technology Data Exchange (ETDEWEB)

    Banyay, H.D.; Gutzwiller, L.

    1997-01-01

    When exhausting combustible hydrocarbon vapors form sea-going tankers, vapor recovery systems must be spark resistant and gas tight while maintaining stable operation over a wide flow range and minimizing noise, resisting corrosion and providing low maintenance. A {open_quotes}surgeless blower{close_quotes} has met these challenges in 17 US marine vapor emission control systems. The blower, which mounts on a dock, helps move vapors emitted during tanker loading from the tankers through long exhaust ducts to processing plants. The duct-work typically included valves, detonation arresters and other components that increase resistance to gas flow. The volume flow requirement of the exhaust system varies widely depending on the loading rate. A high-pressure blower is therefore needed to allow for a wide range of operating volumes-from 100 CFM to 13,000 CFM-without causing instability or surging. The materials used to construct blowers must be corrosion resistant on inside surfaces to withstand the corrosive effects of hydrocarbon vapor and outside surfaces to operate in the salt-spray environment of seaside docks.

  6. Modification and application of a leaf blower-vac for field sampling of arthropods

    NARCIS (Netherlands)

    Zou, Yi; Telgen, van Mario D.; Chen, Junhui; Xiao, Haijun; Kraker, de Joop; Bianchi, Felix J.J.A.; Werf, van der Wopke

    2016-01-01

    Rice fields host a large diversity of arthropods, but investigating their population dynamics and interactions is challenging. Here we describe the modification and application of a leaf blower-vac for suction sampling of arthropod populations in rice. When used in combination with an enclosure,

  7. Coronary artery surgery without cardiopulmonary bypass: usefulness of the surgical blower-humidifier.

    Science.gov (United States)

    Maddaus, M; Ali, I S; Birnbaum, P L; Panos, A L; Salerno, T A

    1992-12-01

    Coronary artery bypass surgery can be performed without cardiopulmonary bypass (CPB). Bleeding obscuring the operative field and hemodilution of shed blood with irrigating saline are some of the drawbacks of this technique. We report the use of a newly developed surgical blower-humidifier (custom made [Research Medical, Inc.]) for improved visualization and facilitation of coronary artery surgery without CPB.

  8. 42 CFR 84.146 - Method of measuring the power and torque required to operate blowers.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Method of measuring the power and torque required... RESPIRATORY PROTECTIVE DEVICES Supplied-Air Respirators § 84.146 Method of measuring the power and torque... blower, the drum is started in rotation manually at or slightly above the speed at which the...

  9. Machining of the Blower Shroud%静叶片座的加工

    Institute of Scientific and Technical Information of China (English)

    王林锋; 张雪萍

    2013-01-01

    静叶片(导风叶)座为6个弧段拼装而成,其外径达Φ2012 m m,加工后内径为Φ1804 m m,壁厚较薄(最薄厚度仅为20 m m),整个部件重量达到了2.6 T。静叶片装配通过橡胶压缩量进行撑紧,若装配补偿量不足,易导致导风叶松动,影响后续静叶片座的加工。同时,由于静叶片座壁厚较薄,加工易导致变形。文章通过改善静叶片装配与改变静叶片座加工装夹及吊运翻身方式来控制它的变形。%The blower shroud was composed of 6pcs of segment with outside diameter of¢2 012mm and machined inner diameter of¢1 804mm, being a thin wall thickness part (the thinnest thickness was only 20mm) and totaling 2.6T. The blower blade was held tightly depending on the rubber compression in this assembly. In case of that assem-bling compensation was not sufifcient, loosing of the blower blade would occur, thus, influencing the following proce-dure of the machining of the blower shroud. Meanwhile, deformation frequently happened after machining because of the thin wall of the blower shroud. Suggestions were pre-sented in the ifelds of improvement of the blade assembling, clamping way for machining process, machining method and hoisting/turning-over method, to control deformation during process.

  10. Design specifications for explosion protection blowers. Effects of the geometry of a radial blower on its dimensionless characteristics; Entwurfsanforderungen fuer Explosionsschutzventilatoren. Einfluss der geometrischen Konstruktionsgestaltungen eines Radialventilators auf seine dimensionslosen Kennzahlen

    Energy Technology Data Exchange (ETDEWEB)

    Prysok, E. [Forschungs- und Entwicklungszentrum Barowent, Katowice (Poland)

    2003-08-01

    Blowers transporting explosive mixtures of gases and vapours and/or explosive atmospheric dust require special safety measures. The contribution discusses general design principles for explosion protection blowers. [German] Ventilatoren, die zur Foerderung von explosionsfaehigen Gemischen brennbarer Gase und Daempfe sowie explosionsfaehiger Staeube in der Atmosphaere bestimmt sind, benoetigen die Anwendung entsprechender Sicherung fuer ihre Konstruktion. Im folgenden Beitrag werden allgemeine, Explosionsschutzventilatoren betreffende Konstruktionsprinzipien dargestellt. (orig.)

  11. Low flow rates and high air throughput: Cross-flow blowers; Niedrige Stroemungsgeschwindigkeiten bei hohem Luftdurchsatz: Querstromventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Lutz, J. [ebm-papst Landshut GmbH (Germany)

    2006-05-15

    Cross-flow blowers are everywhere, in electric towel driers, heaters, night storage heaters, floor heating systems, and open chimneys. With a diameter of only 30 mm, they are compact and effective. (orig.)

  12. Flow optimization in blowers by means of LDA measurements; Stroemungstechnische Optimierung von Ventilatoren mit Hilfe der LDA-Messtechnik

    Energy Technology Data Exchange (ETDEWEB)

    Reichert, E.; Strehle, M. [ebm Werke GmbH und Co. KG, Mulfingen (Germany); Bohl, K. [Heilbronn Fachhochschule (Germany)

    2003-06-01

    The contribution describes the application of LDA techniques for flow measurements and optimization of blowers. Three examples are presented to show how LDA measurements can be used for optimization and design of industrial blowers. [German] Der Beitrag beschreibt die Anwendung der LDA-Messtechnik fuer die stroemungstechnische Entwicklung und Optimierung von Ventilatoren. An drei Beispielen wird gezeigt, wie im industriellen Einsatz mit LDA-Messungen wesentliche Informationen ermittelt werden koennen, die dann zur Verbesserung oder zur Auslegung von Ventilatoren eingesetzt werden. (orig.)

  13. Measurement and Analysis of the Noise Radiated by Low Mach Number Centrifugal Blowers.

    Science.gov (United States)

    Yeager, David Marvin

    An investigation was performed of the broad band, aerodynamically generated noise in low tip-speed Mach number, centrifugal air moving devices. An interdisciplinary experimental approach was taken which involved investigation of the aerodynamic and acoustic fields, and their mutual relationship. The noise generation process was studied using two experimental vehicles: (1) a scale model of a homologous family of centrifugal blowers typical of those used to cool computer and business equipment, and (2) a single blade from a centrifugal blower impeller placed in a known, controllable flow field. The radiation characteristics of the model blower were investigated by measuring the acoustic intensity distribution near the blower inlet and comparing it with the intensity near the inlet to an axial flow fan. Results showed that the centrifugal blower is a distributed, random noise source, unlike an axial fan which exhibited the effects of a coherent, interacting source distribution. Aerodynamic studies of the flow field in the inlet and at the discharge to the rotating impeller were used to assess the mean flow distribution through the impeller blade channels and to identify regions of excessive turbulence near the rotating blade row. Both circumferential and spanwise mean flow nonuniformities were identified along with a region of increased turbulence just downstream of the scroll cutoff. The fluid incidence angle, normally taken as an indicator of blower performance, was estimated from mean flow data as deviating considerably from an ideal impeller design. An investigation of the noise radiated from the single, isolated airfoil was performed using modern correlation and spectral analysis techniques. Radiation from the single blade in flow was characterized using newly developed expressions for the correlation area and the dipole source strength per unit area, and from the relationship between the blade surface pressure and the incident turbulent flow field. Results

  14. HyBlade sets new standards in axial blowers. Combination of metals and fibre-reinforced plastics; HyBlade setzt neue Massstaebe bei Axialventilatoren. Kombination von Metallen und faserverstaerkten Kunststoffen

    Energy Technology Data Exchange (ETDEWEB)

    Streng, G. [ebm-papst, Mulfingen (Germany)

    2008-03-15

    Motors with external rotors are common as a blower drives as the blower wheel can be mounted directly on the rotor. This simplifies blower construction and makes the blowers comparatively compact. This is an advantage not only in ari conditioning engineering where large blowers are commonly used, e.g. for passing air through heat exchangers. Demands on blowers are ever-increasing, i.e. maximum power, low noise, high efficiency, optimum corrosion protection, low weight, environmentally acceptable production technologies with a favourable energy balance, and - last but not least - an aesthetically pleasing design. (orig.)

  15. Impact of blower performance on residential forced-air heating system performance

    Energy Technology Data Exchange (ETDEWEB)

    Phillips, B.G. [UNIES Ltd., Winnipeg, Manitoba (Canada)

    1998-10-01

    A Canadian association of electric utilities commissioned a study on Blower Efficiency in Domestic Heating Systems because furnace blowers have undesirable load characteristics for electrical utilities; their loads often peak coincident with utility system winter (heating) and summer (air-conditioning) peaks. The study examined air-handling technologies used in domestic furnaces, surveyed residential heating and cooling system installer practices, and measured air-handling performance of 71 existing forced-air heating systems installed between 1960 and 1994. This paper summarizes study findings, including changes in furnace airflows, static pressures, air-handling efficiencies, power requirements, and noise levels. It relates air-handling power requirements and airflows of new furnaces to furnace thermal efficiency.

  16. Boundary model-based reference control of blower cooled high temperature polymer electrolyte membrane fuel cells

    DEFF Research Database (Denmark)

    Jensen, Hans-Christian Becker; Kær, Søren Knudsen

    2011-01-01

    Fuel cells have, by design, a limited effective life time, which depends on how they are operated. The general consent is that operation of the fuel cell at the extreme of the operational range, or operation of the fuel cell without sufficient reactants (a.k.a. starvation), will lower the effective...... life time of a fuel cell significantly. On air cooled HTPEMFCs, the blower, which supplies the fuel cell with oxygen for the chemical process, also functions as the cooling system. This makes the blower bi-functional and as a result a higher supply of oxygen is often available, hence changes...... in the fuel cell output can be optimised by the knowledge of how much oxygen is supplied to the fuel cell at any given time, without reducing the effective life time of a fuel cell by starvation....

  17. Results from installation of waterlance soot blowers at Dairyland Power Cooperative`s JPM station

    Energy Technology Data Exchange (ETDEWEB)

    Hill, D.L. [Dairyland Power Cooperative, La Crosse, WI (United States)

    1995-06-01

    Waterlance soot blowers were installed at the John P. Madgett (JPM) Station in 1992. Improvements in cleaning the furnace and wing wall areas have reduced furnace exit temperature, superheat and reheat sprays, the gas temperature entering the hot side precipitator and NO{sub x} emissions from the Boiler. Overall savings from the waterlances exceeds $11,000,000 in avoided costs and fuel savings. This paper discusses the installation and savings realized from the waterlances at the JPM station.

  18. Study of Jet-Propulsion System Comprising Blower, Burner, and Nozzle

    Science.gov (United States)

    Hall, Eldon W

    1944-01-01

    A study was made of the performance of a jet-propulsion system composed of an engine-driven blower, a combustion chamber, and a discharge nozzle. A simplified analysis is made of this system for the purpose of showing in concise form the effect of the important design variables and operating conditions on jet thrust, thrust horsepower, and fuel consumption. Curves are presented that permit a rapid evaluation of the performance of this system for a range of operating conditions. The performance for an illustrative case of a power plant of the type under consideration id discussed in detail. It is shown that for a given airplane velocity the jet thrust horsepower depends mainly on the blower power and the amount of fuel burned in the jet; the higher the thrust horsepower is for a given blower power, the higher the fuel consumption per thrust horsepower. Within limits the amount of air pumped has only a secondary effect on the thrust horsepower and efficiency. A lower limit on air flow for a given fuel flow occurs where the combustion-chamber temperature becomes excessive on the basis of the strength of the structure. As the air-flow rate is increased, an upper limit is reached where, for a given blower power, fuel-flow rate, and combustion-chamber size, further increase in air flow causes a decrease in power and efficiency. This decrease in power is caused by excessive velocity through the combustion chamber, attended by an excessive pressure drop caused by momentum changes occurring during combustion.

  19. Recognizing and avoiding wrong selections. Blowers in practice; Anwendungsfehler erkennen und vermeiden. Ventilatoren in der Praxis

    Energy Technology Data Exchange (ETDEWEB)

    Pielke, R.

    2002-02-01

    The contribution stresses that blower selection, i.e. design, material, integration in a system, drives and control units, should remain in the hand of experts. [German] Ventilatoren sind Stroemungsmaschinen zur Foerderung von Luft, die wir nicht sehen und fassen koennen. Die auf den Bedarfsfall zugeschnittene, optimale Auswahl eines Ventilators, die Klaerung der Materialfrage, die Einbindung des Ventilators in eine Anlage, die Festlegung des Antriebes sowie die erforderliche Regelung und Steuerung, das alles sind Fragen, die von einem Fachmann zu bearbeiten sind. (orig.)

  20. Blower burner market development. Boiler management by electronics; Ventilatorbrandermarkt in beweging. Elektronica maakt ketelmanagement mogelijk

    Energy Technology Data Exchange (ETDEWEB)

    Harms, R. [Monarch Nederland, Diemen (Netherlands)

    2004-09-01

    A brief overview is given of the developments in the market for blower burners. New technology concerns digital control techniques. [Dutch] De Nederlandse ventilatorbrandermarkt ondergaat de laatste jaren aanzienlijke wijzigingen. 25 jaar geleden trof men tientallen producenten en importeurs van gas-en oliebrandersnaar op een vakbeurs voor verwarming. Nu zijn er nog maar tien. Technische ontwikkelingen spelen zich op dit moment af op het terrein van de digitale besturingstechniek wat extra mogelijkheden biedt.

  1. Modification and Application of a Leaf Blower-vac for Field Sampling of Arthropods

    Science.gov (United States)

    Zou, Yi; van Telgen, Mario D.; Chen, Junhui; Xiao, Haijun; de Kraker, Joop; Bianchi, Felix J. J. A.; van der Werf, Wopke

    2016-01-01

    Rice fields host a large diversity of arthropods, but investigating their population dynamics and interactions is challenging. Here we describe the modification and application of a leaf blower-vac for suction sampling of arthropod populations in rice. When used in combination with an enclosure, application of this sampling device provides absolute estimates of the populations of arthropods as numbers per standardized sampling area. The sampling efficiency depends critically on the sampling duration. In a mature rice crop, a two-minute sampling in an enclosure of 0.13 m2 yields more than 90% of the arthropod population. The device also allows sampling of arthropods dwelling on the water surface or the soil in rice paddies, but it is not suitable for sampling fast flying insects, such as predatory Odonata or larger hymenopterous parasitoids. The modified blower-vac is simple to construct, and cheaper and easier to handle than traditional suction sampling devices, such as D-vac. The low cost makes the modified blower-vac also accessible to researchers in developing countries. PMID:27584040

  2. Modification and Application of a Leaf Blower-vac for Field Sampling of Arthropods.

    Science.gov (United States)

    Zou, Yi; van Telgen, Mario D; Chen, Junhui; Xiao, Haijun; de Kraker, Joop; Bianchi, Felix J J A; van der Werf, Wopke

    2016-08-10

    Rice fields host a large diversity of arthropods, but investigating their population dynamics and interactions is challenging. Here we describe the modification and application of a leaf blower-vac for suction sampling of arthropod populations in rice. When used in combination with an enclosure, application of this sampling device provides absolute estimates of the populations of arthropods as numbers per standardized sampling area. The sampling efficiency depends critically on the sampling duration. In a mature rice crop, a two-minute sampling in an enclosure of 0.13 m(2) yields more than 90% of the arthropod population. The device also allows sampling of arthropods dwelling on the water surface or the soil in rice paddies, but it is not suitable for sampling fast flying insects, such as predatory Odonata or larger hymenopterous parasitoids. The modified blower-vac is simple to construct, and cheaper and easier to handle than traditional suction sampling devices, such as D-vac. The low cost makes the modified blower-vac also accessible to researchers in developing countries.

  3. Numerical Simulation of Unsteady Discharge Flow with Fluctuation in Positive Discharge Blower

    Institute of Scientific and Technical Information of China (English)

    LIU Zhengxian; WANG Dou; XU Lianhuan

    2009-01-01

    The operating performance of positive discharge blower/s markedly influenced by the pulsation of the discharge flow, but difficult to be measured with experimental methods. The internal and discharge flow of positive discharge blower with involute type three-lobe are numerically investigated, both in air cooling and countercurrent cooling conditions by means of computational fluid dynamics (CFD). The unsteady compressible flow equations are solved using RNG κ-ε turbulent model. The finite difference method and the second order upwind difference scheme are applied into discrete equations. In the numerical simulation, the dynamic mesh techniques are used to approach the rotating displacement of cell cubage and the alterability of inlet, outlet flow area. The non-uniform mesh is applied to the rotor-stator coupled area. The reliability of the numerical method is verified by simulating the inner flow and comparing with the semi-empirical theory. The flow flux curves and the distributing of velocity vector showed obvious vortex motion in all the discharge process, both in air cooling and countercurrent cooling conditions. These vortexes with different positions, intension and numbers at different rotating angles have remarkable influences on the discharge flux. For air cooling, the vortex produced a second pulsation with big-amplitude in a cycle, and led to the early appearance of maximum of backflow. For countercurrent cooling, the frequency of pulsation increased due to the pre-inflow, but the hackflow at the outlet is prevented, also the pulsation strength has greatly decreased.

  4. An analytical model to describe the compression in turbomolecular pumps and roots blowers

    Energy Technology Data Exchange (ETDEWEB)

    Voss, G [Oerlikon Leybold Vacuum Bonner Str. 498, D - 50968 Cologne (Germany)], E-mail: gerhard.voss@oerlikon.com

    2008-05-01

    An analytical model is presented, useful in practice, for calculating and analysing the compression curves of classical turbomolecular pumps, wide range turbomolecular pumps and Roots blowers. It is demonstrated that the model, primarily proposed for classical turbomolecular pumps, can be applied to wide range turbomolecular pumps and Roots blowers as well. The model is based on an ordinary differential equation for the pressure as a function of position inside the pump. Solving the differential equation makes it possible both to calculate the compression curves for a finite gas throughput (Q > 0) and for zero gas throughput. A hypothesis is posed holding that the compression curve for zero gas throughput can be derived from a compression curve for a finite gas throughput, e.g., Q = 1 sccm in the case of turbomolecular pumps. In the case of Roots blowers a proposal is made how to describe the backleakage phenomenon quantitatively. For each type of vacuum pump mentioned above the comparison with experimental data shows that the model provides an excellent qualitative and quantitative reproduction of the observed phenomena in the whole relevant pressure range, i.e., perfect agreement over more than five pressure decades is achieved.

  5. Deficiencies in building envelope performance. Quantitative results with blower-door and thermography

    Energy Technology Data Exchange (ETDEWEB)

    Popp, G.; Kalender, V.; Heidt, F.D. [Dept. of Physics, Univ. of Siegen (Germany)

    1996-12-31

    Air-tightness and lack of thermal bridges are indispensable characteristics of low energy houses and passive solar buildings. Although the German heating demand regulation (Waermeschutzverordnung) does not require a verification as yet, only measurements can give the proof of assured quality. Blower doors are well suited to test the air-tightness of buildings and thermographic records can identify and visualize thermal bridges. A new software-tool was developed to evaluate blower door measurements in accordance with the prescriptions of ISO 9972. Further, a new control of pressure differences across blower doors was developed to enable precise air flow measurements through single, small leakages in low-energy buildings by the balanced fan pressurization method. For quantitative analysis of thermographic pictures an evaluation software package was developed including an algorithm to determine lengths and surface areas of objects. Based on various assumptions and boundary conditions it is possible to determine the relative deviations of local U-values from their mean value. Measurements were carried out at 39 buildings of several construction techniques. Typical examples of commonly occuring thermal bridges and air leakages are rolling shutter boxes, window and floor joints as well as wall sockets. The total heat loss through thermal bridges can be reduced by up to 15% - as shown in simulations - with only few constructive measures. (orig.)

  6. Near-fatal methemoglobinemia after recreational inhalation of amyl nitrite aerosolized with a compressed gas blower.

    Science.gov (United States)

    Lin, Chih-Hao; Fang, Cheng-Chung; Lee, Chien-Chang; Ko, Patrick Chow-In; Chen, Wen-Jone

    2005-11-01

    Adverse effects associated with recreational inhalation of nitrites are usually mild and rarely life-threatening. We report a rare case of near-fatal methemoglobinemia after inhalation of amyl nitrite after aerosolizing the liquid using a compressed gas blower designed to clean photographic equipment that employed hydrofluoroalkane-134a as a propellant. A 31-year-old previously healthy male became dyspneic and fainted soon after the recreational inhalation of amyl nitrite aerosolized using a compressed gas blower. He was brought to the emergency department with severe cyanotic appearance and profound shock. Oxygen saturation was 82%, unresponsive to oxygen supply. His methemoglobin blood level was 52.2%. After 100 mg of methylene blue (2 mg/kg body weight) was administered intravenously, he recovered consciousness, and dyspnea and cyanosis subsided gradually. This case illustrates the extraordinary hazard of the use of a compressed gas blower in the recreational inhalation of nitrites. Prompt recognition and rapid antidotal treatment may adequately correct near-fatal overdose associated with recreational use of amyl nitrite.

  7. Preventing resonance problems in speed-controlled blowers. Destruction of the blower-motor unit may result; Resonanzprobleme drehzahlgeregelter Ventilatoren vermeiden. Zerstoerung der Ventilator-Motoreinheit nicht ausgeschlossen

    Energy Technology Data Exchange (ETDEWEB)

    Lexis, J.

    2004-05-01

    The economic efficiency of a ventilation depends not least on the ease with which air volumes can be adapted to changing operating conditions. Speed control is the most common method, but undesired resonance phenomena may occur in certain operating conditions. This must be prevented at all cost as resonances will cause noise problems and may even destroy the blower-motor unit. (orig.) [German] Die Wirtschaftlichkeit einer lufttechnischen Anlage wird entscheidend dadurch bestimmt, wie gut oder wie schlecht sich die Anpassung der Luftmengen an veraenderte Betriebssituationen realisieren laesst. Die am haeufigsten verwendete Methode ist die Drehzahlregelung des Ventilators. Dabei kann es unter bestimmten Betriebsbedingungen zu unerwuenschten Resonanzerscheinungen kommen. Der Betrieb eines Ventilators in diesem Bereich ist aber auf keinen Fall zulaessig, denn Resonanzen koennen zu Geraeuschproblemen und zur Zerstoerung der Ventilator-Motoreinheit fuehren. (orig.)

  8. A method of forecasting wide band noise in axial blowers. Part 2; Prognoseverfahren fuer den Breitbandlaerm bei Axialventilatoren. Teil 2

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, M.; Carolus, T. [Siegen Univ. (Germany). Inst. fuer Fluid- und Thermodynamik

    2003-05-01

    Apart from the aerodynamic data of blowers, their acoustic properties are gaining importance. In industrial practice, blower noise is commonly estimated by very simple methods which only take account of very basic machine parameters. On the other hand, many semi-empirical models have been published for calculating blower noise which require more detailed input parameters, e.g. the velocity field around the blades, boundary layer parameters, etc. These models promise to be more accurate than the simple methods. [German] Neben den aerodynamischen Daten gewinnt die Schallleistung von Ventilatoren in zunehmendem Masse an Bedeutung. In der industriellen Praxis wird das Ventilatorgeraeusch bislang mit sehr einfachen Verfahren abgeschaetzt, die nur grundlegende Maschinengroessen beruecksichtigen. In der Literatur findet man allerdings eine Vielzahl semi-empirischer Modelle fuer die Schallleistungsberechnung von Ventilatoren, die detailliertere Eingangsparameter wie das Geschwindigkeitsfeld um die Schaufeln, Grenzschichtparameter usw. erfordern. Diese Modelle versprechen eine bessere Schallprognose als die einfachen Verfahren. (orig.)

  9. Theoretical model with experimental validation of a regenerative blower for hydrogen recirculation in a PEM fuel cell system

    Energy Technology Data Exchange (ETDEWEB)

    Badami, M.; Mura, M. [Dipartimento di Energetica, Politecnico di Torino, C.so Duca degli Abruzzi 24, Torino (Italy)

    2010-03-15

    A theoretical model of a regenerative blower used for the hydrogen recirculation of a Proton Exchange Membrane (PEM) fuel cell (FC) for automotive applications has been implemented and validated by means of experimental data. A momentum exchange theory was used to determine the head-flow rate curves, whereas the circulatory flow rate was determined through a theory based on the consideration of the centrifugal force field in the side channel and in the impeller vane grooves. The model allows a good forecast to be made of the blower behaviour, and only needs its main geometrical characteristics and some fluid-dynamic data as input. For this reason, the model could be very interesting, especially during the first sizing and the design activity of the blower. (author)

  10. Intermediate blades in slow radial blowers. Final report; Zwischenschaufeln - Zwischenschaufeln in langsamlaeufigen Radialventilatoren. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Carolus, T.; Basile, R.

    2001-05-01

    The effects of intermediate blades on the aerodynamic characteristics of slow radial blowers was investigated. It was found that the installation of intermediate blades of optimized design will slightly raise the pressure coefficients at comparable performance, especially if the initial number of blades was low. Stall will be reduced as well. On the basis of extensive investigations, a design diagram was drawn up which enables producers of blowers to assess the optimal intermediate blade configuration for a given blower quickly and easily. (orig.) [German] Der Einfluss von Zwischenschaufeln auf die aerodynamischen Kennwerte langsamlaeufiger Radialventilatorlaufraeder mit rueckwaertsgekruemmten Schaufeln wurde untersucht. Als Einflussparameter wurden die Hauptschaufelzahl, der Schaufelwinkel, das Breitenverhaeltnis, das Durchmesserverhaeltnis und die Zwischenschaufellaenge und -position in Betracht gezogen. Um eine moeglichst umfassende Bewertung dieser Zwischenschaufeln zu erhalten, wurden fuer eine Vielzahl von Parameterkombinationen die Stromfelder numerisch berechnet und daraus die aerodynamischen Kennwerte ermittelt. Dazu wurden zunaechst verschiedene Rechenverfahren und Rechenraumgrenzen untersucht und anhand von Messungen und Plausibilitaetsbetrachtungen bewertet. Als taugliches Rechenverfahren erwies sich ein dreidimensionales Navier-Stokes-Verfahren mit einem Rechenraum, der Einlaufduese, Radialspalt, Saugmund und Schaufelkanal umfasst. Die Ergebnisse systematischer Variationen der Einflussparameter zeigen, dass die aerodynamischen Kennwerte von allen oben genannten Parametern abhaengen. Der Einbau optimal ausgefuehrter Zwischenschaufeln in ein Ausgangsrad ohne Zwischenschaufeln fuehrt zu einer - wenn auch moderaten - Steigerung der Druckzahlen bei vergleichbaren Wirkungsgraden, insbesondere bei niedriger Hauptschaufelzahl des Ausgangsrades. Eine Minderung der Versperrung (d.h. eine Reduktion der Volumenzahl) ist mit Zwischenschaufeln moeglich. Mit den

  11. Gas blower for use in potentially explosive atmosphere; Ventilatoren fuer den Einsatz in explosionsgefaehrdeten Bereichen

    Energy Technology Data Exchange (ETDEWEB)

    Frobese, D.-H.; Waldmann, R.

    1996-12-31

    The extension of emission control requirements during the last years lead to an increasing demand for blowers suited for the transport of explosive waste gas. Concerning hazardous explosive atmosphere which is classified as zone 1 or zone 2, the ``VDMA-Einheitsblaetter`` give guidance to appropriate constructional requirements for blowers. However, for zone 0-applications, there do not exist fixed construction requirements up til now. In the range of validity of the ``Verordnung fuer brennbare Fluessigkeiten - VbF`` a type approval is requested for blowers to be used for zone 0. Equipment intended for use in potentially explosive atmospheres will fall under the new Directive 94/9/EC (explosion protection directive) in future; equipment to be used for zone 0 will need an EC-type-examination certificate which shall be issued by a notified body in accordance to the Directive. (orig.) [Deutsch] Die zunehmende Erfassung von Anlagen durch emissionsrechtliche Anforderungen hat in den letzten Jahren zu einem immer groesseren Bedarf an Ventilatoren zur Foerderung von explosionsfaehiger Abluft gefuehrt. Fuer den Einsatz in explosionsgefaehrdeten Bereichen der Zonen 1 und 2 gelten VDMA-Einheitsblaetter, nach denen Ventilatoren konstruiert werden koennen; fuer den Einsatz im Bereich der Zone 0 hingegen existieren bislang keine festgelegten Konstruktionsanforderungen. Im Geltungsbereich der Verordnung ueber brennbare Fluessigkeiten (VbF) wird fuer den Einsatz in Zone 0 eine Bauartzulassung gefordert. Zukuenftig unterliegen Geraete, die in explosionsgefaehrdeten Bereichen eingesetzt werden, der neuen EG-Richtlinie 94/9/EG (Explosionsschutzrichtlinie), wonach fuer Geraete, die in Zone 0 eingesetzt werden, eine Baumusterpruefbescheinigung einer benannten Zertifizierstelle erforderlich ist. (orig.)

  12. Use of EC-blowers contribute to green investment; Gebruik van EC-ventilatoren levert bijdrage aan groene investering

    Energy Technology Data Exchange (ETDEWEB)

    Huijgens, G.; Ridder, A.

    2009-07-01

    Despite their small share in the entire use, applying EC blowers (electronically commutated) in coolers and condensers can provide an interesting contribution to a sound green investment. This additional investment with EC blowers will pay off through more efficient energy use and easy operation with rpm control. [Dutch] Door gebruik te maken van EC-ventilatoren (EC staat voor 'electronically commutated') op koelers en condensors kan, ondanks het kleine aandeel in het totaalverbruik, toch een interessante bijdrage geleverd worden aan een verantwoorde groene investering. Deze meerinvestering met EC-ventilatoren betaalt zich uit in zuinig energieverbruik en eenvoudige aansturing met toerenregeling.

  13. 罗茨鼓风机设计结构探讨%Discussion of Design Construction for Roots Blower

    Institute of Scientific and Technical Information of China (English)

    冯育棠; 杨光; 李文英

    2001-01-01

    Comparative discussion is done for the design construction of various types of Roots blowers.Advantages & shortcomings are pointed out.The constructive feature of series SL three lobe Roots blower is mainly introduced.%对各种类型的罗茨鼓风机的设计结构做了对比性的探讨,指出了其优缺点。重点介绍了SL系列三叶罗茨鼓风机的结构特点。

  14. In-cylinder gas velocity measurements comparing crankcase and blower scavenging in a fired two-stroke cycle engine

    Science.gov (United States)

    Miles, P. C.; Green, R. M.; Witze, P. O.

    1994-01-01

    The in-cylinder flow field of a Schnuerle (loop) scavenged two-stroke engine has been examined under conditions simulating both blower and crankcase driven scavenging. Measurements of the radial component of velocity were obtained along the cylinder centerline during fired operation at delivery ratios of 0.4, 0.6, and 0.8. Both mean velocity profiles and root mean square velocity fluctuations near top center show a strong dependence on the scavenging method. Complementary in-cylinder pressure measurements indicate that combustion performance is better under blower driven scavenging for the engine geometry studied.

  15. When Whistle-blowers Become the Story: The Problem of the ‘Third Victim’

    Science.gov (United States)

    Waring, Justin

    2016-01-01

    In the healthcare context, whistleblowing has come to the fore of political, professional and public attention in the wake of major service scandals and mounting evidence of the routine threats to safety that patients face in their care. This paper offers a commentary and wider contextualisation of Mannion and Davies, ‘Cultures of silence and cultures of voice: the role of whistleblowing in healthcare organisations.’ It argues that closer attention is needed to the way in which whistle-blowers can become the focus and victim of raising concerns and speaking up. PMID:26927403

  16. Damage to soot blowers in a high-dust DENOX plant

    Energy Technology Data Exchange (ETDEWEB)

    Bolte, C.; Farwick, H. (STEAG-RWE OHG, Voerde (Germany). Voerde Power Plant)

    1993-06-01

    The two 710 MW Units A and B at Voerde are equipped with selective catalytic reduction reactors in the high dust range. Following commissioning of the DENOX plant, the prescribed soot blowing conditions were proven to be adequate. About nine months later, the first operating problems occurred on the soot blowers and these intensified in the course of time. Following the failure of several steam supply pipes, the soot blowing then had to be adjusted to two-way since leaky blast valves became permeable to the condensate and dampening of the catalyser had to be feared. 2 refs., 9 figs.

  17. The blower characteristic. What information does it provide?; Die Ventilator-Kennlinie. Welche Informationen bietet sie?

    Energy Technology Data Exchange (ETDEWEB)

    Lexis, J.

    2002-05-01

    The blower characteristic as a rule is difficult to interpret. The contribution therefore discusses how it should be read and what information can be derived. It also goes into the influence of pressure changes on the operating point. [German] Die Kennliniendarstellung von Ventilatoren zeigt in der Regel eine verwirrende Fuelle von Linien, Kurven und Skalenstaeben, deren Bedeutung und Information zum gewaehlten Betriebspunkt nicht immer auf Anhieb erkennbar wird. Im folgenden soll daher einmal ausfuehrlich und detailliert auf die Informationen, die ein Kennlinienfeld bietet, eingegangen werden. Des weiteren werden die Betriebspunktaenderungen infolge von Druckverschiebungen erlaeutert. (orig.)

  18. Room acoustic analysis of blower unit and noise control plan in the typical steel industry

    Directory of Open Access Journals (Sweden)

    2013-02-01

    Full Text Available Introduction: In the steel industry,air blowers used to supply compressed air are considered as sources of annoying noise. This study aims to acoustics analysis of theairblower workroomand sound source characteristics in order to present noise controlmeasuresinthe steel industry. .Material and Method: Measurement of noiselevel and its frequency analysis was performed usingsound levelmetermodelof CASELLA-Cell.450. Distribution of noise level in the investigated workroom in form of noise map was provided using Surfer software. In addition, acoustic analysis of workroom and control room was performed in view point of soundabsorption andinsulation. Redesignofdoor and window of controlroom and installation of soundabsorbing materialson theceiling of the workroom were proposed and the efficiency of these interventionswasestimated. .Result: The totalsound pressurelevelin the blower workroom was 95.4 dB(L and the dominant frequency was 2000Hz. Sound pressure level inside the room control was 80.1dB(A. The average absorption coefficient and reverberation time in the blower workroom was estimated equal to 0.082 Sab.m2 and 3.9 seconds respectively. These value in control room was 0.04 Sab.m2 and 3/4 seconds respectively. In control room, sound transmission loss between the two parts of the wall dividing was 13.7 dB(A. The average of noise dose in blower operators was 230%. With the installation of sound absorber on ceiling of workroom, average of absorption coefficient can increase to 0.33 Sab.m2 and sound transmission loss of the new designed door and window was estimated equal to 20dB. . Conclusion: The main cause of noise leakage in the control room was insufficient insulation properties of door and windows. By replacing the door and window and installation of sound absorbing on ceiling of workroom, the noise dose can reduce to 49.6%. New Improved door and window of control room can reduce noise dose to 69.65% solely.

  19. Blower door measurements. Guide 'Airtightness-testing' for house owners and planners; Blower-Door-Messung. Leitfaden 'Gebaeudedichtigkeits-Pruefung' fuer Bauherren und Planer. Fachtext 3.4. Maerz 2003

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-03-01

    To determine the air tightness of the external envelope, blower door measurements are normally carried out. The thus determined integral figure for the complete structure is an insufficient basis for carrying out specific insulation procedures in existing buildings. Within the scope of the air tightness measurements with the blower door, additional measuring methods permit the determination of additional information on the leakage distribution and the leakage routes. The expanded measuring methods that are known from the bibliography 'opening a door' and 'adding a hole' as well as the new method of 'adding a hole plus' are explained, compared by means of exemplary measurements, and are considered for their suitability during field trials. [German] Zur Bestimmung der Luftdichtheit der Gebaeudehuelle werden im allgemeinen Blower Door-Messungen durchgefuehrt. Der hierbei bestimmte integrale Wert fuer das gesamte Gebaeude stellt fuer das Ergreifen von gezielten Abdichtungsmassnahmen im Gebaeudebestand eine zu geringe Basis dar. Weiterfuehrende Messmethoden erlauben, im Rahmen von Luftdichtheitsmessungen mit der Blower Door zusaetzliche Informationen ueber die Leckageverteilung und ueber Leckagewege zu bestimmen. Die aus der Literatur bekannten erweiterten Messmethoden 'Opening A Door' und 'Adding A Hole' sowie die neue Methode 'Adding A Hole Plus' werden erlaeutert, anhand von exemplarischen Messungen verglichen und im Feldeinsatz auf ihre Anwendbarkeit hin betrachtet.

  20. Blower door measurement. Guide 'Airtightness-testing' for house owners and planners; Blower-Door-Messung. Leitfaden 'Gebaeudedichtigkeits-Pruefung' fuer Bauherren und Planer. Fachtext 3.4

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-08-15

    The blower door is a simple to use measuring device for determining the seal of the external surfaces of buildings. The accuracy of the measurement is dependent to a considerable extent on the external climatic conditions that prevail at the time of taking the measurement. (orig.)

  1. Blower door measurements. Guide 'Airtightness-testing' for house owners and planners; Blower-Door-Messung. Leitfaden 'Gebaeudedichtigkeits-Pruefung' fuer Bauherren und Planer. Fachtext 3.4. Mai 2006

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-05-15

    The blower door is a simple to use measuring device for determining the seal of the external surfaces of buildings. The accuracy of the measurement is dependent to a considerable extent on the external climatic conditions that prevail at the time of taking the measurement. (GL)

  2. A robust and quick method for the estimation of long-term average indoor radon concentrations (extended Blower-Door method); Ein robustes und schnelles Verfahren zur Abschaetzung der langzeitlich mittleren Radonkonzentration in einem Gebaeude (erweiterte Blower-Door-Methode)

    Energy Technology Data Exchange (ETDEWEB)

    Maringer, F.J. [Bundesversuchs- und Forschungsanstalt Arsenal, Vienna (Austria); Akis, M.C.; Stadtmann, H. [Oesterreichisches Forschungszentrum Seibersdorf GmbH (Austria); Kaineder, H. [Amt der Oberoesterreichischen Landesregierung, Linz (Austria); Kindl, P. [Technische Univ., Graz (Austria); Kralik, C. [Bundesanstalt fuer Lebensmitteluntersuchung und -forschung, Vienna (Austria); Lettner, H.; Winkler, R. [Salzburg Univ. (Austria); Ringer, W. [Salzburg Univ. (Austria)]|[Atominstitut der Oesterreichischen Universitaeten, Vienna (Austria)

    1998-12-31

    Within the Austrian radon mitigation project `SARAH` different methods of radon diagnosis had been used. For these investigations a `Blower-Door` had been employed to apply a low pressure and to look for radon entry paths. On the occasion of the radon sniffing the team got the idea to measure the radon concentration in the Blower-Door exhaust air to get an estimate of the long-term average radon concentration in the building. In this paper the new method and their application possibilities are given. The estimation of the average radon entry rate, the average long-term radon concentration, and the evaluation of the mitigation success are described and discussed. The advantage of this procedure is to obtain a result for the annual mean indoor radon concentration after only about three hours. (orig.) [Deutsch] Im Rahmen des oesterreichischen Radonsanierungsprojekts `SARAH` wurden verschiedene Methoden zur Radondiagnose von Gebaeuden angewandt. Zum raschen Auffinden von Radoneintrittspfaden wurde auch ein `Blower-Door` zur Applikation eines Unterdrucks (-50 Pa) innerhalb der untersuchten Haeuser verwendet. Dabei entsprang die Idee, durch Messung der Radonkonzentration der Blower-Door-Abluft einen Hinweis auf die durchschnittliche Radonkonzentration im Gebaeude zu erhalten. In dieser Arbeit werden die neue Methode und deren Anwendungsmoeglichkeit zur Abschaetzung der mittleren Radoneintrittsrate und der langzeitlich mittleren Radonkonzentrationen (`Jahresmittelwert`) sowie des Sanierungserfolges (Ausmass der Radonreduktion) eines Gebaeudes beschrieben und diskutiert. Der Vorteil der Methode liegt darin, dass innerhalb von etwa drei Stunden Messzeit eine Abschaetzung fuer den Jahresmittelwert der Radonkonzentration eines Gebaeudes vorliegt. (orig.)

  3. Pumice in the interglacial Whidbey Formation at Blowers Bluff, central Whidbey Island, WA, USA

    Science.gov (United States)

    Dethier, D.P.; Dragovich, J.D.; Sarna-Wojcicki, A. M.; Fleck, R.J.

    2008-01-01

    A new 40Ar/39Ar age of 128??9 ka and chemical analyses of pumice layers from interglacial alluvium at Blowers Bluff, Whidbey Island, WA, show that the deposits are part of the Whidbey Formation, a widespread, mainly subsurface unit. Glass chemistry of the dated dacitic pumice does not match any analyzed northern Cascade source, but upper Pleistocene dacites from Glacier Peak and early Pleistocene silicic rocks from the Kulshan caldera are chemically similar. The chemistry of pumiceous dacite in younger units, including the latest Pleistocene Partridge Gravel, is similar to that of the dated material. The deep troughs of the modern northern Puget lowland must have been filled during deposition of the Whidbey Formation, allowing volcanic-rich sediment to reach what is now Whidbey Island. Topographic analysis of LIDAR images demonstrates that extensive erosion occurred during latest Pleistocene ice retreat. The Partridge Gravel likely records subglacial fluvial erosion along an ice tunnel and ice-marginal deposition into adjacent marine waters. Pumice in the Partridge Gravel probably was reworked from stratigraphically and topographically lower deposits, including those at Blowers Bluff. ?? 2007 Elsevier Ltd and INQUA.

  4. Design of the working channel for regenerative blowers; Dimensionierung des Arbeitskanals von Seitenkanalverdichtern

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany); Galinsky, H. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany)

    1996-04-01

    Regenerative blowers were built for pressure ratios from 1.2 to 1.5. They are used in many industrial areas for the compression of air and technical gases. They are also used as a compressor for coarse vacuum in the paper and polygraphic industrie. The design of the blower, especially the side channel, was done for incompression flow with a constant cross section of the side channel over all of the perimeter. The accessible pressure ratios make it necessary, to consider the alternation of the density by the designing of the machine and to have optimal flow in the side channel over all of the perimeter. In this article was shown the designing calculation for the cross section dependent on the peripheral angle and the most important quantities for the calculation given. (orig.) [Deutsch] Seitenkanalverdichter werden fuer Druckverhaeltnisse von {pi}=1,2 bis 1,5 gebaut und in vielen Industriebereichen zur Verdichtung von Luft und technischen Gasen sowie als Verdichter im Grobvakuumbereich in der Papier- und polygraphischen Industrie eingesetzt. Die Auslegung der Verdichter, insbesondere des Seitenkanals erfolgt bisher fuer inkompressible Stroemung mit konstantem Querschnitt im gesamten Umfangsbereich. Die angestrebten Druckverhaeltnisse zwingen jedoch dazu, die Dichteaenderung im Seitenkanal bei der Auslegung zu beruecksichtigen, wenn optimale Stroemungsverhaeltnisse im gesamten Seitenkanal angestrebt werden. Die Auslegungsrechnung mit dem Querschnittsverlauf des Seitenkanals in Abhaengigkeit des Umfangswinkels werden dargestellt und die wichtigsten Einflussgroessen fuer die Berechnung angegeben. (orig.)

  5. Explosion-protected blowers for removing explosive atmospheres from zone 0; Explosionsgeschuetzte Ventilatoren fuer die Foerderung von explosionsfaehiger Atmosphaere aus Zone 0

    Energy Technology Data Exchange (ETDEWEB)

    Frobese, D.H. [Physikalisch-Technische Bundesanstalt (PTB), Braunschweig (Germany)

    2006-09-15

    Blowers for use in areas with high explosion hazards and/or for removal of explosive fluids are subject to directive 94/9/EG and must be explosion-protected according to Appendix II of that directive. So far, Germany only had VDMA specification leaflet 24169, which lists requirements on blowers for use in zones 1, 2, or 11. In the meantime, prEN 14986 has been elaborated which lists speciications for construction and testing of explosion-protected blowers. It applies to blower categories 1G, 2G or 3G, i.e. blowers for zones 0, 1, 2 or for explosive atmospheres in zones 1 or 2. It also applies to blowers of categories 2D and 3D, i.e. for transport of and/or use in areas with explosive dust/air mixtures of zones 21 and 22 but not air/dust mixtures of zone 20. The standard enables producers to assess the ignition hazard of an explosion-protected lower and lists constructional requirements and testing requirements. This enables the producer to construct explosion-proof blowers. The standard was intended for publication in the first half of 2006. (orig.)

  6. Simple on-site assembled blower-mister device provides sufficient humidification and visualization in off-pump surgery.

    Science.gov (United States)

    Wippermann, Jens; Albes, Johannes M; Liebing, Kai; Breuer, Martin; Kaluza, Mirko; Strauch, Justus; Wahlers, Thorsten

    2006-09-01

    To effectively perform an anastomosis on a coronary artery under beating heart conditions, the anastomotic site must be cleared of blood to allow visualization for accurate suturing. We describe a simple, cost effective, on-site assembled blower-mister system.

  7. The impact of rotary lobe blower seal upgrades at INCO's Copper Cliff Nickel Refinery

    Energy Technology Data Exchange (ETDEWEB)

    Corless, C; Costigan, J. [INCO Copper Cliff Nickel Refinery, Copper Cliff, ON (Canada)

    2000-10-01

    INCO's Pressure Carbonyl (IPC) plant at Copper Cliff is unique in the world in that it utilizes the same basic chemistry, but forms the nickel carbonyl at high pressure to accelerate the reaction and utilize less pure refinery feeds. Two main process gases are used, namely carbon monoxide and nickel carbonyl which are transported throughout the plant using various compressors and blowers depending on whether the gas is at high pressure or at low pressure. The high-pressure transport is accomplished by three five-stage reciprocating compressors. There are numerous low pressure gas blowers; all of them must have seals to ensure that the gas does not escape into the plant atmosphere, and just as importantly, to prevent the lubricating oil from entering the process gases. This paper describes an incident in 1997 when Castrol R40, a lubricant, entered the IPC plant carrier gas stream, adversely affecting equipment availability and process control. The main source of the Castrol R40 was determined to be the carrier gas and low pressure gas blowers. The entry of Castrol R40 into the carrier gas stream was successfully prevented when the mechanical shaft seals were replaced with Ferrofluidics seals. Details of the resulting new sealing arrangements, the status of blower upgrade project and results achieved to date are reviewed.

  8. Blower door tests of a group of identical flats in a new student accommodation in the Arctic

    DEFF Research Database (Denmark)

    Kotol, Martin; Rode, Carsten; Vahala, Jan

    air quality (IAQ) as well as performance of some single components. In summer 2012 a blower door test was performed on all 37 living units out of which 33 are identical single room flats and 4 are larger double room flats. The purpose was to evaluate the air tightness of the envelope and to find out...

  9. Drum rotor blowers in EC technology. Energy conservation, comfortable control, low noise; Trommellaeufer-Ventilatoren in EC-Technik. Energieersparnis, komfortable Regelung und geringe Geraeuschentwicklung

    Energy Technology Data Exchange (ETDEWEB)

    Sigloch, U. [ebm-papst Mulfingen GmbH und Co. KG (Germany). Projektmanagement Vertrieb Europa; Reiff, E.C. [Redaktionsbuero Stutensee (Germany)

    2008-07-01

    Compact drum rotor blowers with forward-curved blades are quite common in air conditioning and ventilation because of their high efficiency and compact dimensions. They are found in air conditioner boxes, in air current systems in department stores, or in fan coils in hotel rooms, wherever other types of blowers would be too big. Until recently, EC technology was not available for the blower motors so the users had do accept low efficiency and the poor control options of conventional AC drives. This has changed by now. (orig.)

  10. Energy conservation measures cause damage to radial blowers; Mechanical consequences are not always taken into account. Energiebesparing kraakt radiale ventilatoren; Mechanische consequenties worden niet altijd onderkend

    Energy Technology Data Exchange (ETDEWEB)

    Hillebrand, A.F. (Hoogovens IJmuiden (Netherlands))

    1991-02-01

    Hoogovens IJmuiden, the iron and steel division of the Hoogovens Groep, has tried to save energy by changing the operation mode of installed blowers, which have capacities to 2.5 MW. Instead of continuous operation a start-stop procedure has been introduced. However, service life of the blowers can be affected seriously because mechanical damage of impellers by fatigue has been observed. Replacement or better constructed impellers increase costs or investment and the latter demands skill of blower producers which is not always available. 3 figs., 2 refs., 1 ill.

  11. Bergemann lance-type water blowers for coal boilers; Bergemann-Wasserlanzenblaeser fuer Kohlekessel

    Energy Technology Data Exchange (ETDEWEB)

    Bartels, F.; Weber, H.G.

    1995-12-31

    Residues from coal combustion create considerable problems for boilers. Slag and ashes on heating surfaces have a negative influence on steam generator efficiency and reduce boiler cycles. If different types of coal are used there are not only specific demands for stable furnace operation but problems of slag control at the different steam generator surfaces. Vaporiser heating surfaces of combustion chambers show extra-tough slag which can not always be removed by steam or air blowers. Forty years ago one therefore started using water as an alternative cleaning agent. At first, hand-held lances were used. Due to its high kinetic energy, water jets penetrate the pores of the slag layers on the vaporiser pipes where it evaporates and makes the slag pop off due to the sudden considerable increase in volume. These results consequently lead to the mechanisation of water-blowing as early as the 1950s; steam soot blowers were retrofitted for water. The Bergemann company used its own system of wall-blowers and improved the water blowing technology with the help of RWE by testing the technology under real life conditions in one or RWE`s lignite power stations. (orig.) [Deutsch] Rueckstaende aus der Verbrennung von Kohle-Brennstoffen fuehren beim Betrieb von Kesselanlagen zu erheblichen Problemen. Der Wirkungsgrad der Dampferzeuger wird durch zum Teil hartnaeckige Ansaetze von Schlacken und Aschen auf den Heizflaechen negativ beeinflusst und die Kessel-Reisezeit herabgesetzt. Besonders die Verbrennung von verschiedenen Kohlearten mit einem breiten Brennstoffband fuehrt neben spezifischen Anforderungen an den stabilen Feuerungsbetrieb vor allem auch zu den Fragen der Beherrschung von Verschlackungen an den unterschiedlichen Dampferzeugerheizflaechen. An den Verdampferheizflaechen der Brennkammern koennen besonders hartnaeckige Verschlackungen auftreten, die mit Dampf und Luft als Blasmedium nicht immer zu entfernen sind. Wasser wurde deshalb als alternatives Reinigungsmedium

  12. Enhancing the operational dependability of oil and gas burners: radial blowers with compression in two stages; Zur Erhoehung der Betriebssicherheit von Oel- und Gasbrennern: Radialgeblaese mit zweistufiger Verdichtung

    Energy Technology Data Exchange (ETDEWEB)

    Koehler, H. [Produktmanagement Anwendungstechnik, Oertli-Rohleder Waermetechnik GmbH, Moeglingen (Germany)

    1999-02-01

    A blower system for oil and gas burners with blowers (Duopress) is described which achieves high blower compression at low rates of air intake. The high starting resistance of burners is thus easily overcome and operational dependability is much enhanced. Moreover, the system permits modular construction of burner blowers. As a consequence, different sizes of burners can be built and their ease of maintenance is enhanced. (orig.) [Deutsch] Es wird ein Geblaesesystem fuer Oel- oder Gasgeblaesebrenner (Duopress) vorgestellt, welches es ermoeglicht, hohe Geblaesepressungen bei niedrigem Luftvolumenstrom zu erreichen. So lassen sich die hohen Anfahrwiderstaende bei den Brennerstarts muehelos ueberwinden, und man kann eine deutlich gesteigerte Betriebssicherheit erreichen. Das vorgestellte System ermoeglicht zudem eine modulare Bauweise der Brennergeblaese. Dadurch koennen auf einfache Art verschiedene Baugroessen eines Brenners realisiert und die Wartungsfreundlichkeit der Brenner gesteigert werden. (orig.)

  13. Blower speed variation in refrigeration engineering and potential applications; Verschiedene Verfahren der Drehzahlveraenderung von Ventilatoren in der Kaeltetechnik mit einer Betrachtung moeglicher Anwendungsfaelle

    Energy Technology Data Exchange (ETDEWEB)

    Albig, J. [Ziehl-Abegg AG, Kuenzelsau (Germany)

    2006-07-01

    Various methods of blower speed control in refrigeration engineering enable user-oriented efficiency increase in axial blowers in refrigeration engineering. Apart from the motor efficiency, the economic efficiency of a blower is also determined by the investment cost of speed control systems. The blower efficiency is left out of account in this contribution. The most common control systems were compared, i.e. voltage control, frequency control and EC control. For an optimum result, the optimum system must be selected already in the planning stage. For this, the advantages and shortcomings must be known for each solution and application. Exemplary recommendations are given for various applications, and the speed control systems described are compared with regard to their efficiency and investment cost. (orig.)

  14. Use of lance-type water blowers in refuse incineration plants; Einsatz von Wasserlanzenblaesern in Muellverbrennungsanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Schaefers, W.; Fey, W. [Babcock-Steinmueller GmbH, Gummersbach (Germany); Simon, S.; Kahle, F.D. [Clyde Bergemann GmbH, Wesel (Germany)

    1999-10-01

    In order to achieve the desired boiler campaign lengths in refuse incineration plants, cleaning devices are an absolute necessity. Whereas the cleaning of convective heating surfaces in vertical-pass and horizontal-pass boilers presents no great difficulty, the possibilities for effective cleaning of the radiant passes were up to now limited. The use of lance-type water blowers has considerably improved this situation. (orig.) [German] Um die gewuenschten Reisezeiten bei Muellverbrennungsanlagen einhalten zu koennen, ist der Einsatz von Reinigungseinrichtungen notwendig. Waehrend die Reinigung der Konvektivheizflaechen bei Vertikal- und Horizontalzugkesseln keine Probleme bereitet, waren bisher die Moeglichkeiten zur Reinhaltung der Strahlungszuege begrenzt. Durch den Einsatz von Wasserlanzenblaesern ergibt sich hier eine deutlich verbesserte Situation. (orig.)

  15. Blowers in bus systems; Einsatz von Ventilatoren in BUS-Systemen

    Energy Technology Data Exchange (ETDEWEB)

    Schneeweiss, H. [ebm - Werke GmbH und Co., Mulfingen (Germany). R und D

    2000-07-01

    Modern industrial blowers are compact and have good control characteristics. Centralized or decentralized monitoring has become a state-of-the-art technology. Bus systems make it possible to monitor and analyze component status at any time. Electronically commutated external rotor motors with bus interfaces offer a wide spectrum of applications. [German] Beim Einsatz von Ventilatoren und Geblaesen in der Industrie ist es heute Standard, dass die Geraete einen kompakten Aufbau und gute Regel- bzw. Steuereigenschaften aufweisen. Immer mehr setzt sich auch die zentrale und dezentrale Ueberwachung von Geraeten durch. Mit einem BUS-System kann der aktuelle Status jeder Komponente jederzeit abgefragt und der Zustand analysiert werden. Durch spezielle Einsatzbedingungen werden heute elektronisch kommutierte Aussenlaeufermotoren mit BUS-Schnittstellen versehen. Damit steht ein breites Anwendungsspektrum zur Verfuegung. (orig.)

  16. A Blower-Like Approach to Predict the Effectiveness of Vaccines in a TB Dynamic Carlos

    Directory of Open Access Journals (Sweden)

    Frederico Fronza

    2014-06-01

    Full Text Available In this paper we present an extension of an automata approach proposed by S. Blower (1998 to describe the tuberculosis progression in a bi-dimensional space. In our extended model, the vaccination was included as an inhibitory variable in order to study its influence on the behavior of the tuberculosis spread. Our simulations showed that the earlier the vaccine is administered in the population, the lower the number of infected individuals, as expected for an in vivo system. However, our results also indicated that although the usual vaccination processes help reducing the strength of infection, the disease is not extinct, remaining the endemic state at low levels. These results strongly suggest that further actions are needed to increase the effectiveness of immunizations.

  17. Testicular cancer trends as 'whistle blowers' of testicular developmental problems in populations

    DEFF Research Database (Denmark)

    Skakkebaek, N E; Rajpert-De Meyts, Ewa; Jørgensen, N;

    2007-01-01

    in TGCC rates of a population may be 'whistle blowers' of other reproductive health problems. As cancer registries are often of excellent quality - in contrast to registries for congenital abnormalities - health authorities should consider an increase in TGCC as a warning that other reproductive health......Recently a worldwide rise in the incidence of testicular germ cell cancer (TGCC) has been repeatedly reported. The changing disease pattern may signal that other testicular problems may also be increasing. We have reviewed recent research progress, in particular evidence gathered in the Nordic....../disorders of sex differentiation and male fertility problems may be symptoms with varying penetration. In spite of their fetal origin, most of the TDS symptoms, including TGCC and poor semen quality, can only be diagnosed in adulthood. Data from a Danish-Finnish research collaboration strongly suggest that trends...

  18. Testicular cancer trends as 'whistle blowers' of testicular developmental problems in populations

    DEFF Research Database (Denmark)

    Skakkebaek, N E; Rajpert-De Meyts, E; Jørgensen, N

    2007-01-01

    Recently a worldwide rise in the incidence of testicular germ cell cancer (TGCC) has been repeatedly reported. The changing disease pattern may signal that other testicular problems may also be increasing. We have reviewed recent research progress, in particular evidence gathered in the Nordic...... countries, which shows strong associations between testicular cancer, undescended testis, hypospadias, poor testicular development and function, and male infertility. These studies have led us to suggest the existence of a testicular dysgenesis syndrome (TDS), of which TGCC, undescended testis, hypospadias...... in TGCC rates of a population may be 'whistle blowers' of other reproductive health problems. As cancer registries are often of excellent quality - in contrast to registries for congenital abnormalities - health authorities should consider an increase in TGCC as a warning that other reproductive health...

  19. Cosmet'eau-Changes in the personal care product consumption practices: from whistle-blowers to impacts on aquatic environments.

    Science.gov (United States)

    Bressy, Adèle; Carré, Catherine; Caupos, Émilie; de Gouvello, Bernard; Deroubaix, José-Frédéric; Deutsch, Jean-Claude; Mailler, Romain; Marconi, Anthony; Neveu, Pascale; Paulic, Laurent; Pichon, Sébastien; Rocher, Vincent; Severin, Irina; Soyer, Mathilde; Moilleron, Régis

    2016-07-01

    The Cosmet'eau project (2015-2018) investigates the "changes in the personal care product (PCP) consumption practices: from whistle-blowers to impacts on aquatic environments." In this project, the example of PCPs will be used to understand how public health concerns related to micropollutants can be addressed by public authorities-including local authorities, industries, and consumers. The project aims to characterize the possible changes in PCP consumption practices and to evaluate the impact of their implementation on aquatic contamination. Our goals are to study the whistle-blowers, the risk perception of consumers linked with their practices, and the contamination in parabens and their substitutes, triclosan, and triclocarban from wastewater to surface water. The project investigates the following potential solutions: modifications of industrial formulation or changes in consumption practices. The final purpose is to provide policy instruments for local authorities aiming at building effective strategies to fight against micropollutants in receiving waters.

  20. The Screw Blower Use for Save Energy%螺杆风机的节能改造

    Institute of Scientific and Technical Information of China (English)

    梁恒伟

    2015-01-01

    本文通过对负责单位污水处理车间改造螺杆风机为变频器控制,较好地使设备运转更平稳,降低了用电及维护费用,同时减少了单位生产成本,提高了设备的运行效率,响应了当今节能降耗的号召。%To change screw blower controlling and save electric cost for the company waste water treatment Plant.It is improve to screw blower use efficient as well as responded to the call of saving energy and reducing consumption today.

  1. Continuous boiler cleaning with explosion generators. The alternative to soot blowers; Heizflaechenabreinigung mit Explosionsgeneratoren. Die Alternative zu Russblaesern

    Energy Technology Data Exchange (ETDEWEB)

    Steiner, Christian; Rueegg, Hans [Explosion Power GmbH, Lenzburg (Switzerland); Pajarskas, Arno [Explosion Power DE GmbH, Duesseldorf (Germany)

    2011-07-01

    The explosion generator was recently developed by Explosion Power GmbH. With explosion generators, the boiler is cleaned by pressure waves, which are created by controlled gas explosions of natural gas and oxygen. The experience of 22 months of operation in the WtE plant in Lucerne shows that the cleaning efficiency of the explosion generators is much higher than that of soot blowers. Explosion generators are installed Europe-wide in more than 13 different boiler lines. (orig.)

  2. Cosmet'eau -Changes in the personal care product consumption practices: from whistle-blowers to impacts on aquatic environments

    OpenAIRE

    Bressy, Adèle; Carré, Catherine; Caupos, Émilie; Gouvello, Bernard de; Deroubaix, José-Frédéric; Deutsch, Jean-Claude; Mailler, Romain; Marconi, Anthony; Neveu, Pascale; Paulic, Laurent; Pichon, Sébastien; Rocher, Vincent; Severin, Irina; SOYER, Mathilde; Moilleron, Régis

    2016-01-01

    International audience; The Cosmet'eau project (2015-2018) investigates the " changes in the personal care product (PCP) consumption practices: from whistle-blowers to impacts on aquatic environments. " In this project, the example of PCPs will be used to understand how public health concerns related to micropollutants can be addressed by public authorities – including local authorities –, industries and consumers. The project aims to characterize the possible changes in PCP consumption pract...

  3. Effects of inlet radius and bell mouth radius on flow rate and sound quality of centrifugal blower

    Energy Technology Data Exchange (ETDEWEB)

    Son, Pham Ngoc; Kim, Jae Won; Byun, S. M. [Sunmoon University, Asan (Korea, Republic of); Ahn, E. Y. [Hanbat National University, Daejeon (Korea, Republic of)

    2012-05-15

    The effect of inlet radius and bell mouth radius on flow rate of centrifugal blower were numerically simulated using a commercial CFD program, FLUENT. In this research, a total of eight numerical models were prepared by combining different values of bell mouth radii and inlet radii (the cross section of bell mouth was chosen as a circular arc in this research). The frozen rotor method combined with a realizable k-epsilon turbulence model and non-equilibrium wall function was used to simulate the three-dimensional flow inside the centrifugal blowers. The inlet radius was then revealed to have significant impact on flow rate with the maximum difference between analyzed models was about 4.5% while the bell mouth radius had about 3% impact on flow rate. Parallel experiments were carried out to confirm the results of CFD analysis. The CFD results were thereafter validated owning to the good agreement between CFD results and the parallel experiment results. In addition to performance analysis, noise experiments were carried out to analyze the dependence of sound quality on inlet radius and bell mouth radius with different flow rate. The noise experiment results showed that the loudness and sharpness value of different models were quite similar, which mean the inlet radius and the bell mouth radius didn't have a clear impact on sound quality of centrifugal blower.

  4. Safety demonstration tests on pressure rise in ventilation system and blower integrity of a fuel-reprocessing plant

    Energy Technology Data Exchange (ETDEWEB)

    Takada, Junichi; Suzuki, Motoe; Tsukamoto, Michio; Koike, Tadao; Nishio, Gunji [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    1996-12-01

    In JAERI, the demonstration test was carried out as a part of safety researches of the fuel-reprocessing plant using a large-scale facility consist of cells, ducts, dumpers, HEPA filters and a blower, when an explosive burning due to a rapid reaction of thermal decomposition for solvent/nitric acid occurs in a cell of the reprocessing plant. In the demonstration test, pressure response propagating through the facility was measured under a blowing of air from a pressurized tank into the cell in the facility to elucidate an influence of pressure rise in the ventilation system. Consequently, effective pressure decrease in the facility was given by a configuration of cells and ducts in the facility. In the test, transient responses of HEPA filters and the blower by the blowing of air were also measured to confirm the integrity. So that, it is confirmed that HEPA filters and the blower under pressure loading were sufficient to maintain the integrity. The content described in this report will contribute to safety assessment of the ventilation system in the event of explosive burning in the reprocessing plant. (author)

  5. Transient performance characteristics of uncontrolled and controlled ventilation systems with a single blower, two blowers connected in parallel, or two blowers connected in series; Das instationaere Betriebsverhalten ungeregelter und geregelter lufttechnischer Anlagen mit einem, zwei in Reihe oder zwei parallelgeschalteten Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Schulze Dieckhoff, B.

    1999-07-01

    Transient performance characteristics of uncontrolled and controlled ventilation systems with single blowers and blowers connected in series and in parallel are investigated. The model comprises mathematical models of transient, frictional and one-dimensional flow in the plant components. The pipeline component is modelled using so-called distributed parameters. The controller assumed in the model is a randomly parametrizable PID controller. The effects of time-dependent controlled controller actions are investigated to begin with in order to identify global system instabilities. An important class of flow-linduced instabilities are continuous, self-excited pressure and mass flow pulsations (pumping) or, in case of blowers connected in parallel, periodic alternating blower volume increase (oscillation). These two types of oscillation are based on fundamentally different, nonlinear physical mechanisms. Control of pressures and mass flow in ventilation systems is investigated, e.g. by analyzing controller-induced oscillations. [German] Es wird das instationaere Betriebsverhalten ungeregelter und geregelter lufttechnischer Anlagen mit Ventilatoren in Einzelanordnung, Reihen- und Parallelschaltung untersucht. Wesentliche Elemente des Rechenmodells sind mathematische Modelle fuer die instationaere, reibungsbehaftete und eindimensionale Stroemung in den Anlagenkomponenten. Die Komponente 'Rohrleitung' ist mit sog. verteilten Parametern modelliert. Als Regler ist ein beliebig parametrierbarer PID-Regler modelliert. Zunaechst werden die Auswirkungen zeitabhaengiger, gesteuerter Stelleingriffe untersucht. Ein wesentliches Ergebnis ist die Identifikation globaler Systeminstabilitaeten. Eine wichtige Klasse stroemungsbedingter Instabilitaeten sind kontinuierliche, selbsterregte Druck- und Massenstrompulsationen (Pumpen) oder, bei parallelgeschalteten Ventilatoren, eine periodische, wechselweise Mehrfoerderung der Ventilatoren (Pendeln). Diesen beiden

  6. Design requirements to magnetic bearings for primary circuit blowers of high-temperature reactors. Final report; Auslegungsanforderungen an Magnetlager fuer Primaerkuehlgasgeblaese von Hochtemperaturreaktoren. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    1992-02-12

    To study the operational behaviour of blower shafts with magnetic bearings, a modular computer model was set up based on model laws, which permits to simulate shaft behaviour during dynamic loads acting on the blower shaft. During simulation runs, essential properties of position regulation (guide behaviour, secondary behaviour, and fault behaviour), and the behaviour of the blower shaft in the event of failure of a final stage of magnetic bearing electronics, with not-single-failure-proof and with failure-tolerant design of the final stages, as well as the effects of mechanical vibrations, e.g. as a result of earthquakes, on the behaviour of blower shafts were investigated. In order to transfer the results of the catch bearing tests to other designs of blowers with a vertical blower shaft, transmission laws and procedures were derived from theoretical considerations and from a dimension analysis which, however, could not be verified by means of tests. Application of the test results to horizontally placed blower shafts is possible only in part. The computer simulation model set up for the behaviour of the blower shafts is applicable without significant limitations to other blower shaft arrangements. (orig.). [Deutsch] Zur Untersuchung des Betriebsverhaltens magnetisch gelagerter Geblaesewellen wurde anhand von Modellgesetzen ein modulares Rechenmodell aufgebaut, das die Simulation des Wellenverhaltens bei auf die Geblaesewelle wirkenden dynamischen Belastungen erlaubt. In Simulationslaeufen wurden wesentliche Eigenschaften der Lageregelung (Fuehrungsverhalten, Folgeverhalten und Stoerungsverhalten) und das Verhalten der Geblaesewellen bei Ausfall einer Endstufe der Magnetlagerelektronik bei nicht einzelfehlersicherer und bei fehlertoleranter Ausfuehrung der Endstufen sowie die Auswirkungen mechanischer Erschuetterungen z.B. infolge von Erdbeben auf das Verhalten der Geblaesewelle untersucht. Zur Uebertragung der Ergebnisse der Fanglagerversuche auf andere

  7. Testicular cancer trends as 'whistle blowers' of testicular developmental problems in populations.

    Science.gov (United States)

    Skakkebaek, N E; Rajpert-De Meyts, E; Jørgensen, N; Main, K M; Leffers, H; Andersson, A-M; Juul, A; Jensen, T K; Toppari, J

    2007-08-01

    Recently a worldwide rise in the incidence of testicular germ cell cancer (TGCC) has been repeatedly reported. The changing disease pattern may signal that other testicular problems may also be increasing. We have reviewed recent research progress, in particular evidence gathered in the Nordic countries, which shows strong associations between testicular cancer, undescended testis, hypospadias, poor testicular development and function, and male infertility. These studies have led us to suggest the existence of a testicular dysgenesis syndrome (TDS), of which TGCC, undescended testis, hypospadias/disorders of sex differentiation and male fertility problems may be symptoms with varying penetration. In spite of their fetal origin, most of the TDS symptoms, including TGCC and poor semen quality, can only be diagnosed in adulthood. Data from a Danish-Finnish research collaboration strongly suggest that trends in TGCC rates of a population may be 'whistle blowers' of other reproductive health problems. As cancer registries are often of excellent quality - in contrast to registries for congenital abnormalities - health authorities should consider an increase in TGCC as a warning that other reproductive health problems may also be rising.

  8. Effect of Inlet Clearance on the Aerodynamic Performance of a Centrifugal Blower

    Science.gov (United States)

    Hariharan, C.; Govardhan, M.

    2016-09-01

    The present work reports the effect of inlet clearance on the performance of a centrifugal blower, with parallel wall volute, over its full operating range. For a particular impeller configuration, four volutes based on constant angular momentum principle, have been designed and analysed numerically for varying inlet clearances ranging from 0 mm (ideal clearance) to 5 mm. The computational methodology is validated using experimental data. The results indicate that as the clearance increases, the impeller performance in terms of both static and total pressure rise deteriorate. Further, the stage performances deteriorate in terms of efficiency and specific work for all mass flow rates. However, the performance of volute improves at lower mass flow rates compared to the Best Efficiency Point (BEP). A set of correlations have been developed to predict the change in stage performance as a function of clearance ratio. The non-dimensional values of change in specific work, isentropic efficiency and static pressure are found to be same irrespective of the shape of the volute.

  9. Blower/air cooler with internally finned tubes; Ventilator-Luftkuehler mit innenberippten Rohren

    Energy Technology Data Exchange (ETDEWEB)

    Arnemann, M. [FKU - Forschungszentrum fuer Kaelte- und Umwelttechnik, Berlin (Germany)

    1997-12-31

    Heat transfer is higher in finned tubes than in smooth tubes. In order to assess the extent of improvement, internal heat tranfer coefficients and pressure losses of smooth and finned tubes were investigated on behalf of Walter Roller GmbH and Co. Two blower-type air coolers of identical design (except for the tubes) were investigated in a calorimeter using R22 and different refrigerant mass flows, evaporation temperatures and air temperatures. The results are the basis for new develoments by Walter Roller. Energetic assessment of the new type of evaporator was made on the basis of the DIN 8955 and ENV 328 standards. The results and findings are presented. (orig.) [Deutsch] Der Einsatz von innenberippten Rohren laesst im Vergleich mit glatten Rohren einen deutlich verbesserten inneren Waermeuebergang erwarten. Zur Abschaetzung der Groessenordnung dieser Verbesserungen wurden im Auftrag der Firma Walter Roller GmbH and Co. die inneren Waermeuebergangskoeffizienten und die Druckverluste von glatten und innenberippten Rohren experimentell bestimmt. Dazu wurden zwei bis auf die Rohre baugleiche Ventilator-Luftkuehler ineinem Kalorimeter untersucht. Mit dem Kaeltemittel R22 wurden fuer verschiedene Kaeltemittelmassenstroeme, Verdampfungstemperaturen und Lufttemperaturen die Kennzahlen bestimmt, die zur Charakterisierung der Rohre dienlich sind. Die Ergebnisse bildeten die Grundlage fuer eine Neuentwicklung im Hause Walter Roller. Die energetische Bewertung des neuen Verdampfertyps erfolgte in Anlehnung an die Normen DIN 8955 bzw. ENV 328. Die Untersuchungen und die Ergebnisse werden praesentiert. (orig.)

  10. A noninvasive high frequency oscillation ventilator: Achieved by utilizing a blower and a valve.

    Science.gov (United States)

    Yuan, YueYang; Sun, JianGuo; Wang, Baicun; Feng, Pei; Yang, ChongChang

    2016-02-01

    After the High Frequency Oscillatory Ventilation (HFOV) has been applied in the invasive ventilator, the new technique of noninvasive High Frequency Oscillatory Ventilation (nHFOV) which does not require opening the patient's airway has attracted much attention from the field. This paper proposes the design of an experimental positive pressure-controlled nHFOV ventilator which utilizes a blower and a special valve and has three ventilation modes: spontaneous controlled ventilation combining HFOV, time-cycled ventilation combining HFOV (T-HFOV), and continuous positive airway pressure ventilation combining HFOV. Experiments on respiratory model are conducted and demonstrated the feasibility of using nHFOV through the control of fan and valve. The experimental ventilator is able to produce an air flow with small tidal volume (VT) and a large minute ventilation volume (MV) using regular breath tubes and nasal mask (e.g., under T-HFOV mode, with a maximum tidal volume of 100 ml, the minute ventilation volume reached 14,400 ml). In the process of transmission, there is only a minor loss of oscillation pressure. (Under experimental condition and with an oscillation frequency of 2-10 Hz, peak pressure loss was around 0%-50% when it reaches the mask.).

  11. Condition Monitoring of Forward Curved Centrifugal Blower Using Coast Down Time Analysis

    Directory of Open Access Journals (Sweden)

    G. R. Rameshkumar

    2010-01-01

    Full Text Available Mechanical malfunctions such as, rotor unbalance and shaft misalignment are the most common causes of vibration in rotating machineries. Vibration is the most widely used parameter to monitor and asses the machine health condition. In this work, the Coast Down Time (CDT, which is an indicator of faults, is used to assess the condition of the rotating machine as a condition monitoring parameter. CDT is the total time taken by the system to dissipate the momentum acquired during sustained operation. Extensive experiments were conducted on Forward Curved Centrifugal Blower Test Rig at selected cutoff speeds for several combinations of combined horizontal and vertical parallel misalignment, combined parallel and angular misalignment, as well as for various unbalance conditions. As mechanical faults increase, a drastic decrease in CDT is found and this is represented as CDT reduction percentage. A specific correlation between the CDT reduction percentage, level of mechanical faults, and rotational cutoff speeds is observed. The results are analyzed and compared with vibration analysis for potential use of CDT as one of the condition monitoring parameter.

  12. Enhancement of Nutrient Removal in a Hybrid Constructed Wetland Utilizing an Electric Fan Air Blower with Renewable Energy of Solar and Wind Power

    Directory of Open Access Journals (Sweden)

    Dong Jin Lee

    2015-01-01

    Full Text Available The sewage treatment efficiency of hybrid constructed wetlands (CWs was evaluated under different ventilation methods. The removal efficiencies of biochemical oxygen demand (BOD, total nitrogen (TN, and total phosphorus (TP in the vertical flow- (VF- horizontal flow (HF CWs using an electric fan air blower by the renewable energy of solar and wind power were higher than those by natural ventilation, excluding only suspended solids (SS. The TN treatment efficiency in the CW using the air blower especially increased rapidly by 16.6% in comparison with the CW employing natural ventilation, since the VF bed provided suitable conditions (aerobic for nitrification to occur. The average removal efficiencies of BOD, SS, TN, and TP in the effluent were 98.8, 97.4, 58.0, and 48.3% in the CW using an electric fan air blower, respectively. The treatment performance of the CWs under different ventilation methods was assessed, showing TN in the CW using an electric fan air blower to be reduced by 57.5~58.6% for inlet TN loading, whereas reduction by 19.0~53.3% was observed in the CW with natural ventilation. Therefore, to increase the removal of nutrients in CWs, an improved ventilation system, providing ventilation via an electric fan air blower with the renewable energy, is recommended.

  13. Optimisation of acoustics and efficiency of axial blowers, e.g. in liquefiers or recirculation coolers; Optimierung der Akustik und der Effizienz von Axialventilatoren, die beispielsweise auf Verfluessigern und Rueckkuehlern eingesetzt werden

    Energy Technology Data Exchange (ETDEWEB)

    Dietle, J.; Neumeier, R. [Ziehl-Abegg AG, Kuenzelsau (Germany)

    2006-07-01

    Blowers are the main source of noise in air-cooled refrigerator components. The noise development mechanisms can be characterized as flow noise, mechanical noise and electrical noise, which are differentiated depending on the type of application. The optimisation of the blower and overall system is illustrated for different influencing factors. (orig.)

  14. Application of transient numeric simulation methods for calculating aeroacoustic sources of noise in axial blowers; Anwendung von instationaeren numerischen Simulationsmethoden zur Berechnung aeroakustischer Schallquellen bei Axialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Reese, H.

    2007-07-01

    The publication intends to contribute to the calculation of aeroacoustic noise of axial blowers. Using the example of a typical low-pressure axial blower, the transient flow field, aeroacoustic sound waves and noise emissions are calculated. Four methods of numeric flow simulation are used, each with a different degree of approximation. In order to investigate different noise development mechanisms, flow to the blower rotor was investigated in the undisturbed state and in a highly turbulent state. Low-frequency noise as a rule is dominated by mechanisms like secondary flow or turbulent inflow which can be predicted rather well by numeric simulations of medium accuracy. Higher-frequency noise resulting from the turbulent boundary layer can only be predicted by large eddy simulation, which is quite time-consuming. (orig.)

  15. Potential of energy conservation in heating systems by means of blower convectors; Energieeinsparungspotential in Heizungsystemen durch den Einsatz von Geblaesekonvektoren

    Energy Technology Data Exchange (ETDEWEB)

    Binder, Andreas; Raisch, Ingo

    2011-07-01

    Blowers are used for heating in buildings, mostly under windows, in corners, or in niches. When heating systems are modernized, it is a useful strategy to reduce the flow temperature, but this means that the existing radiator is underdimensioned. A convective blower is presented that fits into most heating niches and provides the same capacity at lower water temperatures. Disadvantages are electric power consumption, higher noise, and faster soiling. Advantages are fast and comfortable room temperature control and the possibility of cooling. Theoretical assessments are made to investigate the potential savings resulting from convective blowers as well as their effects in terms of comfort and air quality. [German] In Gebaeuden werden zur Raumheizung in vielen Faellen Radiatoren eingesetzt. Diese werden beispielsweise unter Fenstern oder in Ecken platziert. Der Architekt sieht fuer den Einbau der Geraete oftmals eine Nische vor. Wird das komplette Heizungssystem saniert, ist es unter energetischen Gesichtspunkten sinnvoll die Vorlauftemperatur zu reduzieren. Der vorhandene Heizkoerper ist damit unterdimensioniert. Es wird ein Geblaesekonvektor entwickelt, der in eine Vielzahl der architektonisch ueblichen Heiznischen passt. Bei Abgabe der gleichen thermischen Leistung, ist es mit diesem Geraet moeglich die Heizung bei geringeren Wassertemperaturen zu betreiben. Die Beheizung von Raeumen mittels Konvektoren ist aber auch mit einigen Nachteilen behaftet, so wird elektrische Energie benoetigt, die Geraete emittieren Schall und neigen staerker zur Verschmutzung. Dem gegenueber stehen einige Vorteile wie einer schnelleren und komfortableren Regelung der Raumtemperatur und die Moeglichkeit zu Kuehlen. Es werden theoretische Abschaetzungen durchgefuehrt, wie gross das Einsparpotential durch Geblaesekonvektoren sein kann, und wie sich die Umstellung auf den Komfort, und die Luftqualitaet auswirkt.

  16. Automation of the control system and reform of the COSIPA no. 3 turbo blower; Automacao dos sistema de controle e reforma do turbo soprador n. 3 da Cosipa

    Energy Technology Data Exchange (ETDEWEB)

    Kobukloski, Sandro; Martins, Marcos Rogerio S.; Garcia, Jose Eduardo da S.; Reis, Joao de Paula; Romao Junior, Wilson; Vilarinho, Joao Clovis; Spinassi, Luiz Carlos; Florencio, Aurelio Freire; Rocha, Jose Olimpio Castro Pereira da [Companhia Siderurgica Paulista (COSIPA), Cubatao, SP (Brazil)

    2001-07-01

    The turbo blower no. 3 (TS no. 3) start operation in 1976 blowing for the COSIPA blast furnace no. 2. Since 1993 the equipment was dedicated to the blast furnace no. 1, which is smaller than the previous one, consequently releasing the excess air to the atmosphere. Due to some modifications and for safety of the equipment, an operational conditional has been introducing with higher energy consumption. Due to operational requests a complete machine control system reformation was decided, blower stator and rotor blade replacement, and installation of a self-cleaning pre-filtering system. (author)

  17. 高炉鼓风机的改造实践%Transformation of Blast Furnace Blower

    Institute of Scientific and Technical Information of China (English)

    陈庆凯; 赵健

    2001-01-01

    Transforming method of blast furnace blower is introduced,and main structural dimension after transformation is given. Comparison is carried out on each target before & after transformation. The obtaind economic benefits is described.%介绍了为提高流量的高炉鼓风机改造方案,给出了改造后的主要结构尺寸。对改造前后的各项指标做了对比,说明了取得的经济效益。

  18. Speed-controlled blowers reduce energy consumption in air conditioning systems; Drehzahlregulierte Luefter reduzieren Energieverbrauch einer Klimaanlage

    Energy Technology Data Exchange (ETDEWEB)

    Lutz, W.

    1996-08-01

    Speed-controlled blower engines are described. The engines have four major advantages: Energy conservation and reduction of the operating cost; Variable air volume flow for optimum adaptation to varying operating conditions; Speed control reduces wear; Lower noise at lower speed (higher comfort). (HW) [Deutsch] Es werden drehzahlregulierte Lueftermotoren vorgestellt. Diese Motoren haben 4 wesentliche Vorteile - Energieeinsparung, Senkung der Betriebskosten - variabler Luftvolumenstrom bringt eine optimale Anpassung an die jeweiligen Betriebsbedingungen - eine moegliche Drehzahlreduzierung senkt den Verschleiss - kleinere Drehzahlen machen die Anlage leiser (Komfortverbesserung). (HW)

  19. Damage to soot blowers in a high dust DENOX plant. Schaeden an Russblaesern in einer High-dust-DENOX-Anlage

    Energy Technology Data Exchange (ETDEWEB)

    Bolte, C. (Kraftwerk Voerde, STEAG-RWE oHG (Germany)); Farwick, H. (Kraftwerk Voerde, STEAG-RWE oHG (Germany))

    1993-06-01

    The two 710 MW Units A and B at Voerde are equipped with selective catalytic reduction reactors in the high dust range. Following commissioning of the DENOX plant, the prescribed soot blowing conditions were proven to be adequate. About nine months later, the first operating problems occurred on the soot blowers and these intensified in the course of time. Following the failure of several steam supply pipes, the soot blowing then had to be adjusted to two-way since leaky blast valves became permeable to the condensate and dampening of the catalyser had to be feared. (orig.)

  20. Accurate measurement of air supply. Radial blower with a mass flow sensor; Fuer eine exakte Luftzuteilung. Radialgeblaese mit Massenstromsensor

    Energy Technology Data Exchange (ETDEWEB)

    Hartauer, Siegbert [ebm-papst Landshut GmbH, Landshut (Germany)

    2009-07-01

    Fire is alive, which has always made it an interesting object for interior decoration, e.g. open chimneys or chimneys with glass windows. Modern gas-fuelled chimneys combine the soothing vision of open flames with efficient room heating. For low pollution and low consumption, fire needs fuel and oxygen in an optimum ratio. Conventional ''atmospheric'' burners must be adjusted on site, but variations of temperature and atmospheric pressure will still vary the air supply. As an optimum alternative, the contribution presents a new radial blower with an integrated mass flow sensor. (orig.)

  1. Pressure drop and blower performance tests in very high temperature Helium Experimental LooP (HELP)

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Chan Soo; Hong, Sung Deok; Kim, Yong Wan [KAERI, Daejeon (Korea, Republic of)

    2012-10-15

    Korea Atomic Energy Research Institute (KAERI) has developed the gas loops to develop and verify the key components of the nuclear hydrogen production system. At the present, KAERI is operating a small scale gas loop for feasibility tests of process heat exchanger and a very high temperature Helium Experimental LooP (HELP) for verification tests of bench scale prototypes for high temperature key components in Very High Temperature gas cooled Reactor (VHTR). Figure 1 presents the HELP assembled with the key components. The size was designed for the verification test of a 150kW intermediate heat exchanger or the simulation test in a 1/6 scaled down fuel block. The loop consists of the primary loop and the secondary loop. The primary loop and the secondary loop simulate VHTR and intermediate loop in nuclear hydrogen production system, respectively. The loops were designed to withstand the maximum temperature of 1000 .Deg. C, the maximum pressure of 9.0 MPa, and the normal mass velocity of 0.5 kg/sec. The working fluid is helium as the actual coolant of VHTR. The primary loop is composed of a preheater, a high temperature heater, a hot gas duct, intermediate heat exchangers, a water cooled U tube heat exchanger, a gas bearing circulator, a passive venting system and gas filters. The secondary loop has the same system configuration as the primary loop except a high temperature heater. Two loops share a helium supply system, a helium purification system and the water loop for a cooling tower as Figure 2. In this study, the experimental results of the bypass line pressure drop and blower performance at the nitrogen condition are analyzed to predict the main line mass flow rates without heaters.

  2. Transient tests on blower trip and rod removal at the HTR-10

    Energy Technology Data Exchange (ETDEWEB)

    Hu Shouyin [Institute of Nuclear Energy Technology, Tsinghua University, P.O. Box 1021, Beijing 102201 (China)]. E-mail: hyyhtr@tsinghua.edu.cn; Wang Ruipian [Institute of Nuclear Energy Technology, Tsinghua University, P.O. Box 1021, Beijing 102201 (China); Gao Zuying [Institute of Nuclear Energy Technology, Tsinghua University, P.O. Box 1021, Beijing 102201 (China)

    2006-03-15

    Safety demonstration tests on the 10 MW high temperature gas-cooled reactor test module (HTR-10) were conducted to verify the inherent safety features of MHTGRs and to obtain the core and primary cooling system transient data for validation of safety analysis codes. Two simulated anticipated transients without scram (ATWS) tests, lose of forced cooling by trip of the helium blower and reactivity insertion via control rod withdrawal were performed. This paper describes the tests with detailed test method, condition and results. Calculated results show that the strongly negative temperature coefficient causes reactor power to closely follow heat removal levels. Maximum fuel temperature changes are limited by the large core heat capacity to below 1230 deg. C during two tests. The test of tripping the helium circulator ATWS test was conducted on October 15, 2003. Although none of 10 control rods was moved, the reactor power immediately decreased due to the negative temperature coefficient. After about 50 min, the reactor became criticality again. Finally, the reactor power went to a stable level with about 200 kW. The test of reactivity insertion ATWS test was conducted two times. Following the control rod withdrawal, the reactor power increased rapidly, the maximum power level reached to 5037 and 7230 kW from the initial power of 3000 kW in accordance with reactivity insertion of 0.136 and 0.689, respectively. After the reactivity introduced was compensated by means of the strong negative reactivity feedback effect, the reactor went to subcritical and the power decreased.

  3. CFD calculations in high-performance blower design; Einsatz von CFD-Berechnungen bei der Auslegung von Hochleistungsgeblaesen

    Energy Technology Data Exchange (ETDEWEB)

    Rick, W.; Benz, E.; Godichon, A.

    2001-07-01

    ABB is using 3D CFD simulations on the basis of the Navier-Stokes equations for optimizing high-performance blower design. This will also shorten development times. For an exemplary two-stage blower, numeric results are discussed for full load and part load conditions, and integral measured and calculated data are compared. Using the example of a single-stage variant, it is shown how the spiral casing could be better matched to the rotor on the basis of 3D flow calculation. [German] Fuer den Entwurf von Hochleistungsgeblaesen verwendet ABB in zunehmendem Umfang 3-D CFD-Simulationen auf der Basis der Navier-Stokes-Gleichungen um Komponenten sowie deren Abstimmung zu optimieren. Neben der Erzielung eines verbesserten Betriebsverhaltens koennen durch die Reduzierung experimenteller Untersuchungen kuerzere Entwicklungszeiten erreicht werden. Anhand eines zweiflutigen Geblaeses werden numerische Ergebnisse fuer den Voll- und Teillastbetrieb diskutiert und integrale Leistungsdaten von Rechnung und Messung verglichen. Am Beispiel einer einflutigen Variante wird gezeigt, wie auf der Basis einer 3-D Stroemungsberechnung eine verbesserte Anpassung des Spiralgehaeuses zum Laufrad erzielt werden konnte. (orig.)

  4. EC blowers for school building ventilation. Wholesome climate and high energy efficiency; EC-Ventilatoren fuer Schullueftungskonzepte. Gesundes Klima bei hoher Energieeffizienz

    Energy Technology Data Exchange (ETDEWEB)

    Salig, Andreas [ebm-papst, Mulfingen (Germany). Verkauf Inland; Grohmann, Erwin [Grohmann Lueftungstechnik GmbH, Forchtenberg (Germany); Reiff, Ellen-Christine [Redaktionsbuero Stutensee (Germany)

    2009-07-01

    Government funds of several thousands of millions were provided in 2009 for the modernisation of school buildings. There are highly flexible commercial ventilation and air conditioning systems for this type of buildings which combine energy savings with optimum room air quality. EC blowers contribute to this. (orig.)

  5. Effect of the blade design on the dissipation and noise emission of radial blowers; Einfluss der Schaufelform auf Dissipation und Schallemission bei Radialventilatoren. Aerodynamische und akustische Qualitaetsbeurteilung

    Energy Technology Data Exchange (ETDEWEB)

    Sentek, J. [Akademia Gorniczo-Hutnicza, Cracow (Poland); Bommes, L. [Fachhochschule Duesseldorf (Germany). Inst. fuer Stroemungsmaschinen

    2000-04-01

    The flow condition caused within a radial blower by the blade design is known to have a considerable effect both on the hydraulic losses as well as on the level of the emitted noise. (orig.) [German] Der durch die Schaufelform verursachte Stroemungszustand im Inneren eines Radialventilators hat bekanntermassen einen erheblichen Einfluss sowohl auf die hydraulischen Verluste als auch auf die Staerke der Schallabstrahlung. (orig.)

  6. Criteria for selecting optimum blower drives. Integrated power electronics is gaining ground in the market; Kriterien zur Auswahl des optimalen Ventilatorantriebs. Die integrierte Leistungselektronik gewinnt Marktanteile

    Energy Technology Data Exchange (ETDEWEB)

    Albig, J. [Ziehl-Abegg AG, Kuenzelsau (Germany). Fachbereich Produktmanagement

    2008-05-15

    In the field of speed controllers, systems with power electronics are gaining ground. Thes compact, matched units simplify the installation of refrigeration systems and enable reliable and efficient operation. Design concepts vary between the various producers, and blower design and technology may be quite different. (orig.)

  7. Development of Filter-Blower Unit for use in the Advanced Nuclear Biological Chemical Protection System (ANBCPS) Helicopter/Transport-aircraft version

    NARCIS (Netherlands)

    Sabel, R.; Reffeltrath, P.A.; Jonkman, A.; Post, T.

    2006-01-01

    As a participant in the three-nation partnership for development of the ANBCP-S for use in Helicopters, Transport Aircraft and Fast Jet, the Royal Netherlands Airforce (RNLAF) picked up the challenge to design a Filter- Blower-Unit (FBU). Major Command (MajCom) of the RNLAF set priority to develop a

  8. 气动旋转式吹灰器系统的技术应用%The Actual Application of Pneumatic Soot Blower in Heat Medium Heater

    Institute of Scientific and Technical Information of China (English)

    陈江波

    2000-01-01

    The pneumatic ratchet soot blower and the structure and control principle of CKQ—Ⅱ controller as well as its application in heat medium heater are introduced.The pneumatic ratchet soot blower has got many advantages,such as high level automation control(unattended),soot blower integrated with controller,stable control process,high efficiency and easier to repair compared with conventional soot blower.This soot blower can be adopted in heater and boiler.%介绍了气动旋转式吹灰器和CKQ-Ⅱ型吹灰控制器的结构、控制原理及在热媒炉上的应用,与电动吹灰器相比,气动旋转式吹灰器具有自动化程度高、吹灰器和控制器自成系统、可实现无人职守、控制过程稳定可靠、吹灰效果理想、操作灵活、维修方便等优点。可在各种加热炉、锅炉的吹扫系统中应用。

  9. Preliminary Tests of Blowers of Three Designs Operating in Conjunction with a Wing-Duct Cooling System for Radial Engines, Special Report

    Science.gov (United States)

    Biermann, David; Valentine, E. Floyd

    1939-01-01

    This paper is one of several dealing with methods intended to reduce the drag of present-day radial engine installations and improve the cooling at zero and low air speeds, The present paper describes model wind-tunnel tests of blowers of three designs tested in conjunction with a wing-nacelle combination. The principle of operation involved consists of drawing cooling air into ducts located in the wing root at the point of maximum slipstream velocity, passing the air through the engine baffles from rear to front, and exhausting the air through an annular slot located between the propeller and the engine with the aid of a blower mounted on the spinner. The test apparatus consisted essentially of a stub wing having a 5-foot chord and a 15-foot span, an engine nacelle of 20 inches diameter enclosing a 25-horsepower electric motor, and three blowers mounted on propeller spinners. Two of the blowers utilize centrifugal force while the other uses the lift from airfoils to force the air out radially through the exit slot. Maximum efficiencies of over 70 percent were obtained for the system as a whole. Pressures were measured over the entire flight range which were in excess of those necessary to cool present-day engines, The results indicated that blowers mounted on propeller spinners could be built sufficiently powerful and efficient to warrant their use as the only, or chief, means of forcing air through the cooling system, so that cooling would be independent of the speed of the airplane.

  10. Nozzle and blading geometries of free running radial blowers. Pt. 1. Numeric investigations influencing the flow field; Duesen- und Beschaufelungsgeometrie freilaufender Radialventilatoren. T. 1. Numerische Untersuchungen zum Einfluss auf das Stroemungsfeld

    Energy Technology Data Exchange (ETDEWEB)

    Willburger, A.; Lawerenz, M. [Kassel Univ. (Germany). Fachgebiet Stroemungsmaschinen; Hoppe, L. [TLT-Turbo GmbH (Germany)

    2007-12-15

    Free running radial blowers are used in air conditioning, in ventilation and smoke removal. Low production cost is a key aspect, but driving power and performance have recently become important as well. (orig.)

  11. Dewetting Process of Blast Furnace Blower%高炉鼓风机前脱湿技术

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    Blast furnace dewetting blast is an important measure for energy conservation of blast furnace and it plays an important role in stabilizing production of blast furnace. The dewetting process and features of blast blower are described. The significance to popularize the process in steel enterprises is introduced briefly.%  高炉脱湿鼓风是高炉节能的重要措施,并对高炉的稳定生产具有重要作用。对高炉鼓风机前脱湿的工艺和特点进行说明,并简述其在钢铁企业推广的意义。

  12. Development of the Blower Efficiency Measuring Instrument%风机效率测试仪的研制

    Institute of Scientific and Technical Information of China (English)

    任仁良

    2001-01-01

    This paper describes the basic principles of blower efficiency measuring instrument which is developed by adopting microprocessor technology.Mathematic models of measurement and calculation as well as realization methods are discussed,Software calibration method is used to increase measuring accuracy and reliability.Actual application shows high measuring accuracy and easy operation of the instrument.%本文论述了利用单片机技术研制成功的风机效率测试仪的基本原理、测量和运算的数学模型及其实现方法。采用软件校正的办法,提高了测量精度和可靠性。实际使用表明,该测试仪测量精度高,操作简单。

  13. Failure Analysis of Blower Wheel%鼓风机转子叶轮失效分析

    Institute of Scientific and Technical Information of China (English)

    张峥; 苏梅; 钟群鹏

    2001-01-01

    The failure of blower wheel is caused by corrosion fatigue with the analysis of material, macro and micro fracture appearance, and composition of corrosion material. The crack initiated from the corrosion pits. The analysis result provides the technological support to prevent the same accident.%通过材质、断口宏微观和腐蚀产物成分分析,确定鼓风机转子叶轮失效模式为腐蚀疲劳,鼓风机转子叶轮上裂纹起源于腐蚀坑。分析结果为防止类似事故的再次发生提供了技术依据。

  14. Forecasting of wide band noise in axial blowers. Part 1; Prognoseverfahren fuer den Breitbandlaerm bei Axialventilatoren - Teil 1

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, M.; Carolus, T. [Universitaet Siegen (Germany). Institut fuer Fluid- und Thermodynamik

    2003-04-01

    Next to the aerodynamic data, acoustic emissions of blowers are getting increasing attention. So far, estimates have been very simple, but a number of semi-empirical models have also been published which require more detailed parameters, e.g. the velocity field around the blades, boundary layer parameter, etc. These models provide more accurate predictions than the simpler methods. [German] Neben den aerodynamischen Daten gewinnt die Schallleistung von Ventilatoren in zunehmendem Masse an Bedeutung. In der industriellen Praxis wird das Ventilatorgeraeusch bislang mit sehr einfachen Verfahren abgeschaetzt, die nur grundlegende Maschinengroessen beruecksichtigen. In der Literatur findet man allerdings eine Vielzahl semi-empirischer Modelle fuer die Schallleistungsberechnung von Ventilatoren, die detailliertere Eingangsparameter wie das Geschwindigkeitsfeld um die Schaufeln, Grenzschichtparameter usw. erfordern. Diese Modelle versprechen eine bessere Schallprognose als die einfachen Verfahren. (orig.)

  15. Development of Roots Blower with High Temperature%高温罗茨鼓风机的研发

    Institute of Scientific and Technical Information of China (English)

    张海芹

    2013-01-01

      介绍了一种进气温度高达200℃的高温用途罗茨鼓风机,并着重阐述了机组的隔热结构设计、高温气体密封、降温设计和选用的隔热材料。通过对机组进行200℃高温性能试验,验证了机组性能满足工况要求。%This paper introduced a type of roots blower with inlet temperature up to 200℃ for high temperature application. And this paper focused on heat insulation design, high-temperature gas seal, cooling design and selection of heat insulation material of the unit. The unit performance meeting the operating requirement was verified based on the 200℃ high temperature performance test for the unit.

  16. Effectiveness of mist-blower applications of malathion and permethrin to foliage as barrier sprays for salt marsh mosquitoes.

    Science.gov (United States)

    Anderson, A L; Apperson, C S; Knake, R

    1991-03-01

    Permethrin and malathion were applied as salt marsh mosquito barrier sprays by mist-blower to the shrub border of a park. At one and 24 h after treatment, mosquito landing counts in both insecticide treated areas declined by 80-90% relative to counts in an untreated control area. After 48 h, in the malathion-treated area, mosquito activity returned to levels observed in the control area. From 2 to 8 days post-treatment, mosquito landing counts in the permethrin-treated area remained depressed and significantly (P less than 0.01) different from the malathion-treated and control areas. On days 9 and 10 post-treatment, mosquito landing rates returned to high levels in the insecticide-treated and control areas.

  17. 加热炉风机噪声特征及控制方法%Characteristics of noise from blower of reheating furnace and its control method

    Institute of Scientific and Technical Information of China (English)

    张天久; 丁岳明

    2011-01-01

    The noise coming from running blowers of the reheating furnace installed in the technical revamp of a specific mill severely contaminates the environments and hurts the health of the worker and staff.In light of the character of the noise from the blower of the reheating furnace a series counter measures have been taken such as installing a silencers at the inlet of the blower,improving the flexible link of the tuyeres,strengthening the stiffness of the blade of rotors,making proper balance between the dynamic and static status of the blade of rotors and checking and examining their vibration,controlling the value of vibration speed within the range of less than 5 mm/s,selecting proper sound insulation door and windows and wrapping the shell of the blower and network of tubes with selected sound absorb materials,well adjusting the wind blow rate,controlling the angle of the wind door and avoiding the abnormal noise from the ventilation system and mutation.By adoption of the above mentioned noise reduction measures the noise from the reheating furnace blowers has been lowered to about 78 db(A) from original 84 db(A),an average reduction of noise about 6 db(A),therefore the environmental conditions around the blower chamber have been greatly improved.%某厂在技术改造中所安装的加热炉风机运行时产生的噪声严重污染环境并有损职工健康。针对加热炉风机噪声特征,在风机进口处设计安装了阻性复合消声器,改进风口的软连接,增强转子叶轮刚度,做好转子叶轮的动静平衡及振动检测,把振动速度值控制在5 mm/s以下;选用隔声门和隔声窗并采用吸声材料包扎风机外壳和管网,调整风量,控制风门角度,避开通风系统异常噪声及突变。实施一系列降噪措施后使加热炉风机的噪声从84 dB(A)左右降低到78 dB(A)左右,平均降低了6 dB(A),使风机室周边环境得到了改善。

  18. German blowers for the world. Hidden champion: Ziehl-Abegg; Deutsche Ventilatoren fuer die ganze Welt. 'Hidden Champion: Ziehl-Abegg

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2002-05-01

    In the past 5 years, Ziehl-Abegg increased their exports to 60 percent, especially in the field of ventilation and blowers. [German] In den vergangenen 5 Jahren hat sich der Exportanteil bei Ziehl-Abegg auf 60 Prozent erhoeht. Hauptanteil daran hat die Lueftungstechnik, wozu auch Ventilatoren fuer kaelte- und klimatechnische Anwendungen zaehlen. Und obwohl das Familienunternehmen heute im Weltmarkt zur Spitze zaehlt, wurde bislang kein grosses Aufheben darum gemacht. (orig.)

  19. Novel geometry for rotor and casing. Radial blowers of the drum rotor type; Neuartige Laufrad- und Gehaeusegeometrie. Radialventilatoren in Trommellaeufer-Bauweise

    Energy Technology Data Exchange (ETDEWEB)

    Riedel, Hans Jochen [YOCIEL Klimatechnik, Leipzig (Germany)

    2008-11-15

    In blowers with drum rotors, i.e. with forward-curved blades, much energy is consumed for raising the internal air flow rate, and they are not efficient in converting this high velocity into static pressure. This was the starting point for new research whose results are presented here. Modifications of the rotor and casing geometry reduced the internal air flow rate and resulted in higher static pressure gradients, lower energy consumption, and also lower noise. (orig.)

  20. Detailed noise propagation of blower-ventilated liquefiers/recirculation coolers installed outside; Detaillierte Schallausbreitung von ventilatorbeluefteten Verfluessigern / Rueckkuehlern bei Aussenaufstellung

    Energy Technology Data Exchange (ETDEWEB)

    Roth, P. [Guentner AG und Co. KG, Fuerstenfeldbruck (Germany). Abt. Versuch

    2006-07-01

    Experimentally identified and parametrized noise pressure level distributions (Goldemund (1)) of outdoor heat exchangers with blowers provide a new and detailed basis for nose emissions planning. Inhomogeneous noise emission characteristics were not known before; they often caused noise emissions exceeding limiting values even though the noise calculations for the plants had been correct. Using selected examples, it is shown how spatially resolved noise pressure level distributions can help optimize both the type and number of units and their site and positioning. (orig.)

  1. EC technology for blower drives. Maximum efficiency across the whole speed range; EC-Technik fuer Ventilator- und Geblaeseantriebe. Hoechste Wirkungsgrade im gesamten Drehzahlbereich

    Energy Technology Data Exchange (ETDEWEB)

    Sauer, T. [ebm-papst Mulfingen GmbH und Co. KG, Mulfingen (Germany)

    2006-03-15

    Blowers are often powered by rotary-current asynchronous motors with short-circuit rotors, which are robust, simple and reliable. Today, specifications have become more demanding. For example, economic efficiency and low noise - combined with speed control which again should be as simple as possible - are now required. Asynchronous motors are hardly capable of meeting these requirements, so they are being replaced in many applications by electronically commuted permanent magnet motors, so-called EC drives. (orig.)

  2. Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser (Noise Reduction by means of Small Groove Located at LSD Blade Leading Tip)

    Institute of Scientific and Technical Information of China (English)

    Tengen MURAKAMI; Masahiro ISHIDA; Daisaku SAKAGUCHI; Yu KOBA

    2009-01-01

    This paper deals with the effect of the blade tip-groove of the low solidity cascade diffuser (LSD) on the blower characteristic and the noise generated by the LSD. The small grooves were set up at the root and/or tip near the leading edge of the LSD blade. In order to clarify the mechanism of noise increase due to LSD and also to reduce the noise, the relationships between the noise increase based on the LSD, the LSD performance and the secondary flow formed additionally by the tip-groove were investigated experimentally as well as numerically, especially analyzing flow behaviors in the LSD in view points of flow separation on the suction surface of the LSD blade and the secondary flow on the side walls. By reducing the stagnation region smaller near the root and/or tip of the LSD blade leading edge, the secondary flow behavior changes remarkably around the LSD blade, as a result, the noise level and the blower characteristics vary. It can be concluded that, by means of a small tip-groove located only at the shroud side near the LSD blade leading edge, the noise generated by the LSD can be reduced without deteriorations of the LSD performance and the blower characteristics as well.

  3. Optimization in the design and efficiency of retractable soot blowers; Optimacion del diseno y la eficiencia de sopladores de hollin retractiles

    Energy Technology Data Exchange (ETDEWEB)

    Diego Marin, Antonio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    In this article the importance of soot blowers in the subject of design, operation and maintenance are described and the effects that its inefficient functioning causes in the steam generators. The activities and the results of a project for the evaluation of the functioning of the soot blowers in the Comision Federal de Electricidad (CFE) boilers. Finally, the scope of a new project oriented towards the retractable soot blowers efficiency optimization, and to the creation of the infra-structure to substitute the import of its components. [Espanol] En este articulo se describe la importancia de los sopladores de hollin en los aspectos de diseno, operacion y mantenimiento, y los efectos que su funcionamiento deficiente produce en los generadores de vapor. Se presentan tambien las actividades y los resultados de un proyecto para evaluar el funcionamiento de los deshollinadores de las calderas de la Comision Federal de Electricidad (CFE). Finalmente, se presenta el alcance de un nuevo proyecto que se orienta a optimar la eficiencia de los sopladores de hollin retractiles y a crear la infraestructura para sustituir las importaciones de sus componentes.

  4. 燃煤炉鼓风机中变频器的节能分析%Energy conservation analysis of the inverter in coal-fired furnace blower

    Institute of Scientific and Technical Information of China (English)

    武欣

    2011-01-01

    In order to lower the power consumption rate of coal-fired furnace blower, to reduce the starting current, to increase the power factor, and to improve the fireman's working intensity, frequency converter was proposed to be used in coal-fired furnace blower. Compared to the traditional coal-fired furnace blower system,this system used converter to control the flow (air volume), which could save a lot of power. Through a detailed analysis of the pressure H-flow Q curve, it is clear that after the frequency conversion, the required power of blower is reduced. Meanwhile, the soft-start function of the converter and the feature of smooth speed governing could realized the smooth adjustment of the system,which made the system worked stable and extended the service life of various components of the boiler. Finally, the practice data shows it is energy-efficient to use the frequency converter in coal-fired furnace blower.%为了降低燃煤炉鼓风机的用电率、减少起动电流、提高功率因数、改善司炉工工作强度,提出了将变频器用在燃煤炉鼓风机中.与传统的燃煤炉鼓风机系统相比较,该系统利用变频器进行流量(风量)控制时,可节约大量电能.通过详细分析压力H-流量Q曲线,得出变频调速后风机所需功率明显减少.同时,变频器的软启动功能和平滑调速的特点可实现对系统的平稳调节,使系统工作状态稳定,延长锅炉各部件的使用寿命.最后通过实际数据可知使用变频器后的燃煤炉鼓风机是节能的.

  5. State and heat up of the gas in regenerative blowers; Zustandsaenderung und Aufheizung des Gases in Seitenkanalverdichtern

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany); Galinsky, H. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany)

    1995-05-01

    Regenerative blowers have thermical loads in spite of their low pressure ratio. On the basis of the compression-end temperature the machine load are increased. An increasing machine temperature heat up of the gas at the input in the machine, which influences the energy transfer. The results of practical investigations have shown that the heating-up process in the entering part of the side channel and in the front part are so that the energy transfer will have many loses. Among these are very high polytropic exponents with high pressure ratio in the particle load, which increase the heat transfer to the gas and lower the efficiency of the machine. (orig.) [Deutsch] Seitenkanalverdichter unterliegen trotz ihrer geringen Druckverhaeltnisse im Teillastbereich erheblichen thermischen Belastungen. Dadurch steigt nicht nur die Verdichtungsendtemperatur und die Maschinenbelastung, sondern mit steigender Maschinentemperatur erfolgt auch eine erhebliche Aufheizung des Gases bereits im Eintrittsbereich, wodurch die Arbeitsuebertragung beeinflusst wird. Die Resultate experimenteller Untersuchungen zeigen, dass die Aufheizung des Gases besonders im Eintrittsbereich des Seitenkanals erfolgt und dadurch die Arbeitsuebertragung im vorderen Bereich stark verlustbehaftet erfolgt. Die Folge davon sind sehr hohe Polytropenexponenten bei grossen Druckverhaeltnissen im Teillastbereich, die zu einer grossen Waermezufuhr an das Gas fuehren und den Wirkungsgrad der Maschinen mindern. (orig.)

  6. Design instructions for condensers and recirculation coolers with axial blowers; Auslegungshinweis fuer Verfluessiger und Rueckkuehler mit Axialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Handschuh, R. [Hans Guentner GmbH, Fuerstenfeldbruck (Germany)

    2003-07-01

    Apart from an explanation of the selectrion criteria for condensers and recirculation coolers with axial blowers for outside installation, information is presented on sound propagation. Selection according to the condensing capacity O{sub c}, the recooling rate Q{sub H} and the available floor space can be made with the aid of the Guentner Product Calculator GPC. Permissible noise emissions and adjacent installation of condensers and recoolers are gone into as well as noise propagation as a function of external noise, noise direction, noise reflection, the number of noise sources, the distance of the noise source from the emission point, and possible noise abatement factors are gone into as well. (orig.) [German] Neben der Erlaeuterung der Auswahlkriterien fuer Verfluessiger und Rueckkuehler mit Axialventilatoren zur Aufstellung im Freien werden Hinweise fuer die Schallausbreitung gegeben. Die Auswahl nach der Verfluessigungsleistung Q{sub c} bzw. der Rueckkuehlleistung Q{sub H} und der vorhandenen Aufstellflaeche kann mit dem Guentner Product Calculator GPC geschehen. Es wird auf die zulaessige Geraeuschimmission auf die Nachbarschaft von Verfluessigern und Rueckkuehlern eingegangen und deren Schallausbreitung in Abhaengigkeit von Fremdgeraeuscheinwirkungen, Schallrichtwirkung, der Schallreflexion, der Anzahl der Schallquellen, der Entfernung der Schallquelle zur Emissionsstelle und moegliche Daempfungen betrachtet. (orig.)

  7. Optimal DO Setpoint Decision and Electric Cost Saving in Aerobic Reactor Using Respirometer and Air Blower Control

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kwang Su; Yoo, Changkyoo [Kyung Hee University, Yongin (Korea, Republic of); Kim, Minhan [Pangaea21 Ltd., Seongnam (Korea, Republic of); Kim, Jongrack [UnUsoft Ltd., Seoul (Korea, Republic of)

    2014-10-15

    Main objects for wastewater treatment operation are to maintain effluent water quality and minimize operation cost. However, the optimal operation is difficult because of the change of influent flow rate and concentrations, the nonlinear dynamics of microbiology growth rate and other environmental factors. Therefore, many wastewater treatment plants are operated for much more redundant oxygen or chemical dosing than the necessary. In this study, the optimal control scheme for dissolved oxygen (DO) is suggested to prevent over-aeration and the reduction of the electric cost in plant operation while maintaining the dissolved oxygen (DO) concentration for the metabolism of microorganisms in oxic reactor. The oxygen uptake rate (OUR) is real-time measured for the identification of influent characterization and the identification of microorganisms' oxygen requirement in oxic reactor. Optimal DO set-point needed for the micro-organism is suggested based on real-time measurement of oxygen uptake of micro-organism and the control of air blower. Therefore, both stable effluent quality and minimization of electric cost are satisfied with a suggested optimal set-point decision system by providing the necessary oxygen supply requirement to the micro-organisms coping with the variations of influent loading.

  8. Water lance blowers for the cleaning of membrane walls of a 600 MW lignite-fired steam generator; Wasserlanzenblaeser zur Abreinigung von Membranwaenden eines 600-MW-Braunkohledampferzeugers. Betriebserfahrungen

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, J. [RWE Rheinbraun AG, Kraftwerk Weisweiler (Germany)

    2000-07-01

    The optimal heat absorption in the area of the combustion chamber is not only a prerequisite to attain the designed plant efficiency, but by its direct influence on the combustion chamber temperature also a measure for the further pollution of the subsequent convection heating surfaces. This paper describes the operating experience on cleaning of the combustion chamber water lance blowers and compares the cleaning effect of water lance blowers with the cleaning effect of the so far used water blowers. (orig.) [German] Die optimale Waermeaufnahme des Verdampfers im Bereich des Feuerraumes ist nicht nur eine Voraussetzung fuer das Erreichen des ausgelegten Anlagenwirkungsgrades, sondern durch den direkten Einfluss auf die Feuerraumendtemperatur auch ein Mass fuer die weitere Heizflaechenverschmutzung der nachfolgenden Konvektionsheizflaechen. Im vorliegenden Beitrag werden die Betriebserfahrungen bei der Abreinigung des Feuerraumes mittels Wasserlanzenblaeser dargestellt und die Reinigungswirkung der Wasserlanzenblaeser mit der Reinigungswirkung der bisher eingesetzen Wasserblaeser verglichen. (orig.)

  9. Selection of optimum blowers is higly important for energy conservation in ventilation and air conditioning engineering: High-performance radial blowers without a housing; Auswahl des optimalen Ventilators fuer Energieeinsparung in der Luft- und Klimatechnik von grosser Bedeutung: Hochleistungs-Radialventilatoren ohne Gehaeuse

    Energy Technology Data Exchange (ETDEWEB)

    Lexis, J. [Ingenieurbuero Beratung und Planung Luft- und Klimatechnik, Feucht bei Nuernberg (Germany)

    1998-12-01

    There isn`t another component in ventilation and air-conditioning whose choice can result in as much energy conservation as the choice of the optimum blower. Awareness of this fact is increasing. (orig.) [Deutsch] Mit keiner anderen Komponente in der Luft- und Klimatechnik kann so viel Energie gespart werden wie mit der Auswahl des optimalen Ventilators. Deshalb wird der Auswahl des Ventilators immer mehr Aufmerksamkeit geschenkt. (orig.)

  10. Turbulent vortex-flow and dynamic pressure oscillations in regenerative blowers; Turbulente Wirbelstroemung und dynamische Druckschwankungen in Seitenkanalmaschinen

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany)

    1997-05-01

    Regenerative blowers with high pressure coefficients have high dissipation losses in the side channel and on the breaker. These losses can be in the same magnitude as the polytropic specific head. The cause of the high specific dissipation energy is the turbulent vortex flow in the side channel, which is released by the high numbers of blades and restrict the polytropic efficiency by {eta}=0.46 to 0.50. The enforced turbulent vortex-flow is the reason for the high head coefficients of regenerative blowers. In the side channel, pressure pulsations occur with pressure amplitudes of high frequency up to 40 kHz. These dynamic pressure oscillations are the result of the turbulent vortex-flow. They are indicated from the edge of the impeller blades and the impeller flow in the side channel. For instance, for one rotation of the impeller t=0.02 s and the time between two blades t=0.35 ms. The analysis of the dynamic pressure shows a distribution of the amplitudes over a wide area up to 10 kHz and higher. The dominant amplitudes are the amplitude of blade rotation frequency. The forced turbulent vortex-flow causes a high turbulent vortex-viscosity in the flow and releases a pulse-flow transportation in the side channel. This is the reason for the energy transfer and the increase of the specific dissipation energy in the side channel. With knowledge of the specific pulse-flow transportation of the turbulent vortex-flow the connection to the total transmitted enthalpy can be explained. (orig.) [Deutsch] In Seitenkanalmaschinen mit den grossen Druckzahlen treten hohe Dissipationsverluste im Seitenkanal und im Unterbrecher auf, die von der gleichen Groessenordnung sein koennen wie die polytrope spezifische Nutzarbeit. Die Ursache fuer den grossen spezifischen Dissipationsenergieanteil ist in der turbulenten Wirbelstroemung im Seitenkanal zu suchen, die von den Laufradschaufeln hoher Zahl ausgeloest wird und den Wirkungsgrad der Maschinen auf Werte von {eta}=0,46... 0

  11. Convective blower and radiator in a single unit: Heating and air conditioning; Geblaesekonvektor und Radiator in einem Geraet: Heizen und Klimatisieren

    Energy Technology Data Exchange (ETDEWEB)

    Steenheuer, H. [Ingenieurbuero Dohrmann, Essen (Germany); Schulz, A. [Axair GmbH, Garching-Hochbrueck (Germany)

    2005-03-01

    Auxiliary cooling of a building is often a question of money. There is a trend to dual-function units. With a central units and convective blowers, i.e. a combination of heat exchanger and heating radiator, air conditioning of rooms is possible in all seasons. [German] Haeufig ist die zusaetzliche Kuehlung von Gebaeuden eine Frage des Geldes. Deshalb geht der Trend immer mehr zu Produkten, die beides ermoeglichen. Mit Zentraleinheit und Geblaesekonvektoren - eine Kombination von Waermetauscher und Heizradiator - koennen Raeume ganzjaehrig klimatisiert werden.

  12. 矿井风机温度的实时采集与控制系统%Real-time acquisition and control system of mine air blower temperature

    Institute of Scientific and Technical Information of China (English)

    王利伟; 王大虎; 查小菲

    2011-01-01

    Air blower is one of the most important equipments for the safety in mine production.Based on the working condition of air blower,AT89C52 single chip microcomputer,the labview roller temperature of blower and the design scheme of online monitor and control system of motors' winding temp,hardware and software configuration of the system and each application function module have been introduced in this article.The collection,processing,presentation,record and early warning of data of mine air blowers' signal can be realized through labview the platform.Through a good labview man-machine interface,operators can demonstrate the dynamically-monitored real-time data and the changing state of parameters.This system can be used into the design of digital measure scope owes to its high stability,high precision and accuracy and provides a new intellectualized manner to test the malfunctions of mine air blowers.%防爆通风机是煤矿安全生产的重要设备,针对矿井通风机的工作状态,提出基于AT89C52单片机、LabView的风机轴温、电动机绕组温度的实时监测与控制的设计方案,并给出系统总体结构,系统软硬件结构和各应用功能模块.通过LabView平台,实现对矿井风机信号的数据采集、处理、显示、记录和报警等功能.利用LabView良好的人机交互界面,可方便工作人员实时得到所检测到的实时数据、参数变化状态.该系统稳定可靠、精度高、准确性好,可用于全数字化检测仪的设计中,为风机故障检测提供了一种新的智能化手段.

  13. 鼓风机轴断裂失效分析%Fracture failure analysis of blower shaft

    Institute of Scientific and Technical Information of China (English)

    王若民; 陈国宏; 施鹏; 缪春辉

    2016-01-01

    In order to find out the fracture reason of the imported blower shaft in a thermal power generating unit, methods of macro-observation, chemical composition analysis, metallographic examination, spectrum analysis, mechanical properties test and microhardness test were used to analyze the failure shaft. The results show that the main reason for the high cycle fatigue fracture of the shaft is due to abnormal secondary quenching, which results in the generation of harmful microstructure such as hardy and brittle quenched martensite and massive soft ferrite along the shaft neck.%针对某火力发电机组进口鼓风机主轴断裂问题,采用宏观断口分析、化学成分分析、金相分析、能谱分析、力学性能和显微硬度检测等手段对其断裂原因进行了分析。结果表明:轴断裂的主要原因是由于异常的二次淬火导致轴颈基体表面形成硬而脆的粗大淬火马氏体和软化的块状铁素体等不良组织,降低了轴颈处的抗疲劳性能,运行过程中在高周交变应力作用下发生疲劳断裂。

  14. Reason Analysis on Fracture of a Blower Coupling%风机联轴器断裂原因分析

    Institute of Scientific and Technical Information of China (English)

    张琴; 李锁才; 岳苗; 张蔓

    2012-01-01

    A membrane blower coupling fractured during the trial operation. Means such as macro examination, metallographic examination, chemical compositions analysis, and mechanical properties test were used to analyze fracture reason of the coupling. The results show that overheated microstructure caused by unsuitable heal treatment was the main reason for the frcature, which resulted in poor toughness of the coupling. And the stress wits not released in time by annealing. Finally early brittle fracture of the coupling occurred in service. Aloe, quenching and tempering treatment to the fractured coupling, the impact toughness wits greatly improved, and the comprehensive mechanical properties of the coupling were excellent.%某风机在试运行过程中其膜片联轴器发生断裂失效,采用宏观分析、金相检验、化学成分分析和力学性能测试等方法对联轴器的断裂原因进行了分析。结果表明:该联轴器发生断裂主要是由于联轴器锻造后热处理不当,形成过热组织缺陷,从而导致其韧性极差;另一方面是由于联轴器锻造后未进行退火处理,内应力未及时消除,最终导致其在使用过程中的应力作用下发生早期脆性断裂失效。对断裂的联轴器进行退火+调质处理,可使其韧性大幅度提高,得到优良的综合力学性能。

  15. 浅谈消防风机保护断路器的整定%Setting Research of Protection Circuit Breaker for Fire Fighting Blower

    Institute of Scientific and Technical Information of China (English)

    张振国

    2014-01-01

    The setting problems of corresponding-level protection circuit breaker and the upper-level protection circuit breaker were discussed in a fire fighting blower.Through an instance,it pointed out that the corresponding-level protection circuit breaker only need the short circuit protection setting,and the upper-level protection circuit breaker need the load protection.It could provide references for the designs of similar fire fighting blowers.%针对消防风机的本级保护断路器以及上一级保护断路器的整定问题进行了探讨。通过实例,指出消防风机的本级保护断路器只设短路保护,而上一级保护器需设过负荷保护,以期为类似消防风机设计提供参考。

  16. Axial blowers by Woods. Technical know-how for higher pressure and less kW. Axialventilatoren von Woods. Mit dem richtigen Dreh - hoher Druck, weniger kW

    Energy Technology Data Exchange (ETDEWEB)

    Schelhorn, W.

    1992-08-03

    The ventilation systems of the parking garages and high-rise parking lots of the new Munich airport were faced with a special challenge, owing to high pressures and a lack of blower space. The design and function of the systems are illustrated by diagrams. An intensive investigation of pressure conditions helped to find an energy-saving solution. (BWI).

  17. Renewal of the auxiliary blower system NAL 2m{times}2m transonic wind tunnel; 2m{times}2m sen`onsoku fudoyo hojo sofuki setsubi no koshin

    Energy Technology Data Exchange (ETDEWEB)

    Karasawa, T.; Suenaga, H.; Suzuki, M.; Komatsu, Y.; Toda, N. [National Aerospace Laboratory, Tokyo (Japan)

    1996-08-01

    This paper describes an outline of a replaced auxiliary blower system for NAL 2m{times}2m transonic wind tunnel, and effects of its renewal. Based on the guideline of renewal of facilities, the bleed air flow was controlled by the whole step stator blade control method of main body of the blower, and a blower with a capacity adjustment function was equipped. Downsizing was planned by adopting an accelerator and a drive motor having their rated maximum power of 8,000 kW, which increased the number of revolution to 1.5 times. The protective function for antisurging control of the blower was enhanced by the by-pass control valve, which provided the auxiliary function for the Mach number control. The new valve was downsized to 6/7 in the bore diameter due to the reduction of by-pass air flow compared with the previous valve. Results of the present renewal are as follows. By the function recovery, tests in the Mach number up to 1.4 can be conducted under the total pressure of collecting drum, 120 kPa. Furthermore, energy saving, automatic control of the Mach number, operation and monitoring by the centralized processing, and high efficiency of operation were achieved. 6 refs., 25 figs., 1 tab.

  18. Aerodynamic studies on auxiliary blades in rotors of specifically slow radial blowers; Aerodynamische Untersuchungen von Zwischenschaufeln in Laufraedern spezifisch langsamlaeufiger Radialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Basile, R.

    2002-07-01

    The influence of auxiliary blades in rotors of specifically slow radial blowers on the aerodynamic characteristics was investigated both numerically and experimentally for ten different rotor variants with different primary dimensions and with auxiliary blades. [German] In dieser Arbeit wird der Einfluss von Zwischenschaufeln in Laufraedern spezifisch langsamlaeufiger Radialventilatoren auf die aerodynamischen Kennwerte numerisch und experimentell untersucht. Hierzu werden zehn Laufradgrundvarianten ausgewaehlt, die sich in ihren Hauptabmessungen unterscheiden. In diese Grundvarianten werden Zwischenschaufeln eingesetzt. Die optimale Zwischenschaufelposition ist bei allen untersuchten Laufradvarianten immer mittig im Schaufelkanal. Die optimale Zwischenschaufellaenge ist von allen Geometrieparametern des Laufrades abhaengig. Als dominierender Parameter stellt sich jedoch die Hauptschaufelzahl heraus. Ausgehend von detaillierten Stromfelduntersuchungen wird zusaetzlich der Einfluss des Spaltmassenstroms auf die Stroemungsumlengung im Saugmundbereich untersucht. Auf der Basis der Minderleistungstheorie nach Pfleiderer werden die Minderleistungsfaktoren mit Hilfe numerischer Stromfelddaten fuer Laufraeder ohne und mit Zwischenschaufeln bestimmt. (orig.)

  19. Corrective Action Decision Document/Closure Report for Corrective Action Unit 559: T Tunnel Compressor/Blower Pad, Nevada Test Site

    Energy Technology Data Exchange (ETDEWEB)

    NSTec Environmental Restoration

    2010-03-15

    This Corrective Action Decision Document (CADD)/Closure Report (CR) was prepared by the Defense Threat Reduction Agency (DTRA) for Corrective Action Unit (CAU) 559, T-Tunnel Compressor/Blower Pad. This CADD/CR is consistent with the requirements of the Federal Facility Agreement and Consent Order (FFACO) agreed to by the State of Nevada, the U.S. Department of Energy, and the U.S. Department of Defense. Corrective Action Unit 559 is comprised of one Corrective Action Site (CAS): • 12-25-13, Oil Stained Soil and Concrete The purpose of this CADD/CR is to provide justification and documentation supporting the recommendation for closure in place with use restrictions for CAU 559.

  20. The influence of flow conditions on the wide-band noise of an axial blower; Der Einfluss der Zustroembedingungen auf das breitbandige Geraeusch eines Axialventilators

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, M.

    2006-07-01

    Blower noise is calculated using semi-empirical methods presented in the relevant literature, and the results are compared with measurements. The noise fractions of the various sources are calculated separately in this method, and the results are then put together, also spectrally. One focal aspect was the investigation of the mechanism ''interaction of fan blades with inflow turbulence'', which is a dominant noise mechanism even if the degree of turbulence is still relatively low. Hot wire measurements served to provide information on the characteristic turbulence parameters of different flow configurations towards the fan, which were used as input variables in the noise calculation methods. The forecasted spectral noise levels as well as the total noise levels were in satisfactory agreement with measurements for all flow configurations investigated. (orig.)

  1. A Study on Efficiency Improvement and Optimization of Operating Characteristics of Pulsed Co{sub 2} Laser System using 3 Electrode-type and Ring Blower

    Energy Technology Data Exchange (ETDEWEB)

    Kim, D. W.; Chung, H. J.; Park, S. J.; Lee, Y. S.; Lee, D. H.; Kim, H. J.; Cho, J. S. [Pusan National University (Korea)

    2000-07-01

    In this paper, it is purpose to develop a pulsed CO{sub 2} laser with stable output at pulse repetition rate range of 2 khz. We used a IGBT as a switching device. The laser cavity was fabricated as an axial and water cooled type. It was used a ring blower to increase a cooling effect. The laser performance characteristics as parameters, such as pulse repetition rate, gas pressure have been investigated. The experiment was done under 3 electrode-type instead of 2 electrode-type. To achieve 3 electrode-type, we used two pulse-transformers which is operated parallel. As a result, the maximum output was about 28 W at the total pressure of 20 Torr(the gas mixture CO{sub 2}:N{sub 2}:He=1:9:15 and the pulse repetition rate of 1300 Hz). (author). 7 refs., 5 figs.

  2. Alternating pressure on blades and acoustic emissions of an axial blower in turbulent flow; Schaufelwechseldruecke und Schallabstrahlung bei einem Axialventilator unter turbulenter Zustroemung

    Energy Technology Data Exchange (ETDEWEB)

    Stremel, M.

    2002-07-01

    Blower noise levels must be known already in the design stage. Simple models are unable to model details, e.g. transient forces on the blades or pressure variations at the blade surface caused by flow turbulence or by secondary effects. [German] Die Hersteller von Ventilatoren sind aufgrund gestiegener Anforderungen auf Auslegungsverfahren angewiesen, mit denen schon im Entwurfsstadium eine Aussage ueber das von einem Ventilator erzeugte Geraeusch getroffen werden kann. Bislang wird das abgestrahlte Geraeusch durch einfache Modelle abgeschaetzt und Details wie z.B. ein Geraeuschspektrum oft nicht wiedergegeben. Bei der Geraeuschentstehung an einem Ventilator sind die instationaeren Schaufelkraefte bzw. Oberflaechenwechseldruecke von besonderer Bedeutung. Bestimmt werden sie im wesentlichen durch den Einfluss der Zustroemturbulenz, Sekundaereffekte (wie z.B. bei der Kopfspaltstroemung), (orig.)

  3. Development of a low emission gas blower considering a two-component firing; Entwicklung eines emissionsarmen Gasgeblaesebrenners. Unter Beruecksichtigung der Zweistoff-Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Fuellemann, J. [Blue-Fan Waermetechnik AG, Mastrils (Switzerland)

    1997-11-01

    Through the NEFF supported development project, low nitrogen oxide gas blowers have been successfully developed, permitting realisation of the required low pollutant, largely combustion chamber independent combustion with waste gas recirculation inside the combustion head, up to an output of 700 kW. With the executed field systems it was verified that the values of the LRV92 are also reproducible in practice with the newly developed technique. (orig.) [Deutsch] Durch das NEFF-unterstuetzte Entwicklungsprojekt ist es gelungen, stickoxidarme Geblaesebrenner zu entwickeln, die es ermoeglichen, die gefordert schadstoffarme, weitgehend brennraumunabhaengige Verbrennung mit brennkopfinterner Abgasrezirkulation zu realisieren, und zwar bis zu einem Leistungsbereich von 700 kW. Mit den realisierten Feldanlagen konnte nachgewiesen werden, dass die Werte der LRV92 mit der neu entwickelten Technik auch in der Praxis immer reproduzierbar sind. (orig.)

  4. Low-volume application by mist-blower compared with conventional compression sprayer treatment of houses with residual pyrethroid to control the malaria vector Anopheles albimanus in Mexico.

    Science.gov (United States)

    Villarreal, C; Rodriguez, M H; Bown, D N; Arredondo-Jiménez, J I

    1995-04-01

    Village-scale trials were carried out in southern Mexico to compare the efficacy of indoor-spraying of the pyrethroid insecticide lambda-cyhalothrin applied either as low-volume (LV) aqueous emulsion or as wettable-powder (WP) aqueous suspension for residual control of the principal coastal malaria vector Anopheles albimanus. Three indoor spray rounds were conducted at 3-month intervals using back-pack mist-blowers to apply lambda-cyhalothrin 12.5 mg a.i./m2 by LV, whereas the WP was applied by conventional compression sprayer at a mean rate of 26.5 mg a.i./m2. Both treatments caused mosquito mortality indoors and outdoors (collected inside house curtains) as a result of contact with treated surfaces before and after feeding, but had no significant impact on overall population density of An. albimanus resting indoors or assessed by human bait collections. Contact bioassays showed that WP and LV treatments with lambda-cyhalothrin were effective for 12-20 weeks (> 75% mortality) without causing excito-repellency. Compared to the WP treatment (8 houses/man/day), LV treatment (25 houses/man/day) was more than 3 times quicker per house, potentially saving 68% of labour costs. This is offset, however, by the much lower unit price of a compression sprayer (e.g. Hudson 'X-pert' at US$120) than a mist-blower (e.g. 'Super Jolly' at US$350), and higher running costs for LV applications. It was calculated, therefore, that LV becomes more economical than WP after 18.8 treatments/100 houses/10 men at equivalent rates of application, or after 7.6 spray rounds with half-rate LV applications.

  5. Vibration analysis and online thermodynamic assessment of a turbo-blower turbine; Analisis de vibraciones y evaluacion termodinamica en linea de la turbina de un turbosoplador

    Energy Technology Data Exchange (ETDEWEB)

    Munoz Q, Rodolfo; Marino L, Carlos; Ramirez S, Jose A.; Rivera G, Juan J. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2007-11-15

    In this paper are presented the results of the analysis of dynamic and thermodynamic behavior analysis of a turbo-blower integrated by one 13,080 KW steam turbine and a blower with a flow of 131,520 ft{sup 3}/m, to determine the cause of the excessive wearing of the axial trust bearing of the steam turbine. The main cause of failure is the wearing and severe dirtiness of the turbine stages that contributes with an increment of the turbine axial load. The consequences of the turbine deterioration are: greater axial load due to the additional heating rotor (requires greater steam to generate the same power that in design conditions); turbine motive power reduction and the reduction of isentropic efficiency of the same, for similar average steam consumption between reference and test. Due to the former the turbine power represents a deviation of the 34.74% in Steam Specific Consumption (SSC). [Spanish] Se presenta los resultados del analisis del comportamiento dinamico y termodinamico de un turbosoplador integrado por una turbina de vapor de 13,080 KW y un soplador con un caudal de 131,520 pies{sup 3}/m, para determinar la causa del desgaste excesivo de la chumacera de empuje axial de la turbina de vapor. La causa principal de la falla es el desgaste y ensuciamiento severo de las etapas de la turbina que contribuye con un incremento de la carga axial de la turbina. Las consecuencias del deterioro de la turbina son: mayor carga axial debida al calentamiento adicional del rotor (requiere mayor vapor para generar la misma potencia que en condiciones de diseno); reduccion de la potencia motriz de la turbina y de la eficiencia isoentropica de las mismas, para un consumo de vapor promedio similar entre referencia y prueba. Debido a lo anterior la potencia de la turbina representa una desviacion del 34.74% en el Consumo Especifico de Vapor (CVE).

  6. Research of Performance Rapid Determination Method of the Forced Draught Blower in Power Plant%电站送风机性能的快捷测试方法

    Institute of Scientific and Technical Information of China (English)

    李斌; 李建锋; 王键; 吕俊复; 冷杰; 张全胜; 黄海涛

    2012-01-01

    为了降低风机性能试验的工作量,为电站锅炉运行人员提供一种较为准确的风机性能检测手段,提出了一种基于热力学原理的风机性能测试与计算方法.通过对某200MW机组送风机性能的快捷测试并与已有的风机性能试验报告结果相比较,新的方法具有较高的准确性,能够用来指导电厂锅炉操作人员的现场运行与燃烧调整.%In order to reducing the workload of performance test for the blower and to providing a more accurate performance measuring method of the blower for the operators of boiler unit, a fan performance testing and calculation method based on ther-modynamic principle was proposed. Through comparing the results of quick test using the new method on the blower of a 200MW unit and the results of the existing fan performance test report, the new method has high accuracy and can be used to guide the power plant boiler operators field operation and combustion adjustment.

  7. A contribution on the investigation of the dynamic behavior of rotating shafts with a Hybrid Magnetic Bearing Concept (HMBC) for blower application

    Energy Technology Data Exchange (ETDEWEB)

    Gronek, Martin, E-mail: MGronek@hs-zigr.d [HOCHSCHULE ZITTAU/GOERLITZ-University of Applied Sciences, Institute of Process Technology, Process Automation and Measuring Technology (IPM), Department Mechatronical Systems, Theodor-Koerner-Allee 16, 02763 Zittau (Germany); Rottenbach, Torsten; Worlitz, Frank [HOCHSCHULE ZITTAU/GOERLITZ-University of Applied Sciences, Institute of Process Technology, Process Automation and Measuring Technology (IPM), Department Mechatronical Systems, Theodor-Koerner-Allee 16, 02763 Zittau (Germany)

    2010-10-15

    Within a subproject of the RAPHAEL-Program, which was part of the 6th EURATOM Framework Program supervised by the European Commission, it was investigated whether the use of a Hybrid Magnetic Bearing Concept (HMBC) will be beneficial for a blower application. Within the RAPHAEL program, the subproject 'Component Development' is dealing with R and D of components of High Temperature Reactor Technology (HTR), where a major focus is on safety- and reliability-related issues. That implies special requirements for the support of high speed rotating shafts in HTR-Applications that only can be satisfied by using Active Magnetic Bearings (AMB). Regarding safety and competitiveness, AMBs are considered to be key components for the support of rotating HTR-components due to their technical features. AMBs are characterized by an electromagnetic actuator that is generating the bearing force depending on the clearance between stator and rotor, in which the rotor is levitated. Therefore an active control of the coil current is necessary. Furthermore, Touch Down Bearings (TDB) are needed to avoid damages in case of an emergency shut down or in case of energy supply losses. This contribution provides an internal insight on the advantages of a Hybrid Magnetic Bearing Concept that is characterized by a completely Active Magnetic Bearing-supported vertical arranged rotor and an additional permanent magnetic radial orientated bearing. One benefit of the HMBC is an additional radial guidance of the shaft that may reduce the loads while dropping into the Touch Down Bearings e.g. in case of energy supply losses of the AMBs. Reduced loads on the TDBs will increase their life cycle and the availability of the AMB supported component. The scope of this R and D-Project, which will be described more detailed in this contribution, includes: the analytical modeling and simulation of the dynamic behavior of the Hybrid Magnetic Bearing System; the modification of the completely AMB

  8. Vibration transmitted to operator’s back by machines with back-pack power unit: a case study on blower and spraying machines

    Directory of Open Access Journals (Sweden)

    Roberto Deboli

    2013-09-01

    Full Text Available To correctly evaluate the vibration transmitted to the operators, it is necessary to consider each body’s point interested by the vibratory stimulus produced by machines. All the body’s part in contact to the vibration, when a portable device with internal combustion engine is used, are: hands, back and shoulders. Some information for wholebody vibration are available in the ISO 2631-1997 standard, which otherwise refers to a seated operator. ‘C’ type standards for the vibration analysis exist for some portable machines with an internal combustion engine which is comprehensive in the machine (chainsaw, brush-cutter, blower. If the engine is not inside the machine, but it is on the operator’s back, ‘C’ type standards on vibration measurements are quite incomplete. The IMAMOTER institute of CNR, the DISAFA Department (University of Turin and the Occupational Medicine Department of the University of Catania started some tests to verify the vibration levels transmitted to an operator working with backed engine devices. Two machines have been examined: a blower and a spraying machine. Two operative conditions have been considered during all the tests: idling and full load. Three operators have been involved and each test has been repeated three times. The spraying machine has been tested both with the empty tank and with 10 litres of water, to simulate the load to be caused by the presence of liquid inside the tank. In this work the comfort condition of ISO 2631-1 standard was considered, using the frequency weighting Wc curve with the weighting factor 0.8 for X axis (back-ventral direction and the Wd curve for Y and Z axis (shoulder - shoulder and buttocks - head with weighting factors 0.5 and 0.4 (respectively for Y and Z axis. Data were examined using IBM SPSS Statistics 20 software package. The statistical analysis underlined that the running condition is the main factor to condition the vibration levels transmitted to the operator

  9. 组合式金属风叶制作精度的工艺保证%Manufacturing process precision assurance for combined type of metal blower fan

    Institute of Scientific and Technical Information of China (English)

    徐立华; 殷铭

    2013-01-01

    为满足风叶在高温环境下能正常工作并尽量减轻风叶负载重量,本文选用冷轧板ST14作为风叶材料并采用组合式结构;为满足静平衡指标,在套筒拉深件上先保留端面平面并冲出用于传递转矩的工艺方孔,在套筒侧孔冲裁模上采取凹模静止而让套筒随分度盘转动的措施,而等分精度由分度销和分度盘上的定位槽保证;在叶片与套筒的焊接工装中,选用了快速夹钳标准件,以简化模具结构、提高夹紧的可靠度和生产效率;在最终的检测环节,利用风叶重量轻的特点,以静平衡替代动平衡检测,在实际生产中收到了较好的效果.%In order to meet the normal working at high temperature and reduce the blower fan negative loading weight, the cold pressing board ST14 was selected as the blower fan material and the fan was of the combined structure. In order to meet the static balance indexes, on the sleeve drawing part, the end plane was preserved and the process square hole transmitting torque was punched. On the sleeve side-hole punching die, the measure was taken that the female die was static and the sleeve rotated with the divided circle. The divided precision was guaranteed with the divided pin and the location slot of the divided circle. In the welding frock of the blades and the sleeve, the standard parts were clamped rapidly one by one. Then the die structure was simplified. The clamping reliability and the production efficiency were improved. In the later detection unit, the dynamic balance was instead of the static balance because the fan blades weight was light In fact the good result was achieved.

  10. Start up partial nitrification at low temperature with a real-time control strategy based on blower frequency and pH.

    Science.gov (United States)

    Gu, Shengbo; Wang, Shuying; Yang, Qing; Yang, Pei; Peng, Yongzhen

    2012-05-01

    In this study, the performance of partial nitrification via nitrite at low temperature was investigated in a pilot-scale sequencing batch reactor (SBR) with a working volume of 7.0m(3). A novel real-time control strategy, based on blower frequency (BF) and pH, was designed and evaluated. The nitrogen break point (NBP) in the BF curve and the nitrate/nitrite apex point (NAP) in the pH curve were used to identify the endpoint of the aerobic and anoxic phases, respectively. The nitrite accumulation rate (NAR) rapidly increased from 19.8% to 90%. Partial nitrification was achieved at low temperature (11-16°C) in 40 days and was stably maintained for as long as 140 days by applying a real-time control strategy based on pH and BF. Fluorescence in situ hybirdization (FISH) results demonstrated that ammonia oxidation bacteria (AOB) had developed into the dominant nitrifying bacteria compared to nitrite oxidation bacteria (NOB) in the system.

  11. 鼓风机传动密封装置泄漏分析及对策%The Analysis and Countermeasures on the Leakage of Blower Drive Sealing Devices

    Institute of Scientific and Technical Information of China (English)

    程笃笃; 刘海燕; 黄姝; 蒋建国

    2016-01-01

    由于鼓风机叶轮的驱动是通过贯穿附件机匣内25齿轮轴内套齿带动作高速运转,因而构成了内外径通道.外由磁力密封装置封严,内由O形圈封严,在高转速过程中伴随着不同程度的振动、窜动、比压、摩擦发热等诸多因素影响,导致滑油泄漏故障频发.为此,针对原采用完全互换法安装存在的故障分析原因,寻求提高装配精度与零件制造精度的关系,改进了与常规不同的选配、修配和调整的工艺方法进行装配控制,对排除泄漏故障有重要意义.%The driver for the impellers of a blower is operated at a high speed by a 25-gear shaft in accessory machine. Hence, it forms the in-side-outer diameters channels. The blower drive is encapsulated by magnetic sealing device from outside and an O-ring from inside. Affect-ed by vibrations, shifts, specific pressure, frictional heat and other factors, the lubrication leakage and the blower drive sealing device often breaks down while working at high speed. Thus, this paper analyzes the problems employing the method of complete switching installation. This paper aims to explore the relations between the improvement of the assembly accuracy and the precision of manufacturing. It is be-lieved that adopting improved methods to control assembling can contribute to the precision of manufacturing. This is of important signifi-cance for eliminating leaking problems.

  12. When Whistle-blowers Become the Story: The Problem of the ‘Third Victim’; Comment on “Cultures of Silence and Cultures of Voice: The Role of Whistleblowing in Healthcare Organisations”

    Directory of Open Access Journals (Sweden)

    Justin Waring

    2016-02-01

    Full Text Available In the healthcare context, whistleblowing has come to the fore of political, professional and public attention in the wake of major service scandals and mounting evidence of the routine threats to safety that patients face in their care. This paper offers a commentary and wider contextualisation of Mannion and Davies, ‘Cultures of silence and cultures of voice: the role of whistleblowing in healthcare organisations.’ It argues that closer attention is needed to the way in which whistle-blowers can become the focus and victim of raising concerns and speaking up.

  13. When Whistle-blowers Become the Story: The Problem of the 'Third Victim': Comment on "Cultures of Silence and Cultures of Voice: The Role of Whistleblowing in Healthcare Organisations".

    Science.gov (United States)

    Waring, Justin

    2015-11-01

    In the healthcare context, whistleblowing has come to the fore of political, professional and public attention in the wake of major service scandals and mounting evidence of the routine threats to safety that patients face in their care. This paper offers a commentary and wider contextualisation of Mannion and Davies, 'Cultures of silence and cultures of voice: the role of whistleblowing in healthcare organisations.' It argues that closer attention is needed to the way in which whistle-blowers can become the focus and victim of raising concerns and speaking up.

  14. Noise control in air blower of laboratory ventilation system%实验室通风系统风机噪声的综合治理

    Institute of Scientific and Technical Information of China (English)

    盖磊; 周东

    2012-01-01

    实验室通风系统在保证良好的室内空气质量的同时,往往会带来一定程度的噪声污染.济南市供排水监测中心综合实验室通风系统对室外环境造成了严重的噪声污染.文章对该实验室通风系统的噪声特性进行了测试与分析,结果表明:位于室外屋顶的风机为主要噪声源;阐述了针对风机噪声采用综合运用隔声罩、阻抗式消声器和隔声包扎等治理措施;提出了使用计算机模拟的方法用于噪声治理措施的选择与评价.项目竣工后,其噪声污染已控制到国家允许标准以下.%Laboratory ventilation system can usually ensure good indoor air quality, but at the same time it often brings a certain degree of noise pollution. The laboratory ventilation system of Jinan Water and Waste Water Monitoring Center had polluted the environment seriously. In this paper, the noise from the laboratory ventilation system was tested and analyzed. The results showed that the air blower which was located on the roof was the main noise source. Then some corresponding control measures, such as installing acoustical enclosure, silencer and sound insulation enswathement, were put forward and implemented. It also used computer simulation methods for noise control measures in the selection and evaluation. As those measures were taken, the noise level at the boundary was reduced to the quality standard.

  15. Quantification of leakages and leakage pathways in wooden buildings. Part 2.: Manual for blower door measurements - advanced methods. Final report; Quantifizierung einzelner Leckagen und Leckagewege bei Gebaeuden in Holzbauart. T. 2: Handbuch zur Durchfuehrung von Blower Door-Messungen - Erweiterte Messmethoden. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Hall, M.; Geissler, A.; Hauser, G.

    2001-07-01

    The first part of the project investigated the limits of application of the Opening A Door, Adding A Hole, Guard Zone and Deduction methods in order to find out which of them is the most reliable in given circumstances. This involved comparative measurements in the roof section of a model building. The roof section was specially designed and constructed for this purpose. The second part of the investigations comprised in situ measurements using a prototype measuring system developed in an earlier project, which was further developed into a flexible system for quantification of random leakages also in corners and along edges. It can be used either as a double chamber or as a single chamber combined, e.g., with a blower door as compensating volume flow meter. The laboratory experiments were supplemented by field tests. [German] Fuer die Quantifizierung der Luftdichtheit einzelner Gebaeudebereiche werden im ersten Teil des Projektes zur Schaffung von soliden Grundlagen die bekannten Methoden Opening A Door, Adding A Hole, Guard Zone und Deduktion auf ihre Anwendungsgrenzen untersucht. Es wird erarbeitet, unter welchen Bedingungen mit welcher Methode die sichersten Ergebnisse erhalten werden. Hierfuer werden Vergleichsmessungen im Dachbereich eines Versuchsgebaeudes unter bekannten Randbedingungen durchgefuehrt. Um die Moeglichkeit zu haben, konkrete Randbedingungen einzustellen wurde das vorhandene Versuchshaus umgebaut bzw. erweitert. Ein neuer Dachaufbau wurde entsprechend den Anforderungen des Projektes konzipiert und errichtet. Die Leckagen von einzelnen Bauteilen sollen im zweiten Teil des Projektes mit Hilfe eines in situ-Messgeraetes quantifiziert werden. Ein Messsystem zur Bestimmung der Luftdichtheit von Bauteilen in situ wurde im Rahmen eines frueheren Forschungsvorhabens als Prototyp bereits entwickelt. Ausgehend von dem aelteren Prototypen wird in diesem Projekt ein flexibles Messsystem entwickelt, mit dem die Quantifizierung beliebiger einzelner Leckagen

  16. Blowers in practice. A manual for planners, constructors, and vocational training. 4. rev. and act. ed.; Ventilatoren in der Praxis. Das Handbuch fuer Planer, Anlagenbauer, Meister-, Techniker- und Ingenieurschulen

    Energy Technology Data Exchange (ETDEWEB)

    Lexis, J.

    2000-07-01

    The different specific properties and applications of radial blowers with and without casings, axial flow and cross-fow blowers are described with the aid of examples, comparisons and calculations. The book takes a practical attitude, i.e. theoretical elements like dimensionless characteristics are left out. The subject matter has been revised in consideration of the European standards (''EN''). [German] Dieses Handbuch dient dem planenden wie ausfuehrenden Lueftungs- und Klimaingenieur zur Loesung von ventilatortechnischen Problemstellungen. In einer praxisnahen Form sollen mit Hilfe von konkreten Beispielen, Gegenueberstellungen und Berechnungen die unterschiedlichen spezifischen Eigenschaften und Anwendungsgebiete von Radialventilatoren mit Gehaeuse, Radialventilatoren ohne Gehaeuse, Axial- und Querstromventilatoren aufgezeigt werden. Diese unterschiedlichen spezifischen Eigenschaften sind jedoch haeufig infolge zu theoretischer Behandlung dieser Thematik fuer den Klimaingenieur nicht leicht durchschaubar und bleiben daher vielfach unberuecksichtigt. Es wurde daher ganz bewusst auf die ansonsten in der Fachliteratur uebliche praxisfremde Darstellungsform dimensionsloser Kennlinien verzichtet. Vielen wertvollen Anregungen und Verbesserungsvorschlaegen folgend, wurden unter Beruecksichtigung der Europaeischen Normen ''EN'', die einzelnen Kapitel ergaenzt und ueberarbeitet. (orig.)

  17. Energy conservation in space HVAC systems. Selection of the optimum blower and use of EC motors with maximum efficiency; Energieeinsparung bei RLT-Anlagen. Wahl eines optimalen Ventilators und Einsatz von EC-Motoren mit hoechstem Wirkungsgrad

    Energy Technology Data Exchange (ETDEWEB)

    Albig, J. [Ziehl Abegg AG, Kuenzelsau (Germany)

    2003-08-01

    The contribution discusses the use of radial blowers in a central air conditioning unit, e.g. for supplying cold air to the freezers of a department store. The unit uses backward-curved, free blowers with direct drives and with EC external rotor motors. The motor works with electronic commutation and is connected to the 400 V three-phase current network together with a matched EC controller, with continuous adaptation of the rotational speed. [German] Der folgende Beitrag befasst sich mit der Anwendung von Radialventilatoren in einem Klimazentralgeraet (kurz RLT-Geraet). Dieses RLT-Geraet wird z.B. verwendet, um Geschaefte einer Kaufhaus-Kette fuer Tiefkuehlwaren mit klimatisierter Luft zu versorgen. Bei der ueberarbeiteten Konstruktion des RLT-Geraetes werden direkt angetriebene, freilaufende, rueckwaerts gekruemmte Ventilatoren mit EC-Aussenlaeufermotor verwendet. Der EC-Motor wird elektronisch kommutiert und zusammen mit dem abgestimmten EC-Controller am Drehstromnetz (400 Volt) betrieben. Er bietet die Moeglichkeit zur stufenlosen Drehzahlanpassung. (orig.)

  18. Wide band noise: Calculation of the wide-band aeroacoustic noise spectrum of axial blower rotors on the basis of flow field variables. With user info on the program 'SIBNOISE-AX'. Final report; Breitbandlaerm - Berechnung des breitbandigen aeroakustischen Geraeuschspektrums von Axialventilatorlaufraedern aus Stromfeldgroessen. Mit Benutzeranleitung zum Programm 'SIBNOISE-AX'. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Carolus, T.; Schneider, M.

    2002-10-01

    A computer program for predicting the wide-band noise spectrom of axial blower rotors from flow field variables was developed. First, a bibliographic search was carried out on current methods of noise prediction. The main input parameters of the selected methods were varied systematically in the sense of a sensitivity analysis in order to check the plausibility of the results and assess the accuracy required of the input parameters. The selected methods were implemented in a user-friendly PC program ('SIBNOISE-AX'). The methods and the computer program were tested using the example of two blowers, i.e. a low-pressure and a high-pressure axial blower. Both blowers were calculated without guide wheels as the research project focused on rotor wheel noise only. Aerodynamic and acoustic data were obtained in a standard test stand in order to provide a data base. Time-averaged flow fields in the rotor wheels were calculated using a commercial CFD code, and parameters like boundary layer thickness and relevant velocities in the blade region were derived which - in addition to simple estimates - were used as input parameters in the noise prediction methods. The results provided by the calculations differed depending on the method employed, but some methods provided results that were in good agreement with the measurements. Their accuracy was sufficient even when the input parameters were only estimated and could be improved further by using the numerically calculated flow field parameters. The research project was thus completed successfully.

  19. Construção e avaliação do desempenho de três abanadoras de sementes Construction and performance evaluation of three seed blowers

    Directory of Open Access Journals (Sweden)

    José G. da Silva

    2006-03-01

    Full Text Available Os métodos de trilhamento das plantas não proporcionam grãos limpos, em condições de serem comercializados, semeados ou armazenados. É necessário que passem por um processo de limpeza com o fim de eliminar os fragmentos dos próprios grãos, detritos vegetais, folhas e pedaços de hastes. Os processos comuns de limpeza são pouco eficientes e os mais sofisticados podem não estar ao alcance de pequenos produtores. Objetivou-se, com este trabalho, construir três abanadoras e avaliar seu desempenho em sementes de arroz. Uma abanadora é provida de ventilador acionado a pedal; a outra possui ventilador acionado por motor elétrico e a terceira possui ventilador e peneiras movimentados por motor elétrico. Foram abanadas sementes com diferentes teores de impureza e em diferentes taxas de alimentação das máquinas. As abanadoras apresentaram maior eficiência de limpeza nas sementes com menor teor de impureza e na menor taxa de alimentação das máquinas. A eficiência foi considerada adequada para as sementes que possuíam até 4% de impureza antes da abanação. Com 6% de impureza, as sementes devem ser abanadas por três vezes, para ficarem com menos de 1% de impureza. A perda de sementes pelas abanadoras foi desprezível.Usually, the available methods to trash cereal seeds do not provide a clean product, as required for commercialization, seeding and storage. For this purpose it is necessary to submit the seed lot to a cleaning process to eliminate grain fragments and other contaminants such as soil and plant particles. Common processing procedures are not efficient and other methods available, more sophisticated, are not economically suitable for small farmers. The objective of this study was to construct three different blowers and evaluate their performance on rice: one provided with a foot operated fan; a second with an electric fan; and a third with electric fan and screeners. Seed lots with different degrees of impurities and

  20. Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Blower-Door-Directed Infiltration Reduction Procedure, Field Test Implementation and Results

    Energy Technology Data Exchange (ETDEWEB)

    Gettings, M.B.

    2001-05-21

    A blower-door-directed infiltration retrofit procedure was field tested on 18 homes in south central Wisconsin. The procedure, developed by the Wisconsin Energy Conservation Corporation, includes recommended retrofit techniques as well as criteria for estimating the amount of cost-effective work to be performed on a house. A recommended expenditure level and target air leakage reduction, in air changes per hour at 50 Pascal (ACH50), are determined from the initial leakage rate measured. The procedure produced an average 16% reduction in air leakage rate. For the 7 houses recommended for retrofit, 89% of the targeted reductions were accomplished with 76% of the recommended expenditures. The average cost of retrofits per house was reduced by a factor of four compared with previous programs. The average payback period for recommended retrofits was 4.4 years, based on predicted energy savings computed from achieved air leakage reductions. Although exceptions occurred, the procedure's 8 ACH50 minimum initial leakage rate for advising retrofits to be performed appeared a good choice, based on cost-effective air leakage reduction. Houses with initial rates of 7 ACH50 or below consistently required substantially higher costs to achieve significant air leakage reductions. No statistically significant average annual energy savings was detected as a result of the infiltration retrofits. Average measured savings were -27 therm per year, indicating an increase in energy use, with a 90% confidence interval of 36 therm. Measured savings for individual houses varied widely in both positive and negative directions, indicating that factors not considered affected the results. Large individual confidence intervals indicate a need to increase the accuracy of such measurements as well as understand the factors which may cause such disparity. Recommendations for the procedure include more extensive training of retrofit crews, checks for minimum air exchange rates to insure air

  1. Study on Performance Improvement About Intake of Blast Furnace Blower Pipe Additional Honeycomb Screen%入口管段增设整流栅对高炉鼓风机性能的优化

    Institute of Scientific and Technical Information of China (English)

    梁高林; 刘振全; 杜彦蓉; 冯勇

    2013-01-01

    It was introduced blast furnace blower on type S entrance section , by increasing the gate , to sort out the fan flow field at the entrance , and the fan operation parameters were added after the rectification and in-situ measurement and calculation , the additional gate performance improvement of fan played a very positive role .%介绍了一种通过在高炉风机的S型入口段,增加整流栅,对风机入口流场进行梳理的方法,并对增设整流珊后的风机运行参数进行了现场测量与计算,得出了整流栅的增设对风机的性能的优化起到了很大的积极作用。

  2. Energy conservation and saving of materials by means of frequency control of blowers in the drying process of soap. Toerenregeling bij droger bespaart meer op grondstoffen dan op elektriciteit

    Energy Technology Data Exchange (ETDEWEB)

    Mezger, H.J. (Holec Systemen en Componenten BV, Hengelo (Netherlands))

    1992-07-01

    A fluidized-bed process is used in a Dutch soap factory to dry soap powder. By means of frequency control of the blower in the dryer a considerable amount of electricity can be saved. Frequency control also results in less loss of material during the start-up and stopping of the production process. The payback period of the frequency control systems is estimated at 1.5 year. Data are presented on the saving of electricity and on the saving of basic material. However, the frequency control system will not yet be implemented in the soap factory. First another drying technique (cooling by means of nitrogen, for which a fluidized-bed is not needed) will be tested. 4 figs., 2 tabs., 1 ref.

  3. Investigation of the application of noise abatement systems for reduction of blower noise in underground mines; Untersuchung der Einsatzmoeglichkeiten von Antischall-Anlagen zur Verringerung des tonalen Laerms von Hauptgrubenlueftern

    Energy Technology Data Exchange (ETDEWEB)

    Hansen, J. [Deutsche Montan Technologie GmbH, Essen (Germany). Car Synergies Div.

    2001-07-01

    Noise abatement in mine ventilation systems is investigated. The low-frequency blower components are to be removed, and a modal acoustic field is to be influenced by active noise abatement measures. The investigations show that good results can be achieved without additional internals or duct segments. [German] Die vorliegende Arbeit beschaeftigt sich mit der Einsatzmoeglichkeit von verschiedenen Antischalltechniken bei Hauptgrubenlueftern und Luttenventilatoren. Ziel dieser Arbeit ist es, die stoerenden tieffrequenten Komponenten eines Ventilators mit Hilfe der Antischalltechnik zu beseitigen und ein modales Schallfeld durch den gezielten Einsatz aktiver Laermminderung zu beeinflussen. Die Untersuchungen zeigen, dass sich ein modales Schallfeld mit Hilfe der Antischall-Technik wirksam bedaempfen laesst. Hierfuer sind keine zusaetzlichen Einbauten oder eine Segmentierung des Kanals erforderlich. (orig.)

  4. Influence of the helical impeller and the silencer within the scroll on performance and noise for multiblade blower; Tayoku sofuki no hane herikaruka oyobi shoon kiko naizoka ga seino to soon ni oyobosu eikyo

    Energy Technology Data Exchange (ETDEWEB)

    Yamazaki, S.; Hashimoto, K.; Fukasaku, Y. [Hitachi, Ltd., Tokyo (Japan)

    1996-10-25

    In this paper, the velocity distributions around the impeller of a multiblade blower and noise reduction by the silencer within the scroll are investigated. It is shown that the region of small meridian velocity Cm2 at the outlet of the impeller is about 40% of the blade width b2 due to the inclination of the main sow to the hub. It is also shown that the velocity fluctuations at the trailing edge of a blade are about 30% of the maximum velocity and that a silencer composed of sound-absorbing fiber and an air chamber within the scroll can reduce the specific sound level SLs by 2.5 dB. 10 refs., 14 figs.

  5. Application of Steam Soot Blower in the Water Cooled Walls of Pulverized Coal Boiler%蒸汽吹灰装置在煤粉锅炉水冷壁上的应用

    Institute of Scientific and Technical Information of China (English)

    赵华; 王菲

    2015-01-01

    主要介绍了马钢220 t/h锅炉蒸汽吹灰系统的设备特性及运行情况,分析了蒸汽吹灰器在运行中存在的问题以及解决措施,估算了蒸汽吹灰所带来的经济效益。%The equipment characteristics and operation state of the steam soot blowing system at the 220 t/h boiler of MaSteel are mainly introduced, problems in operation of the steam soot blower and solutions are analyzed and the economic benefit brought by the steam soot blowing is also estimated.

  6. Extension of the characteristic field - taking into account the influence of hub and casing boundary layers in characteristic field calculations for axial blowers. Final report; Kennfelderweiterung - Erfassung des Einflusses der Naben- und Gehaeusegrenzschichten zur Kennfeldberechnung von Axialventilatoren. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Rohdenburg, M.; Saathoff, H.

    2002-07-01

    Research of TU Brunswick University showed that the performance of single-stage axial blowers is influenced significantly by 3D loss while profile loss is insignificant. Calculation methods should take account of this fact. A characteristic field calculation method was therefore developed based on practical measurements and on a method presented in an earlier publication. New correlations for side wall boundary layer parameters for single-stage axial blowers could be established by this method. This provides a modified characteristic field method and new correlations for calculating characteristic fields with rotor adjustment angles of {+-}15 already in the design stage. The research project was concluded successfully. (orig.) [German] An der TU-Braunschweig in juengerer Zeit durchgefuehrte Forschungsarbeiten zeigen, dass das Betriebsverhalten von einstufigen Ventilatoren axialer Bauart erheblich von den 3D-Verlusten gepraegt wird, die Profilverluste dagegen nur eine kleine Rolle spielen. Ein Kennfeld-Nachrechnungsverfahren sollte daher neben den Profilgrenzschichten (2D-Verluste) auch die Naben- und Gehaeusegrenzschichten (3D-Verluste) in korrekter Weise beruecksichtigen. Zu dessen Entwicklung wurden Grenzschichtkenngroessen der Naben- und Gehaeusegrenzschichten von drei Versuchsventilatoren an einer Reihe von ausgewaehlten Betriebspunkten ermittelt. Bei den Messungen handelte es sich um Sonden- und Hitzdrahtmessungen in den Zu- und Nachlaeufen der Beschaufelungen und um Druckverteilungsmessungen im Gehaeusebereich oberhalb des Rotors; bei ebenfalls noetigen Berechnungen der Geschwindigkeitsverteilungen handelte es sich um einfache Rechnungen mit Hilfe der Gleichgewichtsbedingung. Das Kennlinienberechnungsverfahren wurde in Anlehnung an ein vorhandenes Verfahren aus der Literatur entwickelt. Aus den im Vorhaben gewonnenen Messergebnissen konnten neue Korrelationen der Seitenwandgrenzschichtparameter fuer einstufige Axialventilatoren abgeleitet werden. Damit steht

  7. Comparative assessment of power control of axial blowers for condensers and recirculation coolers: Phase control, frequency control, transformers, EC; Vergleich der Leistungsregelung von Axialventilatoren fuer Verfluessiger und Rueckkuehler: Phasenanschnittregler, Frequenzumformer, Transformatoren, EC Technik

    Energy Technology Data Exchange (ETDEWEB)

    Hubert, G. [Hans Guentner GmbH, Fuerstenfeldbruck (Germany)

    2003-07-01

    The currently available control technologies were compared. Power consumption and sound emission were measured and evaluated. The blower with asynchronous motor was operated with and without noise filter, transformer and electronic frequency inverter with sinus filter. The blower with electronically commuted d.c. motor had an integrated power electronics for direct variable-speed operation connected to the three-phase current network. The electric power consumption was measured at 7-100 percent of the air volume flow pumped by the condenser. This provides reliable data not only for rated operation but also across the whole range of air flow rates and enables a better comparison. The sound measurements also cover the whole range of air volume flow and comprise both the air and the controller noise. The summed-up sound pressure levels are compared. The results give planners and constructors valuable information for selecting the appropriate power control system. (orig.) [German] Die Vielfalt der eingesetzten Geraete fuer die Stetigregelung von Verfluessiger mit Axialventilatoren ist gross. Um klare Aussagen zu den jeweiligen Regelprinzipien zu gewinnen wurden die zur Zeit technisch verfuegbaren Loesungen im Versuch gegenuebergestellt. Die relevanten Groessen Leistungsaufnahme und Schallemission wurden messtechnisch ermittelt und ausgewertet. Der Ventilator mit Asynchron-Motor wurde vergleichsweise mit Phasenausschnitt ohne und mit Geraeuschfilter, Transformator und elektronischem Frequenzumformer mit Sinusfilter betrieben. Der Ventilator mit elektronisch kommutiertem Gleichstrommotor hatte eine integrierte Leistungselektronik, die den direkten Betrieb mit variabler Drehzahl am Drehstromnetz ermoeglicht. Gemessen wurden die elektrischen Aufnahmeleistungen im Bereich von 7 bis 100% des durch den Verfluessiger gefoerderten Luftvolumenstromes. So hat man fundierte Werte nicht nur im Nennbetriebspunkt sondern auch ueber den gesamten Luftfoerderbereich und kann sie

  8. 高炉鼓风脱湿系统的冷能分析及有效利用%Analysis and Effective Use of Cooling Energy in Blast Furnace Blower Dehumidifying System

    Institute of Scientific and Technical Information of China (English)

    杨东伟; 郁鸿凌; 管晨希; 肖博钧

    2012-01-01

    针对冷凝脱湿的特性,利用能效分析法、物料平衡法和热力平衡法建立了高炉鼓风系统冷能利用的分析模型.对某钢厂的高炉鼓风冷却脱湿系统的实际数据进行整理归纳并利用该模型进行计算分析,结果表明:该钢厂高炉鼓风脱湿系统的冷能利用不充分.为提高冷能利用,盛夏月份每日产生的22.56 T/h、10℃冷凝水量,经处理可以回收利用到单台冷冻机的冷凝器,降低冷凝器侧循环冷却水温度1℃,增强了冷凝器换热效果和制冷系统制冷量352 kW,提高了高炉鼓风脱湿系统的冷能效用.%According to the characters of condensing dehumidification, the energy efficiency method,material balance method and heat balance method were used to build an analytical model about the cascade use of cooling energy in blast furnace (BF) blower system. The actual data, which were collected from a steel-works, were settled and then analyzed by means of the analytical model. The results show that the cooling energy in the steel-works' BF blower dehumidifying system is not fully used. For better use,the condensed water,with a production rate of 22.56 tons an hour at 10 ℃ in July and August, can be used in the condenser of one refrigerator after water treatment, and lower the cooling water temperature by 1 ℃. Meanwhile, it can enhance heat transferring and increase the cooling energy of refrigerating system by 352 kW.

  9. R+D works for the further development of high temperature reactors. (1) Captive bearing experiments for active magnetic bearings. (2) Captive bearing test for HTR blowers. Final report 1.10.1983 - 31.3.1991; F+E-Arbeiten fuer die Weiterentwicklung von Hochtemperaturreaktoren. (1) Fanglagerversuche fuer aktive Magnetlager. (2) Fanglagertest fuer HTR-Geblaese. Abschlussbericht. 1.10.1983 - 31.3.1991

    Energy Technology Data Exchange (ETDEWEB)

    1991-03-14

    When using active magnetic bearings as blower shaft bearings, blower motors and bearings must be protected against mechanical damage in case of faults (example: total electrical supply failure due to the supply cables breaking). So-called captive bearings are provided, in order to be able to shut the blowers down safely in such faults. These captive bearings are roller bearings which are additionally fitted in the area of the blower shaft bearings, to prevent mechanical contact between the blower rotor and stator. As there was little experience available for the given boundary conditions, such as - speed, - acceleration, - bearing load, - bearing dimensions, - ambient conditions, appropriate development and tests had to be carried out. It was important to determine suitable captive bearings and the necessary ambient conditions, which will make it possible to support the failures of the magnetic bearings to be expected in 40 years` operation of the reactor without damage and to meet the requirements of the captive bearings. (orig./GL). [Deutsch] Beim Einsatz von aktiven Magnetlagern als Geblaesewellenlagerung sind Geblaesemotor und -lager vor mechanischer Schaedigung im Stoerfall (Beispiel: totaler Stromausfall durch Bruch der Versorgungskabel) zu schuetzen. Um bei derartigen Stoerfaellen die Geblaese sicher abfahren zu koennen, werden sogenannte Fanglager vorgesehen. Diese Fanglager sind Waelzlager, die im Bereich der Geblaesewellenlagerung zusaetzlich angebracht werden, um einen mechanischen Kontakt zwischen Geblaesemotor und -stator zu verhindern. Da fuer die vorgegebenen Randbedingungen, wie - Drehzahl, - Beschleunigung, - Lagerbelastung, - Lagerabmessungen, Umgebungsbedingungen nur geringe Erfahrungen vorlagen, mussten entsprechende Entwicklungen und Versuche durchgefuehrt werden. Hierbei galt es, geeignete Fanglager und die erforderlichen Umgebungsbedingungen zu ermitteln, die es ermoeglichen, die in 40 Betriebsjahren des Reaktors zu erwartenden Ausfaelle der

  10. 石家庄陕鼓2×40000m^3/h空分设备设计优化%Optimized design of Shijiazhuang Shaanxi Blower Group 2 ×40000m^3/h air separation plant

    Institute of Scientific and Technical Information of China (English)

    张岑; 卢子学

    2012-01-01

    At design stage of Shijiazhuang Shaanxi Blower Group 2 ×40000m^3/h air separation plants, it found unreasonable design in the nitrogen compression and supply system, air compressor vent silencer, and connection mode for feeding boosted air to plate-fin type heat exchanger, as well as the factors impairing stable and safe operation of the product continuous supply and air separation plant. Here, the optimization measures taken for the unreasonable factors are described, which puts a sound basis for stable run of the air separation plant.%在石家庄陕鼓2×40000m^3/h空分设备设计阶段,发现氮气压缩和供应系统、空压机放空消声器以及增压空气进板翅式换热器的连接方式设计不舍理,存在影响产品连续供应和空分设备稳定、安全运行的因素。介绍对这些不合理因素所采取的优化措施,为空分设备建成后稳定运行奠定基础。

  11. Comparative investigation of power control of axial blowers for liquefiers and recirculation coolers: Phase controller, frequency converter, transformers, EC technology; Vergleich der Leistungsregelung von Axialventilatoren fuer Verfluessiger und Rueckkuehler: Phasenanschnittregler, Frequenzumformer, Transformatoren, EC Technik

    Energy Technology Data Exchange (ETDEWEB)

    Hubert, G. [Hans Guentner GmbH, Fuerstenfeldbruck (Germany)

    2003-07-01

    Phase controllers are well suited for liquefaction pressure control, and energy savings are higher than with blower shut-off. They emit noise in the 300 Hz range and need an additional acoustic filter if noise reduction in part-load operation is required. Frequency controllers with all-terminal sinusoid filters have a higher saving potential at 40-80 percent of the volume flow as compared to phase controllers. Noise is significantly lower than in phase controllers, even with acoustic filters. The best performance was obtained with EC technology, which had the highest energy savings and noise levels similar to transformer control, which was hitherto considered to be the best option. (orig.) [German] Phasenanschnittregler sind zur Verfluessigungsdruckregelung gut geeignet und bieten ein groesseres Energieeinsparpotential als die Methode der Ventilatorabschaltung. Wenn die Schallreduzierung im Teillastbereich wichtig ist, sind sie wegen der stoerend wirkenden 300 Hz Tonanteilen nicht geeignet. Hier kann ein zusaetzlicher Geraeuschfilter groesstenteils Abhilfe schaffen. Frequenzregler mit allpoligem Sinusfilter haben deutliche Einsparpotentiale im Bereich von 40% bis 80% des Volumenstroms gegenueber den Phasenanschnittreglern. Die Schallreduzierung wirkt bis in die unteren Drehzahlbereiche und liegt deutlich unter den Werten der Phasenanschnittsteuerung mit Geraeuschfilter. Den hoechsten Gesamtwirkungsgrad ueber den ganzen Luftfoerderbereich liefert die getestete EC-Technik. In allen Betriebspunkten ist somit die hoechste Energieersparnis gegeben. Die Schallreduzierung ist gleichwertig mit den Ergebnissen der Transformatorregelung, die bisher als geraeuschlos bestes Verfahren eingesetzt wurde. (orig.)

  12. Gap modification improves blowers. Reducing the noise emission by reducing the energy consumption of axial flow machines. Spaltmodifikation verbessert Ventilatoren. Minderung der Schallemission bei Reduzierung des Energieverbrauchs axialer Stroemungsmaschinen

    Energy Technology Data Exchange (ETDEWEB)

    Kameier, F. (TU Berlin (Germany). Hermann-Foettinger Inst.); Neise, W. (DLR, Berlin (Germany). Abt. Turbulenzforschung)

    1994-08-01

    The article describes a design feature that can reduce the sound emission of axial flow machines by up to 11 dB (A) (specific sound level), whilst improving the efficiency by seven percentage points. This improvement can be carried out on equipment that is already in use, as well as on new design. The gap between the rotating blades and the fixed housing, causes losses and an increased sound emission in axial flow machines. The aerodynamic and acoustic effects of a variation in the gap has been extensively examined on a model of a high-pressure axial blower. The widest gap (0.5% of the impeller diameter) has been retroactively improved in design so that a reduction in the negative effect of the gap occurs whilst retaining its nominal size. The diameter of the impeller as well as that of the housing remain unchanged. The gap modification, for which a patent has been applied for, has the equivalent effect of halving the gap width. (orig.)

  13. Study on EHD blower for solar distillation system. Experimental results by use of air at room temperature and humidity; Taiyonetsu joryu system yo EHD soki sochi no kenkyu. Joon joshitsu kuki ni yoru jikken kekka

    Energy Technology Data Exchange (ETDEWEB)

    Tochitani, Y.; Matsuoka, H. [Kanazawa Institute of Technology, Ishikawa (Japan)

    1998-05-31

    Study was made on wet air circulating equipment between evaporating and condensing sections for a solar distillation system. Experiment was made on a blower directly converting electric energy to air energy using 1-12 needles as discharge electrode, and a metal pipe edge as collecting electrode. This blowing method is probably available enough for a solar distillation system. As fixed voltage is applied by several needles, a mean air velocity and flow rate in a pipe increase with the number of needles in a small gap length range between electrodes, and a flow rate reaches a peak regardless of further number of needles. As the same flow rate is obtained at the same gap length, applied voltage for 4 needles is lower (nearly 2/3 under a certain condition) than that for one needle. Under a condition of fixed power consumption, the flow rate reaches a peak at a specific gap length. A total pressure efficiency also reaches a peak (nearly 0.2%) at the same gap length between electrodes as the above gap length. 11 refs., 12 figs., 1 tab.

  14. 声波吹灰器在旋风炉脱硝改造中的应用%The Application of Sonic Soot-Blower in the Cyclone-type Boiler of Denitration Transformation

    Institute of Scientific and Technical Information of China (English)

    李晓贺; 徐欣欣

    2016-01-01

    介绍了天津大沽化工股份有限公司热电分厂130,t/h旋风炉经过烟气脱硝改造后,空气预热器出现大量积灰,管束堵塞非常严重,最终导致烟气阻力增大,严重影响了锅炉运行的安全性和经济性。通过在空气预热器加装声波吹灰器,空气预热器的积灰问题得到了有效解决,锅炉运行的安全性和经济效益得到了保证。%The 130,t/h cyclone-type boiler of Tianjin Dagu Chemical Co.,LTD.Thermal Power Plant,which after flue gas denitration transformation,in the process of running,has been found a large amount of ash accumulation in the air preheater,resulting in tube bundle,eventually led to increased flue gas resistance.It seriously affects the safety and econ-omy of boiler operation.By adding sound wave soot blower in air preheater,the fouling problem of air preheater has been effectively solved,the safety and economy of boiler operation are thus guaranteed.

  15. What matters 2013. Construction and housing: Homes of tomorrow and beyond. Noise: Leaf blowers and engines. Protection of the marine environment: A blue economy - Threat or opportunity for the oceans? Annual report of the Federal Environment Agency

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-11-01

    As of 2011, more people worldwide live in cities than in the country. The global consumption of resources, energy of heating, cooling or light, and daily environmental conditions such as air and noise pollution are very much characterised by the way we organise our cities. Although at the beginning of the industrial age, cities often were hostile, dirty and noisy places, they appealed greatly to the rural population. Today, the environmental quality of urban spaces in highly-developed countries has improved immensely. Hence, even in German, urban areas have been able to show a small population increase in the past few years. Under this aspect, the paper under consideration consists of the following contributions: (a) The EU and the two-degree limit (The many advantages of Germany's pioneering role); (b) Homes of tomorrow and beyond (A central sector for climate and site protection, the energy revolution and health); (c) Leaf blowers and engines (The struggle against noise pollution must include people); (d) A blue economy - threat or opportunity for the oceans? (Overfishing, enthrophication, contaminants and litter are threatening the oceans, but there are solutions); (e) Certificate for renewable energy (Te Federal Environment Agency's proof of origin); (f) On the gas trail (Our air monitoring network records air pollution, across borders and globally); (g) the environmental specimen bank (Environmental observation with samples from humans and the environment).

  16. 制浆造纸行业节能型真空系统--Ecopump节能透平机%An energy saving vacuum system for pulp and paper industry-Ecopump turbo blower

    Institute of Scientific and Technical Information of China (English)

    Juha Karvinen; 杨凤辉

    2014-01-01

    通过与制浆造纸行业现有的液环泵和单/多级透平风机两种真空系统进行比较,介绍了芬兰Ecopump节能透平机真空系统技术及其优势所在。Ecopump节能透平机可为纸机真空系统节能30%~70%,同时具有投资回报快、安装维护快且简单等特点。%Through the comparison with traditional liquid ring pump and single/multi staged turbo blower vacuum systems in pulp and paper industry, a revolutionary energy saving Ecopump Turbo vacuum system from Finland was introduced. By the way of demonstration of technical principles and successful references, Ecopump Turbo can save 30%-70%energy for paper machine vacuum system. At the same time, it has other advantages such as fast payback time, fast and easy installation and maintenance, etc.

  17. Application of high strength sonic soot blower in air preheater of 1 000 MW units%高强声波吹灰器在1000 MW机组空预器中的应用

    Institute of Scientific and Technical Information of China (English)

    李彦民; 王俊杰

    2016-01-01

    There are some problems existed in the running of air preheater in CLP vote of Henan Electric Power co. LTD. ,Pingdingshan Power 2 x 1 000 MW ultra supercritical units. The air preheater had a large amount of dust ,so the resistance increased which is one of the important reasons affecting the safe and economic opera-tion. The sonic soot blower is applied in air preheater to prevent the dust and its effect is analyzed. The practi-cal application results show that the efficient acoustic wave sootblower are deposited in the air preheater and has obvious effect, the safety benefit, economic benefit and social benefit are remarkable.%介绍了中电投河南电力有限公司平顶山发电分公司2×1000 MW超超临界机组空预器在运行中出现的大量积灰情况,空预器阻力的大幅增加是影响机组安全、经济运行的重要原因。分析通过空预器加装声波吹灰器后对防止空预器大量积灰的效果,根据实践应用结果表明,高效声波吹灰器对空预器积灰有明显效果,安全效益、经济效益及社会效益显著。

  18. Research of Digital Power Amplifier Simulation for High-power Blower with Active Magnetic Bearing%大功率磁悬浮鼓风机数字功放的仿真研究

    Institute of Scientific and Technical Information of China (English)

    于文涛; 刘淑琴

    2011-01-01

    High-power blower with active magnetic bearing (AMB) has advantages of small, high speed, high reliability, low noise, it uses three-level digital switching power amplifier base on field programmable gate array (FPGA). Using Matlab/Simulink power system blackset library to complete the model of half-bridge circuit and current sensing circuit, simulate the FPGA internal data processing by embedded M-function modules.The simulation and experimental results verify the correctness of this method of modeling.It provides a new accurate method for simulation of digital circuit power amplifier.%大功率磁悬浮轴承鼓风机具有体积小、转速高、可靠性高、噪音低等优点,其功率放大器采用基于现场可编程门阵列(FPGA)的三电平PWM数字功放,应用Matlab/Simulink中基于电力系统模块集库,完成数字功放电路中的半桥电路和电流采样电路的建模,通过植入M函数文件内嵌功能模块模拟了FPGA内部的数据处理流程.仿真与实验结果验证了该建模方法的正确性,为数字电路功放的仿真提供了新的准确方法.

  19. Jiaxiang’s Lusty Suona Blowers

    Institute of Scientific and Technical Information of China (English)

    1993-01-01

    JLAXLANG County,under thejurisdiction of Luoning.a prin-cipal city in southwesternShandong,bordering Q(?)fu andZoucheng,is one of the birth places of central Chinese culture.EasternHan Dynasty stone carvings on thetombs of the Wu family record theprosperity of Jiaxiang at that time.Most impressive are vivld deplctionsof suona(Chinese cornet)bands,highlighting Jiaxiang as the“homeof suona music.”

  20. Study on suppression acoustic resonance of interaction tones from a centrifugal motor blower. Modeling of phenomenon and proposal of suppression method; Enshingata sofuki ni okeru doseiyoku kansho ni kiin suru onkyoteki iyomei gensho no hasei genri to yokuseiho. Gensho no model ka to yokusei shuho no teian

    Energy Technology Data Exchange (ETDEWEB)

    Sugimura, K.; Watanabe, M. [Hitachi, Ltd., Tokyo (Japan)

    2000-10-25

    In a centrifugal blower with diffuser vanes, the noise level may unexpectedly increase at certain numbers of revolutions. In particular, the phenomenon of acoustic resonance due to aerodynamic interaction tones between the impeller and the diffuser is a serious problem. In this paper, we develop a physical model to describe this phenomenon. The model assumes that inner flow paths both in the impeller and the diffuser behave as quasi-one-dimensional acoustic tubes. We constructed a mathematical model to predict critical numbers of revolutions at which resonance occurs, and conducted experiments to verify the model, and the results agree well with the mathematical model. We also propose an effective method for suppressing the resonance in which diffuser vanes with slits are used. Each diffuser vane has a slit located just behind the end of the facing area between neighboring vanes. The location of the slit is determined by the mathematical model. Experiments show that the method successfully reduces keen noise by as much as 8 dB. (author)

  1. Numerical Research of the Solid and Liquid Two - Phase Flow Influence Factors in the Sand Blower of Horizontal Well%水平井喷砂器内固液两相流动影响因素数值研究

    Institute of Scientific and Technical Information of China (English)

    鹿钦礼; 乔伟彪; 刘帅; 冯云飞

    2012-01-01

    Based on the model of the CFD Eulerian, using the method of the limited volumetry, we build the mathematics model of the solid and liquid two - phase flow. And we simulate sand blower whose lenth is 180 millimeter, inlet radius diameter is 4 millimeter, outlet is annular and inner annular radius diameter is 7 millimeter, outer annular radius diameter is 9 millimeter numerically. Research indicates; under the circumstance of the other invariant condition, the fracturing liquid inlet velocity increasing, the energy of turbulence is lower in the direction of the roller, with the include sand ratio decreasing, the pressure of the fracturing liquid is added in the every faces; with the outlet pressure increasing, the flow velocity of the fracturing liquid is also amplified.%基于计算流体力学中的欧拉模型、采用有限客积法建立固液两相在喷砂器内流动的数学模型.针对总长为180mm,入口半径为4mm,出口为环形且内环半径为7mm、外环半径为9mm的喷砂器进行数值模拟.结果表明:在其它条件不变的情况下,随着压裂液入口速度的增加,轴向距离各截面的湍动能逐渐减少,随着舍沙率的减少,压裂液在各截面的压强逐渐增大,随着出口压力的增加,压裂液流动速度也在增大.

  2. How to Carry Out the Process of Servitization of Manufacturing: A Case Study of Xi'an Shangu Blower Group%装备制造业服务化过程及其保障因素——基于陕鼓集团的案例研究

    Institute of Scientific and Technical Information of China (English)

    赵勇; 齐讴歌; 曹林

    2012-01-01

    以陕西鼓风机集团作为研究对象,对中国装备制造业如何实施服务化战略进行了研究,特别关注服务化的驱动力、服务化过程以及服务化保障,初步构建了中国装备制造业服务化理论的基本分析框架:(1)中国装备制造业企业服务化的驱动力主要包括市场环境、高层管理者、顾客需求与参与;(2)装备制造业服务化过程中,呈现出较强的探索性特征,遵循着理念、战略、内容、流程的基本顺序以及目标定位、分析论证、内容设计和执行实施4个阶段;(3)服务化的保障主要包括公司战略、组织结构与技术研发等。%On the basis of the theoretical framework of the servitization of manufacturing, this article systemically studies the servitization practices of Shangu Blower, especially focus on the driving force, process and guarantee factors. Finally we get the conclusion of the servitization of manufacturing theory: (1) The driving forces of ser- vitization of manufacturing mainly include market environment, senior managers, customer demand and participa- tion; (2)the process of servitization of manufacturing, will follow the basic sequence of philosophy-strategy-con- tent-process, and certain development stages of objective orientation, analysis, design and implementation of imple- mentation, but this process showed a strong informal tendency; (3)The guarantee or support mechanisms of serviti- zation of manufacturing primarily consist of corporate strategy, organizational structure and Technology research and development.

  3. Value Co-creation Model in the Process of Service Transition of Manufacturing Enterprises from the Network Perspective:Research Based on the Shanxi Blower Case%网络视角下制造企业服务转型的价值共创模型--基于陕鼓的案例研究

    Institute of Scientific and Technical Information of China (English)

    冯长利; 刘洪涛

    2016-01-01

    陕西鼓风机(集团)有限公司服务转型的成功得益于价值创造方式的转变,其共创价值的理念引起了学者的广泛关注。文章运用价值创造理论和利益相关者理论,从网络视角构建了价值共创的概念模型,并结合陕鼓的案例分析,探究了制造企业服务转型中的价值共创机理。研究发现:随着服务转型的实施,价值共创的主体趋于多元化,传统企业与顾客间的双边交易行为被取代,价值创造由制造-服务集成商、专业服务提供商、顾客和潜在利益相关者四种主体交互实现。价值共创的资源趋于无形化,产品、设备等有形的对象性资源转变为价值载体,知识、关系、合法性等无形的操作性资源占据主导地位。价值共创的表现形式趋于多样化,顾客价值、企业价值和社会价值不再对立,而是相互协同、彼此共享从而共创价值的。%The success of service transition of Shanxi Blower (Group)can be attributed to the transformation of the conception of value creation,and its value co-creation is drawing increasing attention.In this paper,from the network perspective and based on the theories of value creation and stakeholder,a model is built to research on the mechanism of value co-creation in the process of service transition of manufacturing enterprises.Study suggests that actors of value co-creation tend to be diversified in the transition process.Value creation is no longer j ust a bilateral behavior between enterprises and customers,but interactions among four actors in the context of network. These four actors are manufacturing-service integrators,professional service providers,custom-ers and potential stakeholders.In addition,the resources tend to be intangible,not only operand resources,but also operant resources,such as knowledge,relationships and legitimacy.In the process of value co-creation,customer value,enterprise value,and social value are no

  4. Use of low temperature blowers for recirculation of hot gases

    Science.gov (United States)

    Maru, H.C.; Forooque, M.

    1982-08-19

    An apparatus is described for maintaining motors at low operating temperatures during recirculation of hot gases in fuel cell operations and chemical processes such as fluidized bed coal gasification. The apparatus includes a means for separating the hot process gas from the motor using a secondary lower temperature gas, thereby minimizing the temperature increase of the motor and associated accessories.

  5. Direct current blowers with a microprocessor; Gelijkstroomventilatoren met een microprocessor

    Energy Technology Data Exchange (ETDEWEB)

    Deltenre, B. [Auerhaan, Lelystad (Netherlands)

    2000-11-01

    For mechanical ventilation of a building energy is required in order to transport fresh air to the rooms. In principle this energy is completely consumed by friction, for example in the air ducting, and therefore can not be recovered. Some manufacturers have been looking into high efficiency fans in order to save as much energy as possible. One solution has been found in the form of direct-current motors directly connected to the fan shaft.

  6. The Sonic Soot-blower%声波吹灰器

    Institute of Scientific and Technical Information of China (English)

    赵旺初

    2000-01-01

    声波吹灰器在欧美和日本已得到广泛的应用,在我国属待推广的新技术.介绍了声波吹灰器优于传统吹灰器的机理、结构,进行了具体的经济和节能效果分析,并举例说明之.

  7. Development of Air-cooled Engines with Blower Cooling

    Science.gov (United States)

    Lohner, Kurt

    1933-01-01

    With the aid of a heating device, the heat transfer to cylinders with conical fins of various forms is determined both for shrouded and exposed cylinders. Simultaneously the pressure drop for overcoming the resistance to the motion of air between the fins of the enclosed cylinder is measured. Thus the relations between the heat transfer and the energy required for cooling are discovered. The investigations show that the heat transfer in a conducted air flow is much greater than in a free current and that further improvement, as compared with free exposure, is possible through narrower spaces between the fins.

  8. Sinus tachycardia: don't blame the whistle-blower.

    Science.gov (United States)

    De Pauw, Michel; Tromp, Fiona; De Buyzere, Marc

    2013-06-01

    Sinus tachycardia due to sympathetic activation may be the ultimate response to support cardiac output. Abrupt heart rate reduction in this condition may be deleterious as is illustrated by two cases. Both patients were referred in cardiogenic shock after inappropriate treatment with a beta-blocking agent, initiated as a symptomatic treatment of a sinus tachycardia.Thus even if beta-blocking agents provoked a paradigm shift in the understanding of heart failure and became a cornerstone of the treatment, therapy should be initiated with knowledge of the underlying condition.

  9. Blower door measurement: in spite of standardization a lot of uncertainties; Blower Door-Messungen: Trotz Normen noch vieles Unklar

    Energy Technology Data Exchange (ETDEWEB)

    Tanner, C.; Muehlebach, H. [Eidgenoessische Materialpruefungs- und Forschungsanstalt (EMPA), Abt. Bauphysik, Duebendorf (Switzerland)

    2004-06-01

    Meanwhile it is common knowledge that air tightness of a building envelope is a quality factor providing several advantages. Measurement, assessment and comparison of air permeability characteristics of buildings is far from being simple: on the one hand a variety of nationally defined non-compatible air permeability indices exist, on the other hand detailed regulations or instructions on the preparation of a building before measurement are missing in actual standards. For instance, the measuring zone is often not clearly defined, and the various options of tightening a mechanical ventilation system also yield large deviations in the results. Also the date of measurement has a substantial influence: a measurement with leakage detection in the construction phase is useful and desired for improvement. But it is not valid for approval since the building will be changed until completion. For those reasons questions arise about the value of the air permeability determination. In addition, regarding recent low energy labelling schemes demanding very low permeability rates for heat saving reasons, it is known nowadays that only a poor relation exists between the air exchange rate n{sub 50} and the actual ventilation heat loss of an occupied low energy building. Proposals for standardised procedures with regard to building preparation and data evaluation are being discussed these days. Objectives are to find simple, pragmatic solutions for the main problems and to make known more clearly the chances and limitations of the complex assessment method. (orig.) [German] Es ist unbestritten, dass eine moeglichst luftdichte Gebaeudehuelle ein Qualitaetsfaktor ist, der viele Vorteile bringt. Wird eine Luftdurchlaessigkeits-Messung durchgefuehrt, werden die Beurteilungen und Vergleiche von Luftwechselzahlen schwierig. Einerseits werden laenderspezifisch unterschiedliche Kennwerte ermittelt, andererseits fehlen in den Normen meist detaillierte Ausfuehrungsbestimmungen fuer die Gebaeudepraeparation. So besteht z. B. Spielraum beim Festlegen der Messzone und es entstehen - je nach Abdichtungsort bei der Lueftungsanlage - grosse Unterschiede im Ergebnis. Wesentlichen Einfluss hat auch der Messzeitpunkt: Eine Messung mit Leckagenortung in der Bauphase ist sinnvoll und erwuenscht, gilt aber nicht als Abnahme, da das Gebaeude durch die Fertigstellung noch veraendert wird. Das hinterlaesst Fragen ueber den Stellenwert von Luftdurchlaessigkeits-Messungen. Bei der Beurteilung von Niedrigenergiebauten kommt hinzu, dass die z. T. extrem niedrigen Grenzwerte nur aus energetischen Gruenden gefordert werden, obwohl bekanntermassen zwischen der Luftwechselzahl n{sub 50} und den energetisch relevanten Lueftungswaermeverlusten (durch Infiltration/Exfiltration) nur ein indirekter Zusammenhang besteht. Loesungsvorschlaege fuer eine einheitliche Gebaeudepraeparierung und Datenauswertung werden z. Zt. diskutiert. Ziel ist es, fuer die wesentlichen Probleme der komplexen Messmethode einfache, pragmatische Loesungen zu finden und die Moeglichkeiten und Grenzen der Messmethode besser bekannt zu machen. (orig.)

  10. PS转炉鼓风机的选型及KKK风机特点%Selection of PS Converter Blower and Features of KKK Blower

    Institute of Scientific and Technical Information of China (English)

    沈强

    2000-01-01

    阐述了金隆铜业有限公司转炉鼓风机更新的原因;针对转炉鼓风机工作状况的特殊性,提出了选型时的注意事项,分析了不同调节方式下的能耗;并重点介绍了德国KKK公司转炉鼓风机的控制特点及应用情况.

  11. An Analysis of Whistle-Blowers and Their Impact on Marketing Practices.

    Science.gov (United States)

    Montgomery, D. Cameron; Starkey, Paul L.

    1999-01-01

    Describes types of ethical situations in the workplace and types of whistleblowing in which employees might engage. Urges business educators to prepare their students for encounters with illegal or unethical employer practices. (SK)

  12. Law & psychiatry: whistle-blowers and the first amendment: protecting public employees in psychiatric facilities.

    Science.gov (United States)

    Appelbaum, Paul S

    2007-07-01

    This column describes a case in which a psychiatrist employed at a state psychiatric hospital wrote a series of memos to the hospital board, state officials, and a newspaper describing poor-quality care at the hospital. When his contract was not renewed soon thereafter, he filed suit against the state and two state officials alleging violation of his First Amendment rights of free speech. At a trial in 2004 a jury found that the director of the state's Division of Alcoholism, Drug Abuse, and Mental Health had retaliated against the psychiatrist by declining to renew his contract, thus violating his First Amendment rights. Implications of the case for staff in public mental health systems are discussed.

  13. Constitutional Protection for Whistle Blowers: Has the First Amendment Called in Sick?

    Science.gov (United States)

    Sanders, Wayne

    Free speech for the public employee is much more limited than free speech in the society at large. The courts have been unwilling to extend free speech protection carte blanche and have instead cautiously attempted to define what speech would be allowed or prohibited in public organizations. This approach is illustrated in four areas of court…

  14. 罗茨鼓风机的经济运行%Economic Running of Roots Blower

    Institute of Scientific and Technical Information of China (English)

    李剑锋

    2006-01-01

    山东省煤炭科学研究所对兖州矿业(集团)公司焦化厂冷鼓系统煤气输送环节上的ML83WD型132kW罗茨鼓风机实行变频调速及自动控制改造后,有效地改善了其原有落后的运行方式,使风机的转速可以随着煤气量的变化而变化,节约了大量能源,保证了煤气收集系统的安全和稳定运行,提高了供气质量。

  15. Mixed air ceilings for surgical rooms with recirculating blowers; Mischluftdecke fuer OP-Raeume mit Umluftventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-07-01

    Ceilings of modern surgery rooms must have a size of about 3,200 x 3,200 mm for a laminar displacement flow of 0.18 - 0.25 m/s. air volume flows of more than 9,000 cubic metres per hour are required. Not all surgical wards have the capacity for sufficiently large air ducts for central air supply. [German] Die moderne Chirurgie verlangt OP-Zuluftdecken mit Groessen von etwa 3 200 x 3 200 mm, die eine laminare Verdraengungsstroemung im Geschwindigkeitsbereich von etwa 0,18 bis 0,25 m/s sichern. Hierbei werden Zuluft-Volumenstroeme bis ueber 9 000 m{sup 3}/h erforderlich. Nicht alle OP-Abteilungen lassen die Verlegung der entsprechend grossen Luftleitungen fuer zentrale Luftversorgung zu. (orig.)

  16. 罗茨鼓风机的修复%Reparation of Roots blower

    Institute of Scientific and Technical Information of China (English)

    黄跃民

    2007-01-01

    如皋磷肥厂所用的二氧化硫风机为D60×78—2000/5000型罗茨鼓风机,长沙风机厂生产,风量200m3/min,风压20/50kPa,转速980r/min,配套电机为JR126—6型,功率155kW。该风机于1995年投入使用,2000年因风量、风压下降,对叶轮顶端小凸台进行补焊,风量、风压有所上升。后因叶轮与叶轮之间、叶轮与墙板之间间隙太大,仅补焊凸台已不能满足生产需要。由于风机虽多处间隙大,但其它部件均未损坏,将其报废实在可惜,于是对风机采取了大面积的补焊修复措施,补焊后的风机投入使用一年多,运行情况良好。

  17. Development of a Sonic Soot Blower%声波吹灰器的研制

    Institute of Scientific and Technical Information of China (English)

    李强; 孙曾润; 宣益民

    1999-01-01

    根据流体动力学和声学共振理论,研制了一种用于换热设备清除灰尘的声波吹灰器,并对其声强性能进行了相应的实验测试,从测试及工业应用结果来看,该声波吹灰器可以达到清除灰尘的目的.

  18. Effective use of energy saving blowers; Effectieve toepassing van energiebesparende ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Jackmann, H. [Guentner AG and Company KG, Fuerstenfeldbruck (Germany)

    2008-05-15

    In order to make a statement about the effective use of energy-saving fans, it must first be explained what energy-saving fans are. Are they just the most recent fan developments with EC motors or 'Owlet' blades? These technical developments improve the efficiency of the motor and the blades. The amount of efficiency improvement depends on the state of technology with which they are compared. It is not just a case of having an EC motor or a high-tech blade. The choice for the best fan and operating method also has a considerable impact on the energy cost. The fan type and the operating method thereof must be optimized before additional energy costs can be saved using high-tech motor and blade solutions. The first part of the presentation deals with the fan technology so that one can evaluate whether the fan saves energy. The second part shows examples of the optimum choice of fan and energy-optimised operation. [Dutch] Om over een effectief gebruik van energiebesparende ventilatoren te kunnen oordelen moet eerst uiteengezet worden wat onder energiebesparende ventilatoren verstaan wordt. Zijn dat de nieuwe ontwikkelingen van de ventilator-fabrikanten met EC-motoren of met 'Owlet'-ventilatorschoepen (de zgn. 'uilenvleugels' met gekartelde achterrand). Deze technische ontwikkelingen hebben geleid tot een rendementsverbetering van de motor en de schoepen. Hoe groot deze rendementsverbetering is, hangt af van de stand der techniek waarmee wordt vergeleken. Niet alleen de aanwezigheid van een EC-motor of een high-tech ventilatorschoep maar ook de keuze van de juiste ventilator en de werkingswijze heeft een belangrijke invloed op de energiekosten. Daarom moet eerst de keuze en de werkingswijze van de ventilator geoptimaliseerd worden om daarna door middel van oplossingen als EC-motoren of high-tech ventilatorschoepen verdere energiebesparingen te verkrijgen.

  19. Mass flow on the interrupter of regenerative blowers; Massestrom am Unterbrecher von Seitenkanalverdichtern

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachbereich Maschinenbau, Fachhochschule Merseburg (Germany)

    1995-03-01

    The interruptor makes the working principle of side channel machines with their high pressure possible. The work transmission and the characteristic of side channel pumps are also determined by the thermodynamic and flow processes at the interrupter. To set up a calculation model of side channel compressors and their design, it is essential to know the flow processes at the interrupter, particularly from the rotor via the interrupter when giving up work to the mass flow transported to the rotor. Therefore, the mass flow flowing over is examined as a precondition for the design, based on the energy and mass flow balance at the interrupter and experimental investigations. The mass flow ratios m{sub U}/dot m{sub S} are given depending on the delivery and pressure figures. The circulationdelivery for the internal mass flow m{sub U} is defined and proved. The product of {phi}.m{sub U}/m{sub S} of a side channel machine is a constant over the whole working range. (orig.) [Deutsch] Der Unterbrecher ermoeglicht das Arbeitsprinzip von Seitenkanalmaschinen mit ihrer grossen Druckzahl. Die Arbeitsuebertragung und die Kennliniencharakteristik von Seitenkanalpumpen werden aber auch ganz wesentlich von den thermodynamischen und Stroemungsvorgaengen am Unterbrecher bestimmt. Fuer die Aufstellung eines Berechnungsmodells von Seitenkanalverdichtern und deren Auslegung ist die Kenntnis der Stroemungsvorgaenge am Unterbrecher, insbesonder des vom Laufrad ueber den Unterbrecher bei Arbeitsabgabe an das Laufrad transportierten Massestromes, unerlaesslich. Deshalb wird auf der Grundlage der Energie- und Massestrombilanz am Unterbrecher und experimenteller Untersuchungen der ueberstroemende Massestrom als Voraussetzung fuer die Auslegung untersucht. Die Massestromverhaeltnisse m{sub U}/m{sub S}, werden in Abhaengigkeit der Lieferzahl und Druckzahl angegeben. Fuer den inneren Massestrom m{sub U} wird die Zirkulationslieferzahl definiert und nachgewiesen. Das Produkt aus {phi}.m{sub U}/m{sub S} einer Seitenkanalmaschine ist im gesamten Arbeitsbereich eine konstante Groesse. (orig.)

  20. Starting Drocedure of Power Station Blower%电站风机的启动过程

    Institute of Scientific and Technical Information of China (English)

    陆志厚

    2002-01-01

    针对功率储备系数法选配电站风机电动机的存在问题,对电站风机的起动状态和过程以及正常起动的必具条件进行了必要的探讨,结合工作经验,对风机起动时间的多种计算方法进行了述评。推荐了精确度很高的计算公式,并对风机不能正常起动的可能原因进行实用分类。

  1. Field Test of a Blower Base%风机基础的现场检测

    Institute of Scientific and Technical Information of China (English)

    赵茁跃; 赵东岚; 王建群; 魏文晖

    2011-01-01

    对正常工作状态的某风机基础进行了动力测试,采集了控制点的加速度、位移时程,并对其进行了频谱等相关动力分析,全面地了解了风机基础结构自振频率和阻尼比等动力特性的变化规律,对正常使用过程中各点的温度进行了检测,为风机基础的设计提供了依据.

  2. Application of ESW Shock Wave Ash Blower%ESW激波吹灰器的应用

    Institute of Scientific and Technical Information of China (English)

    梁顶华

    2004-01-01

    针对余热锅炉积灰严重导致其效率不断下降的问题,增设了ESW激波吹灰器,介绍了ESW激波吹灰器的工作原理和系统组成及使用条件,应用后,余热锅炉蒸汽产量增加2.5t/h,年增经济效益100万元.

  3. Sicle software. Pumps and blowers modelling; Code sicle. Modelisation des pompes et soufflantes

    Energy Technology Data Exchange (ETDEWEB)

    Faulot, J.P.; Pastorini, S.

    1993-10-01

    The SICLE software includes a simplified modelization for pumps located on fluid circuits. This modelization is based on operating specifications (four quadrants), on energy conservation equation and on the second law of dynamics. The pump is considered like a punctual component without storage of mass or energy. In that case, it is the simplest punctual component of the different elementary modules of SICLE. Nevertheless, for a user, it represents one of the most complex component to model because of the many geometrical (driving or not by motor, turbine with or without coupling, etc...) and functional possibilities (operating in the four quadrants, motor specifications, turbines specifications, internal loss values, etc...). (authors). 4 figs., 1 ref.

  4. 使用变频器控制风机%Control of blowers by transducer

    Institute of Scientific and Technical Information of China (English)

    徐锦坤

    2007-01-01

    变频器在电动机调速中进行输送、引风系统主要用于化工、造纸、印刷、纺织印染等行业的电力系统中.如何采用变频器控制燃煤炉鼓风机利用新技术改造旧设备,并对进行改造前后的经济效益分析.

  5. Effects of water blowers on service life of combustion chamber heating surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Habryka, A. (Zaklad Techniki Cieplnej i Gospodarki Energetycznej (Poland))

    1990-07-01

    Discusses control of fouling in steam generators of coal-fired power plants and the performance of water jet equipment. Heating surfaces of combustion chambers were monitored by optical probes, industrial television cameras, photo- and film cameras. Continuous observation was accompanied by temperature measurements with thermocouples. Negative effects of water jet application and experience gained in Poland, Estonia and in the FRG concerning periods of cleaning cycles are considered. Improved heating surface cleaning procedures and application of water-jet cleaners of the type used in the Thierbach and Jaenschwalde power plants (FRG) are recommended. 8 refs.

  6. 鼓风机叶轮断裂分析%FRACTURE ANALYSIS OF A BLOWER WHEEL

    Institute of Scientific and Technical Information of China (English)

    徐学东; 张亦良

    2000-01-01

    鼓风机投入运行仅一年多因叶轮突然断裂而发生爆炸.对断裂的叶轮材质进行了化学成分及力学性能测定,并用光学显微镜及扫描电镜对材料的组织及断口进行了检验.检验结果表明,热处理工艺控制不当及叶轮材料中存在的锻造缺陷,是导致裂纹产生、造成脆性断裂的主要原因.

  7. CFD-aided design of blowers; CFD-Aided Design von Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Richter, R.; Schilling, R. [Technische Univ. Muenchen, Garching (Germany). Lehrstuhl fuer Hydraulische Maschinen und Anlagen

    1998-12-31

    Within the scope of the AiF research project 10524 N, the Chair for Hydraulic Machines and Plants (LHM) has conceived a development system for the geometric design and the aerodynamic optimisation of any ventilator blading - abbreviated VES - and implemented in industrial use. The system is designed in such a way that the user can both recalculate existing geometries to modify them and prepare a first draft of the blading. A comprehensive postprocessing enables the visualization and assessment of the calculatory results. Besides a Q3D Euler Code for stages, the VES is also equipped with a 3D Euler Code (E3D). As both Codes are hierarchically arranged on the same level in the VEW, it is up to the user to choose the suitable procedure for this problem at hand und to implement it. The modification of the blade geometry is made in case of radial impellers by modification of the blade angle path, in case of axial impellers by modification of the profile parameters. Via a B-spline approximation of the meridian contour, also the stroke or shroud geometry can be revised. (orig.) [Deutsch] Im Rahmen des AiF-Forschungsvorhabens 10524 N wurde vom Lehrstuhl fuer Hydraulische Maschinen und Anlagen (LHM) ein Entwicklungssystem fuer den geometrischen Entwurf und die aerodynamische Optimierung von beliebigen Ventilatorbeschaufelungen - abgekuerzt VES - konzipiert, erstellt und in der Industrie implementiert. Das System ist so konzipiert, dass der Anwender sowohl bestehende Geometrien nachrechnen und modifizieren als auch einen Erstentwurf von Beschaufelungen erstellen kann. Ein umfangreiches Postprocessing ermoeglicht die Visualisierung und Beureilung der Rechenergebnisse. Neben einem Q3D Euler Code fuer Stufen enthaelt das VES auch einen E3D Euler Code. Da beide Codes im VES hierarchisch auf derselben Ebene angeordnet sind, bleibt es dem Anwender ueberlassen, das fuer die vorliegende Problemstellung geeignete Verfahren auszuwaehlen und einzusetzen. Die Ermittlung der Schaufelgeometrie erfolgt bei radialen Laufraedern durch die Modifikation des Schaufelwinkelverlaufs, bei axialen Laufraedern durch die Modifikation der Profilparameter. Ueber eine B-Spline Approximation der Meridiankontur kann auch die Hub- oder Shroudgeometrie veraendert werden. (orig.)

  8. Blowers for clean rooms; Ventilatoren. Keine Beruehrungsaengste mit Reinraum-Planungskonzepten

    Energy Technology Data Exchange (ETDEWEB)

    Schott, T. [CAT Clean Air Technology GmbH, Stuttgart (Germany); Anschuetz, J.; Buehrle, W. [Gebhardt-Ventilatoren, Waldenburg (Germany)

    2005-10-01

    The contribution explains specifications for and components of clean rooms, describes alternative ventilation concepts and shows exemplary tests to be made prior to commissioning. Constructional measures and staff rules are left out of account. (orig.)

  9. 勒芒赛的传奇——宾利Blower

    Institute of Scientific and Technical Information of China (English)

    雷楠

    2009-01-01

    利汽车的创始人Walter owen bentley,1888年9月16日出生在英国伦敦。他从小就对所有机械着迷,热衷于设计和制造一些小型摩托车,积极参加长距离试车比赛,并曾与哥哥一起在伦敦至爱丁堡的长途比赛中获得金牌。

  10. Reformation of soot blower control system%吹灰器控制系统改造

    Institute of Scientific and Technical Information of China (English)

    吴晓洲

    2009-01-01

    介绍了用Symphony/Melody分散控制系统控制吹灰系统的方法,分析了控制方案、电气回路控制原理及控制逻辑的实现等,对系统调试时发现的一些缺陷进行了探讨,并给出了解决办法.

  11. Whistle-blower Walks: Jury Acquits Nurse Who Reported Physician to TMB.

    Science.gov (United States)

    Conde, Crystal

    2010-05-01

    A West Texas jury acquitted a nurse on trial for misuse of official information. She and another nurse had reported a physician to the Texas Medical Board for improperly prescribing herbal medicines that he sold on the side and for performing unauthorized surgical procedures.

  12. Colored and transparent oxide thin films prepared by magnetron sputtering: the glass blower approach.

    Science.gov (United States)

    Gil-Rostra, Jorge; Chaboy, Jesús; Yubero, Francisco; Vilajoana, Antoni; González-Elipe, Agustín R

    2013-03-01

    This work describes the reactive magnetron sputtering processing at room temperature of several mixed oxide MxSiyOz thin films (M: Fe, Ni, Co, Mo, W, Cu) intended for optical, coloring, and aesthetic applications. Specific colors can be selected by adjusting the plasma gas composition and the Si-M ratio in the magnetron target. The microstructure and chemistry of the films are characterized by a large variety of techniques including X-ray photoemission spectroscopy, X-ray absorption spectroscopy (XAS), and infrared spectroscopy, while their optical properties are characterized by UV-vis transmission and reflection analysis. Particularly, XAS analysis of the M cations in the amorphous thin films has provided valuable information about their chemical state and local structure. It is concluded that the M cations are randomly distributed within the SiO2 matrix and that both the M concentration and its chemical state are the key parameters to control the final color of the films.

  13. Optimum geometry for boiler soot blowers nozzles; Geometria optima de toberas para deshollinadores de caldera

    Energy Technology Data Exchange (ETDEWEB)

    Espinoza Garza, Jesus; Garcia Tinoco, Guillermo J.; Martinez Flores, Jose Oscar [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1989-12-31

    For boiler soot blowing converging-diverging nozzles are employed, whose function is to convert thermal energy of a gas into kinetic energy to remove the deposits that adhere to the heat exchanger surfaces. In this paper are described the experimental equipment and the methods for flow, dynamic pressure, discharge velocity and air expansion factor calculation in each nozzle, as a function of its design geometry, utilizing air from a five stage centrifugal compressor. The graphic analysis of the results, concludes that the most efficient nozzles are not the ones than develop the greatest velocity, but the ones of highest dynamic pressure at the outlet. The nozzle geometry that allows obtaining the maximum dynamic air pressure at the discharge is A{sub 2}/A{sub g}=1.3676 [Espanol] Para el deshollinado de calderas se utilizan las toberas convergentes-divergentes, cuya funcion es convertir la energia termica de un gas en energia cinetica para remover los depositos que se adhieren a las superficies de intercambio de calor. En este trabajo se describen el equipo experimental y los metodos de calculo para flujo, presion dinamica, velocidad a la descarga y factor de expansion del aire en cada tobera, como funcion de su geometria de diseno. Durante la experimentacion se evaluaron siete disenos diferentes de toberas, empleando aire de un compresor centrifugo de cinco etapas. Del analisis grafico de los resultados, se concluye que las toberas mas eficientes no son las que desarrollan mayor velocidad sino las de mayor presion dinamica de la salida. La geometria de tobera que permite obtener la maxima presion dinamica del aire a la descarga es A{sub 2}/A{sub g} = 1.3676.

  14. Lab Test of MIPS Turbodyne II Precleaner with Scavenge Blower Motor.

    Science.gov (United States)

    1998-07-01

    A verbal agreement given by Satya Kodali , Team leader of the Crusader Team, to conduct the testing since a similar type Turbodyne II air cleaner...possible to make a direct comparison between TARDEC’S test data and SBM manufacturers test data due to differences in test conditions/ methods . A comparison...obtained by SwRI during their particle size determination tests. Two main differences in testing methods between the two test sites included the

  15. Glass Blower, Laboratory Apparatus (inst. & app.) 4-65.440--Technical Report on Standardization of the General Aptitude Test Battery.

    Science.gov (United States)

    Manpower Administration (DOL), Washington, DC. U.S. Training and Employment Service.

    The United States Training and Employment Service General Aptitude Test Battery (GATB), first published in 1947, has been included in a continuing program of research to validate the tests against success in many different occupations. The GATB consists of 12 tests which measure nine aptitudes: General Learning Ability; Verbal Aptitude; Numerical…

  16. Mechanism and Diagnostic Method for Vibration of Blower%风机故障机理及诊断方法

    Institute of Scientific and Technical Information of China (English)

    张远军

    2009-01-01

    文章主要分析了风机振动机理及风机常见故障的诊断.运用时域分析、频谱分析和轴心轨迹分析等方法对风机振动进行分析,得出风机振动的原因是转子不平衡,风机转子不平衡故障分为转子质量偏心和转子部件缺损2种情况,其故障机理是相同的.对转子不平衡进行了受力分析,计算了转子不平衡量产生的力、力矩、力偶等,得出了转子平衡的条件.

  17. 声波吹灰器的原理和应用%Principal and Application of Acoustic Soot Blower

    Institute of Scientific and Technical Information of China (English)

    赵旺初

    2002-01-01

    声波吹灰器在欧美和日本得到了广泛的应用,在我国尚属待推广和深化的新技术.文章介绍了声波吹灰器优于传统吹灰器的机理、结构、经济分析和节能效果,并举例说明.

  18. Reformation of the Impeller of Feeding Air Blower%送料风机叶轮的改造

    Institute of Scientific and Technical Information of China (English)

    张睿

    2006-01-01

    我公司由于生产需要新建了一套芦苇加工处理系统,使用切苇机将芦苇切成长度均匀的苇片,经过双锥除尘器后由除尘风机送至旋风分离器除尘,由旋风分离器出来的苇片储存至一定的数量再由送料风机送至下道工序使用。

  19. Design and Optimization of GGH Soot-blower%GGH吹灰器的设计与优化

    Institute of Scientific and Technical Information of China (English)

    符琦弘

    2015-01-01

    我国对环保问题日趋重视,火电厂纷纷上马脱硫项目.在国内电厂的烟气脱硫系统中,普遍安装了GGH吹灰器.目前市场上的GGH吹灰器常常存在烟气泄漏、提升阀和吹灰外管的使用寿命低、吹灰效果不理想等问题.通过分析,针对正压风系统、吹灰器喷嘴头、开关阀装置等方面的问题,提出了优化设计的思路和方向.

  20. The Improvement of Shaft-seal in Roots Blower%罗茨鼓风机轴封的改进

    Institute of Scientific and Technical Information of China (English)

    黄君领

    2009-01-01

    给出了罗茨鼓风机的技术参数,提出风机运行后轴封存在的问题,并对各种现象进行了分析,采取了改进措施,改进后的风机各项技术指标均符合标准要求,运行稳定.

  1. 机前富氧鼓风的探讨%On Oxygen Enrichment Blast in Front of Blower

    Institute of Scientific and Technical Information of China (English)

    周洪月

    2012-01-01

      To improve coal ratio is the key task of iron making. The impact of oxygen enrichment on coal ratio has been validated in theory and practice. 3%~5%oxygen enrichment ratio is essential for the realization of the coal ratio higher than 200 kg/t. The paper discusses the advantages of oxygen enrichment, the calculation of oxygen-enriched ratio and safety mea-sures that will be taken in operation.%  提高煤比是我国炼铁的重要任务,富氧对提高煤比的作用在理论和实践中都得到证实,3%~5%的富氧率是实现200 kg/t以上煤比的必要条件。文章主要对机前富氧的优点、富氧率的计算及运行过程中采取的安全措施进行探讨。

  2. Simulation of Air Flow in a Blower%风机流场的数值模拟

    Institute of Scientific and Technical Information of China (English)

    李建锋; 吕俊复

    2006-01-01

    应用计算流体力学软件Fluent对9-26型高压离心风机内部的三维气体流动进行了数值模拟与分析.计算中采用了标准k-ε湍流模型与非结构化网恪.同时对计算结果进行了分析.模拟结果有助于理解风机内部的流动规律.

  3. 拖动风机的SRM调速系统%SRM Speed Governing System of Drive Blower

    Institute of Scientific and Technical Information of China (English)

    赵树芬

    2008-01-01

    阐述了开关磁阻电动机(SRM)的基本结构和原理,并推导了转矩表达式,论述了自行研制的拖动风机开关磁阻电动机调速系统(SRD)采用脉宽调制(PWM)控制技术来实现调压调速的机理,介绍了采用SRM拖动局扇,使工作面条件得到改善,满足了安全生产对风量的要求,并可节约电能.

  4. 煤矿矸石山喷爆的预防%Prevention of Explosion and Blower of Waste Heaps

    Institute of Scientific and Technical Information of China (English)

    张振文

    2001-01-01

    喷爆是煤矿矸石山强烈自燃的特殊表现形式,是一种采矿灾害.直接危害人身安全,影响煤矿的安全生产.本文从喷爆形成机理入手,介绍与讨论了多种预防措施,以期减少灾害的发生,降低其损害性.

  5. SO2鼓风机的装配和维护%Assembly and maintenance of SO2 blower

    Institute of Scientific and Technical Information of China (English)

    苏伟峰

    2005-01-01

    河南中原黄金冶炼厂采用金精矿粉沸腾焙烧脱硫、焙砂冶炼、烟气制酸的生产工艺。制酸装置选用陕西鼓风机厂生产的C600-1.264/0.914型离心鼓风机,输送风量为690m3/min,额定压力为44kPa;其配套电机型号为JK2630-2,额定功率为630kw,额定转速为2975r/min。鼓风机本体为单吸人、两级支承式,与电机利用弹性联轴器联接。在运行初期,鼓风机每两个月就要维修一次,严重制约了硫酸装置的开车率和产量。

  6. 氯气风机优化设计方案%Optimization Design of Chlorine Gas Blower

    Institute of Scientific and Technical Information of China (English)

    郑纪东; 刘宁; 郑东周

    2013-01-01

    文章叙述了15万t/a离子膜烧碱装置氯气处理生产工艺原理及工艺流程;该装置现运行生产状况,针对出现的问题,查找原因,找到解决办法;通过对工艺、设备的技术改造,达到节能降耗,稳定生产.

  7. 智能冷暖风机控制器%The Intelliget Controller for the Cold and Warm Blower

    Institute of Scientific and Technical Information of China (English)

    张蕾

    2011-01-01

    本文从智能化、低成本、功能全、使用方便的角度设计了冷暖风机控制器.本文从控制器系统的硬件电路和软件开发两个方面进行设计:在硬件设计上采用Atmel公司生产的性价比高的AT89C2051单片机;在软件设计上利用汇编语言设计了个模块程序及主程序.并对程序进行了调试.结果证明该控制器可以达到我们所预期的功能.

  8. Reconstruction of Blower Control System in Waterworks%水厂的风机控制系统改造

    Institute of Scientific and Technical Information of China (English)

    李展峰; 邹振裕

    2008-01-01

    对沙口水厂风机控制系统在运行过程中经常出现的风机启动失败、电机启动电流过大、电机发热严重等问题进行了分析.针对上述问题,提出了相应的改造措施,改造完成后解决了风机控制系统存在的问题,保证了水厂的安全生产.

  9. Blower 4.5litre勒芒冠军赛车--赛场中的精灵--MINI COOPER

    Institute of Scientific and Technical Information of China (English)

    雷楠

    2009-01-01

    MINI.它小巧的外形,鲜艳的颜色一定让您印象深刻.可爱时尚的外形更是深得女孩子们的喜爱,它在宝马这个充满霸气和男性气息的品牌呈犹如精灵般存在.但很多人一定不知道这款英国设计的小车曾在赛场上出尽风头。

  10. 轴流风机噪声源和消声器%Noise sources and silencer of axial blower

    Institute of Scientific and Technical Information of China (English)

    刘桂贤

    2002-01-01

    FXZ-1消声器,应用于JBT62-2(28kW)矿用轴流式风机上,成功地将风机噪声从115 dB(A)降至90 dB(A)以下,并在消声器的防潮、防尘方面取得了良好的效果,使消声器寿命有效地延长.

  11. 风机防喘振的应用研究%Applied research on vibration-proof of blower

    Institute of Scientific and Technical Information of China (English)

    白洪强; 张军; 白洪光; 肖利平

    2004-01-01

    介绍了风机的喘振机理,分析了实际工业生产中风机的喘振的特性,提出以采用UDC6000可编程调节器防喘振控制方法,并在实际生产中实施应用,对于提高玻璃厂风机设备的使用效率及延长其寿命有实际意义.

  12. Discussion on the Energy Conservation of Pump and Air-blower%泵与风机的节能探讨

    Institute of Scientific and Technical Information of China (English)

    梁贺志

    2006-01-01

    通过改变泵与风机参数,使得泵与风机的性能曲线交至工作点附近,使系统能在最佳工况中运行,降低功率消耗.介绍了泵的选型以及改变泵运行范围的最佳经济方法以及多种泵与风机调节运行工况的特点.

  13. Measurement of the turbulence intensity behind a two-dimensional cascade and in a three-stage axial blower

    Science.gov (United States)

    Kiock, R.

    1978-01-01

    Turbulence intensity (Tu) measurements were made in two-dimensional and rotating cascades of blades in a low-speed cascade wind tunnel using hot-wire probes as sensors. The local Tu at Re = 1.6x100000 was determined in the wake zone behind a two-dimensional cascade. Then the values were recomputed for a rotating cascade, giving a mean turbulence intensity of 6.5% at 1/10 chord downstream and 2.9% at one chord. Fans were used for measurements on the rotating cascade. Re was equal to 7x100000. Frequency analysis was employed to separate the actual Tu of the entry flow from the effects caused by interaction with the rotor blades, showing that the true Tu increased from a few tenths of a percent to 6.6% in the 1st rotor, and from 7.2 to 9.3% in the 2d rotor. The Tu behind the 3d rotor was equal to 8.9%.

  14. Supervisory System for Blower System of the Calciner%焙烧炉风机的监控系统

    Institute of Scientific and Technical Information of China (English)

    郝瑞云

    2003-01-01

    风机是氧化铝生产的关键设备之一,对其运行状态进行监测控制,实行安全联锁,可以提高风机运转率、减少故障发生.介绍了焙烧炉风机的监控系统,由于该系统是由先进的电气设备、仪表及控制系统所组成,因此,该系统功能齐全、控制可靠、监测精度高,为焙烧炉风机系统的稳定运行创造了条件.

  15. 大型罗茨鼓风机的修复%The Repair of Large Type Roots Blower

    Institute of Scientific and Technical Information of China (English)

    黄君领

    2009-01-01

    针对罗茨鼓风机故障情况,根据各部件工作原理及使用要求,制定相应的修复工艺,并成功实施,对修复前后的数据作了对比.总结出了部分罗茨鼓风机的修理经验.

  16. The building structure design of blower house%鼓风机房的建筑结构设计

    Institute of Scientific and Technical Information of China (English)

    高劼

    2003-01-01

    就鼓风机的选型及鼓风机房一些特殊的建筑要求以及由此引起的结构设计等方面进行了阐述,重点介绍了设计当中的重点和难点.指出鼓风机的选择及鼓风机房的设计对污水处理的重要性.

  17. Analysis on transformation of K-3250 blower%浅析K-3250型鼓风机改造

    Institute of Scientific and Technical Information of China (English)

    陈瑜; 马俊; 赵政华

    2009-01-01

    针对西南某钢厂在役K-3250型风机存在运行能力不足,效率不高,机头轴瓦振动值偏高等系列问题进行分析,并提出整改方案、措施.经改造完成后,有效消除机组运行过程中存在的问题,并取得良好的经济效益.

  18. A New Cast Snow Blower on Base of Forklift%新型叉车式抛扬除雪车

    Institute of Scientific and Technical Information of China (English)

    夏建满; 伍汉清; 张忠刚

    2009-01-01

    在综合国内外除雪装备技术的基础上,开发出一种新型叉车式除雪车.此新型除雪车以叉车为改装平台,采用抛扬方式的除雪系统,其结构简单、功能完备、经济实用,具有广阔的应用前景.

  19. Points for Attention in Selection of Blower%风机选型的注意事项

    Institute of Scientific and Technical Information of China (English)

    张春苗

    2008-01-01

    从风量与风压选择、风机实际运行工况与样本所给性能对应状况的差异、正确认识风机的并联和串联、气体含尘量对风机特性曲线的影响4个方面总结了风机选型时应注意的问题.

  20. 氯气风机的优化设计%The optimum design of chlorine gas blower

    Institute of Scientific and Technical Information of China (English)

    黄丽颖; 左远辉

    2005-01-01

    介绍了氯碱生产中采用的高压氯气风机的设计及制造方案,该氯气风机的密封性、耐腐蚀性均达到了设计要求,与日本产氯气风机相比,在相同转速下,该风机效率较高.

  1. An experimental study on the rotating stall in vaneless diffuser of centrifugal blower with radial type impeller

    Energy Technology Data Exchange (ETDEWEB)

    Kim, J.H. [Yonsei University Graduate School, Seoul (Korea, Republic of); Cho, K.R. [Yonsei University, Seoul (Korea, Republic of)

    1998-09-01

    The vaneless diffusers are widely used in industrial centrifugal compressors which are required to operate within a wide flow range. When very high pressure gases are handled by centrifugal compressor, rotating stall is a serious problem because of the occurrence of large aerodynamic exciting forces. Rotating stall mostly often occurs in the impellers but it can occur in vaneless diffusers as well. In this experimental study, the rotating stall in vaneless diffuser with radial type centrifugal impeller was measured by changing the flow rate with I-type, X-type hot-wire. As the result, it was cleared which type of rotating stall of the impeller stall would occur and how many stall cells would appear relating with the flow rate. As the flow rate reduced, the propagation speed of rotating stall was reduced. But the stall cell number unchanged with respect to the flow rate. (author). 7 refs., 13 figs.

  2. Controlling Aedes aegypti in Cryptic Environments with Manually Carried Ultra-Low Volume and Mist Blower Pesticide Applications.

    Science.gov (United States)

    Harwood, James F; Helmey, Wendy L; Turnwall, Brent B; Justice, Kevin D; Farooq, Muhammed; Richardson, Alec G

    2016-09-01

    Because Aedes aegypti , a vector of dengue, chikungunya, and Zika viruses, exhibits resting and reproductive behaviors that present challenges to control them, pesticide application equipment available for vector control must be evaluated for their ability to control this species in a variety of cryptic environments. Five types of pesticide sprayers, representing 3 spray technologies (1 mister, 2 ultra-low volume [ULV] cold foggers, and 2 ULV thermal foggers), were evaluated for their ability to control adult and immature stages of Ae. aegypti in indoor and outdoor environments. Cages holding adult mosquitoes and larvae were placed in cryptic sites for indoor sprays and placed among dense vegetation for outdoor sprays. Adult and pupal mortality data were recorded following applications of a mixture of synergized pyrethrins and pyriproxyfen. We found that no single sprayer was best suited for controlling Ae. aegypti in indoor and outdoor environments, nor was one best for controlling adult and immature mosquitoes. Sprayers producing larger droplets (misters and cold foggers) were more effective in controlling immature mosquitoes indoors and outdoors. Thermal fogging was more effective in controlling adults indoors, whereas cold fogs and misters were more effective for outdoor control.

  3. Theoretical analysis on the casualty of explosion and blower of waste heap with the mutation of intrinsic factors

    Energy Technology Data Exchange (ETDEWEB)

    Qin, B.; Wang, D.; Li, Z. [China University of Mining and Technology, Xuzhou (China). State Key Laboratory of Coal Resources and Safe Mining

    2008-11-15

    In order to solve the difficulty caused by lack of water and mud for mine fire control in the northwest area of China and overcome the shortcomings of pouring sand, a thickener with three-dimensional network structure was developed. The mechanism of the thickener suspending sand was analyzed in theory and experiments were made on the suspending sand effect and flow characteristics. The results show that the pH value and yield stress of the thickener influence its suspending ability. The suspending sand process is a stepwise gelation; it can reduce the pipeline surface wear and flow resistance and is suitable for long-distance transportation in pipelines. The thickener was successfully applied at 31305 and 31306 working faces on Bulianta Mine in Shendong.

  4. Theoretical analysis on the casualty of explosion and blower of waste heap with the mutation of intrinsic factors

    Energy Technology Data Exchange (ETDEWEB)

    Jia, H.; Yu, M.; Pan, R.; Yu, S. [Henan Polytechnic University, Jiaozuo (China). College of Safety Science and Engineering

    2008-11-15

    In order to analyse the effects of explosion and disturbance in the waste heap of No. 4 coal mine of Pingdingshan Coal Co. Ltd., the equation of state and specific internal energy equation from the theory of explosion dynamics were applied to find a kinetic model. The evolution process of the explosion and disturbance of the waste heap has the same effect as dynamite being hurled into the explosion centre and the equivalent weight of the dynamite changes with the extent of reaction of the coal, air and water. 9 refs., 2 figs., 3 tabs.

  5. Design and Experimental and Numerical Verifications of the Recirculating Blower for Long-Term Tests of Turbine Flowmeters

    Directory of Open Access Journals (Sweden)

    Kryłłowicz Władysław

    2014-03-01

    Full Text Available W artykule przedstawiono konstrukcje odsrodkowej dmuchawy recyrkulacyjnej oraz wyniki jej badan eksperymentalnych jak i numerycznych. Zaprezentowana dmuchawa została zaprojektowana do pracy na unikalnym stanowisku badawczym, które słuzy do długoterminowych testów przepływomierzy turbinowych. W artykule zaprezentowano porównanie przyrostu cisnienia uzyskane z pomiarów i z symulacji numerycznych. Pokazano równiez rozkłady cisnien i predkosci dla wybranych powierzchni kontrolnych.

  6. Internet-controlled blower test bench with adjustable inlet guide vanes; Ueber das Internet steuerbarer Geblaesepruefstand mit einstellbaren Eintrittsleitschaufeln

    Energy Technology Data Exchange (ETDEWEB)

    Bosis, R.; Napoli, M. de [Politecnico di Milano (Italy); Franke, T. [Fachhochschule Aachen (Germany)

    2001-07-01

    At the FH-Aachen an axial ventilator test bed was installed. The angles of the inlet guide vanes and the throttle behind the ventilator can be adjusted by stepping motors. The volume flow V is detected with a Prandtl-tube, the specific work Y with pressure and temperature measurements. With both values a ventilator map can be drawn. As the test bed should show the multiple possibilities of LabVIEW for test bed techniques the total pressure behind the ventilator was calculated with Imaq image processing using the filling mark of a fluid manometer, that was detected by a video camera. The test bed can be controlled via Internet. (orig.) [German] Wird ein Geblaese durch einen Asynchronmotor mit konstanter Drehzahl angetrieben, so ist der Volumenstrom V und die Druckerhoehung ueber das Geblaese {delta}p{sub t} nur von der Drosselung hinter dem Geblaese abhaengig. Es ergibt sich somit eine einzelne Kennlinie, auf der der Drosselgrad {beta}, der Volumenstrom und die Druckerhoehung unmittelbar voneinander abhaengen. Sollen der Volumenstrom und die Druckerhoehung unabhaengig voneinander geregelt werden, so wird ein zusaetzlicher Regelparameter benoetigt. Dieser Parameter kann die Drehzahl, eine variable Abblasevorrichtung oder eine variable Schaufelstellung des Laufrades oder des Leitrades sein. (orig.)

  7. 78 FR 72579 - Revisions to the Arizona State Implementation Plan, Maricopa County Area

    Science.gov (United States)

    2013-12-03

    ...-877 Air Quality Control Measures... 07/02/07 05/25/12 ADEQ 49-457.01 Leaf Blower Use Restrictions 07/02/07 05/25/12 and Training; Leaf Blowers Equipment Sellers; Informational Material; Outreach... emissions from leaf blowers, expanding leaf blowers requirements beyond county employees, control of...

  8. Coke Oven Gas Blower Impeller Fracture Analysis%焦炉煤气鼓风机叶轮断裂的原因分析

    Institute of Scientific and Technical Information of China (English)

    游小城

    2010-01-01

    针对焦炉葆气鼓风机在使用过程中出现叶轮断裂的问题,通过采用改进制造工艺、对断裂的叶片和铆钉进行物理化学分析、对破坏断口进行宏观及微观研究等措施,得到焦炉煤气鼓风机叶轮断裂原因.研究表明:制作工艺和应力腐蚀是焦炉煤气鼓风机断裂的主要原因.

  9. The brave new world of Medicare and Medicaid fraud and abuse enforcement: whistle-blowers, pre-filing agreements, and voluntary disclosure.

    Science.gov (United States)

    Manning, M M

    1995-03-01

    Providers participating in the recent wave of mergers, acquisitions, and affiliations may have unwittingly expanded their false claims exposure because many false claim-type situations are difficult, if not impossible, to identify in pre-closing due diligence. In addition, the possibility of retrospective characterization of ordinary billing mistakes as "false claims" increasingly introduces significant uncertainty to the average provider's financial future. To date, the single most effective approach to this problem is an independent compliance review to identify and resolve any existing exposure, including voluntary disclosure if appropriate, and an ongoing compliance program to communicate to all employees not only the content of applicable rules but also the genuine commitment of management to ensure continuing compliance above other concerns.

  10. Systems for controlled ventilation of new or modernized buildings. Energy-saving blowers; Kontrollierte Wohnungslueftung fuer Neubau und Sanierung. Energie sparende Ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Salig, Andreas [ebm-papst, Mulfingen (Germany). Verkauf Inland; Reiff, Ellen-Christine [Redaktionsbuero Stutensee (Germany)

    2010-07-01

    In its Energy Conservation Ordinance of 2009 (EnEV), the German government reduced the maximum energy consumption of a new building by 30 percent as compared to the EnEV 2007. From 2012, another 30 percent reduction is envisaged. This applies also to modernized buildings. (orig.)

  11. Testing of blowers and HVAC systems. Guide for energy optimization regarding ambient air ventilation systems. Pruefungen von Ventilatoren und Raumlufttechnischen Geraeten. Wegweiser zur Energieoptimierung bei RLT-Geraeten

    Energy Technology Data Exchange (ETDEWEB)

    Breit, O.

    1992-09-01

    Through a continuously increasing environmental consciousness and the increase of energy cost to be expected in the next years, ambient air ventilation systems with an optimized energy consumption are increasingly applied. For the determination of the energy consumption, special test rigs for the capacity are necessary. They consist of two climatic chambers arranged side by side, two measured sections and two speed controlled supporting fans. The tests carried out on the capacity and function of ambient air ventilation systems showed that the power consumption and thus, the energy consumption can be considerably reduced through constructional changes and an exact design of single components based on measured results. (BWI).

  12. Energy conservation by application of a volume-flow-dependent linear speed control for pumps and blowers. Energiebesparing met volumestroomafhankelijke toerenregeling voor pompen en ventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Slagt, G. (Nederlands Omroepproduktie Bedrijf NV, Hilversum (Netherlands))

    1990-06-01

    The Energie-Einspar-Technik uses a sensor to measure flow rates. A coupled microprocessor is used to control the thyristor power control unit or the frequency transformer of an electromotor. Two pumps, driven by 22 kW-electromotors and used for coldwater transport in buildings, are compared in order to test this system. The thyristor power control unit of one of the electromotors was replaced by a frequency transformer controlled by the microprocessor. Energy conservation for the latter electromotor has been 35% during the test period (15 days for each pump; the pumps can replace one another). Measured electric power consumption data are presented. 1 ill., 1 tab.

  13. Performance of High-pressure-ratio Axial-flow Compressor Using Highly Cambered NACA 65-series Blower Blades at High Mach Numbers

    Science.gov (United States)

    Voit, Charles H; Guentert, Donald C; Dugan, James F

    1950-01-01

    A complete stage of an axial-flow compressor was designed and built to investigate the possibility of obtaining a high pressure ratio with an acceptable efficiency through the use of the optimum combination of high blade loading and high relative inlet Mach number. Over-all stage performance was investigated over a range of flows at equivalent tip speeds of 418 to 836 feet per second. At design speed (836 ft/sec), a peak total-pressure ration of 1.445 was obtained with an adiabatic efficiency of 0.89. For design angle of attack at the mean radius, a total-pressure ratio of 1.392 was obtained.

  14. Design of the Diecasting Die for the Blower Fans of the Motors%电机风叶压铸模设计

    Institute of Scientific and Technical Information of China (English)

    韩耀东

    2001-01-01

    After a technological analysis of the thin-wall ribbed diecastingparts, an inner gate of special shape was designed. Through theoretical calculations, the type of the diecasting machine tool was determined. The design of the die adopted reasonable insert structure, which solved the problem of the slide short of strength and the die sets short of rigidity in the core-pulling process. Under the action of the twice-parting mechanism, the die works well.%对薄壁多筋的铸件进行了工艺分析,设计了一种特殊形状的内浇口,并经过理论计算,确定了压铸机床的型号。模具设计采用了合理的镶件结构,解决了滑块在抽芯过程中的强度不足以及模架刚性不足等问题。在二次分型机构的作用下,模具工作自如。

  15. ACS1000在闪速炉风机上的应用%ACS1000 APPLICATION ON THE BLOWER OF FF

    Institute of Scientific and Technical Information of China (English)

    李跃新

    2003-01-01

    分析闪速炉风机调速的特点,并结合贵溪冶炼厂闪速炉排风机变频改造对变频调速系统的构成和ACS1000变频器的结构特点进行了讨论,从技术和实际应用上阐述了变频技术节能的原理和效果.

  16. A large-scale field trial of ultra-low-volume fenitrothion applied by a portable mist blower for the control of Aedes aegypti*

    Science.gov (United States)

    Pant, C. P.; Mathis, H. L.; Nelson, M. J.; Phanthumachinda, Boonluan

    1974-01-01

    Long-term control of Aedes aegypti, the vector of dengue haemorrhagic fever in Thailand, was obtained by 2 thorough applications of fenitrothion mist applied at a target dosage rate of 0.1 ml per m3 of room space. Perfect control lasted for 6-7 months after treatment and densities were substantially reduced for up to a year after treatment. Recovery of the population was still slow up to almost 16 months after treatment. This degree of control was achieved by the immediate mortalities produced by 2 treatments spaced about 2 weeks apart, the larvicidal effect of the fenitrothion aerosol, and a limited residual effect that prevented oviposition for a period, so that the recovery potential was greatly diminished. It appears that aerosol and mist treatments designed as epidemic control measures can be adapted to long-term preventive control of A. aegypti. However, the equipment used and the method of application require further improvement. PMID:4549492

  17. You won`t find these leaks with a blower door: The latest in {open_quotes}leaking electricity{close_quotes} in homes

    Energy Technology Data Exchange (ETDEWEB)

    Rainer, L. [Davis Energy Group, CA (United States); Greenberg, S.; Meier, A. [Lawrence Berkeley National Lab., CA (United States)

    1996-08-01

    Leaking electricity is the energy consumed by appliances when they are switched off or not performing their principal functions. Field measurements in Florida, California, and Japan show that leaking electricity represents 50 to 100 Watts in typical homes, corresponding to about 5 GW of total electricity demand in the United States. There are three strategies to reduce leaking electricity: eliminate leakage entirely, eliminate constant leakage and replace with intermittent charge plus storage, and improve efficiency of conversion. These options are constrained by the low value of energy savings-less than $5 per saved Watt. Some technical and lifestyle solutions are proposed. 13 refs., 1 fig., 2 tabs.

  18. A large-scale field trial of ultra-low-volume fenitrothion applied by a portable mist blower for the control of Aedes aegypti.

    Science.gov (United States)

    Pant, C P; Mathis, H L; Nelson, M J; Phanthumachinda, B

    1974-01-01

    Long-term control of Aedes aegypti, the vector of dengue haemorrhagic fever in Thailand, was obtained by 2 thorough applications of fenitrothion mist applied at a target dosage rate of 0.1 ml per m(3) of room space. Perfect control lasted for 6-7 months after treatment and densities were substantially reduced for up to a year after treatment. Recovery of the population was still slow up to almost 16 months after treatment. This degree of control was achieved by the immediate mortalities produced by 2 treatments spaced about 2 weeks apart, the larvicidal effect of the fenitrothion aerosol, and a limited residual effect that prevented oviposition for a period, so that the recovery potential was greatly diminished. It appears that aerosol and mist treatments designed as epidemic control measures can be adapted to long-term preventive control of A. aegypti. However, the equipment used and the method of application require further improvement.

  19. An Analysis of Internal Flow of Diagonal Flow Blower with Quasi-Three-Dimensional Calculation Method Considering the Spanwise Mixing due to Secondary Flow

    Energy Technology Data Exchange (ETDEWEB)

    Park, S.R. [Inha University, Inchon (Korea); Kim, Y.J.; Kim, T.W. [Doowon Technical College, Ansung (Korea)

    1999-12-01

    This paper presents a quasi-three-dimensional calculation method considered a spanwise mixing effect in a diagonal flow impeller. The effect of this spanwise mixing caused by spanwise distribution of blade loading is evaluated by a secondary flow theory. In order to verify the validity of this method, it is applied to the analysis of a diagonal flow fan designed under a vortex type of constant circumferential velocity and that of a free vortex. The comparison of the calculated result with experimental data shows a good agreement except the regions near the casing where the flow field is affected by the tip leakage flow. (author). 18 refs., 10 figs.

  20. Energy conservation in space HVAC systems. Improving specific blower performance with leaktight air ducts; Energieeinsparung in RLT-Anlagen. Verbesserung der spezifischen Ventilatorleistung mit dichteren Luftleitungen

    Energy Technology Data Exchange (ETDEWEB)

    Luft, J. [Lindab GmbH, Bargteheide (Germany)

    2005-07-01

    The 91 goals stated in the Energy Performance of Buildings Directive (EPBD) 2002/91 are implemented in German law by the Energy Conservation Ordinance and further standards and regulations. In the case of ventilation and air conditioning systems, DIN EN 13779 applies, in which a SFP (specific fan power) value is introduced. The contribution shows how leaktightness of air ducts will affect the SFP. (orig.)

  1. 基于DCS的风机控制系统设计及应用%The Design and Application of DCS-Based Fan Blower Control System

    Institute of Scientific and Technical Information of China (English)

    张兆林; 隋景明

    2001-01-01

    @@  热电厂1#风机是AV50轴流式鼓风机。控制系统按设备组成分为风机控制和透平控制两大部分。整个控制系统采用德国DGIGIMATK的freelance 2000 DCS,实施对风机的启、停控制,安全保护,运行中过程控制,数据采集与监控等。

  2. Reseach on the Protective Device of Air Distributing in Blast Furnace Blower System%高炉拨风保护装置的研究

    Institute of Scientific and Technical Information of China (English)

    方声丑

    2013-01-01

      本文针对杭钢高炉供风的实际情况,研究并开发了防灌渣自动拨风保护装置系统,该系统基本能满足高炉对生产运行安全的需求。%  In this paper ,according to the Hangzhou Iron&Steel Group Compny blast furnace air supply, research and development of a system, the system is carried out to achieve automatical y dial wind and prevent tuyere slag irrigation .The system can meet the basic demand for the safe operation of the production of blast furnace.

  3. 29 CFR 1918.94 - Ventilation and atmospheric conditions (See also § 1918.2, definitions of Hazardous cargo...

    Science.gov (United States)

    2010-07-01

    ... of portable blowers and any exposed belt drives shall be guarded to prevent injury to employees. (3) The frames of portable blowers shall be grounded at the source of the current by means of an...

  4. 76 FR 37678 - Energy Conservation Program for Consumer Products and Certain Commercial and Industrial Equipment...

    Science.gov (United States)

    2011-06-28

    ..., Blowers, and Fume Hoods as Covered Equipment AGENCY: Office of Energy Efficiency and Renewable Energy... Energy (DOE) proposes to determine that commercial and industrial fans, blowers, and fume hoods meet the... . Follow the instructions for submitting comments. E-mail:...

  5. 40 CFR 63.4165 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... operation for which capture efficiency is being determined must be shut down, but all fans and blowers must... being determined must be shut down, but all fans and blowers must be operating normally. (4) For...

  6. 40 CFR 63.4964 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... being determined, must be shut down, but all fans and blowers must be operating normally. (5) For each... fans and blowers must be operating normally. (4) For each capture efficiency test run, determine...

  7. 40 CFR 63.4361 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ..., but all fans and blowers must be operating normally. (5) For each capture efficiency test run... determined, must be shut down, but all fans and blowers must be operating normally. (4) For each...

  8. 29 CFR 452.38 - Meeting attendance requirements.

    Science.gov (United States)

    2010-07-01

    ..., where over 97 percent of the members were ineligible (Wirtz v. Local 153, Glass Bottle Blowers Ass'n... Blowers Ass'n., 290 F. Supp. 965 (N.D. Cal., 1968)); attendance at each of eight meetings in the...

  9. 9 CFR 3.117 - Terminal facilities.

    Science.gov (United States)

    2010-01-01

    ... marine mammals must be ventilated with fresh air or air circulated by means of fans, blowers, or an air... exhaust fans and vents or fans or blowers or air conditioning must be used for any animal holding...

  10. 40 CFR 63.3965 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... which capture efficiency is being determined, must be shut down, but all fans and blowers must be... determined, must be shut down, but all fans and blowers must be operating normally. (4) For each...

  11. 29 CFR 1915.136 - Internal combustion engines, other than ship's equipment.

    Science.gov (United States)

    2010-07-01

    ..., for such purposes as driving pumps, generators, and blowers, the exhaust shall be led to the open air... parts per million (0.005%). The employer shall use blowers sufficient in size and number and so...

  12. 40 CFR 63.4565 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... down, but all fans and blowers must be operating normally. (5) For each capture efficiency test run... which capture efficiency is being determined, must be shut down, but all fans and blowers must...

  13. 46 CFR 151.25-1 - Cargo tank.

    Science.gov (United States)

    2010-10-01

    ... continuously swept with air by means of blowers or other mechanical devices requiring power. (d) Ventilated... without the use of blowers or other mechanical devices requiring power (e.g., “chimney-effect”...

  14. 9 CFR 3.141 - Terminal facilities.

    Science.gov (United States)

    2010-01-01

    ... circulated by means of fans, blowers, or an air conditioning system so as to minimize drafts, odors, and moisture condensation. Auxiliary ventilation, such as exhaust fans and vents or fans or blowers or...

  15. 40 CFR 63.4765 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... determined, must be shut down, but all fans and blowers must be operating normally. (5) For each capture... being determined, must be shut down, but all fans and blowers must be operating normally. (4) For...

  16. 40 CFR 63.3165 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... determined, must be shut down, but all fans and blowers must be operating normally. (5) For each capture... fans and blowers must be operating normally. (4) For each capture efficiency test run, determine...

  17. 40 CFR 63.3544 - How do I determine the emission capture system efficiency?

    Science.gov (United States)

    2010-07-01

    ... capture efficiency is being determined must be shut down but all fans and blowers must be operating... operation for which capture efficiency is being determined, must be shut down but all fans and blowers...

  18. 75 FR 31223 - Energy Conservation Program for Consumer Products: Test Procedure for Residential Central Air...

    Science.gov (United States)

    2010-06-02

    ... installation with a hot-air furnace must contain a blower to circulate air through the indoor coil and ductwork... on the furnace blower to circulate air through the indoor coil, ductwork, and the furnace...

  19. 75 FR 25241 - Notice of a Project Waiver of Section 1605 (Buy American Requirement) of the American Recovery...

    Science.gov (United States)

    2010-05-07

    ... experienced by the facility. The existing multistage centrifugal aeration blowers cannot be turned down sufficiently to adequately meet the low and average aeration requirements on the WWTP. These blowers also have insufficient capacity to meet the peak aeration requirements alone, and need supplemental aeration blowers...

  20. 78 FR 7306 - Energy Efficiency Program for Commercial and Industrial Equipment: Public Meeting and...

    Science.gov (United States)

    2013-02-01

    ... Meeting and Availability of the Framework Document for Commercial and Industrial Fans and Blowers AGENCY... considering energy conservation standards for commercial and industrial fans and blowers. To inform interested... Technologies Program, Mailstop EE-2J, Framework Document for Commercial and Industrial Fans and Blowers,...

  1. Retrofit device and method to improve humidity control of vapor compression cooling systems

    Energy Technology Data Exchange (ETDEWEB)

    Roth, Robert Paul; Hahn, David C.; Scaringe, Robert P.

    2016-08-16

    A method and device for improving moisture removal capacity of a vapor compression system is disclosed. The vapor compression system is started up with the evaporator blower initially set to a high speed. A relative humidity in a return air stream is measured with the evaporator blower operating at the high speed. If the measured humidity is above the predetermined high relative humidity value, the evaporator blower speed is reduced from the initially set high speed to the lowest possible speed. The device is a control board connected with the blower and uses a predetermined change in measured relative humidity to control the blower motor speed.

  2. Measurement of airflow in residential furnaces

    Energy Technology Data Exchange (ETDEWEB)

    Biermayer, Peter J.; Lutz, James; Lekov, Alex

    2004-01-24

    In order to have a standard for furnaces that includes electricity consumption or for the efficiency of furnace blowers to be determined, it is necessary to determine the airflow of a furnace or furnace blower. This study focused on airflow testing, in order to determine if an existing test method for measuring blower airflow could be used to measure the airflow of a furnace, under conditions seen in actual installations and to collect data and insights into the operating characteristics of various types of furnace blowers, to use in the analysis of the electricity consumption of furnaces. Results of the measured airflow on furnaces with three types of blower and motor combinations are presented in the report. These included: (1) a forward-curved blower wheel with a typical permanent split capacitor (PSC) motor, (2) a forward-curved blower wheel with an electronically-commutated motor (ECM), and (3) a prototype blower, consisting of a backward-inclined blower wheel matched to an ECM motor prototype, which is being developed as an energy-saving alternative to conventional furnace blowers. The testing provided data on power consumption, static and total pressure, and blower speed.

  3. Apartment building with controlled ventilation. East Germany: High-efficiency blowers provide fresh air for the heat recovery system of a new apartment building; Miethaus mit kontrollierter Wohnungslueftung. Beim Neubau einer ostdeutschen Wohnanlage erfolgt die Frischluftzufuhr der Waermerueckgewinnungsanlage ueber Hochleistungsluefter

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2000-11-01

    The Energy Conservation Ordinance contains specifications for energy conservation in the construction of new buildings and the modernisation of old ones. Ventilation is a crucial point. A wholesome room climate and fresh air are important factors in keeping the inhabitants healthy and well. [German] Bei Erstellung von Neubauten und der Sanierung von Altbauten sollten schon heute die Inhalte der aktuell gueltigen Energiesparverordnung beachtet werden. Sie soll bei der Einsparung von Energie sorgen. Doch besonders in Gebaeuden mit guter Waermedaemmung, insbesondere bei Niedrigenergiehaeusern, muss richtig be- und entlueftet werden. Ein wohliges Klima und gute Luft in Wohnraeumen sind wichtig fuer die Gesundheit der Bewohner. (orig.)

  4. Influence of shape change of impeller and scroll in the axial direction on performance and noise for multiblade blower; Tayoku sofuki no haneguruma oyobi scroll keijo no jiku hoko henka ga seino to soon ni oyobosu eikyo

    Energy Technology Data Exchange (ETDEWEB)

    Yanazaki, S.; Hashimoto, K.; Fukasaku, Y. [Hitachi, Ltd., Tokyo (Japan)

    1997-10-25

    In this paper, the influence of shape change of the impeller and scroll in the axial direction on performance and noise are investigated. It is shown that a 14% increase in the hub-side diameter of the impeller over that of the shroud side leads to a 4% increase in the efficiency {eta}t, and a 2dB reduction in the specific sound level SLs. It is also shown that an increase in the diffusion angle of the hub side of the scroll to that of the shroud side raises the efficiency by 2%. 8 refs., 10 figs.

  5. 核电厂蓄电池室排风电机轴断裂失效分析%Breakage Failure Analysis of Motor Shaft of Battery Room Exhaust Blower for Nuclear Power Plant

    Institute of Scientific and Technical Information of China (English)

    边春华; 徐科; 胡明磊; 苗学良

    2015-01-01

    核电厂蓄电池室排风机电机轴在日常运行时发生疲劳断裂,通过对失效电机轴的化学成分、断口宏观形貌、微观形貌、力学性能、金相组织、受力及运行工况等进行分析,阐述了电机轴断裂的机制.结果表明:电机轴运行中受到循环扭转应力,轴肩部位加工损伤、金相组织不够优良,未经调质处理是轴断裂的主要原因.

  6. 可调频高声强声波吹灰器在600MW机组空预器中的应用%Application of high intensity sonic soot blower in air preheater of 600 MW units

    Institute of Scientific and Technical Information of China (English)

    尤良洲

    2016-01-01

    通过现场试验结合DCS数据分析,评估可调频高声强声波吹灰器在桌600MW机组空预器上的应用.结果表明,可调频高声强声波吹灰器可在氨逃逸波动较大的情况下,有效控制空预器阻力的增长,保证机组运行.

  7. 锅炉鼓风机、引风机加装变频器的节能改造%The Boiler Blower and Fan Installation of Inverter for Energy-Saving Renovation

    Institute of Scientific and Technical Information of China (English)

    石凤霞; 李敏

    2013-01-01

    Using frequency converter to control the boiler drum and induced draft fan VVVF,it solves the problem of the energy waste, also reduces the labor intensity of operators,and extends the service life of the motor.%  用变频器对锅炉鼓、引风机进行了变频调速控制改造,解决了部分能源的浪费问题,也减轻了操作工的劳动强度,同时延长了电机的使用寿命。

  8. Matching the Proper Motor to Roots Blower in Sewage Treatment System%污水处理系统中的罗茨风机电机的选配

    Institute of Scientific and Technical Information of China (English)

    许海鹏

    2015-01-01

    实际工作中,选择电动机时往往只考虑功率与转速,对其它方面考虑较少,造成了直接的资源浪费。介绍除考虑功率与转速外,还需从电机的安装形式、起动方式和防护等级等多个方面作考虑,文章较全面的分析了电机选择过程中的关键因素,对正确选择电机有一定的参考价值。%When selecting the motor in practical work, only consideration often was the power and rotating speed of it while other factors often were neglected, resulting the direct waste of the resource. Actually, the consideration in-cluded the installation form, starting mode, protective type and etc. besides the power and rotating speed. A compre-hension summary of key factors to be attention when select-ing motors was introduced, as a useful reference to make a right selection of motors.

  9. DIAGNOSE OF VIBRATION BREAKDOWN OF BLOWER AND DISCUSSION ABOUT INSTALLATION OF ELECTRIC MOTOR%风机振动故障的诊断及电机安装技术探讨

    Institute of Scientific and Technical Information of China (English)

    赵永平

    2013-01-01

    结合宣钢公司炼铁厂三烧车间风机故障实例,分析了风机振动故障的可能原因,给出了处理对策,介绍了修复实践经验.对工厂设备管理、维护具有一定借鉴.

  10. 停运汽动风机高压加热器提高煤气锅炉效率的实践%Practice of Improving Gas Boiler Efficiency by Stopping the Steam-driven High Pressure Blower Heater

    Institute of Scientific and Technical Information of China (English)

    赵晓雷; 彭建军

    2015-01-01

    兴澄特钢一台SG-260/9.8-Q8501型全烧高炉煤气锅炉,利用停运对应的汽动鼓风机高压加热器,降低给水温度,从而降低锅炉排烟温度,达到节约蒸汽,提高锅炉效率的作用。%The SG 260/9.8 Q8501 type all-BFG boiler at Xingcheng Special Steel is introduced. Steam was saved and efficiency of the boiler was improved by shutting down the corresponding steam-driven high pressure fan heater to reduce the temperature of feed water and thereby lower the temperature of boiler flue gas.

  11. Optimization Design of Flow Passage and Blade of AV100-19 Axial Blower%AV100-19轴流式鼓风机扩容改造流道与叶片的优化设计

    Institute of Scientific and Technical Information of China (English)

    梁高林; 吴礼云; 凌晨

    2016-01-01

    利旧改造一台AV100-19轴流式鼓风机,通过设计计算增大流道外径、改变叶型、增加反动度,等技术手段,达到提高鼓风机风量、风压、优化风机性能的目标,满足新高炉的送风要求.

  12. 燃气锅炉鼓、引风机变频节能改造实践与分析%Practice and Analysis of Energy Saving Reconstruction of Blower Fan and Induced Draft Fan for Gas-fired Boiler

    Institute of Scientific and Technical Information of China (English)

    章建华; 徐小燕

    2012-01-01

    通常锅炉上的鼓、引风机都是电机以定速运转,再通过改变风机入口的档板开度来调节风量.而风机的最大特点是负载转矩与转速的平方成正比,而轴功率与转速的立方成正比,因此如将电机的定速运转改为根据需要的流量来调节电机的转速就可节约大量的电能.介绍了南通宝钢钢铁有限公司BFG锅炉鼓、引风机的变频改造项目.

  13. 汽轮鼓风机电动控制油泵故障分析及处理%Fault Analysis of Electric Controlled Oil Pump of Turbine Blower and Treatment

    Institute of Scientific and Technical Information of China (English)

    吴兴明

    2014-01-01

    介绍了汽轮鼓风机电动控制油泵联轴器减震垫损坏引起油泵内部故障的处理,抓好隐蔽油泵的周期管理,定期检查、更换油泵联轴器减震垫,确保了风机设备长周期稳定运行.

  14. 电磁悬浮轴承的发展及在鼓风机上的应用前景%Development of Magnetic Floating Bearing and Its Application Prospect for Blowers

    Institute of Scientific and Technical Information of China (English)

    王飏; 王军; 王瓯

    2008-01-01

    阐述了电磁轴承的基本原理及该种轴承的发展,对国内国外电磁轴承的技术研究和应用水平做了详细的比较,调研了电磁轴承在鼓风机上的应用情况,尤其结合企业的实际情况,得出电磁悬浮轴承完全具备应用在鼓风机、压缩机上的结论.

  15. NTS双吹瓶机气流传送带解决最复杂的装瓶(PET胶瓶)生产线%The NTS Dual- Blower Air Conveyor the Solution for the Most Complex PET Bottling Lines

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ 法国NTS双吹瓶机气流传送带的原理是:将胶瓶的机械自动定位功能和在瓶颈凸缘上下方分别鼓风两者结合起来,满足最复杂的装瓶(PET胶瓶)生产线的要求,因为这种生产线要求输送方式多样化,瓶子形状变化多,输送量大.

  16. Data Mining in Cyber Operations

    Science.gov (United States)

    2014-07-01

    FOR PUBLICATION IN ACCORDANCE WITH ASSIGNED DISTRIBUTION STATEMENT. FOR THE DIRECTOR: / S / / S / MISTY BLOWERS ...IN CYBER OPERATIONS 5a. CONTRACT NUMBER IN-HOUSE 5b. GRANT NUMBER N/A 5c. PROGRAM ELEMENT NUMBER 61102F 6. AUTHOR(S) Misty Blowers , Stefan...UU 18. NUMBER OF PAGES 19a. NAME OF RESPONSIBLE PERSON MISTY BLOWERS a. REPORT U b. ABSTRACT U c. THIS PAGE U 19b. TELEPHONE NUMBER (Include

  17. BPM Motors in Residential Gas Furnaces: What are theSavings?

    Energy Technology Data Exchange (ETDEWEB)

    Lutz, James; Franco, Victor; Lekov, Alex; Wong-Parodi, Gabrielle

    2006-05-12

    Residential gas furnaces contain blowers to distribute warm air. Currently, furnace blowers use either a Permanent Split Capacitor (PSC) or a Brushless Permanent Magnet (BPM) motor. Blowers account for the majority of furnace electricity consumption. Therefore, accurate determination of the blower electricity consumption is important for understanding electricity consumption of furnaces. The electricity consumption of blower motors depends on the static pressure across the blower. This paper examines both types of blower motors in non-condensing non-weatherized gas furnaces at a range of static pressures. Fan performance data is based on manufacturer product literature and laboratory tests. We use field-measured static pressure in ducts to get typical system curves to calculate how furnaces would operate in the field. We contrast this with the electricity consumption of a furnace blower operating under the DOE test procedure and manufacturer rated conditions. Furnace electricity use is also affected by operating modes that happen at the beginning and end of each furnace firing cycle. These operating modes are the pre-purge and post-purge by the draft inducer, the on-delay and off-delay of the blower, and the hot surface ignitor operation. To accurately calculate this effect, we use the number of firing cycles in a typical California house in the Central Valley of California. Cooling hours are not considered in the DOE test procedure. We also account for furnace blower use by the air conditioner and stand-by power. Overall BPM motors outperform PSC motors, but the total electricity savings are significantly less than projected using the DOE test procedure conditions. The performance gains depend on the static pressure of the household ducts, which are typically much higher than in the test procedures.

  18. 電動送風機の振動特性について

    OpenAIRE

    東,明彦; 水口,文洋; 加藤, 徹郎

    2010-01-01

    Many studies about the noise and the vibration of the blower are made so far. There are many problems about the noise and the vibration. However, there are little studies about the vibration and noise of a blower used under special environment such as the ship. Therefore, in this study, we examined it about the vibration characteristics of the electric blower which is used on the ship. Then, we investigated the cause of the abnormality phenomenon to occur during the driving of the electric bl...

  19. R-MCJ10042201-1A_PADT_PhaseII-report-final

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Mark Christian

    2010-04-22

    The thrust of this R&D effort was to develop technology that serves the SOFC industry and help developers in this industry to succeed. In particular this project focused on fluid handling equipment that supported the SOFC stack. Two devices were developed: the Hot Anode Recycle Blower (HARB) blower which will serve hot anode gas requirements in FutureGen demonstration units, and the small multi stage (SMS) blower which will serve warm anode and cathode gas requirements for SOFC and other fuel cell industries.

  20. 40 CFR 86.605-98 - Maintenance of records; submittal of information.

    Science.gov (United States)

    2010-07-01

    ... (CONTINUED) Selective Enforcement Auditing of New Light-Duty Vehicles, Light-Duty Trucks, and Heavy-Duty...) Refueling enclosure (refueling SHED). (1) Total internal volume. (2) Capacity of mixing blower. (3)...

  1. 78 FR 23527 - Revisions to the Arizona State Implementation Plan, Maricopa County Area

    Science.gov (United States)

    2013-04-19

    ... California Legislature on the Potential Health and Environmental Impacts of Leaf Blowers, California Air... authority to address disproportionate human health or environmental effects with practical, appropriate, and... of Subjects in 40 CFR Part 52 Environmental protection, Air pollution control,...

  2. 75 FR 44047 - Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals

    Science.gov (United States)

    2010-07-27

    ... of Sec. 158.29. PFC Applications Approved Public Agency: County and City of Spokane, Washington...--runway plow. Airfield friction tester. Snow removal equipment--airfield snow blower. PFC application...

  3. Multiple Flow Loop SCADA System Implemented on the Production Prototype Loop

    Energy Technology Data Exchange (ETDEWEB)

    Baily, Scott A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Wheat, Robert Mitchell [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-11-16

    The following report covers FY 15 activities to develop supervisory control and data acquisition (SCADA) system for the Northstar Moly99 production prototype gas flow loop. The goal of this effort is to expand the existing system to include a second flow loop with a larger production-sized blower. Besides testing the larger blower, this system will demonstrate the scalability of our solution to multiple flow loops.

  4. Inlet Channel for a Ducted Fan Propulsion System of a Light Aircraft

    Directory of Open Access Journals (Sweden)

    E. Ritschl

    2003-01-01

    Full Text Available So-called "cold-jet" propulsion units consist of a piston engine, a blower and the necessary air duct. Till now, all attempts to utilize "cold-jet" propulsion units to maintain the thrust of an airplane have been unsuccessful. Analysis has shown that the main difficulty is the deformation of the flow field at the entry to the blower [1].

  5. Modifications of the air filtering system of the turbo blower n.4` TS-4` and the air compressor n.6 `TC-6`; Modificacao do sistema de filtragem de ar do turbo soprador n.4 `TS-4` e compressor de ar n.6 `TC-6`

    Energy Technology Data Exchange (ETDEWEB)

    Amaro, Carlos Alberto Ferreira; Dias, Alex; Andrade, Raul Tavares de; Lopes, Francisco Jose; Ratto, Ricardo Silva; Vilarinho, Joao Clovis; Romao Junior, Wilson [Companhia Siderurgica Paulista (COSIPA), Cubatao, SP (Brazil)

    1996-12-31

    The passing of particulate material through the filtering systems damage the internal parts of the equipment, forming deposits, which reduce the performance of the machines. The tentative of preventing equipment damage forced frequently changes of filters, which caused problems to the operation and excessively costs of maintenance. This work presents a new filtering system adopted aiming to extend the equipment life time as well as the reduction in maintenance costs and energy economy 9 refs., 5 figs.

  6. Two of the most common vacuum generator for the modern papermaking vacuum system——Comprehensive comparison of water ring vacuum pump and turbine blower%造纸真空系统中两种常见的真空发生设备——水环真空泵和透平风机的综合比较

    Institute of Scientific and Technical Information of China (English)

    陈首挺

    2013-01-01

    水环真空泵和透平风机是现代造纸真空系统中最常见的两种真空发生设备,通过比较两者的发展历史、工作原理、结构特征和在造纸真空系统的应用特点,总结两者的优点和缺点,希望能给造纸行业的相关技术人员选用真空发生设备时提供参考.

  7. Performance Characterization of the Production Facility Prototype Helium Flow System

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dalmas, Dale Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-12-16

    The roots blower in use at ANL for in-beam experiments and also at LANL for flow tests was sized for 12 mm diameter disks and significantly less beam heating. Currently, the disks are 29 mm in diameter, with a 12 mm FWHM Gaussian beam spot at 42 MeV and 2.86 μA on each side of the target, 5.72 μA total. The target design itself is reported elsewhere. With the increased beam heating, the helium flow requirement increased so that a larger blower was need for a mass flow rate of 400 g/s at 2.76 MPa (400 psig). An Aerzen GM 12.4 blower was selected, and is currently being installed at the LANL facility for target and component flow testing. This report describes this blower/motor/pressure vessel package and the status of the facility preparations. Blower performance (mass flow rate as a function of loop pressure drop) was measured at 4 blower speeds. Results are reported below.

  8. CFD Analysis for Flow Behavior Characteristics in the Upper Plenum during low flow/low pressure transients for the Gas Cooled Fast Reactor (GCFR)

    Energy Technology Data Exchange (ETDEWEB)

    Piyush Sabharwall; Theron Marshall; Kevan Weaver; Hans Gougar

    2007-05-01

    Gas coolant at low pressure exhibits poor heat transfer characteristics. This is an area of concern for the passive response targeted by the Generation IV GCFR design. For the first 24 hour period, the decay heat removal for the GCFR design is dependent on an actively powered blower, which also would reduce the temperature in the fuel during transients, before depending on the passive operation. Natural circulation cooling initiates when the blower is stopped for the final phase of the decay heat removal, as under forced convection the core decay heat is adequately cooled by the running blower. The ability of the coolant to flow in the reverse direction or having recirculation, when the blowers are off, necessitates more understanding of the flow behavior characteristics in the upper plenum. The work done here focuses primarily on the period after the blower has been turned off, as the core is adequately cooled when the blowers are running, thus there was no need to carry out the analysis for the first 24 hours. In order to understand the plume behavior for the GCFR upper plenum several cases were run, with air, helium and helium-air mixture. For each case, the FLUENT was used to characterize the steady state velocity vectors and corresponding temperature in the upper plenum under passive decay heat removal conditions. This study will provide better insight into the plume interaction in the upper plenum at low flow and low pressure conditions.

  9. Multifamily Envelope Leakage Model

    Energy Technology Data Exchange (ETDEWEB)

    Faakye, Omari [Consortium for Advanced Residential Buildings, Norwalk, CT (United States); Griffiths, Dianne [Consortium for Advanced Residential Buildings, Norwalk, CT (United States)

    2015-05-08

    “The cost for blower testing is high, because it is labor intensive, and it may disrupt occupants in multiple units. This high cost and disruption deter program participants, and dissuade them from pursuing energy improvements that would trigger air leakage testing, such as improvements to the building envelope.” This statement found in a 2012 report by Heschong Mahone Group for several California interests emphasizes the importance of reducing the cost and complexity of blower testing in multifamily buildings. Energy efficiency opportunities are being bypassed. The cost of single blower testing is on the order of $300. The cost for guarded blower door testing—the more appropriate test for assessing energy savings opportunities—could easily be six times that, and that’s only if you have the equipment and simultaneous access to multiple apartments. Thus, the proper test is simply not performed. This research seeks to provide an algorithm for predicting the guarded blower door test result based upon a single, total blower door test.

  10. Forced-air warming: a source of airborne contamination in the operating room?

    Directory of Open Access Journals (Sweden)

    David Leaper

    2009-12-01

    Full Text Available Forced-air-warming (FAW is an effective and widely used means for maintaining surgical normothermia, but FAW also has the potential to generate and mobilize airborne contamination in the operating room. We measured the emission of viable and non-viable forms of airborne contamination from an arbitrary selection of FAW blowers (n=25 in the operating room. A laser particle counter measured particulate concentrations of the air near the intake filter and in the distal hose airstream. Filtration efficiency was calculated as the reduction in particulate concentration in the distal hose airstream relative to that of the intake. Microbial colonization of the FAW blower’s internal hose surfaces was assessed by culturing the microorganisms recovered through swabbing (n=17 and rinsing (n=9 techniques. Particle counting revealed that 24% of FAW blowers were emitting significant levels of internally generated airborne contamination in the 0.5 to 5.0 mm size range, evidenced by a steep decrease in FAW blower filtration efficiency for particles 0.5 to 5.0 mm in size. The particle size-range-specific reduction in efficiency could not be explained by the filtration properties of the intake filter. Instead, the reduction was found to be caused by size-range-specific particle generation within the FAW blowers. Microorganisms were detected on the internal air path surfaces of 94% of FAW blowers. The design of FAW blowers was found to be questionable for preventing the build-up of internal contamination and the emission of airborne contamination into the operating room. Although we did not evaluate the link between FAW and surgical site infection rates, a significant percentage of FAW blowers with positive microbial cultures were emitting internally generated airborne contamination within the size range of free floating bacteria and fungi (<4 mm that could, conceivably, settle onto the surgical site.

  11. Dynamic Analysis of Foundation Supporting Rotary Machine

    Directory of Open Access Journals (Sweden)

    Utkarsh S. Patel

    2015-08-01

    Full Text Available With the advancement of technology in the field of industry, high speed machinery has been developed. As the speed of machinery has increased, vibrations also increased. Machines transmit vibrations to the structure supporting them. Hence, it is important to design and develop such structure which sustains the vibrations of machinery. Hence, in this study it has been aimed to execute the study on foundations supporting rotary type of machine like blower. In this paper, the most important parameters like frequency and amplitude are considered while execution of analysis of machine foundation supporting blower type machine. This paper shows, better interface between foundation designer and machine manufacturer for better performance of machine. The design aids/approaches for foundation design is also described in this paper and an attempt has been made to study the dynamic behaviour of a foundation structure for blower type machine subjected to forces due to operation of blower machine. Two different types of foundations for Rotary type Machine that is Blower have been studied in this paper

  12. Energy consumption in terms of shear stress for two types of membrane bioreactors used for municipal wastewater treatment processes

    Science.gov (United States)

    Ratkovich, Nicolas; Bentzen, Thomas R.; Rasmussen, Michael R.

    2012-10-01

    Two types of submerged membrane bioreactors (MBR): hollow fiber (HF) and hollow sheet (HS), have been studied and compared in terms of energy consumption and average shear stress over the membrane wall. The analysis of energy consumption was made using the correlation to determine the blower power and the blower power demand per unit of permeate volume. Results showed that for the system geometries considered, in terms the of the blower power, the HF MBR requires less power compared to HS MBR. However, in terms of blower power per unit of permeate volume, the HS MBR requires less energy. The analysis of shear stress over the membrane surface was made using computational fluid dynamics (CFD) modelling. Experimental measurements for the HF MBR were compared with the CFD model and an error less that 8% was obtained. For the HS MBR, experimental measurements of velocity profiles were made and an error of 11% was found. This work uses an empirical relationship to determine the shear stress based on the ratio of aeration blower power to tank volume. This relationship is used in bubble column reactors and it is extrapolate to determine shear stress on MBR systems. This relationship proved to be overestimated by 28% compared to experimental measurements and CFD results. Therefore, a corrective factor is included in the relationship in order to account for the membrane placed inside the bioreactor.

  13. Building America Case Study: Predicting Envelope Leakage in Attached Dwellings (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2014-12-01

    'The cost for blower testing is high, because it is labor intensive, and it may disrupt occupants in multiple units. This high cost and disruption deters program participants, and dissuades them from pursuing energy improvements that would trigger air leakage testing, such as improvements to the building envelope.' This statement found in a 2012 report by Heschong Mahone Group emphasizes the importance of reducing the cost and complexity of blower testing in multifamily buildings. Energy efficiency opportunities are being bypassed. The cost of single blower testing is on the order of $300. The cost for guarded blower door testing, the more appropriate test for assessing energy savings opportunities, could easily be six times that and that's only if you have the equipment and simultaneous access to multiple apartments. Thus, the proper test is simply not performed. The objective of the 2013 research project was to develop the model for predicting fully guarded test results (FGT), using unguarded test data and specific building features of apartment units. The model developed has a coefficient of determination R2 value of 0.53 with a root mean square error (RMSE) of 0.13. Both statistical metrics indicate that the model is relatively strong. When tested against data that was not included in the development of the model, prediction accuracy was within 19%, which is reasonable given that seasonal differences in blower door measurements can vary by as much as 25%.

  14. High efficiency stoichiometric internal combustion engine system

    Science.gov (United States)

    Winsor, Richard Edward; Chase, Scott Allen

    2009-06-02

    A power system including a stoichiometric compression ignition engine in which a roots blower is positioned in the air intake for the engine to control air flow. Air flow is decreased during part power conditions to maintain the air-fuel ratio in the combustion chamber of the engine at stoichiometric, thus enabling the use of inexpensive three-way catalyst to reduce oxides of nitrogen. The roots blower is connected to a motor generator so that when air flow is reduced, electrical energy is stored which is made available either to the roots blower to temporarily increase air flow or to the system electrical load and thus recapture energy that would otherwise be lost in reducing air flow.

  15. AN EXPERIMENTAL STUDY ON A VAPOR COMPRESSION REFRIGERATION CYCLE BY ADDING INTERNAL HEAT EXCHANGER

    Directory of Open Access Journals (Sweden)

    Muhammad Asmail Eleiwi

    2013-05-01

    Full Text Available Thispaper presents practical study to improve the indication COP of a vaporcompression refrigeration cycle in instrumented automobile air conditioner bydesigning internal heat exchanger and installing it in the vapor compressionrefrigeration cycle.  Two cases of  vapor compression refrigeration cycle were takenin this paper:  the first case is thatthe vapor compression refrigeration cycle without internal heat exchanger andin  the second case the vapor compressionrefrigeration cycle with heat exchanger ; in these two cases, the temperatureat each point of  a vapor compressionrefrigeration cycle, the low and the high pressure ,the indoor temperature andthe outdoor temperature were measured at each time at compressor speed 1450 rpmand 2900 rpm for each blower speed 1, blower speed 2 and blower speed 3.Therefrigerant fluid was used in the vapor compression refrigeration cycle withoutIHE and with IHE is R134a..

  16. DC Motor Load Analysis and Cooling Consideration to Optimise the Power Consumption- Case Study

    Directory of Open Access Journals (Sweden)

    Mr. K.G. Bante

    2013-06-01

    Full Text Available The need of energy conservation is the increased requirement of all industries as the cost of the energy increasing day by day. DC motors have been the workhorse of variable speed drives in the continuous steel rolling mills for many years. DC motors in the steel rolling mills are usually separately ventilated by providing air blower, heat exchanger and water. Cooling air is circulated inside the motor by air blower. Water circulates through the heat exchanger and cools the air. Energy consumption by the air blower plays a vital role in optimizing the energy consumption. This article indicates that the loading pattern of the DC motor should decide the control strategy for effective and efficient cooling arrangement.

  17. The Co-evolution Model of Transform from Servitization of Manufacturing to the Provider of Services——A Case Study Based on Xi'an ShanGu Blower Group%制造业企业向服务提供商转变的共演模型——基于陕西鼓风机(集团)有限公司的案例研究

    Institute of Scientific and Technical Information of China (English)

    赵勇; 齐讴歌

    2012-01-01

    以陕西鼓风机集团为案例,采用共演模型展现制造业企业服务化过程中市场环境与服务设计的共演过程.从制造业服务化过程来看,陕鼓根据市场和竞争者的变化,公司高层经营理念发生变化,进而形成公司的服务目标和战略,并根据服务化理念及战略进行技术研发和组织结构调整,最终设计服务内容.从服务化过程与保障因素之间的作用机制及相互影响来看,在不断进行技术研发的过程中延伸服务范围和内容,即技术研发与服务设计密切相关并协同发展.

  18. Seacoaster advanced marine vehicle. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Burg, D.

    1998-08-18

    The Seacoaster combines the high efficiencies of Surface Effect Ships (SES) with simple catamaran hull construction. It has blower pressurized air cushions that support some 80-90 percent of displacement and hence the high efficiencies. However, unlike the SES, there are no expensive and high maintenance flexible seals. Each catamaran sidehull has a simple recess molded or built into its underside. Powered blowers direct pressurized air into such recesses and thereby create lifting air cushions. There are no flexible seals of any kind and there is no air cushion between the sidehulls. Extensive towed model tests were conducted that showed the viability of the invention.

  19. Energy Consumption in Terms of Shear Stress for Two Types of Membrane Bioreactors Used for Municipal Wastewater Treatment Processes

    DEFF Research Database (Denmark)

    Ratkovich, Nicolas Rios; Bentzen, Thomas Ruby; Bérube, P.R.

    2011-01-01

    Two types of submerged membrane bioreactors (MBR): Hollow Fiber (HF) and Hollow Sheet (HS), have been studied and compared in terms of energy consumption and average shear stress over the membrane wall. The analysis of energy consumption was made using the correlation to determine the blower power...... that the CFD results for the HS MBR were accurate. A linear empirical correlation between the average shear stress and the blower power per unit of permeate was made. This relationship includes: the air flow rate, the geometrical dimensions of the MBR, the permeate flux and the membrane area and can be used...

  20. Energy Consumption Related to Shear Stress for Membrane Bioreactors Used for Wastewater Treatment

    DEFF Research Database (Denmark)

    Ratkovich, Nicolas Rios; Bentzen, Thomas Ruby; Bérube, P.R.

    2011-01-01

    . A linear empirical correlation between the average shear stress and the blower power per unit of permeate was made. This work uses an empirical relationship to determine the shear stress based on the ratio of aeration blower power to tank volume. This relationship is used in bubble column reactors...... and it is extrapolate to determine shear stress on MBR systems. It was found that this relationship is over predictive by 28 % compared to experimental measurements and CFD results. Therefore a correction factor is included on the relationship to account for the membrane placed inside the bioreactor....

  1. Investigation and Retrofitting Proposal for a Panbo Type House in Sisimiut, Greenland

    DEFF Research Database (Denmark)

    Qu, Jing; Vladyková, Petra; Villumsen, Arne

    House’ was carried out in August 2011, including collection of original documentation, visual inspection, blower-door test, thermography test, the indoor climate monitoring, questionnaire and interview with the occupants. The indoor climate, including temperature and relative humidity, has been recorded...

  2. Comparison of Indoor Residual Spray Equipment for Malaria Control in Liberia.

    Science.gov (United States)

    Obenauer, Peter J; Farooq, Mohammad; Knapp, Jennifer A; Yans, Matthew W; Santana, Luis A; Richardson, Alec G; Nador, Nadoris N; Diclaro, Joseph W

    2015-12-01

    We describe and compare a new innovative backpack compressed-air sprayer (JQSX-12) to a Stihl® 450 backpack mist blower and a manually operated compression sprayer for its effectiveness as an alternative operational tool for indoor residual insecticide application to control malaria in Liberia. Advantages and physical characteristics of each sprayer and their spray atomization parameters are discussed.

  3. 10 CFR Appendix C to Part 110 - Illustrative List of Gaseous Diffusion Enrichment Plant Assemblies and Components Under NRC...

    Science.gov (United States)

    2010-01-01

    ... Gas Blowers Especially designed or prepared axial, centrifugal, or positive displacement compressors... may be either rotary or positive displacement, may have fluorocarbon seals, and may have special...) Especially designed or prepared large vacuum manifolds, vacuum headers and vacuum pumps having a...

  4. 10 CFR Appendix D to Part 110 - Illustrative List of Aerodynamic Enrichment Plant Equipment and Components Under NRC Export...

    Science.gov (United States)

    2010-01-01

    ...) Compressors and gas blowers. Especially designed or prepared axial, centrifugal, or positive displacement... each stage or group of stages connected to each of the headers. (9) Vacuum systems and pumps... vacuum manifolds, vacuum headers and vacuum pumps, and designed for service in UF6-bearing...

  5. Opposed Bellows Would Expel Contents Of Tank

    Science.gov (United States)

    Whitaker, Willie

    1994-01-01

    Proposed storage tank contains two pairs of opposed bellows used to expel its contents. Storage and expulsion volumes of tank same as those of older version of tank equipped with single bellows. Four bellows offer greater stability. Applications include automobile cooling systems and gasoline-powered tools like chain saws and leaf blowers.

  6. SR450 and Superhawk XP applications of Bacillus thuringiensis israelensis de Barjac against Culex quinquefasciatus Say

    Science.gov (United States)

    Sprayer comparisons and larval morality assays were conducted following SR450 backpack mist blower and Superhawk XP thermal fogger applications of Vectobac® WDG Bacillus thuringiensis israelensis (Bti) de Barjac against Culex quinquefasciatus Say. Bacillus thuringiensis israelensis was applied at m...

  7. Minimizing noise in fiberglass aquaculture tanks: Noise reduction potential of various retrofits

    Science.gov (United States)

    Equipment used in intensive aquaculture systems, such as pumps and blowers can produce underwater sound levels and frequencies within the range of fish hearing. The impacts of underwater noise on fish are not well known, but limited research suggests that subjecting fish to noise could result in imp...

  8. Enterobacteriaceae and related organisms recovered from biofilms in a commercial shell egg processing facility.

    Science.gov (United States)

    During six visits, biofilms from egg contact and non-contact surfaces in a commercial shell egg processing facility were sampled. Thirty-five different sample sites were selected: Pre-wash and wash tanks (lids, screens, tank interiors, nozzle guards), post-wash spindles, blower filters, belts (far...

  9. Characterization and quantification of deposits build up and removal in straw suspension fired boilers

    DEFF Research Database (Denmark)

    Jensen, Peter Arendt; Shafique Bashir, Muhammad; Wedel, Stig;

    : 1) The influence of local boiler conditions on deposit formation in suspension fired boilers using wood or co-firing straw and wood, 2) quantification of deposit removal in biomass suspension firing boilers with regards both to natural shedding and soot blower induced shedding, 3) established...

  10. Wacky Weather

    Science.gov (United States)

    Sabarre, Amy; Gulino, Jacqueline

    2013-01-01

    What do a leaf blower, water hose, fan, and ice cubes have in common? Ask the students who participated in an integrative science, technology, engineering, and mathematics (I-STEM) education unit, "Wacky Weather," and they will tell say "fun and severe weather"--words one might not have expected! The purpose of the unit…

  11. How an Air Stream Can Support a Cupcake

    Science.gov (United States)

    Jones, Evan

    2015-01-01

    Variations of a demonstration in which a sheet of paper or a bead is levitated in a grazing stream as from one's breath have been published in several sources. Even a massive ball can be deflected into the robust flow from a leaf blower. The attraction is surprising because it is often quite stable and seems to conflict with the familiar transient…

  12. 7 CFR 1767.20 - Plant accounts.

    Science.gov (United States)

    2010-01-01

    ... accessories, induced and forced draft fans, air ducts, combustion control mechanisms, and associated motors or... apparatus, including blowers, drive equipment, air ducts, not a part of building, louvers, pumps, and hoods... equipment, air ducts not a part of building, louvers, pumps, and hoods. 2. Circulating pumps,...

  13. Attacks by “Anonymous” WikiLeaks Proponents not Anonymous

    NARCIS (Netherlands)

    Pras, Aiko; Sperotto, Anna; Moura, Giovane C.M.; Drago, Idilio; Barbosa, Rafael; Sadre, Ramin; Schmidt, Ricardo; Hofstede, Rick

    2010-01-01

    On November 28, 2010, the world started watching the whistle blower website WikiLeaks to begin publishing part of the 250,000 US Embassy Diplomatic cables. These confidential cables provide an insight on U.S. international affairs from 274 different embassies, covering topics such as analysis of hos

  14. Smoke Management on FFG 7 Class Ships - An Evaluation of Smoke Removal Diagrams and Procedures on USS CLIFTON SPRAGUE (FFG 16).

    Science.gov (United States)

    1987-08-01

    simulated using a "Red Devil" blower, a bypass valve, and a Meriam flowmeter, as shown in Figure 2. Smoke was generated and injected into the selected space...the smoke containment test. The air flow rate was monitored by the Meriam flowmeter. SF6 and smoke generator output (low/high) was adjusted with air

  15. 42 CFR 84.143 - Terminal fittings or chambers; Type B supplied-air respirators; minimum requirements.

    Science.gov (United States)

    2010-10-01

    ... respirators; minimum requirements. 84.143 Section 84.143 Public Health PUBLIC HEALTH SERVICE, DEPARTMENT OF... RESPIRATORY PROTECTIVE DEVICES Supplied-Air Respirators § 84.143 Terminal fittings or chambers; Type B supplied-air respirators; minimum requirements. (a) Blowers or connections to air supplies...

  16. 42 CFR 84.147 - Type B supplied-air respirator; minimum requirements.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Type B supplied-air respirator; minimum... DEVICES Supplied-Air Respirators § 84.147 Type B supplied-air respirator; minimum requirements. No Type B supplied-air respirator shall be approved for use with a blower or with connection to an air supply...

  17. 30 CFR 75.341 - Direct-fired intake air heaters.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Direct-fired intake air heaters. 75.341 Section... air heaters. (a) If any system used to heat intake air malfunctions, the heaters affected shall switch off automatically. (b) Thermal overload devices shall protect the blower motor from overheating....

  18. Brushless dc motors. [applications in non-space technology

    Science.gov (United States)

    1975-01-01

    Brushless dc motors were intensively developed and tested over several years before qualification as the prime movers for Apollo Spacecraft life support blowers, and for circulating oxygen in the lunar portable life support system. Knowledge gained through prototype development and critical testing has significantly influenced the technology employed, broadened markets and applications, and reduced the cost of present day motors.

  19. 10 CFR 430.2 - Definitions.

    Science.gov (United States)

    2010-01-01

    ... energy consumption. (4) With respect to clothes dryers, which have the same primary energy source, which... heated air is circulated by means of a fan or blower. Electric clothes dryer means a cabinet-like appliance designed to dry fabrics in a tumble-type drum with forced air circulation. The heat source...

  20. A Call to Revitalize the Engines of Government

    Science.gov (United States)

    2008-01-01

    administration of the 1990s reflected more the thinking of Reagan Republicans than the traditional policies of the Democratic Party ( Krugman , 1994). The...Backlog of Cases Alleging Fraud: Whistle-Blower Suits Languish at Justice,” Washington Post, July 2, 2008. Krugman , Paul, Peddling Prosperity, New York

  1. 78 FR 26544 - Energy Efficiency Program for Commercial and Industrial Equipment: Public Meeting and...

    Science.gov (United States)

    2013-05-07

    ... commercial and industrial fan and blower equipment that published on February 1, 2013, (78 FR 7306) is... amended (76 FR 37628, June 28, 2011). As part of its further consideration of this determination, DOE is... availability of the framework document to consider such standards (78 FR 7306, Feb. 1, 2013). The...

  2. 40 CFR 63.1579 - What definitions apply to this subpart?

    Science.gov (United States)

    2010-07-01

    ... bed to improve feedstock quality for additional processing; and the catalyst or contact material is... riser, reactor, regenerator, air blowers, spent catalyst or contact material stripper, catalyst or... chemical structure of naphtha into higher octane aromatics through the use of a metal catalyst and...

  3. Clearance Analysis and Leakage Flow CFD Model of a Two-Lobe Multi-Recompression Heater

    Directory of Open Access Journals (Sweden)

    Ashish M. Joshi

    2006-01-01

    Full Text Available This paper reports the results of a study on multi-recompression heating. This process employs a Roots-type mechanism to heat gases to very high temperatures by compressive gas heating. A CFD model predicting the leakage flows in the machine was developed, and an excellent comparison with experimental data taken on a two-lobe Roots blower was obtained. A “clearance analysis” was performed to show that the clearance between the impellers remains constant for 96% of the angles of rotation. Assuming a quasi-steady state, the CFD simulation was performed for a single angle of rotation. A three-dimensional analysis showed that the flow field is identical along the rotor length, except for the leakage through the end plates. Hence, the model was further simplified to a two-dimensional analysis. This research may provide guidance in predicting the leakage flows in other blowers of the same kind with a different geometry.

  4. Absorber-evaporator unit for an absorption-refrigeration system

    Energy Technology Data Exchange (ETDEWEB)

    Hallatt, R.J.; Rorschach, R.L.

    1965-01-26

    This low temperature absorption-refrigeration system uses an absorber-evaporator. A conduit is connected between the upper portion of the absorber and the lower portion of the evaporator to conduct inert gas from the absorber to the evaporator. A second conduit connects the upper portion of the evaporator to the lower portion of the absorber and a blower in this conduit circulates the inert gas through the closed system. By placing the blower between the evaporator ad the absorber, the pressure in the evaporator is maintained at a minimum so that the working temperature is as low as possible. The medium to be cooled by the refrigerant is circulated through a heat exchanger located within the evaporator, whereby the latent heat of vaporization of the liquid refrigerant is employed to cool the outside medium. (2 claims)

  5. 增压器

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Blower Drive System Based on Synchronous Motor With Solid Salient-Pole Rotor: Performance Under Starting and Voltage Sag Conditions;Centrifugal blower's parameters optimization by condition of inlet pressure suppression;Component tolerances impact on critical clearances for Ford Fiesta supercharger; exhaust assemblyDemisting of vehicle air intake using plane baffles;DESIGN AND EVALUATION OF A CORN SILAGE HARVESTER USING SHREDDING AND FLAIL CUTTING; Design of a Radiator Cooling Fan for Passenger Cars (First Report) - Axial-Flow Design for an Axial-Flow Fan Operating in Mixed-Flow State with Reverse Flow; Design of a Radiator Cooling Fan for Passenger Cars (Second Report) - Mixed-Flow Design for an Axial-Flow Fan Operating in Mixed-Flow State with Reverse Flow; Development and evaluation of a down-the-row boom sprayer attachment to power tiller;

  6. Intelligent soot blowing for boilers co-firing waste and biofuel; Behovsstyrd sotblaasning foer bio- och avfallseldade pannor - inventering och teknikval

    Energy Technology Data Exchange (ETDEWEB)

    Kjoerk, Anders [S.E.P. Scandinavian Energy Project AB, Goeteborg (Sweden)

    2003-11-01

    To achieve optimum boiler operation and performance it is necessary to control the cleanliness and limit the fouling of the heat transfer surfaces. Historically, the heating surfaces in boilers firing biomass and waste are cleaned by steamblowing soot blowers on scheduled time-based and/or parameter-based intervals or by mechanical methods. With the advent of fuel switching strategies and use of mixed-in industrial waste, the control of heating surface cleanliness has become even more crucial for these boilers. Scheduled and/or parameter based approaches do not easily address operational changes. As plant operators push to achieve greater efficiency and performance from their boilers, the ability to more effectively optimize cleaning cycles has become increasingly important. If soot blowing is done only when and where it is required rather than at set intervals, unit performance can be maintained with reduced blowing, which saves steam. Two philosophical approaches toward intelligent soot blowing are currently being applied in the industry. One incorporates heat flux monitors to gather real-time heat transfer data to determine which areas of the furnace need cleaning. The other uses indirect temperature and pressure data to infer locations where soot blowing is needed, and is mainly applied for controlling soot blowers in the superheater and economiser area. The heat flux monitors are so fare used for control of the furnace wall blowers. A system using temperature, pressure and flow data does not require much additional instrumentation as compared with what is available on a standard boiler. However the blower control system must be capable of operating blowers on an individual basis. For advanced options it should also be possible to adjust the speed of the soot blower and the steam pressure. The control program could be more or less advanced but the ability to model heating surfaces and determine real-time cleanliness is crucial for an intelligent soot blowing

  7. Energy Consumption in Terms of Shear Stress for Two Types of Membrane Bioreactors used for Municipal Wastewater Treatment Processes

    DEFF Research Database (Denmark)

    Ratkovich, Nicolas Rios; Bentzen, Thomas Ruby; Rasmussen, Michael R.

    2012-01-01

    Two types of submerged membrane bioreactors (MBR): hollow fiber (HF) and hollow sheet (HS), have been studied and compared in terms of energy consumption and average shear stress over the membrane wall. The analysis of energy consumption was made using the correlation to determine the blower power...... of 11% was found. This work uses an empirical relationship to determine the shear stress based on the ratio of aeration blower power to tank volume. This relationship is used in bubble column reactors and it is extrapolate to determine shear stress on MBR systems. This relationship proved...... to be overestimated by 28% compared to experimental measurements and CFD results. Therefore, a corrective factor is included in the relationship in order to account for the membrane placed inside the bioreactor....

  8. Radiation protection during dismantling. An overview; Strahlenschutz beim Rueckbau. Ein Ueberblick

    Energy Technology Data Exchange (ETDEWEB)

    Nagels, Sven [TUEV Rheinland Industrie Service GmbH, Koeln (Germany). Geschaeftsfeld Strahlenschutz

    2013-08-01

    During dismantling of nuclear facilities the upmost aim is the radiation protection of the public and the personnel within and outside the facility. Specific requirements concerning the selection of cutting, dismantling and decontamination techniques and the ventilation devices are reviewed. The contribution covers special technologies for remote handling the reduction of external radiation exposure, the prevention of contamination spreading, release of buildings with respect to contamination, separate filtering devices with suction blowers, regular training with practical exercise, and experiences from other facilities.

  9. Dense Non Aqueous Phase Liquid (DNAPL) Removal from Fractured Rock using Thermal Conductive Heating (TCH)

    Science.gov (United States)

    2013-01-01

    Moisture knockout pot Blower Bag Filter Existing groundwater treatment system Heater and vacuum wells (15 in total) Heat exchanger Pump Treatment...heterogeneity. Figure 1. Proprietary TerraTherm heater element. The metal rod has a diameter of approximately 0.5 inches. The white beads are ceramic ...area foot-print Temperature and pressure monitoring holes (5 in total) Power Supply Filter Granular Activated Carbon Vessels 12 • The technology

  10. Different Boosting Systems and their Control Strategies for a Spark Ignition Internal Combustion Engine

    OpenAIRE

    Bolehovský Ondřej; Macek Jan

    2016-01-01

    This research uses 1-D simulation in GT-Power for evaluation of boosting systems for a spark ignition engine. Exhaust gas driven (waste-gated turbocharger) and mechanical driven (Roots blower) boosting systems are assessed in both steady state and transient modes in terms of performance, efficiency, fuel consumption, drivability, energy distribution and other aspects that influence gas exchange phase. Moreover, different boost control strategies, particularly at partial load, are also evaluat...

  11. Laryngocele A Review

    Directory of Open Access Journals (Sweden)

    Balasubramanian Thiagarajan

    2015-03-01

    Full Text Available Laryngocele is a rare condition characterized by benign dilatation of laryngeal saccule. It may be asymptomatic in a majority of patients, but could present with neck swelling, hoarseness, cough and stridor. Clinically three types of Laryngocele have been documented i.e. Internal, External and Combined. Old published literature suggests that this condition is common in glass blowers. This article attempts to re-view published literature in the scenario of author’s experience with 3 cases.

  12. Production Facility System Reliability Analysis Report

    Energy Technology Data Exchange (ETDEWEB)

    Dale, Crystal Buchanan [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Klein, Steven Karl [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-10-06

    This document describes the reliability, maintainability, and availability (RMA) modeling of the Los Alamos National Laboratory (LANL) design for the Closed Loop Helium Cooling System (CLHCS) planned for the NorthStar accelerator-based 99Mo production facility. The current analysis incorporates a conceptual helium recovery system, beam diagnostics, and prototype control system into the reliability analysis. The results from the 1000 hr blower test are addressed.

  13. CDC Vital Signs–Too Loud for Too Long!

    Centers for Disease Control (CDC) Podcasts

    2017-02-07

    This podcast is based on the February 2017 CDC Vital Signs report. Being around too much loud noise—like a leaf blower or rock concert—can cause permanent hearing loss. Learn how to prevent hearing loss.  Created: 2/7/2017 by National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP).   Date Released: 2/7/2017.

  14. Energy analysis of the engineering-economic optimization of convective heat-transfer surfaces

    Science.gov (United States)

    Stoyanov, N. M.

    1991-07-01

    The influence of the specific costs of the heat transfer surface, 1 kW of installed power of the blower and motor, 1 kW·h of electrical energy consumption by it, operating time of the surface, and other factors on the optimum specific power expenditure to force heat-transfer fluids through the ducts of heattransfer surfaces is investigated. The minimum engineering-economically justified operating time of the surface is determined.

  15. Evaluation of Military Fuels Using a Ford 6.7L Powerstroke Diesel Engine

    Science.gov (United States)

    2011-08-01

    exhaust is drawn from the engine by the buildings exhaust handling system and discharged outside to the atmosphere. A butterfly valve was used to regulate... butterfly valve to control engine exhaust back pressure, and then ducted into the laboratory exhaust blower system for removal. Fuel was supplied to...supplied at ambient conditions utilizing the factory engine air box and ducting. Engine exhaust was routed from the test cell through a butterfly valve to

  16. Boiler Stack Gas Heat Recovery

    Science.gov (United States)

    1987-09-01

    recover about 17 million Btu/hr. The fact that the exhaust gas was loaded with fiber made the spray recu- perator a prime candidate since it could also wash... properties of water, heating feedwater is more effective than heating air. Research in heat-recovery material technology has identified materials which are...and Acidic fluids up to 180 OF. Piping Fans and Blowers 350 OF flue gas. Scrubbers 300 to 350 OF bagasse flue gas, trash burner flue gas. Electrostatic

  17. Temperature variations in an air exposed pipe for periodic changing flow. Cambios de temperatura en una tuberia expuesta a la atmosfera y con circulacion intermitente del fluido

    Energy Technology Data Exchange (ETDEWEB)

    Sanchis, A.

    1994-01-01

    The effects of the climatic conditions on the temperature of a pipe exposed to heating-cooling cyclic changes are studied. The fundamentals of the mathematical model used are described and the model it self is applied to the blower-gas holder linking pipe in the transport of BOF gas. The extreme values for the pipe temperature, their development according, to time and to the length of the pipe and the most probable range of changes are obtained. (Author) 5 refs.

  18. Outcomes on the Spray Profiles Produced by the Feasible Adjustments of Commonly Used Sprayers in “Tendone” Vineyards of Apulia (Southern Italy)

    OpenAIRE

    Simone Pascuzzi

    2016-01-01

    The objective of the research was to assess the outcomes on the spray patterns produced by the different feasible adjustments of two different air blast sprayers and one mist blower sprayer, commonly employed for treatments to Apulian “tendone” vineyards. The spray profiles of these machines and the respective refinements affected by the alteration of the available adjusting devices were evaluated using a test bench, suitably set up for calibrating the sprayers used inside such vines. The air...

  19. Too Loud for Too Long! PSA (:60)

    Centers for Disease Control (CDC) Podcasts

    2017-02-07

    This 60 second public service announcement is based on the February 2017 CDC Vital Signs report. Being around too much loud noise—like a leaf blower or rock concert—can cause permanent hearing loss. Learn how to prevent hearing loss.  Created: 2/7/2017 by National Institute for Occupational Safety and Health (NIOSH).   Date Released: 2/7/2017.

  20. Reduction of Carbon Dioxide in Filtering Facepiece Respirators with an Active-Venting System: A Computational Study

    OpenAIRE

    2015-01-01

    During expiration, the carbon dioxide (CO2) levels inside the dead space of a filtering facepiece respirator (FFR) increase significantly above the ambient concentration. To reduce the CO2 concentration inside the dead space, we attach an active lightweight venting system (AVS) comprising a one-way valve, a blower and a battery in a housing to a FFR. The achieved reduction is quantified with a computational-fluid-dynamics model that considers conservation of mass, momentum and the dilute spec...

  1. The Enemy Below: Preparing Ground Forces for Subterranean Warfare

    Science.gov (United States)

    2013-12-01

    can endanger the lives of U.S. forces and render mechanical breaching tools inoperable. Air blowers can be used as a hasty means to ventilate a... Penguin Books, 1996). 179 Tom Mangold, The Tunnels of Cu Chi (New York, NY: Random House, 1985). 147 6. A Historical Analysis of Tunnel Warfare and... Penguin Group, 1996. 157 Lester, W. G., & Ali, A. J. “Underground Combat: Stereophonic Blasting, tunnel Rats, and the Soviet-Afghan War.” Engineer

  2. System design package for SIMS prototype system 4, solar heating and domestic hot water

    Science.gov (United States)

    1978-01-01

    The system consisted of a modular designed prepackaged solar unit, containing solar collectors, a rock storage container, blowers, dampers, ducting, air-to-water heat exchanger, DHW preheat tank, piping, and system controls. The system was designed to be installed adjacent to a small single family dwelling. The description, performance specification, subsystem drawings, verification plan/procedure, and hazard analysis of the system were packaged for evaluation.

  3. Power Output and Air Requirements of a Two-stroke Cycle Engine for Aeronautical Use

    Science.gov (United States)

    Paton, C R; Kemper, Carlton

    1927-01-01

    This investigation was undertaken to determine the pressure and amount of air necessary for satisfactory high-speed, two-stroke cycle operation and thus permit the power requirements of the air pump or blower to be determined. Based on power output and air requirement here obtained the two-stroke cycle engine would seem to be favorable for aeronautical use. No attempts were made to secure satisfactory operation at idling speeds.

  4. An experimental study of a pin-fin heat exchanger

    OpenAIRE

    Ramthun, David L.

    2003-01-01

    Approved for public release; distribution is unlimited A detailed experimental study has been carried out on the heat transfer and pressure drop characteristics of a compact heat exchanger with pin fins. A modular wind-tunnel with a rectangular cross-section duct-flow area was constructed that would accommodate the heat exchanger test section with varying pin designs. The flow in the tunnel was achieved through a suction-type blower, and a leading entrance length section was added to achie...

  5. Modeling and Simulation of Current Source Inverter Fed Synchronous Motor in Complex Frequency Domain Taking the Transition Zone From Induction Motor to Synchronous Motor Mode into Account

    OpenAIRE

    A.B. Chattopadhyay; Sunil Thomas

    2014-01-01

    Modeling of synchronous motor plays a dominant role in designing complicated drive system for different applications, especially large blower fans etc for steel industries. As synchronous motor has no inherent starting torque generally it is started as an induction motor with the help of a damper winding and it pulls into synchronism under certain conditions. The present paper exactly concentrates on this particular zone of transition from induction motor to synchronous motor mode for a curre...

  6. An Insight into the Time Domain Phenomenon during the Transition Zone from Induction Motor to Synchronous Motor Mode for a Current Source Inverter Fed Synchronous Motor Drive System

    OpenAIRE

    A.B. Chattopadhyay; Sunil Thomas

    2014-01-01

    Modeling of synchronous motor plays a dominant role in designing complicated drive system for different applications, especially large blower fans etc., for steel industries. As synchronous motor has no inherent starting torque generally it is started as an induction motor with the help of a damper winding and it pulls into synchronism under certain conditions. The present study exactly concentrates on this particular zone of transition from induction motor to synchronous motor mode for a cur...

  7. Analisis Perhitungan Panas Motor DC SHUNT Pada Saat Start Dan Pengereman ( Aplikasi pada Laboratorium Konversi Energi Listrik FT-USU ).

    OpenAIRE

    Ginting, Eka Dian Arjuna

    2011-01-01

    Motor adalah mesin yang mengubah energi listrik menjadi energi mekanis. Pada motor arus searah energi listrik arus searah diubah menjadi energi mekanis. Dalam dunia industri, motor arus searah banyak digunakan sebagai penggerak pompa air, blower, hoist pada crane. Dalam operasi suatu motor DC maka akan timbul rugi – rugi panas sehingga terjadi kenaikan suhu yang menyebabkan kerusakan isolasi pada motor DC tersebut. Pada motor DC rugi – rugi panas lebih besar terjadi pada kea...

  8. Vaporous Hydrogen Peroxide (VHP) Decontamination of a C-141B Starlifter Aircraft: Validation of VHP and Modified VHP (mVHP) Fumigation Decontamination Process via VHP-Sensor, Biological Indicator, and HD Simulant in a Large-Scale Environment

    Science.gov (United States)

    2007-03-01

    21 18. G. stearothermophilus ATCC 7953VHP Exposure Test Results ..................... 33 19. Vapor Cup ...provided forced air circulation. An anemometer , located downstream of the main blower, measured and recorded the airflow generated by the mVHP system...Station) Height (inches) 1 670 8 2 890 48 3 1230 72 3.4.2 Chemical Warfare Agent Simulant Vapor Analysis Vapor cups were prepared for residual chemical

  9. An Integrated model for Product Quality Development—A case study on Quality functions deployment and AHP based approach

    Science.gov (United States)

    Maitra, Subrata; Banerjee, Debamalya

    2010-10-01

    Present article is based on application of the product quality and improvement of design related with the nature of failure of machineries and plant operational problems of an industrial blower fan Company. The project aims at developing the product on the basis of standardized production parameters for selling its products in the market. Special attention is also being paid to the blower fans which have been ordered directly by the customer on the basis of installed capacity of air to be provided by the fan. Application of quality function deployment is primarily a customer oriented approach. Proposed model of QFD integrated with AHP to select and rank the decision criterions on the commercial and technical factors and the measurement of the decision parameters for selection of best product in the compettitive environment. The present AHP-QFD model justifies the selection of a blower fan with the help of the group of experts' opinion by pairwise comparison of the customer's and ergonomy based technical design requirements. The steps invoved in implementation of the QFD—AHP and selection of weighted criterion may be helpful for all similar purpose industries maintaining cost and utility for competitive product.

  10. Abstract of a report on reducing resistance in gas-fired preheaters

    Energy Technology Data Exchange (ETDEWEB)

    1939-04-27

    The demands of Hydro-works Scholven to increase the capacity of one of their preheaters, with consequently greater volume of circulating gases, inspired the idea to study the resistance to the flow of gases in the preheaters. The resistance varied with the square of the velocity, so that pressure differences beyond the capacity of the single-stage Schiele blowers could be easily developed. It was intended, therefore, to determine the exact course of the pressure loss in preheaters in operation at Scholven. Since this met with many practical difficulties, it was supplemented by measurements on sheet steel models built to one-tenth their actual size. The measurements on the preheaters already in service showed that the pressure loss in the heating chamber proper, that is the pressure losses applicable to heat transmission, were small compared to the total pressure loss. The greatest proportion of the heating loss occurred in the inlet and outlet ducts and passages. This indicated that particular attention must be paid to the resistance in the ducts and the distributing points. The gas distribution needed to be arranged such that energy-consuming dampers could be eliminated. Where bends could not be avoided, guide vanes could considerably reduce the pressure loss. It was suggested to use an Escher--Weiss axial blower system instead of the Schiele radial blower. Reduction of pressure losses would increase velocity of the gases in the heating flues and thus increase heat transmission in the hairpin coils.

  11. Temperature equilization in the Luetzkendorf preheater

    Energy Technology Data Exchange (ETDEWEB)

    1943-01-30

    Suggestions are offered for improvement to attain more nearly uniform temperature distribution in the preheater inlet and outlet as well as for improvement of a loss of pressure in heating gas for raising the efficiency of the heating gas blower. The evaluation of the operating conditions from the standpoint of the heating gas were made in the hydrogenation works of Poelitz, in 1939 with the preheater constructed on the Ludwigshafen plan, and in Luetzkendorf on the preheater of the Leuna model. Both preheaters had two Schiele heating gas blowers of the type 1160. Operating conditions involving hairpin tubes, temperatures, resistance, volume, piping, pressure, and heat conduction were given for both plants. A sketch for the heating gas movement was mentioned in the report but was not included. Recommendations on the use of a new blower were given. Some of these were reducing the yield to 90,000 cubic meters per hour and using the same motors. The distribution of the amounts and of the temperature drop of the gas and of the material of the hairpins were given.

  12. Dynamic Modeling of a Reformed Methanol Fuel Cell System using Empirical Data and Adaptive Neuro-Fuzzy Inference System Models

    DEFF Research Database (Denmark)

    Justesen, Kristian Kjær; Andreasen, Søren Juhl; Shaker, Hamid Reza

    2014-01-01

    In this work, a dynamic MATLAB Simulink model of a H3-350 Reformed Methanol Fuel Cell (RMFC) stand-alone battery charger produced by Serenergy is developed on the basis of theoretical and empirical methods. The advantage of RMFC systems is that they use liquid methanol as a fuel instead of gaseous...... of the reforming process are implemented. Models of the cooling flow of the blowers for the fuel cell and the burner which supplies process heat for the reformer are made. The two blowers have a common exhaust, which means that the two blowers influence each other’s output. The models take this into account using...... an empirical approach. Fin efficiency models for the cooling effect of the air are also developed using empirical methods. A fuel cell model is also implemented based on a standard model which is adapted to fit the measured performance of the H3-350 module. All the individual parts of the model are verified...

  13. Dynamic Modeling of a Reformed Methanol Fuel Cell System using Empirical Data and Adaptive Neuro-Fuzzy Inference System Models

    DEFF Research Database (Denmark)

    Justesen, Kristian Kjær; Andreasen, Søren Juhl; Shaker, Hamid Reza

    2013-01-01

    In this work, a dynamic MATLAB Simulink model of a H3-350 Reformed Methanol Fuel Cell (RMFC) stand-alone battery charger produced by Serenergy is developed on the basis of theoretical and empirical methods. The advantage of RMFC systems is that they use liquid methanol as a fuel instead of gaseous...... of the reforming process are implemented. Models of the cooling flow of the blowers for the fuel cell and the burner which supplies process heat for the reformer are made. The two blowers have a common exhaust, which means that the two blowers influence each other’s output. The models take this into account using...... an empirical approach. Fin efficiency models for the cooling effect of the air are also developed using empirical methods. A fuel cell model is also implemented based on a standard model which is adapted to fit the measured performance of the H3-350 module. All the individual parts of the model are verified...

  14. Nonlinear modeling of activated sludge process using the Hammerstein-Wiener structure

    Directory of Open Access Journals (Sweden)

    Frącz Paweł

    2016-01-01

    Full Text Available The paper regards to physical model of the Activated Sludge Process, which is a part of the wastewater treatment. The aim of the study was to describe nitrogen transformation process and the demand of chemical fractions, involved in the ASP process. Moreover, the non-linear relationship between the flow of wastewater and the consumed electrical energy, used by the blowers, was determined. Such analyses are important from the economical and environmental point of view. Assuming that the total power does not change the blower is charging during a year an energy amount of approx. 613 MW. This illustrates in particular the scale of the demand for energy consumption in the biological aeration unit. The aim is to minimize the energy consumption through first building a model of ASP and then through optimization of the overall process by modifying chosen parameter in numerical simulations. In this paper example measurement and analysis results of nitrite and ammonium nitrogen concentrations in the aeration reactor and the active power consumed by blowers for the aeration process were presented. Further the ASP modeling procedure, which uses the Hammerstein-Wiener structure and example verification results were presented. Based on the achieved results it was stated that the developed set of methodologies may be used to improve and expand the overriding control system for system for wastewater treatment plant.

  15. Pollution profiles and health risk assessment of VOCs emitted during e-waste dismantling processes associated with different dismantling methods.

    Science.gov (United States)

    An, Taicheng; Huang, Yong; Li, Guiying; He, Zhigui; Chen, Jiangyao; Zhang, Chaosheng

    2014-12-01

    Pollution profiles of typical volatile organic compounds (VOCs) emitted during dismantling of various printed circuit board assemblies (PCBAs) of e-wastes using different methods were comparatively investigated in the real e-waste dismantling workshops in South China in April 2013. Similar pollution profiles and concentrations of VOCs were observed between dismantling mobile phone and hard disk PCBAs by using electric blowers and between dismantling television and power supplier PCBAs using electric heating furnaces. Aromatic hydrocarbons (accounting for >60% of the sum of VOCs) were the dominant group during using electric blowers, while aromatic (accounting for >44% of the sum of VOCs) and halogenated hydrocarbons (accounting for >48% of the sum of VOCs) were the two dominant groups which contributed equally using electric heating furnaces. However, the distribution profiles of VOCs emitted during dismantling of televisions, hard disks and micro motors using rotary incinerators varied greatly, though aromatic hydrocarbons were still the dominant group. The combustion of e-wastes led to the most severe contamination of VOCs, with total VOCs (3.3×10(4) μg m(-3)) using rotary incinerators about 190, 180, 139, and 40 times higher than those using mechanical cutting, electric soldering iron, electric blower, and electric heating furnace, respectively. Both cancer and non-cancer risks existed for workers due to exposure to on-site emitted VOCs in all workshops especially in those using rotary incinerators according to the USEPA methodology, whereas only cancer risks existed in rotary incinerator workshops according to the American Conference of Industrial Hygienists methodology.

  16. Outcomes on the Spray Profiles Produced by the Feasible Adjustments of Commonly Used Sprayers in “Tendone” Vineyards of Apulia (Southern Italy

    Directory of Open Access Journals (Sweden)

    Simone Pascuzzi

    2016-12-01

    Full Text Available The objective of the research was to assess the outcomes on the spray patterns produced by the different feasible adjustments of two different air blast sprayers and one mist blower sprayer, commonly employed for treatments to Apulian “tendone” vineyards. The spray profiles of these machines and the respective refinements affected by the alteration of the available adjusting devices were evaluated using a test bench, suitably set up for calibrating the sprayers used inside such vines. The air blast sprayers, compared with the mist blower model, have a better chance to match the spray pattern and the canopy profile of the “tendone” vines. Furthermore, the left-right asymmetry of the spray profile is reduced only in the case of sprayers with two counter-rotating fans, under certain operating conditions. Conversely, the symmetry index worsens with the activation of the fan in the case of the air blast sprayer fitted with a single fan either with or without the air deflectors. The mist blower sprayer develops lower drawbacks, in terms of left-right asymmetry of the spray profile, even if the high “stiffness” of the spray profile makes this sprayer not particularly suitable to the changing needs of the canopy of the “tendone” vineyards. The obtained results, even if related to the analyzed sprayers, can represent an original base of reference to set up guidelines for the adjustment of sprayers used for treatments inside “tendone” vineyards, very useful for the officially authorized Apulian workshops to make sprayers inspection and calibration.

  17. Design and calibration of the mixing layer and wind tunnel

    Science.gov (United States)

    Bell, James H.; Mehta, Rabindra D.

    1989-01-01

    A detailed account of the design, assembly and calibration of a wind tunnel specifically designed for free-shear layer research is contained. The construction of this new facility was motivated by a strong interest in the study of plane mixing layers with varying initial and operating conditions. The Mixing Layer Wind tunnel is located in the Fluid Mechanics Laboratory at NASA Ames Research Center. The tunnel consists of two separate legs which are driven independently by centrifugal blowers connected to variable speed motors. The blower/motor combinations are sized such that one is smaller than the other, giving maximum flow speeds of about 20 and 40 m/s, respectively. The blower speeds can either be set manually or via the Microvax II computer. The two streams are allowed to merge in the test section at the sharp trailing edge of a slowly tapering splitter plate. The test section is 36 cm in the cross-stream direction, 91 cm in the spanwise direction and 366 cm in length. One test section side-wall is slotted for probe access and adjustable so that the streamwise pressure gradient may be controlled. The wind tunnel is also equipped with a computer controlled, three-dimensional traversing system which is used to investigate the flow fields with pressure and hot-wire instrumentation. The wind tunnel calibration results show that the mean flow in the test section is uniform to within plus or minus 0.25 pct and the flow angularity is less than 0.25 deg. The total streamwise free-stream turbulence intensity level is approximately 0.15 pct. Currently the wind tunnel is being used in experiments designed to study the three-dimensional structure of plane mixing layers and wakes.

  18. City of Camden, New Jersey Program offering widespread energy recovery (power): Final report

    Energy Technology Data Exchange (ETDEWEB)

    Witkowski, Stanley [City of Camden, NJ (United States). Dept. of Development and Planning Bureau of Housing Services

    2013-12-31

    The Camden Residential POWER Program, Program Offering Widespread Energy Recovery, is a program designed to benefit Camden homeowners, stabilize neighborhoods and put local contractors to work. Camden POWER granted up to $18,600 to fund energy efficient home improvements and necessary life/safety rehabilitation repairs. The program was designed as a self-sustaining, neighborhood approach to bringing long-term energy and financial savings to the community. Valuable home upgrades were completed, including high-efficiency furnaces, hot water heaters, insulation, insulated roofs and blower door guided air-sealing. The goal of all improvements were to reduce energy consumption, lower utility bills, improve property values and promote neighborhood stabilization.

  19. 60-WATT HYDRAZINE-AIR FUEL CELL SYSTEM.

    Science.gov (United States)

    fuel cell system as presented in our Design Plan. Prior to preparation of the Design Plan, a systems analysis of the basic electrochemical system was made. From the results of this analysis, the operating parameters of the support equipment were defined and an initial selection of components made. System components defined were: the cell stack, electrolyte tank, hydrazine feed system, cooling and chemical air blowers, voltage regulator, and thermal control system. A package design was then made for these components and the final detail design completed.

  20. Efficiency and reliability assessments of retrofitted high-efficiency motors

    Energy Technology Data Exchange (ETDEWEB)

    Hsu, John S.; Otaduy, P.J.; Dueck, J.D.

    1994-12-31

    The majority of electric-motor applications are pumps, fans, blowers, and certain compressors that follow the load torque pattern described in this paper. It has been known for many years that simply replacing the old motor with a high-efficiency motor might not produce the expected efficiency gain. This paper suggests the calculations for the effective efficiency and temperature rise of the high-efficiency motor. The reliability in terms of temperature rise, downsizing, power factor, harmonics, mechanical structure, etc., are discussed.

  1. Different Boosting Systems and their Control Strategies for a Spark Ignition Internal Combustion Engine

    Directory of Open Access Journals (Sweden)

    Bolehovský Ondřej

    2016-06-01

    Full Text Available This research uses 1-D simulation in GT-Power for evaluation of boosting systems for a spark ignition engine. Exhaust gas driven (waste-gated turbocharger and mechanical driven (Roots blower boosting systems are assessed in both steady state and transient modes in terms of performance, efficiency, fuel consumption, drivability, energy distribution and other aspects that influence gas exchange phase. Moreover, different boost control strategies, particularly at partial load, are also evaluated. Results of the research are aimed at helping identify an optimal boosting system for standardized or real-world drive cycles.

  2. The optimisation and analysis of a centrifugal slurry pump impeller with 2 blades

    Directory of Open Access Journals (Sweden)

    Mehmet Salih Cellek

    2013-08-01

    Full Text Available With FLUENT, which is Computational Fluid Dynamics (CFD software, it becomes possible to define the performance of complicated flow in turbo machines like pumps and blowers. It is not only reduced costs but also saves time. This study is aimed to optimize a commercial slurry pump impeller. Therefore, four different types of impellers were designed with using various blade angles, blade length and splitter blade on the impeller, which is the most crucial component of the pump. As a result of analysis it was seen that every impeller affected on the pump performance at different flow rate.

  3. IMPACT OF TEHNICAL SPRAYING FACTORS ON LEAF AREA COVERAGE IN PERMANENT CROPS

    Directory of Open Access Journals (Sweden)

    Vjekoslav Tadić

    2013-12-01

    Full Text Available Researches are conducted in vineyard and apple orchard with two different types of mist blowers, axial (Hardi Zaturn and radial (Hardi Arrow. The influence of major technical spraying factors (type of nozzle, working speed and spray volume were observed on coverage of the treated area, average droplet diameter, number of droplets per cm2 and drift. The working speed of sprayer was set at 6 and 8 km/h, and spray volume on 250, 325 and 400 l/ha for apple orchard and 250, 300 and 350 l/ha for vineyard. Researchers used Lechler blue (TR 8003, yellow (TR 8002 and green (TR 80015 nozzles. The research was set as three - factorial field experiment with 18 treatments in 4 repetitions, for different type of sprayer and permanent crops. We used 60 water sensitive papers for that treatment, which were processed with digital image analysis and ImageJ software. In addition to the main features of the research, research showed leaf area index and density, speed and flow of air current, working pressure, orientation of the nozzles and weather conditions, which were monitored during the study. Before the research, mist blowers are tested according to the European standard 13790. By decreasing the ISO number of nozzles and by increasing the working speed and spray volume, we found increase of area coverage, number of droplets per cm2and drift, and decrease of average droplet diameter. Also, by comparing the results of research exploitation by axial and radial mist blower in the vineyards and apple orchards, better results are achieved with radial mist blower (Hardi Arrow in both cases. The best relationship of area coverage and liquid drift in vineyard were achieved with 64.22% area coverage and 17.11% of liquid drift (green nozzle, working speed of 6 km/h, spray volume of 350 l/ha, and working pressure of 10.99 bar. In apple orchard the best relationship of area coverage and liquid drift were achieved with 59.55% area coverage and 21.10% of liquid drift (green

  4. Jet Inlet Efficiency

    Science.gov (United States)

    2013-08-08

    Release Film. • Mix and lay down plaster o Place desired amount of plaster mixture (Plaster of Paris) into a container or bucket . o Mix in the...an open square form) with clay tape and insert a lacerated hose for even suction over the fabric and mold. o Fold the other half of the sheet over...two. • Run test o Turn on the leaf blower to begin the suction through the duct. • Use o Test was only run once. o Watching the behavior of the

  5. Scientific Presentations on Superconductivity from 2002-2005

    Science.gov (United States)

    2006-01-01

    1,000 hp and above) commercial motor market for use in pumps, fans, compressors, blowers, and belt drives deployed by utility and industrial...3 cm Kaufman Ion Source ( COMMON WEALTH) • 2 Off-Axis Residual Gas Analyzers • Substrate heater ~ 1000 oC • 1x1 sq foot uniformity with double...Analyzers • Substrate heater ~ 1000 oC • 1x1 sq foot uniformity with double side reel to reel coating NEUTRALIZERS (2) TUNER 20cm RF ION

  6. Model-Scale Experiment of the Seakeeping Performance for R/V Melville, Model 5720

    Science.gov (United States)

    2012-07-01

    However, due to the many variables and non-linearities of the wave-making system, the blower RPM settings were verified prior to the test. Wave...as variance, are defined for an infinite data set. As a result, the calculation of such quantities on any real- world data set is only an estimate of...absolute units from Moose (1986) is 9.80100 0.00004 m/s 2 at the MASK. This value was computed from the National Oceanic and Atmospheric Administration

  7. Use of Activated Carbon to Control Volatilization of Organic Contaminants from the Indiana Harbor Confined Disposal Facility

    Science.gov (United States)

    2012-09-01

    leach . The other problem was associated with complete removal. At high PAC doses, all the dissolved phase contaminant was adsorbed (100% removal...Thibodeaux et al. (2008) described the wind tunnel operations as follows. An 11.2 W (15 hp) blower was used to draw outside air into the wind tunnel...0.5 in.) X 15.2 cm (6 in.) length was added to further straighten the flow. A stack of four wire screens were placed last to further assist in

  8. War casualties on the home front

    Energy Technology Data Exchange (ETDEWEB)

    Brenda J. Flinn

    2005-11-01

    On May 12, 1942, at Christopher coal mine No. 3 in Osage, West Virginia, a continent away from the frontlines of World War II, Superintendent Ed O'Neil saw the mine ventilation fan suddenly run backwards, propelled by a strong gust of air that tore the belt off the huge blower. The second shift mantrip of 115 coal miners, traversing the drift mouth for the 3:00 p.m. shift, ground to an uneasy halt. The article recounts the tragic consequences of this incident. It also tells of other events affecting coal miners during World War I and World War II.

  9. Investigation of air cleaning system response to accident conditions

    Energy Technology Data Exchange (ETDEWEB)

    Andrae, R.W.; Bolstad, J.W.; Foster, R.D.; Gregory, W.S.; Horak, H.L.; Idar, E.S.; Martin, R.A.; Ricketts, C.I.; Smith, P.R.; Tang, P.K.

    1980-01-01

    Air cleaning system response to the stress of accident conditions are being investigated. A program overview and hghlight recent results of our investigation are presented. The program includes both analytical and experimental investigations. Computer codes for predicting effects of tornados, explosions, fires, and material transport are described. The test facilities used to obtain supportive experimental data to define structural integrity and confinement effectiveness of ventilation system components are described. Examples of experimental results for code verification, blower response to tornado transients, and filter response to tornado and explosion transients are reported.

  10. Nuclear Regulatory Commission Issuances, Volume 42, No. 2

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-08-01

    This report include the issuances received during the specificed period (August 1995) from the NRC, the Atomic Safety and Licensing Boards, the Administrative Law Judges, and the Decisions on Petitions for Rule Making. In these issuances, the following areas were addressed: (1) Emergency planning at the University of Missouri, (2) Transfer of operating license at Plant Vogtle, (3) Discriminatory action against a whistle-blower at Millstone Units 1 & 2, (4) Regulatory issues related to embittlement and cracking at Oyster Creek, and (5) Age-related deterioration of reactor internals components at Pilgrim.

  11. Calculation of cooling internal circuits loss of load curve in giant electric machines; Calculo da curva de perda de carga dos circuitos axiais internos de refrigeracao de maquinas eletricas gigantes

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Hilton Penha [Parana Univ., Curitiba, PR (Brazil). Dept. de Engenharia Mecanica. Dept. de Engenharia do Produto; Passos, Alex Sandro Barbosa [Parana Univ., Curitiba, PR (Brazil). Dept. de Engenharia Mecanica. Dept. de Pesquisa e Desenvolvimento do Produto

    2001-07-01

    This article describes a method for calculation of the loss of load curve for the ventilation axial circuits. The method assumes the ventilation circuit representation in a way similar to the electrical circuits. The great difficulty of circuit solution resides in the non linearity of the loss of load resistances and the equations relating the pressures and flows. The method is based on the association of the resistance curves of loss of load in a such way that, when the resistance curve of the total circuit loss of load is obtained, the blower operation point can be easily obtained and, consequently, the individual flows for each section of the circuit.

  12. Optimization of spray drying conditions for production of quality pomegranate juice powder

    OpenAIRE

    Khalid Muzaffar; Bijamwar Vilas Dinkarrao; Pradyuman Kumar

    2016-01-01

    The present study was aimed to optimize the spray drying operating parameters for the production of quality pomegranate juice powder using response surface methodology. The spray drying operating conditions including inlet air temperature (170–190°C), feed flow rate (18–30 mL/min), and blower speed varied (2,000–2,400 rpm) were used as independent variables. The responses evaluated were ascorbic acid content, anthocyanin content, moisture content, hygroscopicity, and water solubility index. S...

  13. Inward Leakage in Tight-Fitting PAPRs

    Directory of Open Access Journals (Sweden)

    Frank C. Koh

    2011-01-01

    Full Text Available A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs, the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.

  14. Atlas风机防喘振辅助设计及应用%Design and Application of Surge-Proof for Atlas Fan Auxiliary Equipment

    Institute of Scientific and Technical Information of China (English)

    崔银峰

    2012-01-01

    This paper mainly introduces the Atlas fan control circuit and analyzes the surging causes of fan. The design schemes optimizes surge-proof control and implementation for Ausmelt blowing technology on Atlas air blower.%本文主要介绍了Atlas风机的控制回路,并对风机喘振原因进行了分析.阐述了Ausmelt吹炼工艺中Atlas风机的防喘振优化设计方案与实施.

  15. AG Turbo-TurboTech II, project group 1.200: Improvement of flow stability and availability, noise reduction. Sub-project 1.245: Experimental investigation of rotary instabilities. Final report; AG Turbo-Turbotech II, Vorhabengruppe 1.200: Verbesserung von Stroemungsstabilitaet und Betriebssicherheit, Laermreduktion. Teilvorhaben 1.245: Experimentelle Untersuchung rotierender Instabilitaeten. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Neise, W.; Maerz, J.; Neuhaus, L.

    2000-12-01

    Blowers have a radial gap between the rotor tips and casing. Owing to the pressure difference between the suction and pressure side of a blower, flow aground the blade tips in the gap is caused. In case of wide gaps, this gap flow will affect the aerodynamic and acoustic performance. Noise is caused by an interaction between a rotary instability in the blower and the blades of the blower rotor. Although flow visualization did not provide further insight into the transient processes, the flow conditions on the blades of the rotor could be characterized. As expected in view of the low Reynolds numbers, long laminar flow was found on the blades in the transcritical region as well as the track of roll-up of the leakage vortex on the suction side. In order to investigate the source mechanism of the rotary instability, its azimuthal mode structure was measured in different points of the characteristic and with different numbers of blades. The azimuthal modes were calculated from the wall pressure variations measured across the circumference according to a method described by Holste. [German] Ventilatoren haben zwischen den Schaufelspitzen des Laufrades und dem Gehaeuse einen radialen Spalt. Wegen der Druckdifferenz zwischen Saug- und Druckseite des Ventilators kommt es zu einer Ueberstroemung der Schaufelspitzen im Spalt. Bei grossen Spaltweiten fuehrt diese Spaltstroemung zu einer Verschlechterung des aerodynamischen und des akustischen Verhaltens. Es entsteht ein Spaltgeraeusch, auch Blattspitzen-Wirbellaerm genannt. Als Quellmechanismus des Spaltgeraeusches wurde von Kameier, Nawrot, Neise, Kameier und Kameier, Neise, eine Wechselwirkung zwischen einer rotierenden Instabilitaet im Ventilator und den Schaufeln des Ventilatorlaufrades festgestellt. Durch Stroemungsvisualisierung konnte zwar kein weiterer Aufschluss ueber das instationaere Verhalten gewonnen werden, dennoch lassen sich mit der verwendeten Methode die Stroemungsverhaeltnisse auf den Schaufeln des

  16. Multifamily Envelope Leakage Model

    Energy Technology Data Exchange (ETDEWEB)

    Faakye, O. [Consortium for Advanced Residential Buildings, Norwalk, CT (United States); Griffiths, D. [Consortium for Advanced Residential Buildings, Norwalk, CT (United States)

    2015-05-01

    The objective of the 2013 research project was to develop the model for predicting fully guarded test results (FGT), using unguarded test data and specific building features of apartment units. The model developed has a coefficient of determination R2 value of 0.53 with a root mean square error (RMSE) of 0.13. Both statistical metrics indicate that the model is relatively strong. When tested against data that was not included in the development of the model, prediction accuracy was within 19%, which is reasonable given that seasonal differences in blower door measurements can vary by as much as 25%.

  17. Boilers a practical reference

    CERN Document Server

    Rayaprolu, Kumar

    2012-01-01

    AAbrasion and Abrasion Index (see Wear)Absolute or Dynamic Viscosity (æ) (see Viscosity in Fluid Characteristics)Acid Cleaning (see Commissioning)Acid Rain (also see Air Pollution Emissions and Controls and Gas Cleaning)Acid Sludge (see Refuse Fuels from Refinery in Liquid Fuels)Acid Smuts (see Oil Ash)Acoustic Soot Blowers (see Sonic Horns)Acoustic Enclosure (see Noise Control)Acoustic Leak Detection SystemAdiabatic Flame Temperature (see Combustion)Aeroderivative (see Types of GTs in Turbines, Gas)Ageing of Boiler ComponentsAgro-Fuels and FiringAir Ducts (see Draught Plant)Air Flow Measureme

  18. 纸机真空系统节能探讨兼谈芬兰兰泰克Ecopump变速透平机

    Institute of Scientific and Technical Information of China (English)

    张道沛

    2016-01-01

    通过与制浆造纸行业现有的水环泵和单/多级透平机两种真空系统进行比较,分析了芬兰Ecopump变速透平机真空系统技术及其节能优势所在。Ecopump变速透平机可为纸机真空系统节能30%~70%,同时具有投资回报快、安装维护快且简单等特点。%Through the comparison with traditional water ring pump and single/multi-stage turbo blower vacuum systems in pulp and paper industry, a revolutionary energy saving Ecopump turbo vacuum system from Finland was introduced. By the way of demonstration of technical principles and successful references, Ecopump turbo blower can save energy consumption of 30% to 70% for paper machine vacuum system. At the same time, it has other advantages such as fast payback time, fast and easy installation and maintenance, etc.

  19. Analysis of Two Stroke Marine Diesel Engine Operation Including Turbocharger Cut-Out by Using a Zero-Dimensional Model

    Directory of Open Access Journals (Sweden)

    Cong Guan

    2015-06-01

    Full Text Available In this article, the operation of a large two-stroke marine diesel engine including various cases with turbocharger cut-out was thoroughly investigated by using a modular zero-dimensional engine model built in MATLAB/Simulink environment. The model was developed by using as a basis an in-house modular mean value engine model, in which the existing cylinder block was replaced by a more detailed one that is capable of representing the scavenging ports-cylinder-exhaust valve processes. Simulation of the engine operation at steady state conditions was performed and the derived engine performance parameters were compared with the respective values obtained by the engine shop trials. The investigation of engine operation under turbocharger cut-out conditions in the region from 10% to 50% load was carried out and the influence of turbocharger cut-out on engine performance including the in-cylinder parameters was comprehensively studied. The recommended schedule for the combination of the turbocharger cut-out and blower activation was discussed for the engine operation under part load conditions. Finally, the influence of engine operating strategies on the annual fuel savings, CO2 emissions reduction and blower operating hours for a Panamax container ship operating at slow steaming conditions is presented and discussed.

  20. Development of the instrumentation and modeling for heat transfer characteristics in CFBC. Technical progress report No. 2, April 1, 1996--September 30, 1996

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Seong W.

    1996-11-01

    This technical report summarizes the research conducted and progress achieved during the period of April 1, 1996 to September 30, 1996. Auxiliary subsystems tests of the circulating fluidized bed were conducted and included the characteristics of a regenerative blower, a gas distributor, and a cyclone. When the air flow rate increases, the pressure at the blower outlet is decreased. The air flow rate in the riser is a function of the pressure in the wind box. The cyclone pressure drop and gas distributor pressure drop are functions of the primary air flow rate input. The higher gas pressure drop indicates primary air in the riser column with a uniform superficial velocity. The CFB primary test was conducted using glass beads as one of the CFB bed materials. Three typical tests with different sizes of glass were conducted. The pressure sensor data acquisition system was developed for the systematic instrumentation of flow measurements in the CFB system. Two types of sensors were used, a single pressure sensor, and a differential pressure sensor, respectively. The software used to control the analog/digital board was Paragon 500. The CFB experimental studies for hydrodynamics will be continued with the improved data acquisition system.

  1. Computer code simulations of explosions in flow networks and comparison with experiments

    Science.gov (United States)

    Gregory, W. S.; Nichols, B. D.; Moore, J. A.; Smith, P. R.; Steinke, R. G.; Idzorek, R. D.

    1987-10-01

    A program of experimental testing and computer code development for predicting the effects of explosions in air-cleaning systems is being carried out for the Department of Energy. This work is a combined effort by the Los Alamos National Laboratory and New Mexico State University (NMSU). Los Alamos has the lead responsibility in the project and develops the computer codes; NMSU performs the experimental testing. The emphasis in the program is on obtaining experimental data to verify the analytical work. The primary benefit of this work will be the development of a verified computer code that safety analysts can use to analyze the effects of hypothetical explosions in nuclear plant air cleaning systems. The experimental data show the combined effects of explosions in air-cleaning systems that contain all of the important air-cleaning elements (blowers, dampers, filters, ductwork, and cells). A small experimental set-up consisting of multiple rooms, ductwork, a damper, a filter, and a blower was constructed. Explosions were simulated with a shock tube, hydrogen/air-filled gas balloons, and blasting caps. Analytical predictions were made using the EVENT84 and NF85 computer codes. The EVENT84 code predictions were in good agreement with the effects of the hydrogen/air explosions, but they did not model the blasting cap explosions adequately. NF85 predicted shock entrance to and within the experimental set-up very well. The NF85 code was not used to model the hydrogen/air or blasting cap explosions.

  2. Flow and Heat Transfer Tests in New Loop at 2757 kPa (400 psi)

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-06-13

    A helium flow and heat transfer experiment has been designed for the new helium flow loop facility at LANL. This new facility is centered on an Aerzen GM 12.4 Root’s blower, selected for operation at higher pressure, up to 2757 kPa, and mass flow rate, up to 400 g/s. This replaces the previous Tuthill PD plus 3206 blower and loop limited to 2067 kPa (300 psi) and 100 g/s. The resistively heated test piece is comprised of 7 electric heaters with embedded thermocouples. The plant design for the Mo100 to Mo99 targets requires sharp bends and geometry changes in the helium flow tube immediately before and after the target. An idealized fully developed flow configuration with straight entry and exit will be tested and compared with an option that employs rectangular tubing to make the bend at a radius consistent with and practical for the actual plant design. The current plant design, with circular tubing and a sudden contraction to rectangular just prior to target entrance, will also be tested. This requires some modification of the test piece, as described in the report.

  3. Improving operability of spouted beds using a simple optimizing control structure

    Directory of Open Access Journals (Sweden)

    N. A. CORRÊA

    1999-12-01

    Full Text Available In operations using spouted beds, it is of major importance, from an energy consumption point of view, to operate the process as close as possible to the minimum spout flow. At this point, the speed of the gas (for example, warm air in drying operations is greater than the amount of heat and mass transfer involved, although it only transfers the minimum amount of momentum to maintain the spout. Therefore, by staying close to this minimum flow condition, it is possible to perform a stable operation and to obtain energy savings not only in the heating of the gas but also in its displacement by blowers. In order to improve the operation of such processes, a study is carried out by implementing a simple optimizing control structure on a spouted bed experimental set-up. The air flow is regulated by a frequency inverter, at the speed of blower rotation. A PI controller was used and the set-point for the air flow rate is calculated on-line by a simple and well-known minimization method called Golden Section Search. This set-point is constantly updated with values very close to the actual minimum spout flow rate. To accomplish the calculations and data acquisitions, a microcomputer with an interface and an analog signal conditioner is used .

  4. Whistleblowing in the Slovak labor law regulation

    Directory of Open Access Journals (Sweden)

    Daniel Krošlák

    2015-12-01

    Full Text Available Corrupt behaviour is a common practice with negative effects on the whole of society. For instance, if a company wins a public procurement contract in an unfair way, it enriches itself not only at the expense of competition, but also at the expense of the whole of society, as the best applicant has not necessarily been selected within such a procurement. The same applies in the case of a supplier launching an unsafe product onto the market, threatening the health of everyone who buys it. In order to prevent such malpractice and eliminate their negative effects, the cooperation of persons aware of such behaviours is necessary. In order to ensure such cooperation, however, the existence of instruments protecting whistle-blowers against various sanctions (especially by employers is necessary. As Slovak legislation did not include a regulation of procedures for reporting malpractice and protecting whistle-blowers, a new law aimed at solving such issues was enacted in October, 2014. The given legal regulation took effect on January 1, 2015. This paper endeavours to provide basic knowledge of the environment that the given regulation entered, as well as information on the possibilities of individuals to protect social interests on its grounds.

  5. Nickel super alloy INCONEL 713LC - structural characteristics after heat treatment

    Directory of Open Access Journals (Sweden)

    A. Hernas

    2007-06-01

    Full Text Available Purpose: Nickel super alloy’s products are mainly using for construction parts of jet engines, gas turbines and turbo-blowers.Design/methodology/approach: Super alloy was commercially produced and was investigated by using the light microscopy (OLYMPUS IX 71 and local chemical microanalysis and by the scanning electron microscopy (JEOL JSM 50AFindings: We found a mode of optimum heat treatment. On the basis of obtained results it is possible to recommend a following regime of heat treatment: heating and dwell at the temperature exceeding 1240 °C (min. 1260 °C, so that precipitates at the grain boundaries dissolve completely, with subsequent slow cooling down to the temperature of approx. 940-950 °C, so that there occurs intensive intra-granular precipitation of intermetallic phase γ’.Research limitations/implications: The experiment was limited by occurrence a void in cast alloys.Practical implications: Nickel super alloy’s products are mainly using for construction parts of jet engines, gas turbines and turbo-blowers.Originality/value: Mode of optimum heat treatment was proposed. On the basis of obtained results it is possible to recommend the most suitable heat treatment, which produce intensive intra-granular precipitation of inter-metallic phase γ’. It was received a new know-how in this field.

  6. Slag monitoring system for combustion chambers of steam boilers

    Energy Technology Data Exchange (ETDEWEB)

    Taler, J.; Taler, D. [Cracow University of Technology, Krakow (Poland)

    2009-07-01

    The computer-based boiler performance system presented in this article has been developed to provide a direct and quantitative assessment of furnace and convective surface cleanliness. Temperature, pressure, and flow measurements and gas analysis data are used to perform heat transfer analysis in the boiler furnace and evaporator. Power boiler efficiency is calculated using an indirect method. The on-line calculation of the exit flue gas temperature in a combustion chamber allows for an on-line heat flow rate determination, which is transferred to the boiler evaporator. Based on the energy balance for the boiler evaporator, the superheated steam mass flow rate is calculated taking into the account water flow rate in attemperators. Comparing the calculated and the measured superheated steam mass flow rate, the effectiveness of the combustion chamber water walls is determined in an on-line mode. Soot-blower sequencing can be optimized based on actual cleaning requirements rather than on fixed time cycles contributing to lowering of the medium usage in soot blowers and increasing of the water-wall lifetime.

  7. Stable operation of air-blowing direct methanol fuel cells with high performance

    Science.gov (United States)

    Park, Jun-Young; Lee, Jin-Hwa; Kim, Jirae; Han, Sangil; Song, Inseob

    A membrane electrode assembly (MEA) that is a combination of a catalyst-coated membrane (CCM) for the anode and a catalyst-coated substrate (CCS) for the cathode is studied under air-blower conditions for direct methanol fuel cells (DMFCs). Compared with MEAs prepared by only the CCS method, the performance of DMFC MEAs employing the combination method is significantly improved by 30% with less methanol crossover. This feature can be attributed to an enhanced electrode|membrane interface in the anode side and significantly higher catalyst efficiency. Furthermore, DMFC MEAs designed by the combination method retain high power density without any degradation, while the CCM-type cell shows a downward tendency in electrochemical performance under air-blower conditions. This may be due to MEAs with CCM have a much more difficult structure of catalytic active sites in the cathode to eliminate the water produced by electrochemical reaction. In addition, DMFCs produced via combination methods exhibit a lower water crossover flux than CCS alternatives, due to the comparatively dense structure of the CCM anode. Hence, DMFCs with a combination MEA structure demonstrate the feasibility of a small fuel cell system employing the low noise of a fan, instead of a noisy and large capacity air pump, for portable electronic devices.

  8. Sky dancer: an intermittent system

    Science.gov (United States)

    Cros, Anne; Rodríguez Romero, Jesse Alexander; Damián Díaz Andrade, Oscar

    2009-11-01

    Sky dancers attract people sight to make advertising. What is the origin of those large vertical tubes fluctuations above an air blower? This study complements the previous one [1] about the system analysis from a dynamical system point of view. As a difference from the ``garden hose-instability'' [2], the tube shape has got ``break points''. Those ``break points'' separate the air-filled bottom tube portion from its deflated top portion. We record the tube dynamics with a high-speed videocamera simultaneously that we measure the pressure at the air blower exit. The intermittent pressure evolution displays picks when the tube fluctuates. We compare those overpressure values with the ones that appears in a rigid tube whose exit is partially obstructed. [1] F. Castillo Flores & A. Cros ``Transition to chaos of a vertical collapsible tube conveying air flow'' J. Phys.: Conf. Ser. 166, 012017 (2009). [2] A. S. Greenwald & J. Dungundji ``Static and dynamic instabilities of a propellant line'' MIT Aeroelastic and Structures Research Lab, AFOSR Sci. Report: AFOSR 67-1395 (1967).

  9. Predicting Envelope Leakage in Attached Dwellings

    Energy Technology Data Exchange (ETDEWEB)

    Faakye, O.; Arena, L.; Griffiths, D.

    2013-07-01

    The most common method for measuring air leakage is to use a single blower door to pressurize and/or depressurize the test unit. In detached housing, the test unit is the entire home and the single blower door measures air leakage to the outside. In attached housing, this 'single unit', 'total', or 'solo' test method measures both the air leakage between adjacent units through common surfaces as well air leakage to the outside. Measuring and minimizing this total leakage is recommended to avoid indoor air quality issues between units, reduce energy losses to the outside, reduce pressure differentials between units, and control stack effect. However, two significant limitations of the total leakage measurement in attached housing are: for retrofit work, if total leakage is assumed to be all to the outside, the energy benefits of air sealing can be significantly over predicted; for new construction, the total leakage values may result in failing to meet an energy-based house tightness program criterion. The scope of this research is to investigate an approach for developing a viable simplified algorithm that can be used by contractors to assess energy efficiency program qualification and/or compliance based upon solo test results.

  10. Opportunities for Open Automated Demand Response in Wastewater Treatment Facilities in California - Phase II Report. San Luis Rey Wastewater Treatment Plant Case Study

    Energy Technology Data Exchange (ETDEWEB)

    Thompson, Lisa; Lekov, Alex; McKane, Aimee; Piette, Mary Ann

    2010-08-20

    This case study enhances the understanding of open automated demand response opportunities in municipal wastewater treatment facilities. The report summarizes the findings of a 100 day submetering project at the San Luis Rey Wastewater Treatment Plant, a municipal wastewater treatment facility in Oceanside, California. The report reveals that key energy-intensive equipment such as pumps and centrifuges can be targeted for large load reductions. Demand response tests on the effluent pumps resulted a 300 kW load reduction and tests on centrifuges resulted in a 40 kW load reduction. Although tests on the facility?s blowers resulted in peak period load reductions of 78 kW sharp, short-lived increases in the turbidity of the wastewater effluent were experienced within 24 hours of the test. The results of these tests, which were conducted on blowers without variable speed drive capability, would not be acceptable and warrant further study. This study finds that wastewater treatment facilities have significant open automated demand response potential. However, limiting factors to implementing demand response are the reaction of effluent turbidity to reduced aeration load, along with the cogeneration capabilities of municipal facilities, including existing power purchase agreements and utility receptiveness to purchasing electricity from cogeneration facilities.

  11. Optimization of spray drying conditions for production of quality pomegranate juice powder

    Directory of Open Access Journals (Sweden)

    Khalid Muzaffar

    2016-12-01

    Full Text Available The present study was aimed to optimize the spray drying operating parameters for the production of quality pomegranate juice powder using response surface methodology. The spray drying operating conditions including inlet air temperature (170–190°C, feed flow rate (18–30 mL/min, and blower speed varied (2,000–2,400 rpm were used as independent variables. The responses evaluated were ascorbic acid content, anthocyanin content, moisture content, hygroscopicity, and water solubility index. Statistical analysis showed that among the independent variables, inlet air temperature showed greater effect on all the investigated responses. The derived optimum conditions were used for the powder production to check the validity of the quadratic model. Small deviations were observed between the experimental values and the predicted ones and the values were within the acceptable limits. The results showed that the optimum spray drying operating conditions for the production of pomegranate juice powder with optimum quality were 171°C inlet temperature, 30 mL/min feed flow rate, and 2,400 rpm blower speed. Under these optimum conditions, quality pomegranate juice powder with desirable properties of high content of vitamin C and anthocyanin, low moisture content, low hygroscopicity, and high solubility could be produced.

  12. Final Technical Report. Training in Building Audit Technologies

    Energy Technology Data Exchange (ETDEWEB)

    Brosemer, Kathleen [Sault Sainte Marie Tribe of Chippewa Indians, Marie, MI (United States)

    2015-03-27

    In 2011, the Tribe proposed and was awarded the Training in Building Audit Technologies grant from the DOE in the amount of $55,748 to contract for training programs for infrared cameras, blower door technology applications and building systems. The coursework consisted of; Infrared Camera Training: Level I - Thermal Imaging for Energy Audits; Blower Door Analysis and Building-As-A-System Training, Building Performance Institute (BPI) Building Analyst; Building Envelope Training, Building Performance Institute (BPI) Envelope Professional; and Audit/JobFLEX Tablet Software. Competitive procurement of the training contractor resulted in lower costs, allowing the Tribe to request and receive DOE approval to additionally purchase energy audit equipment and contract for residential energy audits of 25 low-income Tribal Housing units. Sault Tribe personnel received field training to supplement the classroom instruction on proper use of the energy audit equipment. Field experience was provided through the second DOE energy audits grant, allowing Sault Tribe personnel to join the contractor, Building Science Academy, in conducting 25 residential energy audits of low-income Tribal Housing units.

  13. NaOCl effect on biofilm produced by Staphylococcus aureus isolated from the milking environment and mastitis infected cows

    Directory of Open Access Journals (Sweden)

    Poliana de Castro Melo

    2014-02-01

    Full Text Available Biofilms constitute a physical barrier, protecting the encased bacteria from detergents and sanitizers. The objective of this work was to analyze the effectiveness of sodium hypochlorite (NaOCl against strains of Staphylococcus aureus isolated from raw milk of cows with subclinical mastitis and Staphylococcus aureus isolated from the milking environment (blowers and milk conducting tubes. The results revealed that, in the presence of NaOCl (150ppm, the number of adhered cells of the twelve S. aureus strains was significantly reduced. When the same strains were evaluated in biofilm condition, different results were obtained. It was found that, after a contact period of five minutes with NaOCl (150ppm, four strains (two strains from milk , one from the blowers and one from a conductive rubber were still able to grow. Although with the increasing contact time between the bacteria and the NaOCl (150ppm, no growth was detected for any of the strains. Concerning the efficiency of NaOCl on total biofilm biomass formation by each S. aureus strain, a decrease was observed when these strains were in contact with 150 ppm NaOCl for a total period of 10 minutes. This study highlights the importance of a correct sanitation protocol of all the milk processing units which can indeed significantly reduce the presence of microorganisms, leading to a decrease of cow´s mastitis and milk contamination.

  14. Hydraulic design of a low-specific speed Francis runner for a hydraulic cooling tower

    Science.gov (United States)

    Ruan, H.; Luo, X. Q.; Liao, W. L.; Zhao, Y. P.

    2012-11-01

    The air blower in a cooling tower is normally driven by an electromotor, and the electric energy consumed by the electromotor is tremendous. The remaining energy at the outlet of the cooling cycle is considerable. This energy can be utilized to drive a hydraulic turbine and consequently to rotate the air blower. The purpose of this project is to recycle energy, lower energy consumption and reduce pollutant discharge. Firstly, a two-order polynomial is proposed to describe the blade setting angle distribution law along the meridional streamline in the streamline equation. The runner is designed by the point-to-point integration method with a specific blade setting angle distribution. Three different ultra-low-specificspeed Francis runners with different wrap angles are obtained in this method. Secondly, based on CFD numerical simulations, the effects of blade setting angle distribution on pressure coefficient distribution and relative efficiency have been analyzed. Finally, blade angles of inlet and outlet and control coefficients of blade setting angle distribution law are optimal variables, efficiency and minimum pressure are objective functions, adopting NSGA-II algorithm, a multi-objective optimization for ultra-low-specific speed Francis runner is carried out. The obtained results show that the optimal runner has higher efficiency and better cavitation performance.

  15. Medium and high energy electron beam processing system

    Energy Technology Data Exchange (ETDEWEB)

    Kashiwagi, Masayuki [Nissin-High Voltage Co., Ltd., Kyoto (Japan)

    2003-02-01

    Electron Beam Processing System (EPS) is a useful and powerful tool for industrial irradiation process. The specification of EPS is decided by consideration to irradiate what material with how thick and wide, how much dose, how to handle, in what atmosphere. In designing an EPS, it is necessary to consider safety measure such as x-ray shielding, ozone control and interlock system. The initial costs to install typical EPS are estimated for acceleration voltages from 500 kV to 5 MV, including following items; those are electron beam machine, x-ray shielding, auxiliary equipment, material handling, survey for installation, ozone exhaust duct, cooling water system, wiring and piping. These prices are reference only because the price should be changed for each case. The price of x-ray shielding should be changed by construction cost. Auxiliary equipment includes window, cooling blower, ozone exhaust blower and SF6 gas handling equipment. In installation work at site, actual workers of 3 - 4 persons for 2 months are necessary. Material handling system is considered only rolls provided in the shielding room as reference. In addition to the initial installation, operators and workers may be required to wear a personal radiation monitor. An x-ray monitor of suitable design should be installed outside the shield room to monitor x-ray level in the working area. (Y. Tanaka)

  16. Development of a model for activated sludge aeration systems: linking air supply, distribution, and demand.

    Science.gov (United States)

    Schraa, Oliver; Rieger, Leiv; Alex, Jens

    2017-02-01

    During the design of a water resource recovery facility, it is becoming industry practice to use simulation software to assist with process design. Aeration is one of the key components of the activated sludge process, and is one of the most important aspects of modelling wastewater treatment systems. However, aeration systems are typically not modelled in detail in most wastewater treatment process modelling studies. A comprehensive dynamic aeration system model has been developed that captures both air supply and demand. The model includes sub-models for blowers, pipes, fittings, and valves. An extended diffuser model predicts both oxygen transfer efficiency within an aeration basin and pressure drop across the diffusers. The aeration system model allows engineers to analyse aeration systems as a whole to determine biological air requirements, blower performance, air distribution, control valve impacts, controller design and tuning, and energy costs. This enables engineers to trouble-shoot the entire aeration system including process, equipment and controls. It also allows much more realistic design of these highly complex systems.

  17. AN ELECTROMAGNETIC PNEUMO CAPSULE SYSTEM FOR CONVEYING MINERALS AND MINE WASTES

    Energy Technology Data Exchange (ETDEWEB)

    Henry Liu; Charles W. Lenau

    2005-03-01

    The purpose of this project is to investigate the technical and economic feasibility of using a new and advanced pneumatic capsule pipeline (PCP) system for transporting minerals and mine wastes. The new system is different from conventional PCPs in two main respects: (1) it uses linear induction motors (LIMs) instead of blowers (fans) at the inlet of the pipeline to drive (pump) the capsules and the air through the pipeline; and (2) the capsules in the PCP have steel wheels running on steel rails as opposed to capsules in conventional systems, which use wheels with rubber tires running inside a pipe without rail. The advantage of using LIM pump instead of blower is that the former is non-intrusive and hence does not block the passage of capsules, enabling the system to run continuously without having to make the capsules bypass the pump. This not only simplifies the system but also enables the system to achieve much larger cargo throughput than that of PCPs using blowers, and use of LIMs as booster pumps which enables the system to have any length or to be used for transporting cargoes over practically any distance, say even one thousand kilometers or miles. An advantage of using steel wheels rolling on steel rails instead of using rubber tires rolling inside a pipeline is that the rolling friction coefficient and hence the use of energy is greatly reduced from that of conventional PCP systems. Moreover, rails enable easy control of capsule motion, such as switching capsules to a branch line by using railroad switching equipment. The advanced PCP system studied under this project uses rectangular conduits instead of circular pipe, having cross-sectional areas of 1 m by 1 m approximately. The system can be used for various transportation distances, and it can transport up to 50 million tonnes (metric tons) of cargo annually--the throughput of the largest mines in the world. Both an aboveground and an underground system were investigated and compared. The technical

  18. [Emission of microorganisms from sewage treatment plants depending upon construction differences of single structural parts].

    Science.gov (United States)

    Eikmann, T; Schröder, S; Pieler, J; Bahr, H; Einbrodt, H J

    1986-04-01

    In order to examine the influence exerted by the differing design of individual water treatment plant units on the emission rate of micro-organisms and the associated degree of exposure to which plant personnel is subjected, measurements were taken at three different types of treatment plants. Measurements were made using "Biotest" RCS Air Samplers. The total count of colonies was determined by means of Agar Strips GK-A (tryptic soy agar). Enterobacteriaceae were quantitatively ascertained using Agar Strips C (MacConkey agar), particular attention being paid to the determination of the coliform bacteria as faeces indicators. Agar Strips S (mannitol salt agar) were used to measure the count of staphylococci using Agar Strips HS (rosa Bengal streptomycin agar). Before taking measurements, the prevailing climatic conditions were recorded. It could be ascertained that the enclosure of the inflow area (screw conveyor pump station and aerated grit removal tank) lead to a considerable increase in the concentration of microorganisms in the air within the housing. The values dropped however, when adequate ventilation was provided. Differing oxygen in the activated sludge tanks - finebubble aeration at the tank bottom or the blowing in of air via centrifugal blowers - lead to large variations in the emission rates. However, the less the waste water is agitated, the lower the emission rates. In the case of fine-bubble aeration, rates which are also normally to be found in the "non-burdened" outside air were even recorded close to the aeration tank. In cases of centrifugal blower, the aeration tank should be covered with a shield. With this type of aeration the waste water is emitted radially towards the walls of the tank. The use of a sprinkler unit on an aeration tank equipped with centrifugal blower - to avoid foam formation on the surface of the water - does not lead to an increase in the already high emission rate. An increase in air pollution through mould fungi from

  19. Exergetic performance evaluation and parametric studies of solar air heater

    Energy Technology Data Exchange (ETDEWEB)

    Gupta, M.K.; Kaushik, S.C. [Centre for Energy Studies, Indian Institute of Technology, Delhi 110016 (India)

    2008-11-15

    The present study aims to establish the optimal performance parameters for the maximum exergy delivery during the collection of solar energy in a flat-plate solar air heater. The procedure to determine optimum aspect ratio (length to width ratio of the absorber plate) and optimum duct depth (the distance between the absorber and the bottom plates) for maximum exergy delivery has been developed. It is known that heat energy gain and blower work increase monotonically with mass flow rate, while the temperature of air decreases; therefore, it is desirable to incorporate the quality of heat energy collected and the blower work. First it is proved analytically that the optimum exergy output, neglecting blower work, and the corresponding mass flow rate depend on the inlet temperature of air. The energy and exergy output rates of the solar air heater were evaluated for various values of collector aspect ratio (AR) of the collector, mass flow rate per unit area of the collector plate (G) and solar air heater duct depth (H). Results have been presented to discuss the effects of G, AR and H on the energy and exergy output rates of the solar air heater. The energy output rate increases with G and AR, and decreases with H and the inlet temperature of air. The exergy-based evaluation criterion shows that performance is not a monotonically increasing function of G and AR, and a decreasing function of H and inlet temperature of air. Based on the exergy output rate, it is found that there must be an optimum inlet temperature of air and a corresponding optimum G for any value of AR and H. For values of G lesser than optimal corresponding to inlet temperature of air equals to ambient, higher exergy output rate is achieved for the low value of duct depth and high AR in the range of parameters investigated. If G is high, for an application requiring less temperature increase, then either low AR or high H would give higher exergy output rate. (author)

  20. Control-Oriented Model of Molar Scavenge Oxygen Fraction for Exhaust Recirculation in Large Diesel Engines

    DEFF Research Database (Denmark)

    Nielsen, Kræn Vodder; Blanke, Mogens; Eriksson, Lars

    2016-01-01

    therefore focus on deriving and validating a mean-value model of a large two-stroke crosshead diesel engines with EGR. The model introduces a number of amendments and extensions to previous, complex models and shows in theory and practice that a simplified nonlinear model captures all essential dynamics...... the behavior of the scavenge oxygen fraction well over the entire envelope of load and blower speed range that are relevant for EGR. The simplicity of the new model makes it suitable for observer and control design, which are essential steps to meet the emission requirements for marine diesel engines that take......Exhaust gas recirculation (EGR) systems have been introduced to large marine engines in order to reduce NOx formation. Adequate modelling for control design is one of the bottlenecks to design EGR control that also meets emission requirements during transient loading conditions. This paper...