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Sample records for acondicionado solar para

  1. Aire Acondicionado Solar, para Conjunto de Viviendas en Mexicali, México Solar Air Conditioning for a Housing Compound in Mexicali, Mexico

    Aníbal Luna

    2008-01-01

    Full Text Available El objetivo del presente trabajo es dimensionar y evaluar un sistema de enfriamiento por absorción LiBr-H2O asistido con energía solar y gas natural, para climatizar un conjunto de viviendas en Mexicali, Baja California, México. El análisis de comportamiento horario, diario y mensual en el periodo con mayor demanda de enfriamiento se realiza con el programa TRNSYS 16 y se busca la menor área de captación y la mayor fracción solar. Esto se traduce en el mínimo costo de operación e inversión inicial. Se encontró que el sistema genera condiciones del espacio entre confortablemente caliente y confortablemente frío, según la norma ISO 7730 (2005. Esto se logra a partir de 287 m²detubos evacuados, que aportan el 90% de la energía requerida. El sistema es técnicamente factible, ya que cubre la demanda de enfriamiento durante el periodo de verano y requiere un área de colección similar a la disponible en el conjunto de viviendas.The objective of the present work is to dimension and evaluate an absorption LiBr-H2O cooling system assisted by solar energy and natural gas for air conditioning of a group of housings in Mexicali, Baja California, Mexico. The analysis of the hourly, daily and monthly operating performance in the period with more cooling demand is carried out by mean of TRNSYS 16, and it is seeking the least collection area and the highest solar fraction; that which is translated in the minimum operation cost and initial investment. It was found that the system generates conditions of the space between comfortably warm and comfortably cold, according to ISO 7730 (2005, with 287 m² of evacuated tubes which contribute 90% of the required energy. The system is technically feasible, since it covers the cooling demand during the summer period and it requires a similar collecting area to the available one in the housing compounds.

  2. Voltage controller design for air conditioning; Diseno de controlador de voltaje para aire acondicionado

    Garcia Andrade, R; Lopez Villalobos, J.J; Valderrama Chairez, J; Ramirez, R.L. [Instituto Tecnologico de Nuevo Leon, Guadalupe, Nuevo Leon (Mexico)]. E-mails: roxana_garciaandrade@yahoo.com; xe2n@yahoo.com.mx; jose.valderrama@ieee.org

    2013-03-15

    This paper discusses the design of a voltage controller for an air conditioning system in order to generate additional power in activation or startup of the system, for which as a first stage is presented the modeling power generation of electric current through alternative means, such as solar energy. The results of this study will be the basis for development of the physical prototype of this system controller. [Spanish] El presente trabajo trata sobre el diseno de un controlador de voltaje para un sistema de aire acondicionado con el fin de generar energia adicional en la activacion o arranque de dicho sistema, para lo cual como primer fase se presenta el modelado de la generacion de corriente electrica mediante medios alternos, como lo es la energia solar. Los resultados de este trabajo seran la base para desarrollo del prototipo fisico de este sistema controlador.

  3. Potencial del techo verde, para ahorrar electricidad por aire acondicionado en la edificación

    Ruber Trujillo Samayoa

    2015-01-01

    Full Text Available Introducción: Tanto en México como en el mundo, más de tres cuartas partes de los insumos que se usan en la producción de electricidad provienen de fuentes no renovables, en una realidad donde los techos de las edificaciones son responsables de un consumo importante de electricidad por aire acondicionado. Por lo anterior, el objetivo fue evaluar el aspecto térmico y la eficiencia en el consumo de electricidad de dos aires acondicionados colocados, bajo el Techo de concreto reforzado y el Techo verde, y a la vez utilizar a la geometría analítica como herramienta de análisis en el consumo de electricidad. Método: Aunque inicialmente la metodología de la climatología dinámica, fue desarrollada para el análisis térmico, en este trabajo se retomó para aplicarlo al consumo eléctrico y conjuntándolo con el apoyo de la geometría analítica, a través de ecuaciones de recta que representan promedios anuales, se evidenció las diferencias en el consumo. Resultados: Los resultados obtenidos demuestran que el Techo verde amortigua mejor las temperaturas exteriores, reduce la oscilación térmica y; en el consumo eléctrico, con una diferencia promedio anual de un 28%, el Techo Verde consumió menos energía eléctrica por aire acondicionado. Discusión o conclusión: Se demuestra que conviene el uso de techos verdes en el sitio de estudio y posibilita su aplicación en otros contextos. El trabajo se realizó en periodos de temperaturas extremas opuestas, invierno de 2014 y primavera de 2015.

  4. Controlled environment laboratory for the energy certification of refrigeration and air conditioning systems; Laboratorio de ambiente controlado para la certificacion energetica de sistemas de refrigeracion y aire acondicionado

    Ambriz, Juan Jose; Romero Paredes, Hernando; Dorantes, Ruben [Universidad Autonoma Metropolitana, Mexico, D.F. (Mexico)

    1999-07-01

    In this paper the general characteristics of the Controlled Environment Laboratory (CELAB) are described and some of the possible tests that could be performed in this device to evaluate the energy efficiency in air conditioning systems, domestic refrigeration and industrial refrigeration, as well as tests to evaluate the hydrothermal comfort in national populations, are presented. [Spanish] En este trabajo se describen las caracteristicas generales del Laboratorio de Ambiente Controlado (LAB), y se presentan algunas de las posibles pruebas que podran ser desarrolladas en este dispositivo para evaluar la eficiencia energetica en sistemas de aire acondicionado, refrigeracion domestica y refrigeracion industrial, asi como para pruebas para evaluar el confort hidrotermico en poblaciones nacionales.

  5. SESSA: Expert system for the selection of air conditioning equipment; SESEAA: Sistema experto para la seleccion de equipos de aire acondicionado

    Kemper Valverde, Nicolas; Cardenas Perez, Edgar [Laboratorio de Sistemas Inteligentes, Centro de Instrumentos de la Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D. F. (Mexico)

    1998-12-31

    The problem of selecting air conditioning and refrigeration equipment is quite wide and complex, since it encompasses from the application of the basic principles of physics and of thermodynamics up to the classic engineering design problems; these in turn can be numberless since they vary from place to place depending on multiple factors such as the region geographic and economic conditions. On the other hand, account most be taken of several elements such as windows, walls, and its specific geographical orientation, roofs, floors, partitions, equipment, lighting, etc., all this exerts influence in the complexity that represents the selection process. This paper describes a useful informatics tool to make it easy the selection process in air conditioning installations, taking into account multiple saving and efficient use of energy criteria, reflected in the operation process of these installations. [Espanol] El problema de seleccion de sistemas de aire acondicionado y de refrigeracion es bastante amplio y complejo, ya que abarca desde la aplicacion de los principios basicos de la fisica y la termodinamica hasta los problemas clasicos de diseno de ingenieria; estos a la vez pueden ser innumerables ya que varian de un lugar a otro y de un proyecto a otro, dependiendo de multiples factores tales como las condiciones geograficas y economicas de la region. Por otra parte se deben tomar en cuenta diversos elementos como son: ventanas, muros y sus orientaciones especificas, techos, pisos, particiones, equipos, iluminacion, etc., todo esto influye en la complejidad que representa el proceso de seleccion. En el presente trabajo se describe una herramienta informatica para facilitar el proceso de seleccion de instalaciones de aire acondicionado, tomando en cuenta multiples criterios de ahorro y uso eficiente de energia que se reflejan durante el proceso de operacion de estas instalaciones.

  6. Comportamento pós-colheita de mamões Formosa 'Tainung 01' acondicionados em diferentes embalagens para o transporte Post harvest behavior of Papaya Formosa 'Tainung 01' conditioned in different packings for transportation

    Carlos Eduardo Magalhães dos Santos; Flávio Alencar D'Araújo Couto; Luiz Carlos Chamhum Salomão; Paulo Roberto Cecon; Américo Wagner Júnior; Claudio Horst Bruckner

    2008-01-01

    O objetivo deste trabalho foi avaliar a comportamento pós-colheita de mamões do grupo Formosa híbrido 'Tainung 01', submetidos a diferentes formas de acondicionamento para o transporte rodoviário, desde o local da produção até o mercado atacadista. Foram utilizados mamões colhidos nos estádios 1 (até 10% da área superficial da casca com cor amarela) e 3 (25 a 40% da área superficial da casca com cor amarela), acondicionados sob diferentes formas: a granel, em caixas de madeira, em caixas de p...

  7. Estabilidade sensorial de suco de maracujá pronto para beber acondicionado em latas de aço Sensorial stability of ready-to-drink passion fruit juice packaged in tinplate cans

    Elisabete Segantini Saron

    2007-12-01

    Full Text Available O estudo teve por objetivo avaliar a preservação das características sensoriais e físico-químicas de suco de maracujá pronto para beber acondicionado em latas de três peças em folha-de-flandres eletrossoldadas, com diferentes condições de envernizamento interno do corpo e costura lateral, através de teste de estocagem. O suco de maracujá foi acondicionado em latas com camada nominal interna de 2,0 g de Sn.m-2, com três sistemas de revestimento orgânico interno e condicionado a 25 e 35 °C durante 360 dias. Ocorreu um acentuado decréscimo do conteúdo de ácido ascórbico até os 180 dias, mantendo-se estável até 360 dias em todas as condições estudadas. A avaliação de cor demonstrou o escurecimento do suco até os 120 dias e posteriormente sua descoloração, entre os 300 e 360 dias, nas duas temperaturas estudadas. A avaliação sensorial durante a estocagem demonstrou desempenho similar para todas as latas, sendo inferior apenas para a lata Pó a 35 °C. As principais alterações verificadas no produto ao longo da estocagem foram associadas às alterações intrínsecas à bebida e não à interação suco/embalagem. O estudo permitiu concluir que os três sistemas de envernizamento das latas estudadas podem ser utilizados no acondicionamento de suco de maracujá pronto para beber para uma vida-de-prateleira mínima de 12 meses.The purpose of this work was to evaluate the preservation of the sensorial and physicochemical characteristics of ready-to-drink passion fruit juice packaged in three-piece welded tinplate cans with different internal coatings of the body and side strips, based on a storage test. The product evaluated was ready-to-drink passion fruit juice packaged in cans with an internal layer of 2.0 g.m-2 of tin, with three inner organic coating systems, stored at 25 and 35 °C for 360 days. A sharp decrease in ascorbic acid content was recorded up to day 180, after which it remained constant until the end of

  8. Construction test modules to reduce the air conditioning consumption; Modulos de prueba de edificaciones para reducir el consumo de aire acondicionado

    Acoltzi, Higinio [Instituto de Investigaciones Electricas, (Mexico); Alvarez, Gabriela [CENIDET (Mexico)

    2002-09-01

    In this work a mathematical model of the energy behavior of test modules to scale and its experimental verification is presented. The model determines the electrical energy consumption history, necessary to maintain the comfort conditions in the interior of the modules, with respect to the variation of the materials of the ceilings and windows, to establish the application criteria of these materials in the construction industry. Also are presented the measured results of energy consumption accumulated for the modules with ceilings, of monolithic slab as well as of joist and small arches, with wooden window frames and reflectasol filtrasol and clear glasses. [Spanish] En este trabajo se presenta un modelo matematico del comportamiento energetico de modulos de prueba a escala y su verificacion experimental. El modelo determina la historia del consumo de energia electrica, necesario para mantener las condiciones de confort al interior de los modulos, con respecto a la variacion de los materiales de los techos y ventanas, para establecer criterios de aplicacion de dichos materiales en la industria de la construccion. Tambien se presenta los resultados medidos del consumo de energia acumulada para los modulos con techos, tanto de losa monolitica como de vigueta y bovedilla, con ventanas de marco de madera y vidrios reflectasol, filtrasol y claro.

  9. Estimated saving potential and efficient use of energy in air conditioning by means of the solar protection; Potencial estimado de ahorro y uso eficiente de energia en aires acondicionados mediante la proteccion solar

    Mejia D, David; Morillon G, David; Rodriguez V, Luis [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2001-07-01

    In here it is presented the analysis of the impact of the solar gains through the transparent parts of a prototype house of social interest, located in a dry warm climate. This analysis was made to determine the gains through windows for the summer time and under the following conditions: without outside solar protections, with the use of eaves, solar breakers and finally with the use of both systems of solar protection. The results were compared to obtain the considered potential of energy saving in cooling equipment, that could be obtained in future houses to build. [Spanish] Se presenta el analisis del impacto de las ganancias solares a traves de las partes transparentes de un prototipo de vivienda de interes social, ubicado en un clima calido seco. Dicho analisis se realizo para determinar las ganancias a traves de ventanas para la epoca de verano y bajo las siguientes condiciones: sin protecciones solares exteriores, con el empleo de aleros, con quiebrasoles y finalmente con el empleo de ambos sistemas de proteccion solar. Se compararon los resultados para obtener el potencial estimado de ahorro de energia en equipo de enfriamiento, que se tendria en las futuras viviendas por construir.

  10. Development of a electrothermal model to scale to determine the energy behavior in buildings with air conditioning; Desarrollo de un modelo electrotermico a escala para determinar el comportamiento energetico en edificaciones con aire acondicionado

    Acoltzi, Higinio [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    determinar el comportamiento energetico de modulos de prueba a escala de edificios. El modelo determina la historia del consumo de energia electrica para mantener la condiciones de confort al interior de los modulos, respecto a la variacion de los materiales de los techos y ventanas; todo esto con el objeto de establecer criterios de aplicacion de dichos materiales en la industria de la edificacion. Se presenta los consumos de energia electrica para los modulos con techos de loza monolitica, vigueta y clabovedilla y ventanas con vidrios reflectasol, filtrasol y claro. Finalmente, se presentan los resultados preliminares de la aplicacion del modelo propuesto a un edificio de escala normal. Las mediciones en campo y el modelo electrotermico teorico desarrollado, presenta diferencias promedio de 16%. Los ahorros de energia electrica observados con la aplicacion del modelo electrotermico teorico son: 1) si se cambia el vidrio claro por vidrio filtrasol, se pueden lograr ahorros de energia hasta del 14.5% para la loza de vigueta y bovedilla y de 12.4% para la loza monolitica; o 2) si se cambia el vidrio claro por vidrio reflectasol se pueden obtener ahorros de energia hasta de 28.1% para el caso de loza de vigueta y bovedilla y de 16.8% para la loza monolitica. La mejor opcion es sustituir la loza monolitica y vidrio claro por la loza de vigueta y bovedilla y vidrio reflectasol para obtener hasta un 37% de ahorro. Se muestra el arreglo de dispositivo experimental con los 3 modulos acoplados al aire acondicionado, y una con paracion grafica entre el consumo de energia acumulada teorica y experimental del modulo con loza de vigueta y bovedilla para los vidrios reflectasol, filtrasol y claro. Se da un resumen de los consumos de energia electrica totales.Verificacion experimental para determinar el comportamiento energetico de modulos de prueba a escala de edificios. El modelo determina la historia del consumo de energia electrica para mantener la condiciones de confort al interior

  11. Comportamento pós-colheita de mamões Formosa 'Tainung 01' acondicionados em diferentes embalagens para o transporte Post harvest behavior of Papaya Formosa 'Tainung 01' conditioned in different packings for transportation

    Carlos Eduardo Magalhães dos Santos

    2008-06-01

    Full Text Available O objetivo deste trabalho foi avaliar a comportamento pós-colheita de mamões do grupo Formosa híbrido 'Tainung 01', submetidos a diferentes formas de acondicionamento para o transporte rodoviário, desde o local da produção até o mercado atacadista. Foram utilizados mamões colhidos nos estádios 1 (até 10% da área superficial da casca com cor amarela e 3 (25 a 40% da área superficial da casca com cor amarela, acondicionados sob diferentes formas: a granel, em caixas de madeira, em caixas de papelão ondulado e em caixas plásticas forradas com plástico-bolha (controle, e transportados a Viçosa-MG, distante 750 km da produção, onde os frutos foram avaliados. Após seleção e novo acondicionamento, os frutos foram armazenamento a 24,5 ± 2ºC por 8 dias, com amostragens a cada 2 dias, para avaliação de índice de cor da casca, perda de massa fresca, taxa respiratória, firmeza da polpa e o índice de injúrias mecânicas. Os resultados evidenciaram os efeitos depreciativos das injúrias mecânicas na qualidade final do mamão, sendo que o transporte de frutos a granel, em relação ao controle, promoveu alterações na qualidade pós-colheita dos frutos, com aumento do índice de cor da casca, redução na firmeza da polpa, elevada perda de massa fresca e taxa respiratória, e maiores percentagens de área da casca injuriada, nos dois estádios de coloração estudados (1,14 e 1,21%, respectivamente. As caixas de papelão ondulado e caixas plásticas forradas com plástico-bolha mantiveram baixa a percentagem de área injuriada em relação aos transportados a granel, constituindo-se em alternativas promissoras na manutenção da qualidade pós-colheita de mamão Formosa destinado ao mercado interno.The aim of this study was to evaluate the post harvest behavior of papaya from the hybrid group Formosa 'TAINUNG 01' stored in different packages for road transportation, from the farm to the wholesale market. It was used papaya picked

  12. Heat pumping using the thermal earth gradient to produce air conditioned and hot water with savings of up to 70%; Bombeo de calor utilizando el gradiente termico de la tierra para producir aire acondicionado y agua caliente con ahorros de hasta un 70%

    Alvarez Ramirez, Alejandro [Novaenergia de Mexico S.A. de C.V. (Mexico)

    2003-07-01

    The pumping of heat using the Earth heat as partial energy source bases its principle on which the energy of the ground is constant and the energy efficiency to produce air conditioning and hot water simultaneously is important, obtaining savings up to 70%, comparing itself with the traditional equipment and what these operate of separated way to produce each one of them the cold air and the hot water. The use of this technology presents an opportunity to reduce the energy costs of and the demand of the company. [Spanish] El bombeo de calor utilizando el calor de la tierra como fuente parcial de energia basa su principio en que la energia del suelo es constante y el rendimiento energetico para producir simultaneamente aire acondicionado y agua caliente es importante, obteniendose ahorros hasta de un 70%, comparandose con los equipos tradicionales y que estos operan de manera separada para producir cada uno de ellos el aire frio y el agua caliente. El uso de esta tecnologia presenta una oportunidad para reducir los costos de energia y demanda de la empresa.

  13. Plan de negocio empresa aire acondicionado y ventilación mecánica Cooler Ingeniería

    Espinel Ramírez, Christian David; Romero León, Oscar Fernando

    2013-01-01

    Este trabajo consiste en el plan de negocios de una empresa dedicada a la consultoría, diseño, instalación y venta de sistemas de aire acondicionado y ventilación mecánica llamada Cooler Ingeniería. Los objetivos principales del plan de negocios buscan identificar los servicios y productos que se ofrecerán en el portafolio de la compañía, definir las estrategias de mercado y conocer el monto de la inversión requerida para ser una empresa competitiva y rentable.

  14. Desarrollo de motores stirling para aplicaciones solares

    García Menéndez, David

    2013-01-01

    Los sistemas de conversión termosolar basados en motores Stirling figuran entre las líneas de investigación actuales que pretenden contribuir al uso racional de la energía y al desarrollo sostenible. La presente Tesis Doctoral tiene como objetivo proporcionar criterios de análisis, diseño, fabricación y ensayo útiles para el desarrollo de motores Stirling alimentados con energía solar, a diferentes niveles de salto térmico. La metodología empleada está basada principalmente en técnicas...

  15. Saving 50% of energy in air conditioning and refrigeration; 50% de ahorro de energia en aire acondicionado y refrigeracion

    Sanchez De la Fuente, Rodolfo Javier [Instituto para la Proteccion Ambiental de Nuevo Leon-CAINTRA, Nuevo Leon (Mexico); Bolado Tamez, Jaime Antonio [Industrias AlEn S. A. de C. V., Monterrey (Mexico)

    1998-12-31

    Due to the fact that the air conditioning systems represent up to 70% of the energy consumption in our buildings, to the constant raise of the electric tariffs and to the increment of temperatures in Nuevo Leon State, as well as the restrictions on the use of some refrigerant fluids because of its potential damage to the ozone layer (Montreal Protocol) and the preferential use of refrigerants with low global heating potential (Kioto Protocol). The Camara de la Industria de la Transformacion de Nuevo Leon (Nuevo Leon`s Transformation Industry Chamber) through the Instituto para la Proteccion Ambiental de Nuevo Leon (Nuevo Leon`s Institute for Environmental Protection), create the program ECO-REFRIGERATION whose three missions are: Increase the efficiency of air conditioning and refrigeration equipment, promote the substitution of refrigerants and extend the benefits of these projects to the community in general. [Espanol] Debido a que los sistemas de climatizacion representan hasta el 70% de consumo energetico en nuestros inmuebles, al constante incremento de las tarifas electricas, el incremento de las temperaturas en Nuevo Leon, asi como la restriccion del uso de algunos refrigerantes por su potencial de dano de la capa de ozono (Protocolo de Montreal) y el uso preferente de refrigerantes con bajo potencial de calentamiento global (Protocolo de Kioto), la Camara de la Industria de la Transformacion de Nuevo Leon a traves del Instituto para la Proteccion Ambiental de Nuevo Leon crean el Programa ECO-REFRIGERACION cuyas tres misiones son: Incrementar la eficiencia de los equipos de aire acondicionado y refrigeracion, promover la sustitucion de refrigerantes y extender los beneficios de este proyecto a la comunidad en general.

  16. Dimensionamiento montaje y análisis de funcionamiento de una instalación de aire acondicionado basado en un sistema solar térmico y una máquina de absorción de pequeña potencia

    Martínez Sánchez, Rafael

    2008-01-01

    El objeto de este proyecto incluye el dimensionamiento, montaje, explotación y monitorización de una instalación de producción de frío con energía solar térmica y una máquina de absorción. La instalación solar térmica estará destinada a: • Abastecimiento de las necesidades de refrigeración en verano. • Abastecimiento de las necesidades de calefacción en invierno. El aprovechamiento térmico de la energía solar incidente, conllevará una importante disminución del consumo de...

  17. Evaluation of energy saving in pilot projects of window type air conditioning equipment in the domestic sector; Evaluacion del ahorro de energia en proyectos pilotos en equipos de aire acondicionado tipo ventana en el sector domestico

    Duran Ramirez, Ricardo [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

    2001-07-01

    The present work shows the energy saving when replacing low efficiency window type air conditioning equipment, for higher efficiency equipment, as well as the necessary parameters to identify the results obtained by the pilot projects of substitution of conventional equipment for other more efficient in the domestic sector. [Spanish] El presente trabajo muestra los ahorros de energia al sustituir equipos de aire acondicionado tipo ventana de baja eficiencia, por equipos de mayor eficiencia, asi como los parametros necesarios para identificar los resultados obtenidos, por los proyectos pilotos de sustitucion de equipos convencionales por otros mas eficientes en el sector domestico.

  18. Determinación de Metales Pesados y Sales Solubles en Suelos de Cultivo Acondicionados con Lodos Residuales

    Silvia Ruth Paredes Reyes

    2001-01-01

    Full Text Available Este proyecto tiene por objeto realizar una determinación de metales pesados (Pb, Cd, Cr, Zn y sales solubles de Na, K, Mg y Ca en suelos de cultivo del rancho "La Xaropa" acondicionados con lodos residuales de la Planta de Tratamiento Municipal de Aguascalientes. De la misma manera realizar las mismas determinaciones en tierras de cultivo que no han sido reactivadas con lodos, esto es con el propósito de comparar dos condiciones diferentes. Es importante conocer la presencia de metales pesados porque son tóxicos para los organismos, ya que alteran su metabolismo y pueden provocar su muerte. Los metales pesados, pueden pasar de la tierra hacia el organismo del hombre, a través de la cadena alimenticia provocando graves problemas de salud. La utilización de los lodos puede contribuir a aumentar la salinidad del mismo y disminuir su fertilidad. Las determinaciones se llevaron a cabo utilizando el método espectrofotométrico de absorción atómica. Los resultados muestran que se encontró un incremento en el contenido de cromo y zinc. En tierras de cultivo sin lodos adicionados se encontraron 627.43 Kg/ha y en las tierras acondicionadas con lodos 780. 95 Kg/ ha. Los resultados de zinc en tierras sin lodo adicionado muestran 394.27 Kg/ha. Y en tierras con lodos 398. 1 1 K/ha. Los resultados de la determinación de sales solubles también muestran incremento en la concentración de las mismas.

  19. Seguidor Solar de Dos Ejes para un Horno Solar Two-Axis Sun Tracking System for a Solar Furnace

    Gabriel Villeda

    2011-01-01

    Full Text Available Se presenta el diseño y fabricación de un seguidor solar de dos ejes (rotación-elevación, el cual controla un helióstato de un horno solar para la cocción de tabiques de arcilla. El sistema trabaja con motores controlados desde una computadora personal. El algoritmo para el seguidor solar se desarrolló en un lenguaje de programación visual, calcula los ángulos de seguimiento primario y secundario del helióstato y los despliega en una pantalla. El microcontrolador está programado para controlar el funcionamiento de los motores a pasos, los cuales mueven el helióstato del horno solar. El seguimiento primario y secundario es el mismo para los equinoccios, mientras que para los solsticios son diferentes debido a que durante el verano en el hemisferio norte existe mayor altura solar que en invierno. El seguidor solar permite una captación más eficiente de la radiación solar debido a que sigue minuto a minuto el movimiento aparente del Sol.The design and manufacture of a two-axis sun tracking system (rotation-elevation, which controls a heliostat of a solar furnace for clay brick firing is presented. The system works with motors controlled through a personal computen The algorithm for the sun tracking system was developed in a visual programming language, calculates the primary and secondary tracking angles of the heliostat and shows them in a screen. The microcontroller is programmed to control the step driver engines, which move the heliostat of the solar furnace. The primary and secondary tracking is the same for the equinoxes, whereas for the solstices are different because the solar altitude is greater in summer than in winter in the northern hemisphere. The sun tracking system permits a more efficient capture of the solar radiation since it continuously follows the apparent movement of the Sun.

  20. Energy saving by means of air conditioning equipment replacement and the household application of thermal insulation; Ahorro de energia electrica por reemplazo de equipos de aire acondicionado y aplicacion de aislamiento termico en viviendas

    Peralta Solorio, Jose Luis [Fideicomiso para el Ahorro de la Energia (Mexico)

    2005-07-15

    An extension study of the Financing Program for Energy Saving looked for the evaluation of the electric energy saving potential obtained by the replacement of air conditioning equipment and the application of thermal insulation in 30 houses of two Mexican cities with warmth climate. In a joint effort with Comision Federal de Electricidad the consumption files of the users were analyzed and field measurements of electric demand and of refrigeration were made. As a following step the change of the refrigeration necessities derived from the application of thermal insulation were evaluated as well as the energy efficiency improvement obtained by the substitution of the air conditioning equipment and the favorable results obtained by the implementation of both measures - thermal insulation and change of air conditioning equipment in a joint form. This way, as a conclusion, the optimum sequence of application of these measures is revealed. [Spanish] Un estudio extension del Programa de Financiamiento para el Ahorro de Energia Electrica busco evaluar el potencial de ahorro de energia electrica alcanzado por el reemplazo de equipos de aire acondicionado y la aplicacion de aislamiento termico en 30 viviendas de dos ciudades mexicanas con clima calido. En un esfuerzo conjunto con la Comision Federal de Electricidad se analizaron los historiales de consumo de los usuarios y se efectuaron las mediciones de campo de demanda electrica y de refrigeracion. Como paso siguiente se valoro el cambio en las necesidades de refrigeracion derivado de la aplicacion de aislamiento termico al igual que la mejora en eficiencia energetica obtenida por la sustitucion de aire acondicionado y se identificaron los resultados favorecedores arrojados por la implementacion de ambas medidas -aislamiento termico y cambio de equipo de aire acondicionado- en forma conjunta. De esta manera, como conclusion, se devela la mas optima secuencia de aplicacion de estas medidas.

  1. Sistema de Secado Solar para Frutos Tropicales Drying Solar System for Tropical Fruits

    Antonio R.S Costa

    2007-01-01

    Full Text Available Se presenta la construcción de un secador solar en el que se realizaron ensayos de secado de frutos tropicales y se desarrolla el modelado matemático simplificado del proceso. Se empleó un sistema de adquisición de datos y control de temperatura de secador, usando energía de convección forzada de aire y radiación solar. El sistema es complementado, para emergencia, con resistencias eléctricas. Se realizaron experimentos de secado de bananas en forma de placa, obteniéndose sus pesos y contenidos acuosos en función del tiempo. Se realizó el modelado matemático del proceso de secado, con la ecuación de transferencia de materia, obteniéndose la difusividad del agua en los frutos. Los valores obtenidos concuerdan con datos de la literatura y pueden ser empleados en el diseño preliminar del secador. El sistema estudiado entrega información para calcular la cantidad de agua evaporada del alimento para una determinada temperatura promedio del secador solar, la potencia y el tiempo necesarios para el secado.The construction of a solar dryer is presented in this work. Experimental runs for the drying of tropical fruits were performed and a simplified model of the drying process. A data acquisition system was used and the drying temperature was controlled by means of an air stream heated by a simultaneous process of forced convection and solar radiation. The system also included electric resistances, for emergency situations. Drying experiments were performed with banana slabs, monitoring their weight and water content as a function of time. A simplified mathematical model was developed considering only the mass transfer equation, estimating the water diffusivity on the fruits. The values of these diffusivities are in agreement with other values reported in the literature, so they can be used in a preliminary design of solar dryer. The system studied provides a way of calculating the amount of water to be evaporated in the dryer at a

  2. Rational use of energy in air conditioning equipment, through an appropriate selection of the main equipment; Uso racional de la energia en equipos de aire acondicionado, mediante la eleccion apropiada del equipo principal

    Reyes Zuniga, Jose de Jesus; Herrera Ramos, Manuel [Instituto Mexicano del Petroleo (Mexico)

    1996-07-01

    This paper presents an analysis to diminish the consumption of energy in central air conditioning equipment through an appropriate selection of the equipment. The analysis shows the levels of security and toxicity of the refrigerant, the operational, constructive and economic advantages of the equipment, taking as reference the cooling demand and expenses of energy consumption, as well as the ecological impact derived from the use of the refrigerant. Finally, an economic analysis is presented, involving the expenses of the equipment, operation, maintenance, costs of the consumption of used fluids, et cetera. [Spanish] Uso racional de la energia en equipos de aire acondicionado, mediante la eleccion apropiada del equipo principal. Este trabajo presenta un analisis para disminuir el consumo de energia en los equipos centrales de aire acondicionado mediante la seleccion apropiada del equipo. El analisis muestra los niveles de seguridad y toxicidad del refrigerante, las ventajas operativas, constructivas y economicas del equipo, tomando como referencia la demanda de enfriamiento y gastos de consumo de energia, asi como el impacto ecologico derivado de su empleo del refrigerante. Finalmente, se presenta un analisis economico, involucrando los gastos del equipo, operacion, mantenimiento, costos de consumos de fluidos utilizados, etcetera.

  3. Control system for solar tracking based on artificial vision; Sistema de control para seguimiento solar basado en vision artificial

    Pacheco Ramirez, Jesus Horacio; Anaya Perez, Maria Elena; Benitez Baltazar, Victor Hugo [Universidad de onora, Hermosillo, Sonora (Mexico)]. E-mail: jpacheco@industrial.uson.mx; meanaya@industrial.uson.mx; vbenitez@industrial.uson.mx

    2010-11-15

    This work shows how artificial vision feedback can be applied to control systems. The control is applied to a solar panel in order to track the sun position. The algorithms to calculate the position of the sun and the image processing are developed in LabView. The responses obtained from the control show that it is possible to use vision for a control scheme in closed loop. [Spanish] El presente trabajo muestra la manera en la cual un sistema de control puede ser retroalimentado mediante vision artificial. El control es aplicado en un panel solar para realizar el seguimiento del sol a lo largo del dia. Los algoritmos para calcular la posicion del sol y para el tratamiento de la imagen fueron desarrollados en LabView. Las respuestas obtenidas del control muestran que es posible utilizar vision para un esquema de control en lazo cerrado.

  4. Solar energy as fuel to move the world; La energia solar como combustible para mover al mundo

    Fernandez, Arturo; Gamboa, Sergio [Centro de Investigacion en Energia (CIE) de la UNAM, Temixco, Morelos (Mexico)

    2010-07-01

    Among the technologies that can be used to take properly advantage of the Sun, we have the development of various solar devices, ranging from the solar collectors, equipment that convert the solar radiation into heat, until the solar cells that convert sunlight into electricity. The development and implementation of these devices in various countries of the world, has allowed us to evaluate the technical feasibility of the technologies associated with the development and use of Renewable Energies to solve the global energy problems, and, in this way, achieve the long-awaited energy independence to which aspire all the nations of the planet. [Spanish] Entre las tecnologias que se pueden utilizar para aprovechar de forma adecuada al Sol, tenemos el desarrollo de diversos dispositivos solares, los cuales van desde los captadores solares, equipos que convierten la radiacion solar en calor, hasta las celdas solares, que convierten la luz del Sol en electricidad. El desarrollo e implementacion de estos dispositivos en diversos paises del mundo, han permitido evaluar la factibilidad tecnica de las tecnologias asociadas al aprovechamiento y uso de las Energias Renovables para resolver los problemas energeticos globales, y, de esta forma, conseguir la tan ansiada independencia energetica a la que aspiran todas las naciones del planeta.

  5. Seguidor solar adaptativo basado en un controlador lógico programable para paneles fotovoltaicos

    Celso de la Cruz Casaño; Carlos León Adauto; Jhosmel Mandujano Espinal; Rudy Cáceres Ravichagua; Isaac Rojas Malpartida

    2012-01-01

    Objetivos: Desarrollar un sistema de seguimiento solar adaptativo para paneles solares fotovoltaicos que no necesitan una configuración inicial. Métodos: Se utilizó el método estructuralista, en el cual se observa la realidad, se construye modelos y se analiza la estructura. Se utilizaron bloques de programación del controlador lógico programable (PLC) y de modelos de mecanismos para construir el modelo del seguidor solar; además se aplicó teorías de ingeniería de control como la estabilidad ...

  6. Solar drying: An appropriate technology for the north Argentina; Secado solar: Una tecnologia apropiada para el norte argentino

    Zurlo, Hugo D; Vergara, Liliana; Spotorno, Ruben; Benitez, Francisco; De Pedro, Jorge; Cervino, Veronica; Monzon, Sergio [Universidad Tecnologica Nacional, Chaco (Argentina)

    2000-07-01

    The results concerning to solar drying of nutritious products for rehearsed a low cost solar dryer, adapted to the area, composed by a plane solar collector of 2 m{sup 2} and a drying camera with capacity for, approximately, 5 kg of product. The objectives of the work were: a) to develop a low cost solar dry, capable to dehydrate products for human alimentary use; b) to transfer the developed technology to low resources rural communities through the INCUPO (Institute of Popular Culture) and to small producers through the INTA (National Institute of Agricultural Technology) and c) to diffuse the practice of the solar drying among small producers. The diffusion and transfer of the developed technology to small rural producers, contribute to improve their quality of life when facilitating them additional revenues for productive diversification, besides the contribution to the sustainable use of the forest like source of non conventional nutritious resources contributing to the task of cultural rescue faced by organizations like the INCUPO. [Spanish] Se exponen los resultados concernientes al secado solar de productos alimenticios para consumo humano. Se diseno, construyo y ensayo un secador solar de bajo costo, adaptado a la zona, compuesto por un colector solar plano de 2m{sup 2} y una camara de secado con capacidad para, aproximadamente, 5 kg de producto fresco. Los objetivos del trabajo fueron: a) desarrollar un secadero solar de bajo costo, apto para deshidratar productos para uso alimentario humano; b) transferir la tecnologia desarrollada a comunidades rurales de bajos recursos a traves del INCUPO (Instituto de Cultura Popular) y a pequenos productores a traves del INTA (Instituto Nacional de Tecnologia Agropecuaria) y c) difundir la practica del secado solar entre productores frutihorticolas. La difusion y transferencia de la tecnologia desarrollada a pequenos productores rurales, contribuye a mejorar su calidad de vida al posibilitarles ingresos adicionales

  7. Energy saving: optimal use of air conditioning equipment by means of the solar control; Ahorro de energia: uso optimo de los acondicionadores de aire mediante el control solar

    Mejia D, David; Morillon G, David; Rodriguez V, Luis [Universidad Nacional Autonoma de Mexico (Mexico)

    2001-09-01

    In this article the evaluation of the solar heat gains through the transparent parts of a building (houses of social interest) is presented; with the purpose of determining the heat gains through windows during summer time and under the following conditions: without solar protection, with the use of eaves, solar breakers and, finally, with the use of both elements. With the determined percentage of the diminution of heat gains, the considered potential of energy saving in air conditioning was obtained that would be available if the houses were constructed with solar control. [Spanish] En este articulo se presenta la evaluacion de las ganancias de calor solar a traves de las partes transparentes de un edificio (viviendas de interes social); con el objeto de determinar las ganancias de calor a traves de ventanas para la epoca de verano y bajo las siguientes condiciones: sin proteccion solar, con el empleo de aleros, con quiebrasoles y, finalmente, con el empleo de ambos elementos. Con el porcentaje determinado de la disminucion de ganancias de calor, se obtuvo el potencial estimado de ahorro de energia en aire acondicionado que se tendria si las viviendas se construyen con control solar.

  8. Thermal performance in layer hen house with natural acclimatization/ Desempenho térmico de aviário de postura acondicionado naturalmente

    Luiz Antônio Targa

    2008-08-01

    Full Text Available The work aimed at presenting analyses and comparisons of the thermal performance of a laying hens housing in the region of Bastos, in the state of São Paulo, adapted from natural alternatives of acclimatization, having a not adapted housing as reference, that is, of a more common typology in the area, and another one, artificially acclimatized. The index evaluated was the temperature and humidity (THI, the black globe temperature and humidity index (GTHI and the thermal radiation charge (TRC. It was calculated from the measurement of the temperature of dry bulb, temperature of wet bulb, temperature of black globe and air speed. The measurements were made both in the intern and the extern environment, at four times (5 a.m, 11a.m., 3 p.m. and 4 p.m. o´clock and in two seasons (late spring and early summer, for ten days in a row. The results allow to conclude that the house naturally acclimatized (NA has presented intermediate performance as compared with the others, making it to possible to control environment at adequate levels only during spring.O objetivo do trabalho foi apresentar análises e comparações sobre o desempenho térmico de um galpão para aves de postura, na região de Bastos, estado de São Paulo, adaptado a partir de alternativas naturais de acondicionamento, tendo como referências um galpão não adaptado, ou seja, de tipologia mais comum na região e outro acondicionado artificialmente. Os parâmetros avaliados – Índice de Temperatura e Umidade (ITU, o Índice de Temperatura de Globo Negro (UTGU, Umidade e a Carga Térmica de Radiação (CTR – foram calculados a partir de medidas de temperatura de bulbo seco, temperatura de bulbo úmido, temperatura de globo negro e velocidade do ar. As medições foram realizadas, nos ambientes internos e externos, em quatro horários (5, 11, 15 e 16 horas na estação primavera e verão, durante dez dias consecutivos. Os resultados obtidos permitiram concluir que o sistema de

  9. Sistema de energía solar fotovoltaica aislado para vivienda unifamiliar aislada

    Sánchez Quiroga, David

    2012-01-01

    El objetivo del presente Trabajo Fin de Grado es diseñar un sistema de energía solar fotovoltaica para una vivienda unifamiliar aislada de modo que sea autosuficiente energéticamente mediante un sistema fotovoltaico. Un sistema fotovoltaico completo, con gran capacidad de acumulación, puede garantizar un suministro fiable hasta varios días con ausencia de sol, y con una inversión mucho inferior al coste de hacer llegar la red eléctrica al emplazamiento. Para conseguir un sum...

  10. Diseño de captador solar cilíndrico parabólico para aplicaciones rurales en Paraguay

    Paredes Velasco, Carmen

    2012-01-01

    El objetivo del presente proyecto es el diseño de un concentrador solar cilíndrico parabólico para calentamiento de aceite, que posteriormente calentara aire mediante un intercambiador de calor. El aire se canalizara para deshidratar alimentos. Se estudian los diferentes tipos de colectores solares y el recurso solar de la zona. Además se realiza el diseño estructural del captador y del seguimiento solar de este, puesto que el destino final del colector es específico. También se analizan las ...

  11. Seguidor solar adaptativo basado en un controlador lógico programable para paneles fotovoltaicos

    Celso de la Cruz Casaño

    2012-12-01

    Full Text Available Objetivos: Desarrollar un sistema de seguimiento solar adaptativo para paneles solares fotovoltaicos que no necesitan una configuración inicial. Métodos: Se utilizó el método estructuralista, en el cual se observa la realidad, se construye modelos y se analiza la estructura. Se utilizaron bloques de programación del controlador lógico programable (PLC y de modelos de mecanismos para construir el modelo del seguidor solar; además se aplicó teorías de ingeniería de control como la estabilidad de sistemas dinámicos y control adaptativo. La prueba de estabilidad y el funcionamiento correcto se analiza utilizando todo el sistema en conjunto, luego, se validan estos análisis con las simulaciones y experimentaciones. Resultados: Se presentan resultados de simulación y experimentación, en los cuales se hace evidente que el controlador adaptativo mantiene el error de control de seguimiento muy bajo a pesar de las condiciones nubladas. En las simulaciones y experimentaciones no se requirió una configuración inicial; este hecho es uno de los requisitos que se busca alcanzar en los objetivos. La ventaja de la adaptación es que el seguidor solar seguirá la trayectoria del sol aun cuando este se encuentre oculto por las nubes. Conclusiones: El aporte fue brindar un diseño novedoso de un seguidor solar cronológico adaptativo. El algoritmo de control adaptativo evita la configuración inicial del seguidor solar cronológico.

  12. Development of a solar tracker for photovoltaic applications; Desenvolvimento de um rastreador solar para aplicacoes fotovoltaicas

    Carvalho, Daniel Rizzo; Lacerda Filho, Adilio Flauzino de; Resende, Ricardo C. [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. Engenharia Agricola], E-mail: daniel.carvalho@ufv.br; Possi, Maurilio A. [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. de Ciencia da Computacao; Ferreira, Ana Paula S. [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. de Fitotecnia

    2012-11-01

    In this work are presented the design, construction and relevant results related to the production of electricity using a photovoltaic panel attached to the solar tracking mechanism. The objective was to develop a tracking device with high accuracy, reliable, low cost, high efficiency and easy operation, aiming at the possibility of residential, agricultural and industrial use of solar photovoltaic technologies with high efficiency of conversion. Was evaluated the performance of the tracker, comparing it to a fixed system and based on results analyzed, was observed a significant increase in energy production of photovoltaic panel attached to the tracking system, in relation to the fixed system the slope of the local latitude. Its performance was satisfactory, electromechanical structure requires no maintenance during the trial even when exposed to various weather conditions. The system showed great potential for application, usability and effectivity. (author)

  13. Solar Water disinfection for human consumption; Desinfeccao Solar de Agua para consumo humano

    Gomes, A.; Vilar, V.; Boaventura, R.

    2008-07-01

    In this work a pilot plant with 0.59 m{sup 2} of solar collectors has been used for studying the disinfection by solar photo catalysis of waters contaminated with Escherichia coli, Enterococcus faecal or humic acids. the results obtained showed a higher resistance of Enterococcus to the photo catalytic treatment ([TiO{sub 2}] =50 mg/L) compared with E. coli, being necessary a higher amount of UV energy for killing them, using an initial bacteria concentration of 1x10{sup 5} CFU/mL. For the treatment of water contaminated with humic acids was applied 20 kJ UV/L to reduce the TOC concentration from 6.9 mg/L to 1 mg/L. (Author)

  14. Novel solar air Heater for high temperatures; Novedoso Calentador solar de aire para altas temperaturas

    Rincon, E. A.; Duran, M. D.; Lentz, A. E.

    2008-07-01

    A novel solar air heater that allows to reach temperatures of the order of 100 degree centigrade with thermal efficiencies superior to 50% due to a solar concentrator and the reduction of thermal losses from the air when circulating between the absorber and mirrors of section of circular arc, well isolated of the outside surrounding. The receiver consists of a concentrator with wedges of plastic transparency that make the function of lenses. The light refracted by the wedges enters to a series of concentrators PC type truncated optimally so that the space among them allows the positioning of the absorber, who are covered metallic segments with selective film. Its excellent performance makes ideals applications as Sauna bath, the drying at high temperature, and systems for conditioning of air. (Author)

  15. Estudio y diseño en la optimización solar fotovoltaica para una vivienda unifamiliar

    Avalos Navarro, Cristina

    2007-01-01

    El presente proyecto tiene por objeto llevar a cabo el diseño de una cubierta solar fotovoltaica conectada a la red eléctrica e integrada en una vivienda unifamiliar, localizada en la calle Andréu Planes de Vilanova i la Geltrú. Para conseguir el objetivo de este estudio se ha estudiado en profundidad los términos relacionados con las energías renovables y más extensamente la energía solar fotovoltaica. Para llegar a entender los términos relacionados con la energía solar fotovoltaic...

  16. Behavior of a portable solar dryer for pineapple fiber Comportamento de um secador solar para fibras de abacaxi

    Róger Moya

    2012-12-01

    Full Text Available In Costa Rica, there has been a growing interest to use pineapple fiber from plant, for which current processes need to be improved or new processes need to be developed, with emphasis on drying methods. This work presents the design and evaluation of the behavior of a prototype portable solar dryer in four sites of Costa Rica. The design describes the main parts of the dryer, as well as how they were constructed. The behavior was evaluated according to temperature and relative humidity inside e outside the chamber, and the influence of direct and indirect solar radiation. In order to achieve improved dryer efficiency, a dehumidifier was used to control relative humidity, and a heating system was implemented during the hours of low temperature, low solar radiation and high relative humidity. Based on drying time, final moisture content of fibers of pineapple leaves from plant, and the varying hours when fibers were put to dry, the evaluation of the dryer revealed that the best fiber-drying interval is from 6h00 to 14h00, and after that, it is convenient to inject hot air and use a dehumidifier in the dryer in order to increase its efficiency.Na Costa Rica, o interesse pelo uso da fibra proveniente da folha de abacaxizeiro. Tem almentado e essa atividade precisa de melhoramento ou implementação de novos processos para alcançar maior eficiência, principalmente na secagem da fibra. O presente trabalho apresenta o design e comportamento de uma protótipo portátil de secadora solar em 4 sites geográficos da Costa Rica. Estão descritas as principais partes do secador, bem como a metodologia de construção. O comportamento foi avaliado de acordo com a temperatura e umidade relativa interna e externa da câmara e a influencia da radiação direta e indireta. Com a finalidade de melhorar a eficiência da secadora, foi usado um desumidificador para controlar a umidade relativa e ainda um sistema de aquecimento durante as horas de baixa temperatura

  17. Marco de trabajo para la generación de software para la gestión de sistemas de energía solar

    Martínez Marchena, Ildefonso

    2015-01-01

    El auge que están alcanzando los sectores relacionados con la gestión de sistemas energéticos y en especial, los relacionados con las energías renovables, están propiciando la necesidad de disponer de mecanismos para la monitorización y la vigilancia energética de los mismos. El objetivo de esta tesis es la de proponer y desarrollar un marco de trabajo, integrado con una metodología y procedimientos, para generar programas para la monitorización y supervisión de sistemas de energía solar. ...

  18. Diseño del campo de heliostatos para torres solares de receptor central

    Gómez Cristóbal, Alfonso

    2011-01-01

    En el presente proyecto se va a presentar una modelización matemática, en la aplicación Matlab, para realizar el diseño preliminar de un campo solar de heliostatos de una central termoeléctrica, basada en la tecnología de concentración solar con receptor central de torre. Primero, se estudiará el principal recurso energético con el que cuenta la humanidad, el Sol, sus características, cómo llega su energía a la Tierra en forma de radiación, y los distintos procesos que determinan la distribuc...

  19. Molinos solares para mejorar la vida de las mujeres. Proyecto Naaj.

    Arteaga, Ana

    2006-01-01

    En las zonas rurales africanas, aisladas de la red eléctrica, la energía solar es casi la única posibilidad de acceso a una electricidad que pueda mejorar sus difíciles condiciones de vida. El Sahel reúne las condiciones idóneas para la implantación de molinos solares: un alto grado de radiación y la necesidad de molienda de un alimento básico (el mijo). En la región de Louga se dan, además, altos niveles de organización comunitaria y un destacado papel de la mujer. El proyecto Naaj de molino...

  20. BSSDATA - um programa otimizado para filtragem de dados em radioastronomia solar

    Martinon, A. R. F.; Sawant, H. S.; Fernandes, F. C. R.; Stephany, S.; Preto, A. J.; Dobrowolski, K. M.

    2003-08-01

    A partir de 1998, entrou em operação regular no INPE, em São José dos Campos, o Brazilian Solar Spectroscope (BSS). O BSS é dedicado às observações de explosões solares decimétricas com alta resolução temporal e espectral, com a principal finalidade de investigar fenômenos associados com a liberação de energia dos "flares" solares. Entre os anos de 1999 e 2002, foram catalogadas, aproximadamente 340 explosões solares classificadas em 8 tipos distintos, de acordo com suas características morfológicas. Na análise detalhada de cada tipo, ou grupo, de explosões solares deve-se considerar a variação do fluxo do sol calmo ("background"), em função da freqüência e a variação temporal, além da complexidade das explosões e estruturas finas registradas superpostas ao fundo variável. Com o intuito de realizar tal análise foi desenvolvido o programa BSSData. Este programa, desenvolvido em linguagem C++, é constituído de várias ferramentas que auxiliam no tratamento e análise dos dados registrados pelo BSS. Neste trabalho iremos abordar as ferramentas referentes à filtragem do ruído de fundo. As rotinas do BSSData para filtragem de ruído foram testadas nos diversos grupos de explosões solares ("dots", "fibra", "lace", "patch", "spikes", "tipo III" e "zebra") alcançando um bom resultado na diminuição do ruído de fundo e obtendo, em conseqüência, dados onde o sinal torna-se mais homogêneo ressaltando as áreas onde existem explosões solares e tornando mais precisas as determinações dos parâmetros observacionais de cada explosão. Estes resultados serão apresentados e discutidos.

  1. Propuesta de un banco de colectores solares para climatizar una piscina y molino de bombeo para el espejo de agua de un hotel.

    Leovel Ismael Aguiar Bolaños

    2010-10-01

    Full Text Available En este trabajo se realiza una propuesta de un banco de colectores solares para la obtención de agua caliente en la climatización de una piscina y otra de un molino de viento de extracción de agua salada a partir de energía eólica para el Hotel Sandals de Varadero. La revisión bibliográfica evidencia resultados acerca del comportamiento de la capacidad instalada para el calentamiento y extracción de agua a partir de energía renovable tanto en Cuba como en el Mundo. Se realiza el procesamiento de los datos climatológicos y se emplea Software TK Solver para dimensionar el sistema. El cálculo económico realizado como una variable factible la utilización de un banco de colectores solares en el calentamiento de la piscina y la extracción de agua salada de un pozo para los espejos de agua del hotel.

  2. Solar system design to heating water for a biodigester; Diseno de un sistema solar de calentamiento de agua para un biodigestor

    Gutierrez Castro, Lucia Monica; Quinto Diez, Pedro [Escuela Superior de Ingenieria Mecanica y Electrica, Instituto Politecnico Nacional, Mexico, D.F. (Mexico)]. E-mail: moni-80-lgc@hotmail.com; pqd510@hotmail.com; Tovar Galvez, Luis Raul [Centro Interdisciplinario de Investigaciones de Estudios sobre Medio Ambiente y Desarrollo, Instituto Politecnico Nacional, Mexico, D.F. (Mexico)]. E-mail: ltovarg@ipn.mx

    2010-11-15

    In this paper a Solar System of Heating Water (SSHW) to provide energy to a biodigester which produces biogas located in the Interdisciplinary Center of Investigation of Studies About Environment and Development (CIIEMAD) is assessed. This evaluation is made by means of the f Method considerating the extraterrestrial radiation, the earth radiation in the zone and the necessary energy to maintain at 55 degrees Celsius the mixture inside the biodigester. The data were introduced in the SOLAR program to calculate both the harnessing area m{sup 2} and the storage capacity in L/m{sup 2}. To guarantee the good performance of the SSHW, a control and monitoring system for the temperature of the mix inside the biodigester is proposed. It also controls the input and output temperature to the solar collectors, as well as the cost analysis which shows the savings of fuel of the SSHW with a conventional system to heating water. [Spanish] En este articulo se evalua un sistema solar de calentamiento de agua (SSCA) para proveer energia a un biodigestor que forma parte del sistema de generacion de biogas (SGB) ubicado en el Centro Interdisciplinario de Investigaciones de Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD). Dicha evaluacion se realiza por medio del Metodo f de diseno que considera datos de radiacion terrestre, radiacion extraterrestre sobre la zona y la energia necesaria para mantener la temperatura de la mezcla dentro del biodigestor a 55 grados centigrados. Los datos fueron introducidos en el programa SOLAR para el calculo del area de captacion en m{sup 2} y la capacidad de almacenamiento en L/m{sup 2}. Para garantizar el buen funcionamiento del SSCA se propone un sistema de control y monitoreo de la temperatura de la mezcla dentro del biodigestor. Tambien se controla la temperatura de entrada y salida a los colectores solares, asi como el analisis de costos que muestra el ahorro de combustible del SSCA con un sistema convencional de calentamiento de agua.

  3. Modelización numérica para el estudio de celdas solares basadas en nanoestructuras semiconductoras

    Cédola, Ariel P.; Cappelletti, Marcelo Angel; Casas, Guillermo; Peltzer y Blancá, Eitel Leopoldo

    2013-01-01

    En este trabajo se presenta el estudio mediante simulaciones por computadora de celdas solares de GaAs con puntos cuánticos de InAs (InAs/GaAs QDSCs). El propósito es investigar desde el punto de vista teórico la interacción entre los QDs y el semiconductor matriz, y analizar detalladamente la influencia de la densidad y cantidad de capas de los QDs sobre la respuesta de la celda a la radiación solar. El modelo implementado, basado en ecuaciones de arrastre-difusión para el GaAs y ecuaciones ...

  4. Termocal, software para el cálculo de calentadores solares para su empleo en instalaciones agrícolas (Uso de varios métodos

    Enrique Álvarez Torres

    2010-01-01

    Full Text Available Se expone el manual del usuario, para desarrollar el trabajo con el software "TERMOCAL". Este programa dentro de sus variadas opciones realiza las operaciones fundamentales de calcular la demanda térmica solar de un local por varias vías, partiendo de distintos factores que influyen en dichos cálculos y calcula los valores de las dimensiones de los colectores y almacenes (depósitos de agua de energía, de dichos sistemas tecnológicos. Se ejecuta sobre cualquier sistema operativo, no requiere del montaje de ningún paquete informático para su funcionamiento, se ejecuta en cualquier tipo de computadora y con el empleo mínimo de su memoria, presenta un ambiente de trabajo ilustrativo y funcional, la entrada de la información inicial es en bloque.

  5. Solar thermal power plants for heat and electricity generation; Presentacion de plantas termosolares para generacion de calor y energia electrica

    Estrada Cajigal, V. [Solartronic S. A. de C. V., Cuernavaca (Mexico); Manzini, F.; Sanchez, A. [Laboratorio de Energia Solar (IIM-UNAM), Temixco (Mexico)

    1992-12-31

    Solar thermal technology is presented for concentration into a point for the production of heat and energy in small and large scale, emphasis is made on the capacity for the combination with current technologies using fossil fuels for electricity generation and process steam, increasing the global efficiency of the power plants and notably reducing the pollutants emission to the air during the insolation hours. It is successfully compared with other solar-thermal technologies. [Espanol] Se presenta la tecnologia termosolar de concentracion puntual para produccion de calor y de energia en pequena y gran escala, se enfatiza su capacidad de combinacion con las tecnologias actuales que utilizan combustibles fosiles para produccion de electricidad y vapor de proceso, aumentando la eficiencia global de las plantas y reduciendo notablemente sus emisiones contaminantes a la atmosfera durante las horas de insolacion. Se le compara exitosamente con otras tecnologias termosolares.

  6. Development of applications in Internet for the calculation of solar control devices; Desarrollo de una aplicacion en Internet para el calculo de dispositivos de control solar

    Perez V, Jesus B; Robles G, Saul; Villa M, Hector A; Cabanillas L, Rafael E [Universidad de Sonora, Hermosillo, Sonora (Mexico)

    2000-07-01

    In this work the development of an interactive software, visible over the World Wide Web, is presented to support the basic calculation required to control the solar gain inside buildings and houses. The site has two main parts: one part describes in a very required parameters to design devices for the control of the illumination inside the buildings, like overhangs and wingwalls for shading. The other part has the routines and procedures to calculate the sun position for any date and position over the earth, and the horizontal and vertical protection angles. The part to implement the calculations has been developed as a Java applet which can run on any platform and let the users, in an interactive way, to get the results. This software makes possible that any Internet user can run the application from his/her own computer without having to compile of use sophisticated procedures as it happens with traditional languages. With this web site it is intended to cover the necessity of having simple and reliable means for architects and civil engineers to support the use of solar energy and the saving of energy in bioclimatic design of buildings. [Spanish] En este trabajo se presenta el desarrollo de un sitio interactivo visible en el World Wide Web (WWW) que pretende servir de apoyo para los calculos basicos de control de asoleamiento en viviendas y edificios. El sitio esta conformado por dos partes principales: una parte cubre el aspecto informativo, donde en forma sencilla y clara, se explican los conceptos y parametros necesarios para disenar los dispositivos de control, alerones y parteluces. La otra parte contiene los procedimientos y las rutinas de calculo para la determinacion de la posicion solar para cualquier fecha del ano desde cualquier punto sobre la tierra, asi como los angulos de sombreado vertical y horizontal. Para la realizacion de los calculos se ha construido un applet de Java, el cual puede ejecutarse desde cualquier plataforma de computacion y

  7. Energy saving plan: use of solar energy in the university of Valencia (Spain); Uso de la energia solar en la universidad de Valencia (Espana) para ahorrar energia electrica

    Gomez Gomez Amo, J.L.; Tena, F.; Martinez Lozano, J.A.; Utrillas, M.P. [Grupo de Radiacion Solar, Universidad de Valencia (Spain)

    2005-07-15

    The University of Valencia financed a pilot project that would study the installation's feasibility of a generating station with photovoltaic energy, solar type, in order to replace or complement conventional sources of energy. This paper presents some of the preliminary results of the study's application in an University building, along with the analysis of the initial situation and the proposals for the handling of reactive energy and the outer and inner lighting as solutions for energy saving. This experimental project entitled Study of the Energy Saving Strategies and the Viability of Installing Solar Energy equipment in the Buildings of the University of Valencia throws preliminary data specifying the amount of investment necessary to obtain real annual benefits, as well as the recovery time of the investment and the beneficial ecological impact in quantitative terms of a measurable CO{sub 2} reduction. [Spanish] La Universidad de Valencia financio un proyecto piloto que estudiaria la factibilidad de instalacion de una estacion generadora de energia fotovoltaica de tipo solar para sustituir o complementar fuentes convencionales de energia. Este trabajo presenta algunos de los resultados preliminares de la aplicacion del estudio en un edificio de la Universidad junto con el analisis de la situacion inicial y las propuestas del manejo de energia reactiva, de iluminacion exterior e interior como soluciones para el ahorro de energia. Este proyecto experimental titulado Estudio de las estrategias del ahorro de la energia y de la viabilidad de instalar energia solar en los edificios de la Universidad de Valencia arroja datos preliminares que especifican el monto de la inversion necesaria para obtener beneficios anuales reales, asi como el tiempo de recuperacion de la inversion y el impacto ecologico benefico en terminos cuantitativos de una reduccion cuantificable de CO{sub 2}.

  8. Hybrid system: Heat pump-solar air dryer for grains; Sistema hibrido: bomba de calor - calentador solar de aire para el secado de productos agricolas

    Soto Gomez, Willfredo [Instituto Tecnologico de Tijuana, Tijuana (Mexico); Ortega Herrera, Jose Angel [Instituto Politecnico Nacional, Mexico, D.F. (Mexico)

    2000-07-01

    Design, building, operation and evaluation energy wise of a hybrid experimental type, with heat pump, that uses no chloride, does not destroy the ozone layer. It is solar air dryer for grains. In this research we dry rice. It has tree systems: 1.- A mechanical compression heat pump, 2.- An air solar heater, and 3.- An agriculture products dryer. The drying capacity is 20 pounds of grain /day, with a median daily solar radiation. The costs is approximately U.S. $ 6 000.00. The heat pump used 22 refrigerant first, and now works with refrigerant SUVA 9000. This refrigerant will be available this year in the I.S., it is one of the ecological class that substitutes the chlorofluorocarbonates. [Spanish] Se disena, construye, opera, y evalua energeticamente, un sistema hibrido tipo experimental, con bomba de calor que utiliza refrigerante que no contiene cloro, y no destruye la capa de ozono y un calentador solar de aire, para secar granos. En este trabajo secamos arroz. Se compone de tres sistemas: 1.- Bomba de calor por compresion mecanica, 2.- Calentador solar de aire, 3.- Secador de productos agricolas. La capacidad de secado es de 10 Kilos de granos/dia promedio. Tiene un costo aproximado de $ 60 000. La bomba de calor utiliza refrigerante 22 en una primera generacion, y actualmente opera con un refrigerante SUVA 9000, en una segunda generacion, este refrigerante se comercializara en este ano, en la Union Americana, pertenece a la familia de los llamados refrigerantes ecologicos, sustitutos de los clorofluorocarbonados.

  9. Numerical procedure for estimating temperature in solarized soils Procedimento numérico para estimar temperaturas de solos solarizados

    Chigueru Tiba

    2006-03-01

    Full Text Available The objective of this work was to develop a simplified numerical procedure for the estimation of accumulated monthly hours of solarized soil temperatures. The proposed model requires monthly means of daily solar radiation and maximum air temperature as input data, and a daily pattern of temperature variation assumed to be sine-shaped. The procedure was verified using observations made during the years 1992 and 1993 in Jaguariúna, SP. The proposed procedure can predict monthly temperature hours at 10 cm depth in the solarized soil, with acceptable accuracy, in the region for which it was developed.O objetivo deste trabalho foi desenvolver um procedimento numérico simplificado para estimar as horas mensais acumuladas de temperaturas de solo solarizado. A modelagem proposta requer como dados de entrada as médias mensais de densidade de fluxo de radiação solar diária e temperatura máxima diária do ar, e um perfil diário de variação de temperatura, admitida como senoidal. O procedimento proposto foi verificado usando-se observações realizadas durante 1992 e 1993, em Jaguariúna, SP. A modelagem desenvolvida prediz as horas mensais de temperatura de solo solarizado, a 10 cm de profundidade, para a região em que foi desenvolvida.

  10. Application of a solar refrigeration system by absorption for the air conditioning of buildings

    Machielsen, Cees H. M [Delft University of Technology, Mekelweg (Netherlands); Hagendijk, Andre E [Consultancy and Research (Netherlands)

    2000-07-01

    This paper describes the Sofri project, a cooperation between Ceeran Ltd and The Delft University of Technology. The main objective of this project is to develop the necessary knowledge and experience to commercialize solar-assisted air conditioning and dehumidification systems in the Dutch Caribbean. The project is motivated by the present needs of the Dutch Caribbean for renewable energy sources and the fact that the Caribbean has a high and uniform insolation throughout the year. Furthermore, hotels and offices in this area use more than 40% of their energy for air-conditioning purposes. Therefore solar-assisted air conditioning systems are a logic approach in reducing the energy demand and to lower the peak electricity reducing the energy demands for the local power station. Ceeran Ltd has the objective to reach full commercialization of the proposed technologies in the Dutch Caribbean. The research is concentrated on liquid absorption machines and solar collection systems such as flat plates with selective surfaces, heat pipe evacuated tubes flat plate collectors, and Compound Parabolic Concentrators. The first demonstration unit is planned to be installed in an office building in Curacao. The installation consists of a 35 kW LiBr/H{sub 2}O absorption machine driven by 100 m{sup 2} flat pate collectors with a gas backup system. The system will provide comfort air-conditioning for this these type of office buildings during daytime. [Spanish] Este documento describe el proyecto SOFRI, una cooperacion entre Ceeran, Ltd, y la Universidad Tecnologica del Delft. El principal objetivo de este proyecto es el de desarrollar el conocimiento necesario y la experiencia para comercializar los sistemas de aire acondicionado y deshumidificacion ayudados por la energia solar en el Caribe Holandes. Este proyecto ha sido motivado por las actuales necesidades del Caribe Holandes de fuentes de energia renovable y por el hecho de que el Caribe tiene una alta y uniforme insolacion

  11. Solar radiation non-concentrated for the photovoltaic degradation of the pesticide; Aplicacion de la radiacion solar no concentrada para la degradacion fotocatalitica de plaguicidas

    Paredes, Alejandra; Gomez, Isela; Leal, Ma.Teresa; Gelover, Silvia; Bandala, Erick R [Instituto Mexicano de Tecnologia del Agua, Jiutepec, Morelos (Mexico)

    2000-07-01

    A study on the degradation of the pesticide Aldrin in the presence of titanium dioxide as a catalyst using non-concentrated solar light was carried out. The results show that the pesticide destruction follows a two phases kinetics, a fast one in the first four hours after the beginning of the solar light exposure, and a slow phase at longer periods of exposition. The final degradation rate is similar for any of the conditions tested in this study. Under the tested work conditions, the reduction on the concentration was always between 87 and 92%. The Aldrin degradation generated an increase on chloride ions concentration and a decrement of the pH of the solution. [Spanish] Se realizo el estudio de la degradacion del plaguicida Aldrin en presencia de dioxido de titanio utilizando luz solar no concentrada. Los resultados obtenidos muestran que la cinetica de desaparicion del plaguicida tiene dos fases, una rapida en las primeras 4 horas de exposicion a la luz solar y una mas lenta a tiempos mayores. El porcentaje final de degradacion es similar para todas las condiciones utilizadas en este estudio. Bajo las condiciones de trabajo probadas se observo una reduccion del nivel del plaguicida entre 87 y 92%. El seguimiento de la degradacion del plaguicida mostro un incremento en.

  12. Utilização de desperdícios (latas de refrigerante) na captação de Energia Solar para o aquecimento de ar

    Galvão, Constança

    2013-01-01

    Esta dissertação tem o intuito de apresentar um protótipo construído por Jorge Lourenço, em Olhão, Algarve, permitindo desta forma promover pistas para a criação de um novo produto vocacionado para o aproveitamento de Energia Solar Térmica para o aquecimento de ar. Assim, será analisado um painel solar que produz Energia Solar Térmica construído com latas de refrigerante e alguns materiais básicos de construção. Além de apresentar uma forma simples de se construir um Painel Solar Térmic...

  13. VALIDACIÓN Y CONFIABILIDAD DE UN SISTEMA AUTOMÁTICO BASADO EN COMPUTADORA PARA LA MONITORIZACIÓN DE LA IRRADIACIÓN SOLAR EN IQUITOS

    Arturo Díaz

    2011-12-01

    Full Text Available El presente estudio describe el desarrollo de un sistema automático basado en computadora para la monitorización de la irradiación solar. El objetivo principal fue complementar con esta monitorización un sistema integral para la vigilancia de la calidad del aire en la ciudad de Iquitos. Para lo cual se sistematizó un software elaborado para la adquisición, análisis y presentación de datos de modo numérico y gráfico, un módulo de amplificación y filtro RC para el tratamiento de las señales eléctricas y un solarímetro blanco y negro para registrar el fenómeno físico de la irradiación solar. La metodología consistió en elaborar cada parte del sistema, evaluar por separado cada componente, así como el sistema, validar y determinar su confiabilidad.  Realizamos el procedimiento habitual para la medición de la irradiación solar, el cual, se llevó a cabo en las instalaciones del Instituto de Investigación de la Universidad Nacional de la Amazonía Peruana.

  14. Procedimiento para el diseño de un sistema de calentamiento solar-mixto de aire que utiliza agua como fluido de trabajo

    Luis Francisco Boada E.

    2011-11-01

    Full Text Available En este artículo se describe un sistema solar-mixto de calefacción de aire que incorpora colectores planos calentadores del agua, un tanque acumulador de calor y un dispositivo para el intercambio de calor agua-aire. Se presentan los ensayos que determinaron la disposición óptima del equipo para el intercambio de calor con flujo de agua por termosifón y el comportamiento térmico para diferentes flujos de aire, así como los ensayos para conocer el comportamiento del sistema de calentamiento solar de agua. Finalmente, el diseño se efectúa mediante un programa de computador adaptado para tal fin.

  15. Evaluation of a integral systems greenhouse - solar dryer for small growers; Evaluacion de un sistema integral invernadero - secadero solar para pequenos productores

    Garcia, Victor O; Iriarte, Adolfo A [INENCO, Universidad Nacional de Catamarca, Catamarca (Argentina); Carabajal, Dante; Sabadzija, Gabriela; Tomalino, Luis [E.E.A. INTA, Catamarca, Catamarca (Argentina)

    2000-07-01

    sistema productivo, y en el verano se le acondiciona para cumplir las funciones de secadero solar. En la epoca invernal los cultivos evaluados fueron zapallito (Cucurbita maxima L), melon (Cucumis melo) y pepinillo (Cucumis sativus), determinandose ciclos de cultivo, periodo de cosecha y rendimiento en kg m{sup 2} para cada especie. La evaluacion del comportamiento como secador se realizo utilizando pimiento para pimenton (Capsicum annum). En este caso se analiza comportamiento termico del diseno, sistema de calefaccion auxiliar, comportamiento del producto durante el secado y calidad final del mismo. Se obtuvo un producto final de muy buena calidad tanto en color, sabor, aroma, con una clasificacion de calidad extra segun el Codigo Alimentario Argentino y la Norma ISO 7541. El tiempo de secado disminuyo notablemente respecto al secado a cielo abierto. La evaluacion economica se realizo para las campanas 1995, 1996, 1997, efectuandose posteriormente una evaluacion financiera de la inversion para un periodo de cinco anos obteniendose un VAN positivo y un TIR superior al costo de la mejor alternativa de uso del dinero. El sistema integrado es una alternativa valida en el marco de una produccion sustentable productiva para pequenos productores.

  16. Instalación solar de suministro de energía para la Mezquita de Playa Blanca (Lanzarote)

    Agirat, El Bachir

    2014-01-01

    El presente trabajo tiene como objetivo el estudio para realizar una instalación eléctrica mediante el uso de energías renovables, en una Mezquita, situada en la isla de Lanzarote. En este trabajo se ha optado por realizar una instalación solar fotovoltaica aislada de red sobre cubierta. A continuación se ha procedido a realizar un pre-dimensionado de la instalación, con el fin de contemplar la viabilidad del proyecto. Posteriormente, se ha realizado el dimensionado definitivo ...

  17. Procedimiento para el diseño de un sistema de calentamiento solar-mixto de aire que utiliza agua como fluido de trabajo

    Luis Francisco Boada E.; Carlos Alfonso Rodríguez A.; Luz Marina Salazar L.

    2011-01-01

    En este artículo se describe un sistema solar-mixto de calefacción de aire que incorpora colectores planos calentadores del agua, un tanque acumulador de calor y un dispositivo para el intercambio de calor agua-aire. Se presentan los ensayos que determinaron la disposición óptima del equipo para el intercambio de calor con flujo de agua por termosifón y el comportamiento térmico para diferentes flujos de aire, así como los ensayos para conocer el comportamiento del sistema de calentamiento so...

  18. Method to allow the estimation of heat transfer coefficients in solar stills; Metodo para determinar coeficientes locales de transferencia de calor en destiladores solares

    Rubio Cerda, Eduardo; Porta Gandara, Miguel A [CIBNOR, Mexico D.F (Mexico); Fernandez Zayas, Jose Luis [UNAM Mexico, D.F. (Mexico)

    2000-07-01

    This work reports an experimental method that allows to estimate the heat transfer coefficients in the neighborhood of walls or flat plates subject to convective transport phenomena. This method can be applied to a great variety of thermal systems since it is based on the knowledge of the border condition for the temperature at the surface of the plate, and the temperature profile that characterize the dimensionless coefficient of heat transfer in the fluid, according to its definition given by the Nusselt number. The approach of this work are the foundations of the method and the system that has been developed to apply it, that incorporates automatic acquisition equipment for continuos monitoring of the information and elements to control the parameters of interest. In addition, the experimental cavities on which the method will be evaluated are discussed, considering two different scales, as well as experiments in cavities filled with air, and with a mixture of air and steam water, as is the case for solar distillation. [Spanish] En este trabajo se presenta un metodo que permite determinar de manera experimental coeficientes de transferencia de calor por conveccion. Este metodo puede ser aplicado a una gran variedad de sistemas termicos ya que se fundamenta en el conocimiento de la condicion de frontera para la temperatura en la superficie de la placa, y del perfil de temperaturas que caracteriza el coeficiente adimensional de transferencia de calor en el fluido, de acuerdo a la definicion de este, dada por el numero de Nusselt. El trabajo que aqui se reporta esta enfocado a la fundamentacion del metodo y al equipamiento que se ha desarrollado para instrumentarlo, que incorpora equipos automaticos de adquisicion continua de informacion y elementos de control para los parametros de interes. Se presentan ademas, las cavidades experimentales sobre las que sera evaluado el metodo, que considera dos escalas diferentes, asi como experimentos en cavidades llenas de aire

  19. Analysis of efficiency of a solar dryer tunnel type of mango pulp; Analisis de la eficiencia de un secador solar tipo tunel para pulpa de mango

    Chagoyan Serrano, Jose [Universidad Autonoma de Baja California Sur, La Paz, Baja California Sur (Mexico)

    2000-07-01

    A new method to assess the performance of a solar dryer is presented. It describes energy efficiency indicators to improve a commercial dryer design. First, a preliminary dryer design procedure is described step by step. Then, two different modes of a tunnel dryer are investigated: Batch and semi-continue operations. The results of the analysis show that, the thermal efficiency is not sufficient to rate de dryer performance. It is necessary to include the productivity of the drying process and the quality of the dried fruit. The drying process and productivity tend to go hand-in-hand but in opposite directions. That is to say, raising the thermal efficiency reduce the process productivity and conversely. The analysis also suggests that an agreement between the efficiency, productivity and the quality must be specified in the drier design. [Spanish] Se presenta un procedimiento nuevo para evaluar la operacion de un secador solar, con el cual se precisan indicadores de la eficiencia que pueden ser utiles para mejorar el diseno del equipo. Se empieza por describir los pasos de un procedimiento de diseno preliminar de un sistema de secado. Despues, se analizan cualitativamente dos secadores: uno que opera por lotes y el otro de modo semicontinuo. Los resultados del analisis muestran que, la eficiencia termica del equipo no es un criterio suficiente para evaluar su operacion; tambien se requiere tomar encuenta la productividad del proceso de secado y la calidad del producto final. Se concluye que la eficiencia termica y la productividad del proceso son conceptos encontrados. Es decir, la eficiencia termica del equipo no es un criterio suficiente para evaluar su operacion; tambien se requiere tomar en cuenta la productividad del proceso de secado y la calidad del producto final. Se concluye que la eficiencia termica y la productividad del proceso son conceptos encontrados. Es decir, la eficiencia termica solo se puede aumentar a costa de la productividad y viceversa

  20. Desarrollo de métodos analíticos para el control de filtros UV de naturaleza orgánica en productos cosméticos para la protección solar.

    Chisvert Sanía, Alberto

    2003-01-01

    RESUMEN El actual deterioro de la capa de ozono ha provocado un incremento de la radiación UV solar que llega a la Tierra, que hace necesaria una mayor protección con el fin de evitar efectos perjudiciales para la salud. El uso de productos cosméticos para la protección solar que incorporan filtros UV en su formulación podría contribuir a prevenir estos efectos dañinos. El control analítico de estos productos es necesario, ya que debe garantizarse su eficacia y seguridad....

  1. Use of refraction to increase the efficiency of solar panels; Uso de la refraccion para el incremento de la eficiencia en paneles solares

    Martinez Patino, J [Universidad de Guanajuato, Campus Irapuato-Salamanca, Salamanca, Guanajuato (Mexico)]. E-mail: jesusmp23@ugto.mx; Hernandez Figueroa, M. A; Lozano Garcia, J.M; Ireta Moreno, F; Rubio Maya, C [Universidad Michoacana de San Nicolas de Hidalgo Morelia, Michoacan (Mexico)]. E-mails: mahf@ugto.mx; jm.lozano@ugto.mx; fireta@ugto.mx; rmaya@umich.mx

    2013-03-15

    abriendo nuevas oportunidades para investigar de manera mas profunda las caracteristicas termicas y de humedad de los paneles solares en funcion de su eficiencia y de los materiales que intervienen en el diseno del mismo.

  2. Destilador solar destinado a fornecer água potável para as famílias de agricultores de base familiar.

    Marinho, Francisco José Loureiro; Tavares, Adriana Carneiro; Santos, Shirleyde Alves dos; Marcovicz, Fabian; Cruz, Marcelo Pereira; Souto, Erinaldo Almeida; Rocha, Elizabete Nunes da

    2012-01-01

    Com o objetivo de fornecer água potável aos agricultores do Semiárido do Nordeste Brasileiro, estudou-se a viabilidade técnica de um destilador solar no processo de dessalinização de água para consumo humano constituído de um coletor solar para aquecimento de água salina. Foram avalizados dois métodos de condução do fluxo de água do coletor solar para o tanque de evaporação. No Método 1 (M1) o fluxo de água foi constante (1L h-1), mantendo-se um lâmina de 10mm no interior da caixa de alvenari...

  3. Web application for information and solar monitorized facilities management; Aplicacion WEB para la gestion de informacion e instalaciones solares monitorizadas

    Lopez, G.; Jurado, F. M.

    2004-07-01

    The Society for Energy Development of Andalusian has developed a computer tool based on Internet. This tool consists of a centralized system for the acquisition, storage and processing of data obtained from monitorized solar systems. This computer tool allows the user to obtain several reports, which are prepared automatically and show both technical and economical information. For instance, this tool could be used by the companies aimed to the Thermal Energy sale business. This paper shows both the characteristics of this computer tool and the results obtained from its different utilities. (Author)

  4. Notes for a procedure of certification of thermal solar facilities; Apuntes para un procedimiento de certificacion de instalaciones solares termicas

    Prieto, J. I.; Garcia, D.

    2008-07-01

    A procedure to evaluate the quality of solar thermal installations is proposed, following some analogy to the Calificacion Energetica de Viviendas (C.E.V.) method. The steps required to develop the method are established, analysing with special detail the stage of design-based qualification. The proposed procedures of energy saving qualification, architectural qualification, and economical qualification, are justified. Moreover, the report suggests a list of previous data that must be provided and periodically updated by the Administration to guarantee both the objectivity and the transparency of the qualification procedure. The exposure of the method is complemented with numerical and graphical application to several case studies. (Author)

  5. ParaSol - A Novel Deployable Approach for Very Large Ultra-lightweight Solar Arrays Project

    National Aeronautics and Space Administration — High power solar arrays with capabilities of >100kW are needed for projected NASA missions. Photovoltaic arrays using deployable membranes with thin cells have...

  6. Iluminación con Energía Solar Fotovoltaica para Autoservicios en Bogotá

    Wilmar Giovani Santamaría

    2015-07-01

    Full Text Available Este artículo presenta un estudio técnico y económico sobre el uso de energía fotovoltaica para iluminación en dos (2 autoservicios en la ciudad de Bogotá. Se analizan diferentes aspectos a tener en cuenta, como la radiación solar mínima sobre el área considerada y los consumos en iluminación con energía convencional. Se estima que, al realizar el cambio de iluminación de bombillos fluorescentes a bombillos LED y establecer como fuente primaria las baterías previamente alimentadas con energía fotovoltaica, se reduce el consumo de energía eléctrica de manera considerable en iluminación. Con esta hipótesis, se plantean tres opciones de sistemas fotovoltaicos autónomos para cada uno de los autoservicios con todos los elementos necesarios para el mejor funcionamiento, el estudio económico de cada opción y un estimativo del ahorro energético.

  7. Actuaciones de un colector solar de aire para secado de productos agrícolas en países en vías de desarrollo

    Esteban Biescas, Sandra

    2015-01-01

    El uso de secaderos solares para el secado de productos agrícolas es una de las tecnologías apropiadas en crecimiento en los países en vías de desarrollo. En el marco de las tecnologías apropiadas se define el presente Trabajo Fin de Grado para caracterizar el proceso de calentamiento de aire y la capacidad de secado de un secadero solar activo (de convección forzada) de tipo distribuido protegiendo así al máximo los productos agrícolas de los agentes externos. Este sistema se basa en el a...

  8. Célula solares de silicio para alta concentración: industrialización y células de contacto posterior

    Castro Delgado, Marisa

    2009-01-01

    El objetivo de esta tesis es el desarrollo de células de silicio para sistemas de concentración fotovoltaica. El punto de partida fue la confluencia de varios factores, incluyendo la existencia de una tecnología madura de concentración, con numerosos prototipos instalados pero sin presencia en el mercado y con una total escasez de células solares adecuadas a ellos, junto a una tecnología de células de silicio de alta eficiencia probada con éxito en el Instituto de Energía Solar para concentra...

  9. Diseño y optimización de una instalación solar para la obtención de agua caliente sanitaria

    Campos Díez, Sergio

    2010-01-01

    El objetivo del presente proyecto consiste en la instalación de un sistema de captación solar para la producción de agua caliente sanitaria (ACS) en viviendas unifamiliares en la Comunidad de Madrid, evitando la emisión de grandes cantidades de gases de efecto invernadero. El proyecto se ha dividido en 16 capítulos que detallan el proceso de análisis aplicado para lograr la optimización de la instalación solar que se propone. El capítulo 1, dentro del cuál nos encontramos, t...

  10. Estudio de la variación solar quieta para el observatorio geomagnético de Fúquene

    Ladino Parra Rosa Angélica

    2001-08-01

    ="margin-bottom: 0.0001pt;">El estudio realizado comprende el cálculo y análisis de la variación solar quieta (Sq, para el Observatorio Geomagnético de Fuquene a partir de las tres (3 componentes del campo magnético terrestre (CMT: declinación (D, componente horizontal (H y componente vertical (2; de los cinco (5 días internacionalmente quietos de cada mes. El período considerado esta entre octubre de 1953 y diciembre de 1994.

    La metodología desarrollada se basa en el análisis individual de cada día quieta mediante la aplicación de una correcci6n por variación no cíclica (CVNC y su reducción a un valor medio cero, realizando el respectivo análisis armónico hasta el grado 4. Posteriormente se aplicó la corrección por achatamiento y se reagrupó la información en tres niveles de actividad solar: alta, media y baja (en función del número de manchas solares; para cada una de ellas se promediaron los armónicos por mes calendario, permitiendo un análisis de la modulación estacional fundamentada en el criterio de promediación de resultados de los meses (solsticio de verano: mayo - junio - julio - agosto; equinoccio: marzo - abril - septiembre - octubre; solsticio de invierno: noviembre - diciembre - enero - febrero. Como validación, se realizaron comparaciones con el modelo de Wallace Campbell, estableciéndose la diferencia de este modelo teórico con la modelación solar para la misma selección de días. A partir de las comparaciones realizadas entre el modelo te6rico y el observado se obtuvo el máximo y mínimo valor de Sq. Los resultados obtenidos son de utilidad para el mejoramiento de los modelos globales de variaciones regulares, variación solar quieta (Sq y modelo del campo geomagnético internacional de referencia (lGRF. Adicionalmente facilita la determinación de modelos de propagación ionosférica y

  11. Tratamento térmico solar da água para controle de fitopatógenos Solar heating of water for controlling phytopathogenic microorganisms

    Maria Aparecida S. Tanaka

    2003-08-01

    Full Text Available Alguns microrganismos fitopatogênicos podem ser transportados pela água, que se constitui em importante e eficiente forma de disseminação. O controle de fitopatógenos pelo tratamento térmico da água infestada, utilizando a energia solar, constituiu o objetivo do trabalho. Quantificou-se a eficiência de um sistema automatizado de aquecimento solar desenvolvido para esta finalidade, baseado em processo misto de aquecimento da água em circuito fechado, com coletores planos e transmissão de calor por convecção natural e forçada. A automatização e a equalização da temperatura foram obtidas por termostatos localizados em diferentes pontos. Verificou-se boa eficiência do equipamento, trabalhando na temperatura de 60 ºC, tanto em rendimento de água processada como na eliminação do inóculo de fitopatógenos de importância econômica, como Botrytis cinerea, Colletotrichum spp., Fusarium spp., Pythium spp., Verticillium dahliae e Rhizoctonia solani. À exceção de F. oxysporum f. sp. phaseoli, os patógenos testados não sobreviveram ao tratamento térmico a temperaturas acima de 55 0C. A técnica mostrou-se promissora como uma opção na desinfestação da água para uso em irrigação de viveiros, casas de vegetação e diversas finalidades em pequenas ou médias propriedades agrícolas.Some phytopathogenic microorganisms may be transmitted by water representing an efficient means way of inoculum dissemination. The objective of the work was to quantify the efficiency of thermal treatment by solar heating in the control of pathogens in contaminated water. The equipment developed for this purpose was composed of flat collectors and used both natural and forced convection to transfer heat to the circulating water. Thermostats, placed in different locataions, automatically equalized the temperature of the system. The equipment was verified to peform well at 60 ºC, in terms of water processed as well as in the eradication of

  12. Cálculo de las instalaciones para un parque solar fotovoltaico

    Barreiro Falcón, Adrián

    2011-01-01

    El presente proyecto tiene por objeto llevar a cabo el diseño de una cubierta solar fotovoltaica conectada a la red eléctrica e integrada en las marquesinas del aparcamiento del aeropuerto de Gran Canaria. El fin perseguido es diseñar una cubierta solar fotovoltaica que genere el máximo de energía eléctrica posible con objeto de volcarla a la Red Eléctrica y obtener el consecuente beneficio económico por su venta tal y como establece el RD 6/2009, en el que se definen las condiciones de explo...

  13. Application of scale test modules for model the electrothermal performance in buildings for the efficient use of energy; Aplicacion de modulos de prueba a escala para modelar el funcionamiento electrotermico de edificios para el uso eficiente de la energia

    Acoltzi Acoltzi, Higinio

    2000-10-01

    and small vault pottery with glass sun reflector (34% in the experimental model and 37% in the theoretical model). [Spanish] La investigacion para acondicionamiento de espacios por enfriamiento en edificios de tamano real tiene un costo elevado por la cantidad de materiales y la variedad de parametros que intervienen. Por lo anterior, en este trabajo se utilizan modulos de prueba a escala acoplados a sistemas de aire acondicionado para obtener su respuesta electrotermica; es decir, cuantificar la cantidad de energia electrica que consumira un modulo en funcion de los materiales de prueba. Se analiza un modelo termico teorico transitorio y las pruebas experimentales del comportamiento termico de modulos de prueba a escala por la variacion de los materiales de los techos y ventanas, desarrollado con el objeto de establecer criterios de aplicacion de dichos materiales en las industrias de la edificacion. Adicionalmente se presenta el desarrollo de un modelo electrotermico teorico en estado permanente, que define el comportamiento del consumo de energia electrica, para mantener las condiciones de confort al interior de los modulos de prueba respecto a la variacion de los materiales mencionados. Se presenta tambien el diseno y el desarrollo de las pruebas experimentales utilizando los modulos de prueba a escala para validar el modelo electrotermico. La experimentacion se desarrolla exponiendo los modulos de prueba a escala, acoplados a los equipos de aire acondicionado, a la radiacion solar directa, registrando el consumo de energia electrica de los equipos de aire acondicionado, la radiacion solar sobre techo y ventanas de prueba, la temperatura interior de los modulos, la temperatura interior y exterior en la superficie de los techos de prueba, la temperatura ambiente, y la velocidad del viento. Los resultados obtenidos comparando las mediciones en campo y el modelo electrotermico teorico desarrollado, presentan diferencias promedio de 16%. Los ahorros de energia

  14. VALIDACIÓN Y CONFIABILIDAD DE UN SISTEMA AUTOMÁTICO BASADO EN COMPUTADORA PARA LA MONITORIZACIÓN DE LA IRRADIACIÓN SOLAR EN IQUITOS

    Arturo Díaz; Manuel Velásquez; Carlos Araujo

    2011-01-01

    El presente estudio describe el desarrollo de un sistema automático basado en computadora para la monitorización de la irradiación solar. El objetivo principal fue complementar con esta monitorización un sistema integral para la vigilancia de la calidad del aire en la ciudad de Iquitos. Para lo cual se sistematizó un software elaborado para la adquisición, análisis y presentación de datos de modo numérico y gráfico, un módulo de amplificación y filtro RC para el tratamiento de las señales elé...

  15. Iluminación con Energía Solar Fotovoltaica para Autoservicios en Bogotá

    Wilmar Giovani Santamaría; Janett Barbosa-Urbano; Manuel Alejandro Mayorga; David Marcelo García-Reyes

    2015-01-01

    Este artículo presenta un estudio técnico y económico sobre el uso de energía fotovoltaica para iluminación en dos (2) autoservicios en la ciudad de Bogotá. Se analizan diferentes aspectos a tener en cuenta, como la radiación solar mínima sobre el área considerada y los consumos en iluminación con energía convencional. Se estima que, al realizar el cambio de iluminación de bombillos fluorescentes a bombillos LED y establecer como fuente primaria las baterías previamente alimentadas con energí...

  16. Proyecto de instalación solar para ACS, calefacción y piscina en un edificio de viviendas

    Relaño Peña, Antonio Luis

    2010-01-01

    Con arreglo al nuevo Código Técnico de la Edificación, en el que se establece unos niveles mínimos de contribución solar para ACS en los edificios de nueva construcción y rehabilitación, por el interés por las energías renovables y la eficiencia energética el alumno ha realizado el siguiente proyecto. En este proyecto se ha pretendido realizar un diseño de la instalación que sea por una parte lo más eficiente posible desde el punto de vista energético y por otra parte que su utilización sea l...

  17. Influencia de los materiales cerámicos en colecto - res solares de placa plana para precalentamiento de agua en procesos agroindustriales

    Leonardo Alonso

    2015-12-01

    Full Text Available El uso de materiales cerámicos en colectores para uso de energía solar térmica se ha incrementado últimamente. Se determinaron las diferencias presentadas entre diferentes cerámicas fabricadas a 3626 y 5222 psi instaladas en dos colectores de área efectiva de 0,36 m 2. El objetivo este tipo de colectores es lograr eficiencia energética para empresas agroindustriales que usan agua a temperatura cercana a su punto de ebullición a presión atmosférica. El colector está constituido por una matriz de cerámica que cumple la función de absorber la energía solar y un contenedor de acero inoxidable aislado donde el agua es almacenada. Los experimentos fueron a nivel de laboratorio a 400, 500, y 750 W/m 2 en un simulador de radiación solar. Un completo análisis desde la perspectiva va de la segunda y la primera ley de la termodinámica fue hecho para calcular la eficiencia del colector solar. Los resultados mostraron que la eficiencia global del colector solar de matriz cerámica fue de 59 % a 400 W/m 2 con cerámica compactada a 5222 psi.

  18. Estudio preliminar de tres modelos de destiladores solares para producir sal y agua potable (ING

    Shyam S. Nandwani

    2016-03-01

    Full Text Available We have constructed three solar stills of areas 0.5-1.0 m2 to produce salt and potable water, using local technology and local materials. We have studied the thermal efficiency of these stills as a function of solar intensity, covers, geometrical configuration, quantity of water, salt concentration and artificial cooling of the cover. Some of the important results are: still with glass cover destill more water than still with plastic cover, thermal efficiency vary between 10-30%, amount of water which can be evaporated and condense is 2-4 l/day/m2, exist 25-60% of loss of water in the still and finally artificial cooling of the cover can be accelerate the process of condensation, etc. Finally we have mentioned the chemical analysis of destilled and normal tap water.

  19. Energía solar para propulsión de embarcaciones fluviales

    Salas, Marcos; Luco, Richard; Ekdahl, Hans

    2013-01-01

    This paper shows current available options in propulsion of small crafts using an electric engine getting energy from a battery bank. Batteries can be recharged by means of a fixed electric network or through photovoltaic panels disposed onboard, normally on a flat roof or deck. An operational analysis is included, taking into account the advantages and limitations of this propulsion arrangement, moreover, referential prices of fixed grid electricity are quoted and compared to solar panels an...

  20. Irreversibility analysis of non isothermal flat plate solar collectors for air heating with a dimensionless model; Analisis de las irreversibilidades en colectores solares de placas planas no isotermicos para calentamiento de aire utilizando un modelo adimensional

    Bracamonte-Baran, Johane Hans; Baritto-Loreto, Miguel Leonardo [Universidad Central de Venezuela (Venezuela)]. E-mails: johanehb@gmail.com; johane.bracamonte@ucv.ve; miguel.baritto@ucv.ve

    2013-04-15

    The dimensionless model developed and validated by Baritto and Bracamonte (2012) for the thermal behavior of flat plate solar collector without glass cover is improved by adding the entropy balance equation in a dimensionless form. The model is solved for a wide range of aspect ratios and mass flow numbers. A parametric study is developed and the distribution of internal irreversibilities along the collector is analyzed. The influence of the design parameters on the entropy generation by fluid friction and heat transfer is analyzed and it is found that for certain combinations of these parameters optimal thermodynamic operation can be achieved. [Spanish] En el presente trabajo, el modelo adimensional desarrollado y validado por Baritto y Bracamonte (2012) para describir el comportamiento termico de colectores solares de placas planas sin cubierta transparente, se complementa con la ecuacion adimensional de balance de entropia para un elemento diferencial de colector solar. El modelo se resuelve para un amplio rango de valores de relaciones de aspecto y numero de flujo de masa. A partir de los resultados del modelo se desarrolla un analisis detallado de la influencia de estos parametros sobre la distribucion de irreversibilidades internas a lo largo del colector. Adicionalmente se estudia la influencia de estos parametros sobre los numeros de generacion de entropia por friccion viscosa, por transferencia de calor y total. Se encuentra que existen combinaciones de los parametros antes mencionados, para los cuales, la operacion del colector es termodinamicamente optima para numeros de flujo de masa elevados.

  1. Análise de um sistema de aquecimento de água para residências rurais, utilizando energia solar A water heating system analysis for rural residences, using solar energy

    Luiz H. Basso

    2010-02-01

    Full Text Available A conscientização da importância do meio ambiente tem incentivado o estudo de novas fontes energéticas renováveis e menos poluentes. Dentre essas fontes, a energia solar destaca-se por ser perene e limpa. A utilização da energia solar em sistemas de aquecimento de água residencial rural pode colaborar com a economia de energia elétrica, base da matriz energética brasileira. Conhecer os fatores que influenciam na operação de um sistema de aquecimento de água por energia solar é importante na determinação de sua viabilidade técnica, visando a sua difusão em residências rurais. Para tanto, construiu-se um protótipo, no câmpus da Faculdade Assis Gurgacz, em Cascavel - PR, com características similares a um equipamento utilizado em residências para dois habitantes, para funcionar com circulação natural ou termossifão e sem auxílio de sistema de aquecimento complementar. O equipamento mostrou-se viável tecnicamente, alcançando a temperatura mínima para banho de 35 °C, sempre que a radiação solar foi superior a 3.500 Wh m-2, o que aconteceu para a maioria dos dias estudados.The awareness of the importance of the environment has stimulated the study of new renewed energy sources and less pollutant. Amongst these sources, solar energy stands alone for being perennial and clean. The use of solar energy in systems of agricultural residential water heating, can complement the economy of electric energy, base of the Brazilian energy matrix. Knowing the factors that influence the operation of a system of water heating by solar energy is important in determining their technical viabilities targeting their distribution in agricultural residences. To evaluate equipment of water heating for solar energy, a prototype was constructed in the campus of Assis Gurgacz College, in Cascavel,State of Paraná, Brazil, with similar characteristics to equipment used in residences for two inhabitants, to function with natural circulation or

  2. Banco de ensayos para el control de calidad de paneles solares fotovoltaicos

    Domingo Escudero, Andrés

    2013-01-01

    El objetivo principal del presente Proyecto Fin de Carrera es el de dotar a la Escuela Universitaria de Ingenieros Técnicos de Telecomunicación – Universidad Politécnica de Madrid (EUITT-UPM) de un banco de medida donde poder caracterizar los módulos fotovoltaicos en condiciones reales de operación. Es necesario comprobar el funcionamiento de los módulos para asegurarse de que está acorde a lo indicado en las especificaciones anunciadas por los fabricantes. A lo largo del texto daremos ...

  3. Study of a hybrid solar-electric oven to the curing composite materials used in aeronautics; Estudio de un horno hibrido solar-electrico para el curado de materiales compuestos utilizados en aeronautica

    Hernandez Roman, M. A.; Pineda Pinon, J.; Sanchez Sanchez, A. [CICATA - Unidad Queretaro, Santiago de Queretaro, Queretaro (Mexico)]. E-mail: mhernandezr0900@ipn.mx

    2010-11-15

    The study covers the curing of advanced composites in a hybrid solar electric oven. The furnace uses electricity from the grid power and solar energy provided by the heliostat concentrator system. The materials used in the experiments will be composite materials such as prepreg. The prepreg are fiberglass and carbon fiber. The resin used in the pre-impregnate will be epoxy resin. The work temperatures inside the furnace will be maximum 300 degrees Celsius. The obtained results will be useful to characterize the use of the solar energy and the characterize of the curing chamber. [Spanish] Se presenta el alcance para el estudio, el cual abarca el curado de materiales compuestos avanzados dentro de un horno hibrido solar electrico. El horno utilizara energia electrica suministrada por la red y energia solar suministrada por el sistema heliostato concentrador. Los materiales utilizados en los experimentos seran materiales compuestos tipo prepreg. Los prepreg seran de fibra de vidrio y de fibra de carbono. La resina utilizada en el preimpregando sera resina epoxica. Las temperaturas de trabajo dentro del horno seran como maximo de 300 grados centigrados. Los resultados obtenidos serviran para caracterizar el uso y aprovechamiento de la energia solar y la caracterizacion de la camara de curado.

  4. Sistema de calefacción para unifamiliar mediante energías renovables (solar, biomasa y geotérmica)

    Úriz Larrea, Aitor

    2010-01-01

    Este proyecto fin de carrera tiene como objeto el diseñar y valorar la instalación de calefacción y agua caliente sanitaria a instalar en una vivienda unifamiliar adosada, situada en Artajona (Navarra), utilizando para ello estas energías renovables: solar térmica (con apoyo de caldera de gasoil), biomasa y bomba de calor geotérmica. Se proyectará la instalación para cada tipo de las energías mencionadas y se mostrarán las ventajas y desventajas de cada una.

  5. Modelo para calibrar piranómetro con la referencia mundial de radiación solar, utilizando un piranómetro con banda de sombra

    Edisson Paguatian Tutistar

    2014-01-01

    El presente artículo hace referencia al trabajo desarrollado en torno a la calibración de instrumentos radiométricos, utilizando los datos climatológicos de radiación solar difusa, humedad relativa, punto de rocío, temperatura, ozono estratosférico, presión atmosférica local y constante solar, para días despejados seleccionados en la ciudad de Bogotá, mediante la metodología desarrollada de un modelo matemático que permita la calibración de radiómetros sensibles a la radiación ab...

  6. Utilização de sistemas fototérmicos com concentradores para higienização de salas de ordenha Use of the thermal solar systems with concentrators for the hygiene of milking parlor

    Leandra Altoé; Delly Oliveira Filho

    2010-01-01

    Neste trabalho, analisou-se a viabilidade do uso de concentradores de radiação solar em sistemas fototérmicos para higienização de salas de ordenha. Foram analisadas três opções para aquecimento de água com reservatório de acumulação: sistema com resistência elétrica, sistema solar com concentrador e sistema solar sem concentrador. Calculou-se o custo total dessas alternativas e o valor presente líquido do sistema solar suplementado por lenha de eucalipto comprada, lenha de eucalipto produzid...

  7. Métodos para estimar radiação solar na região noroeste de Minas Gerais Methods for estimating solar radiation in the northwest region of Minas Gerais

    Valdiney José da Silva

    2012-02-01

    Full Text Available A radiação solar é um dos elementos responsáveis pela manutenção da vida no planeta. Apesar da sua importância, o registro da radiação solar não é feito na maioria das estações meteorológicas convencionais, uma vez que nem todas dispõem de equipamentos para medi-la, tendo que recorrer a métodos de estimação empíricos. Com o intuito de testar e calibrar equações para estimar a radiação solar, foram coletados dados de quatro estações meteorológicas pertencentes ao Instituto Nacional de Meteorologia (INMET para representar a região climática noroeste de Minas Gerais, no período de 2008 a 2010. Com base nesses dados, foram testados e calibrados nove modelos para estimar a radiação solar global. Todos os modelos utilizam temperatura máxima e mínima do ar como preditores e dois deles utilizam também a precipitação pluviométrica. Os modelos mais precisos foram de De Jong e Stewart, Bristow e Campbell, Donatelli e Campbell e o modelo dois de Hunt, com raiz quadrada do quadrado médio do erro em torno de 3,1MJ m-2 d-1 e coeficiente de determinação em torno de 62%. No entanto, todos esses modelos apresentaram tendência de superestimação para valores de radiação inferiores à média e subestimação para valores superiores. Portanto, há necessidade de propor novos modelos que minimizem essa tendência.Solar radiation is a component responsible for maintaining the life on the planet. Despite its importance, solar radiation is not recorded in most conventional meteorological station since not all have equipments to measure it, and then, it is usual to use empirical solar radiation estimation methods. In order to test and calibrate models for estimating solar radiation data were collected from four meteorological stations belonging to the National Institute of Meteorology (INMET to represent the climatic region northwest of Minas Gerais for the period from 2008 to 2010. Based on these data, nine models to estimate

  8. Conocimientos y prácticas frente a la exposición solar y tamizaje de cáncer de piel. Medellín, mayo - junio de 2000

    Marta Gaviria

    2001-04-01

    Full Text Available

    El melanoma maligno cutáneo ha mostrado en las últimas décadas un aumento en su incidencia; para 1992 ésta fue de 1:105, ientras que para el año 2000 se esperaba una incidencia de 1:75. Aunque estudios epidemiológicos internacionales evidencian que la exposición a la radiación solar constituye la principal causa de melanoma en poblaciones de piel blanca, la distribución de éste por sitio corporal o está estrechamente relacionada con las áreas de máxima exposición sino que compromete áreas intermitentemente expuestas. Para que se desarrolle el cáncer de piel se requiere una combinación de factores constitucionales y ambientales. Entre las características
    fenotípicas se encuentran: el color claro de la piel, la incapacidad para broncearse, cabello de color rojo o amarillo y la presencia de efélides en la infancia. En cuanto a los factores ambientales, la depleción de la capa de ozono por los clorofluorocarbonos liberados hacia la atmósfera por los envases de aerosol, los aires acondicionados y los
    refrigeradores, puede aumentar la cantidad de radiación ultravioleta ue alcanza la superficie terrestre incrementando la incidencia de estos tumores. en personas con trabajos al aire libre y alta exposición recreativa al sol; en dichas personas se encuentra una mayor incidencia de cáncer de piel, disminuyendo progresivamente la edad de aparición de esta enfermedad.

     

     

  9. Analysis of passive systems as a tool for energy saving in buildings: solar control; Analisis de sistemas pasivos como herramienta para el ahorro de energia en edificaciones: Control solar

    Saravia, Maricela; Morillon Galvez, David [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1999-07-01

    A bioclimatic study of El Salvador is presented, with the purpose of using window eaves as elements of passive solar control and to determine the optimal angles of orientation, in order to diminish the thermal gains by direct solar radiation and to manage to get close to the comfort conditions. The former with the intention of integrating measures that help to obtain energy efficiency and comfortable buildings, for the conditions of warm humid climate, characteristic of a Central American country like El Salvador. Besides offering a document of consultation among the professionals dedicated to the design and as base of bioclimatic considerations that must have the construction regulations. As a conclusion the optimal angles of eaves for each orientation are presented and a quantitative estimation of the savings that would imply not to consume electrical energy in cooling systems using these elements as a protection to the direct solar radiation. [Spanish] Se presenta un estudio del bioclima de El Salvador, con el fin de utilizar aleros de ventana como elementos de control solar pasivo y determinar los angulos optimos por orientacion, para disminuir las ganancias termicas por radiacion solar directa y lograr acercar a las condiciones de confort. Lo anterior con el objeto de integrar medidas que coadyuven a lograr edificios energeticamente eficientes y confortables, para las condiciones de clima calido humedo, caracteristico de un pais centroamericano como El Salvador. Ademas de brindar un documento de consulta entre los profesionales dedicados al dise y como base de consideraciones bioclimaticas que debe tener el reglamento de construcciones. Como conclusion se presentan los angulos optimos de alero por cada orientacion y una estimacion cuantitativa del ahorro que implicaria el no consumir energia electrica en sistemas de enfriamiento utilizando estos elementos como una proteccion a la radiacion solar directa.

  10. Comparison of Regression and Neural Networks Models to Estimate Solar Radiation Comparación de Regresión y Modelos de Redes Neuronales para Estimar la Radiación Solar

    Mónica Bocco

    2010-09-01

    Full Text Available The incident solar radiation on soil is an important variable used in agricultural applications; it is also relevant in hydrology, meteorology and soil physics, among others. To estimate this variable, empirical models have been developed using several parameters and, recently, prognostic and prediction models based on artificial intelligence techniques such as neural networks. The aim of this work was to develop linear models and neural networks, multilayer perceptron, to estimate daily global solar radiation and compare their efficiency in its application to a region of the Province of Salta, Argentina. Relative sunshine duration, maximum and minimum temperature, rainfall, binary rainfall and extraterrestrial solar radiation data for the period 1996-2002, were used. All data were supplied by Experimental Station Salta, Instituto Nacional de Tecnología Agropecuaria (INTA, Argentina. For both, neural networks models and linear regressions, three alternative combinations of meteorological parameters were considered. Good results with both prediction methods were obtained, with root mean square error (RMSE values between 1.99 and 1.66 MJ m-2 d-1 for linear regressions and neural networks, and coefficients of correlation (r² between 0.88 and 0.92, respectively. Even though neural networks and linear regression models can be used to predict the daily global solar radiation appropriately, neural networks produced better estimates.La radiación solar incidente en el suelo es una variable importante usada en aplicaciones agronómicas, además es relevante en hidrología, meteorología y física del suelo, entre otros. Para estimarla se han desarrollado modelos empíricos que utilizan distintos parámetros meteorológicos y, recientemente, modelos de pronóstico y predicción basados en técnicas de inteligencia artificial tales como redes neuronales. El objetivo de este trabajo fue desarrollar modelos lineales y de redes neuronales, del tipo perceptr

  11. Diseño de una instalación solar térmica para abastecimiento de agua caliente sanitaria y calefacción por suelo radiante para un hotel

    Moral Soria, Guillermo; Morales Butrón, Jaime

    2013-01-01

    El presente proyecto abarca el dimensionado de los componentes de un sistema solar térmico de baja temperatura así como del sistema de energía auxiliar acoplado a él para el abastecimiento de agua caliente sanitaria y apoyo a calefacción por suelo radiante de un hotel, no incluyéndose el diseño de instalaciones colaterales como pueden ser instalaciones eléctricas o las redes de distribución.

  12. Solar radiation: the working out of the Reference Year for some brazilian cities; Radiacao solar: construcao do ano de referencia para algumas cidades no Brasil

    Macagnan, Mario H. [Universidade do Vale do Rio dos Sinos, Sao Leopoldo, RS (Brazil). Centro de Ciencias Exatas e Tecnologicas]. E-mail: mhmac@euler.unisinos.br

    2000-07-01

    This work presents a proposal for a solar irradiation Reference Year. Some results are presented obtained by analysing a solar irradiation data base generated from the brazilian Meteorology National Institute measured and published daily data, during the period of 1978-1980 for some brazilian cities. The obtained results can be used as project and energetic evaluation parameters for buildings. (author)

  13. A hybrid solar/diesel water heating system: in medicine area in a hospital in Mexico city; Sistema hibrido de energia solar y diesel para calentamiento de agua: caso en el area de medicina fisica en un hospital en la ciudad de Mexico

    Nolasco Mejia, Miguel; Wolpert Kuri, Jorge [UNAM, Mexico, D.F. (Mexico)

    2000-07-01

    A hybrid solar/diesel water heating system for therapy in a hospital in Mexico is described in this paper. The use of solar energy in hospitals and clinics, represent an environmentally friendly alternative to the burning of fossil fuels. Analysis is made regarding the feasibility of integrating both solar energy and conventional energy (fuel oil) as back up, to satisfy the hot water demand for hydrotherapy in a hospital. Results from simulation show that solar energy is a cheap means to provide up to 60% of the hot water demand. The solar assisted system proposed uses flat plate solar collectors integrated with an existing hot water tank, where water is heated with vapor from a diesel ran boiler. This represents significant savings on the solar system cost. [Spanish] La utilizacion de la energia solar en hospitales y clinicas, representa una posibilidad para obtener ahorros importantes de energia para satisfacer la demanda de agua caliente. En el presente estudio se analiza la demanda de agua caliente para uso en medicina fisica (hidroterapia), en un hospital ubicado en la Cd. De Mexico y la factibilidad de usar la energia solar, empleando como apoyo el sistema tradicional de combustible fosil (diesel). Mediante un analisis termico se determina el calor necesario para satisfacer la demanda de agua caliente. El analisis economico muestra los costos del sistema solar, los ahorros que se tendran y el periodo de recuperacion de la inversion. Los resultados muestran que la utilizacion de la energia solar es factible debido a la disminucion tanto del consumo de combustible, como de las emisiones atmosfericas. Se propone la instalacion de un sistema solar con colectores planos y el aprovechamiento de uno de los dos tanques de agua caliente existentes, donde se efectua la trasferencia de calor al agua por medio de vapor, lo cual disminuye el costo del sistema solar. La aportacion solar puede ser mayor del 60%, el complemento sera aportado por el sistema tradicional con

  14. Radiação solar estimada com base na temperatura do ar para três regiões de Minas Gerais Estimation of solar radiation by air temperature models for three regions of Minas Gerais

    Cláudio R. da Silva

    2012-01-01

    Full Text Available A radiação solar incidente (Rs é uma variável importante em estudos agrícolas, particularmente para a estimativa da evapotranspiração e em modelos para produtividade. Entretanto, sua medição não é, em geral, realizada em estações meteorológicas convencionais. O objetivo deste trabalho foi avaliar nove modelos empíricos de estimativa de Rs, a partir da temperatura, para as regiões Metropolitana, Vale do Rio Doce e Zona da Mata em Minas Gerais. Dados de Rs diários foram obtidos por estações meteorológicas automáticas instaladas nessas regiões e pertencentes ao Instituto Nacional de Meteorologia (INMET. Para todos os modelos foram gerados coeficientes locais de calibração. O desempenho de cada método foi avaliado através dos seguintes indicadores: coeficiente de determinação (R², raiz quadrada do quadrado médio do erro (RQME, erro médio (EM e teste t. A pequena diferença entre os modelos avaliados indica que qualquer um desses modelos é passível de utilização mas, dado à simplicidade, desempenho e significância, o modelo de Hargreaves, calibrado e com dois coeficientes, é o mais aplicável para estimar a radiação solar incidente.The incident solar radiation (Rs is an important variable in agricultural studies, particularly for the estimation of evapotranspiration and yield models. However, its measurement is not commonly performed in conventional meteorological stations. The aim of this study was to evaluate nine empirical models to estimate Rs from the temperature for the Metropolitan, Vale do Rio Doce and Zona da Mata areas in Minas Gerais State, Brazil. The models used were Hargreaves, Annandale, Chen, Bristow & Campbell, Donatelli & Campbell and Hunt. Data used were obtained by Rs daily automatic weather stations installed in these regions and belonging to Instituto Nacional de Meteorologia (INMET. For all models local calibration coefficients were derived. The performance of each method was evaluated

  15. Cerramientos bioclimáticos para climas cálidos húmedos: la cuarta vivienda

    Mustieles, F.

    1998-02-01

    Full Text Available In intertropical latitudes such as Venezuela with hot humid climates, building envelopes must reduce influence of solar radiation, and in these, roofs and windows must receive special attention. Venezuela is also the country with the highest energy consumption per capita in Iberoamérica, much of which is generated by air conditioning systems in residential buildings, and Maracaibo and the surrounding lake basin have some of the highest temperature and humidity values in Venezuela, which increase energy consumption even more. A bioclimatical house for this climate is proposed. This building incorporates principles from traditional indigenous, colonial and oil company houses in the Maracaibo lake basin to generate a new prototype, called the Fourth House.

    En climas cálidos húmedos como es el caso de grandes regiones de Venezuela, las envolventes deben reducir la influencia de la radiación solar y, por lo tanto, deben recibir atención especial. Venezuela es también el país con más alto consumo energético per capita en Iberoamérica, generado en su mayor parte por el uso de sistemas de aire acondicionado en las edificaciones residenciales. En Maracaibo y en los alrededores del Lago de Maracaibo se registran los valores más altos de temperatura y humedad en Venezuela, lo que incrementa, aún más, el consumo energético de las viviendas de estas regiones. La minimización del impacto de la radiación solar para lograr la reducción del consumo energético con un mayor bienestar térmico ha sido precisamente uno de los objetivos perseguidos con el desarrollo de una nueva vivienda bioclimática para la región del lago de Maracaibo. Esta incorpora principios de las tres viviendas bioclimáticas previas existentes en esa región: el palafito o vivienda tradicional indígena, la vivienda colonial republicana y la vivienda petrolera. Es por ello que esta vivienda ha sido llamada la Cuarta Vivienda.

  16. Thermochemical cycles based on metal oxides for solar hydrogen production; Ciclos termoquimicos basados en oxidos metalicos para produccion de hidrogeno solar

    Fernandez Saavedra, R.; Quejido Cabezas, J.

    2012-11-01

    The growing demand for energy requires the development and optimization of alternative energy sources. One of the options currently being investigated is solar hydrogen production with thermochemical cycles. This process involves the use of concentrated solar radiation as an energy source to dissociate water through a series of endothermic and exothermic chemical reactions, for the purpose of obtaining hydrogen on a sustainable basis. Of all the thermochemical cycles that have been evaluated, the most suitable ones for implementation with solar energy are those based on metal oxides. (Author) 20 refs.

  17. Diseño de instalación solar térmica multipropósito para un restaurante en Las Rozas (Madrid)

    Lorenzana Gaona, Alberto

    2012-01-01

    Este proyecto consiste en el diseño de una instalación solar térmica para tres propósitos. Se va a abastecer parcialmente de Agua Caliente Sanitaria (ACS), Calefacción y Refrigeración en un restaurante de comida rápida situado en la localidad de Las Rozas. Con ayuda de una caldera de apoyo se va a abastecer la demanda total. Para el diseño de la instalación se han cumplido las normativas del Código Técnico de la Edificación (CTE) en materia de ACS, el cual establece unos niveles mínimos de co...

  18. Desinfecção de efluentes com tratamento terciário utilizando energia solar (SODIS: avaliação do uso do dispositivo para concentração dos raios solares Disinfection of effluent of wastewater treated using solar energy (SODIS: evaluation of a solar concentrator device

    José Euclides Stipp Paterniani

    2005-03-01

    Full Text Available A energia solar, além de ser uma fonte natural disponível, é perfeitamente aplicável para desinfecção de águas em regiões menos favorecidas em infra-estrutura e recursos financeiros, uma vez que não há necessidade da dosagem de produtos químicos e não há custo já que materiais comerciais descartados podem ser reutilizados. O presente trabalho utilizou garrafas PET transparentes com a metade pintada de preto, sendo consideradas como variáveis do processo de desinfecção por ação da luz solar: tempos de exposição 1, 2, 4 e 6 horas e o uso de um concentrador de raios solares. Os parâmetros de controle do processo de desinfecção foram turbidez, cor aparente, temperatura, coliformes totais e E. coli, sendo os três últimos parâmetros avaliados antes e após o processo. Para a avaliação de reativação bacteriana a água foi armazenada em moringas de mesa por 24 horas, simulando uma situação comum nas residências rurais brasileiras. Os resultados mostraram que o uso do concentrador solar permite reduzir o tempo de exposição ao sol de 6 para 4 horas, sem prejuízo da eficiência do SODIS. Sendo utilizado o concentrador solar com tempo de exposição de 6 horas tem-se, além do processo de desinfecção, o processo de pasteurização solar (SOPAS, permitindo assim a utilização deste para potabilização da água. Também foi observado que a presença de nuvens reduz a incidência de radiação solar e, portanto, a eficiência do SODIS. Esta última ocorre mesmo com a água atingindo temperatura mais elevada durante a desinfecção.Besides being an available natural resource, the solar energy is very applicable in places with few recourses and low money resources, because there aren't either the need of chemical products neither a huge cost (commercial materials can be reused. To make this job we re-used PET bottles half painted black with the variables: 1, 2, 4 and 6 hours of heat exposion and we also used a

  19. EVALUACIÓN DE ALTERNATIVAS PARA CLIMATIZACIÓN DE ESTANQUES CON ENERGÍA SOLAR PARA CULTIVO DE TILAPIA ROJA (Oreochromis sp, LOCALIZADOS EN LA ZONA FRÍA DEL VALLE DEL CAUCA, COLOMBIA EVALUATION OF ALTERNATIVES FOR AIR CONDITIONING OF PONDS WITH SOLAR ENERGY FOR CULTIVATION OF RED TILAPIA (Oreochromis sp, LOCATED IN THE COLD AREA OF THE CAUCA VALLEY, COLOMBIA

    Francisco Javier Borja Gallardo

    2006-06-01

    Full Text Available La investigación fue desarrollada para que la tilapia roja (Oreochromis sp, especie de pez mÁs producida en Colombia, pueda ser explotada en lugares donde las condiciones óptimas para su normal desarrollo no son las adecuadas, como son las regiones altas con temperaturas por debajo de los 24 °C, aplicando metodologías relacionadas con el aprovechamiento de la energía solar. Las técnicas evaluadas fueron: climatización por medio de colectores solares, climatización por medio de manta térmica, climatización por medio de mangueras térmicas y climatización por medio de resistencias eléctricas. Se analizaron factores como funcionalidad, mantenimiento, limitaciones organizativas, espaciales, y costos.The research was developed so that the red tilapia (Oreochromis sp, fish species that more taken place in Colombia can be exploited in regions where the good conditions for its normal development are not the appropriate ones as in the high regions with temperatures below the 24 °C, applying methodologies related with the use of the solar energy. The evaluated methodologies were: air conditioning by means of solar collectors, air conditioning by means of thermal blanket, air conditioning by means of thermal hoses and air conditioning by means of electric resistances. Factors like functionality, maintenance, organizational and space limitations, and costs were analized.

  20. Evaluación de la energía térmica solar para generación de electricidad mediante un sistema Stirling en Huancayo

    Juan Cámac Núñez

    2015-12-01

    Full Text Available El objetivo fue determinar de qué manera influye la radiación solar en la generación de energía eléctrica en la ciudad de Huancayo, usando un sistema de generación eléctrica basado en un motor Stirling. Se describe las características de la energía solar en estas coordenadas del centro del Perú y las características de conversión de radiación solar en energía eléctrica. La investigación tuvo un diseño experimental, se implementó un sistema de generación eléctrica basado en el diseño de un colector solar cilíndrico, que aplica la energía térmica a un motor Stirling para generar energía eléctrica, se analizó cada etapa de estos procesos, se realizó las pruebas de funcionamiento y generación de energía térmica, energía mecánica y eléctrica con las experimentaciones. Se logró implementar un módulo de generación eléctrica teniendo como fuente la energía solar; en este se logró obtener los resultados de experimentación, desde el ingreso de la radiación solar, la temperatura en foco de concentración, la generación de energía mecánica la que nos genera un potencial eléctrico de salida de acuerdo a sus características propias del generador y motor Stirling, en condiciones propias a la radiación solar de la zona geográfica de estudio. Se concluye que la implementación del sistema de generación eléctrica del sistema Stirling permite disponer de un sistema integrado con sus procesos analizados, que permitió evaluar los valores de potencial eléctrico que nos brinda la energía solar a condiciones experimentales en esta región geográfica de estudio.

  1. Diseño de una fuente conmutada y galvanómetro digital para calibración de respuesta angular de sensores de radiación solar

    Nelson Díaz Spencer

    2015-12-01

    Full Text Available Con el objetivo de determinar el factor de corrección por altura del sol, en los piranómetros - albedómetros empleados en las estaciones actinométricas de Cuba para las mediciones de irradiancia solar, se ha instalado en el Grupo de Óptica Atmosférica de Camagüey un Sistema de Calibración de Respuesta Angular para sensores de radiación solar. Las mediciones realizadas en estas estaciones tributan proveen datos al Servicio de Diagnóstico de Radiación Solar para Cuba. La instalación de este sistema, único de en su tipo en el país, ha sido posible a través de un proyecto de colaboración con el Grupo de Óptica Atmosférica de la Universidad de Valladolid. Para el empleo de este sistema ha sido necesario diseñar y construir tanto, la fuente conmutada de alimentación para la lámpara halógena empleada para las calibraciones, y un galvanómetro digital para registrar los datos generados. El objetivo del presente trabajo es por tanto el diseño, construcción y puesta a punto de funcionamiento de ambos dispositivos. En el caso de la fuente conmutada se estudiaron fuentes con similares prestaciones existentes en el mercado, a partir de la cuales se procedió al diseño electrónico y simulación de los circuitos correspondientes. Finalmente, tanto la fuente conmutada como el galvanómetro digital fueron construidos y actualmente se encuentran en fase de validación. Este último instrumento será replicado para sustituir a sus similares analógicos en el Servicio de Diagnóstico de Radiación Solar para Cuba.

  2. A water heating system analysis for rural residences, using solar energy; Analise de um sistema de aquecimento de agua para residencias rurais, utilizando energia solar

    Basso, Luiz H.; Souza, Samuel N.M. de; Siqueira, Jair A.C.; Nogueira, Carlos E.C.; Santos, Reginaldo F. [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil). Programa de Pos-Graduacao em Engenharia Agricola], emails: melegsouza@yahoo.com, ssouza@unioeste.br, jairsiqueira@unioeste.br, cecn1@yahoo.com.br, rfsantos@unioeste.br

    2010-01-15

    The awareness of the importance of the environment has stimulated the study of new renewed energy sources and less pollutant. Amongst these sources, solar energy stands alone for being perennial and clean. The use of solar energy in systems of agricultural residential water heating, can complement the economy of electric energy, base of the Brazilian energy matrix. Knowing the factors that influence the operation of a system of water heating by solar energy is important in determining their technical viabilities targeting their distribution in agricultural residences. To evaluate equipment of water heating for solar energy, a prototype was constructed in the campus of Assis Gurgacz College, in Cascavel,State of Parana, Brazil, with similar characteristics to equipment used in residences for two inhabitants, to function with natural circulation or thermo siphon and without help of a complementary heating system. The equipment revealed technical viability, reaching the minimum temperature for shower, of 35 deg C, whenever the solar radiation was above the 3,500 Wh m{sup -2}, for the majority of the studied days. (author)

  3. Tratamento térmico do leite acondicionado em filme plástico em banho-maria Heat treatment of raw milk in plastic bags

    AJ.de Oliveira

    1994-04-01

    Full Text Available O presente trabalho foi realizado com a finalidade de se conseguir um procedimento de pasteurização prático e de baixo custo para pequenos produtores de leite, assegurando assim um aumento do tempo de conservação e consequentemente de comercialização do produto, sem riscos para o consumidor. Para tal, amostras de leite já acondicionadas em filme plástico (l litro foram submetidas a diferentes tratamentos térmicos, sempre utilizando-se banho-maria a 70 ± 1,0°C e variando-se os tempos de exposição. Os resultados obtidos se mostraram satisfatórios sob o ponto de vista físico-químico e microbiológico, reduzindo drasticamente em pouco tempo de exposição a população microbiana e eliminando totalmente as bactérias coliformes totais e fecais presentes no leite cru.In this study one litre plastic bags, filled with raw milk were submited to heat treatments in water bath at 70 ± 1,0°C. The time of treatment varied from 5 to 25 minutes. The results found showed that the heat treatments did not affect the physical-chemical properties of milk at any time and reduced the total microbial population at levels compatible with the Brazilian legal standards and eliminated completely total and feacal coliforms present in the raw milk.

  4. A flat solar collector built from galvanized steel plate, working by thermosyphonic flow, optimized for Mexican conditions; Un colector solar plano construido de lamina de acero galvanizada, operando por flujo termosifonico, optimizado para las condiciones mexicanas

    Marroquin de Jesus, A; Olivares Ramirez, J.M.; Ramos Lopez, G.A.; Pless, R.C. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro (Mexico)]. E-mail: amarroquind@utsjr.edu.mx

    2009-07-15

    Design, construction, and testing of the thermal performance of a flat solar collector for domestic water heating are described. The absorbing plate is built from readily available materials: two sheets of galvanized steel, one of the channelled types, the other one flat, which are joined by electric welding. The absorber is connected to a 198-L thermotank, insulated with polyurethane foam. In terms of receiving surface, the prototype tested here has an area of 1.35 m{sup 2}, about 20% smaller than comparable copper-tube-based collectors offered in the market. Temperature measurements conducted over a 30-day period gave values which were a few degrees lower than the theoretically calculated water temperatures. Momentary thermal efficiency values between 35% and 77% were observed. The water temperature achieved the tank at the end of the day averages 65 degrees Celsius in winter weather conditions in the central Mexican highland. This design of solar water heater is well suited to Mexican conditions, as it makes use of the high local intensity of the solar radiation, and as the channel shape of the ducts minimizes bursting during the rare occurrences of freezing temperatures in the region; it also has the advantage of being manufacturable at low cost from simple materials. [Spanish] Se describe el diseno, construccion y pruebas del desempeno termico de un colector solar plano para calentamiento de agua para uso domestico. La placa absorbedora se construyo de materiales facilmente asequibles: dos placas de acero galvanizado, una del tipo acanalado y la otra plana, unidas mediante soldadura de acero electrico. La placa absorbedora esta conectada a un termotanque con capacidad de 198 L, aislado con espuma de poliuretano. La superficie receptora de este prototipo es de 1.35 m{sup 2}, aproximadamente 20% mas pequena comparado con los colectores, basados en tubos de cobre, ofertados en el mercado. Mediciones de temperatura por un periodo de 30 dias, arrojaron valores

  5. Diseño de una instalación solar térmica con aplicaciones para acs y calefacción en un bloque de viviendas ubicado en Pontevedra

    Martínez Fontúrbel, Eduardo

    2009-01-01

    La realización del presente proyecto tenía como objetivo principal la de desarrollar una instalación solar para satisfacer la demanda de ACS y calefacción de la forma más eficiente posible teniendo en cuenta tanto la energía solar aprovechable del Sol y la viabilidad económica del proyecto. Además del diseño de la instalación se ha querido analizar de forma detallada los principales aspectos de funcionamiento de la instalación para buscar con ello la mejor respuesta posible ...

  6. Sistema Híbrido (Solar-Eólico) con apoyo de gas natural para la generación de energía eléctrica en Baja California Sur (México)

    Fernández Ribaya, Yolanda

    2012-01-01

    Una aplicación prometedora de las energías renovables son las instalaciones de sistemas híbridos, formados por energías renovables (solar, eólica, biomasa e hidráulica) y energías convencionales. El estado mexicano de Baja California cuenta con importantes recursos eólicos y solares para la generación de electricidad; sin embargo debido a su naturaleza intermitente, estas fuentes requieren de un sistema de apoyo convencional para garantizar el suministro eléctrico. Este estudio describe el de...

  7. Thermal analysis of a solar collector consisting of V cavities for water heating; Analise termica de um coletor solar composto de cavidades V para aquecimento de agua

    Moreira, Michel Fabio de Souza

    2009-03-15

    The solar water heating is carried through, in Brazil, by means of solar heaters compound for collectors flat plate of the type plate-and-pipes, devices that operate in stationary position and they do not require tracking of the sun. A compound collector for some formed V-trough concentrators can be an alternative to the conventional solar collectors flat plate. This compound collector for V-trough is considered, each one, for side-walls which are specularly reflecting surfaces associates in V (equivalent to a triangular gutter). Next to the vertex to each V-trough concentrators an absorber tube is fixed, for flow of the fluid to be heated. Interconnection of the absorbers tubes forms a similar tubular network existing in solar collectors of the type the plate and pipe. V-trough concentrators with the absorbers tubes are made use in series in the interior a prismatic box, which have one of its faces consisting by a glass covering and directed toward incidence of the solar radiation. An analysis of thermal performance of these devices operating stationary and without tracking of the sun is researched. A mathematical model for the computational simulation of the optical and thermal performance of these concentrative devices is elaborated, whose implementation was carried through software EES (Engineering Equation Solver). The efficiency optics of V-trough concentrators with cylindrical absorbers is calculated from the adaptation of the methodology used for Fraidenraich (1994), proposal for Hollands (1971) for V-trough cavities with plain absorbers. The thermal analysis of the considered collector was based on the applied methodology the CPC for Hsieh (1981) and Leao (1989). Relative results to the thermal performance of V-trough concentrators suggest that these configurations are not competitive, technique and economically, with the conventional plain collectors. Although some geometric configurations presented next thermal efficiencies to the conventional plain

  8. Proteção solar para crianças: estudo preliminar sobre conhecimentos e atitudes dos pais = Sun protection for children: preliminary study on the knowledge and attitudes of parents

    Silva, Luana Rosa da

    2011-01-01

    Conclusão: Os hábitos, cuidados e práticas de exposição solar dos pais para com seus filhos não estão adequados e o conhecimento acerca do assunto câncer da pele é dito por eles insuficiente, embora tenham noções dos perigos da exposição solar exagerada

  9. Electric power generation using photovoltaic solar cells for low income rural population; Geracao de energia eletrica com celula solar fotovoltaica para populacao rural de baixa renda

    Gastaldi, Andre Fava; Souza, Teofilo Miguel de; Mesquita, Rafael Pimenta [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Guaratingueta, SP (Brazil). Centro de Energias Renovaveis], e-mail: teofilo@feg.unesp.br

    2004-07-01

    With the growing electric energy use demand and almost not expansion of the energy mesh (basically composed by hydroelectric plants) existing in the country, several others methods of alternative energy generation may be necessary. Beyond that, the usually employed energy is becoming much more costly, rarer and politically more impracticable like burn fuels as oil and coal. The use of renewable approaches of energy, that are 'infinite' energies (as the wind and the light of the sun, for example), can become an excellent alternative. In this new energy group, the solar energy transformed by the use of photo voltage cells is becoming very important. The 'clear' solar radiation tends to be a more intelligent and practical option, and the future technology of energy storage will be able to solve the problem of the regions that have less sunny days. Its main advantages on the other alternative sources of energy are the trustworthiness and the previsibility. Its biggest disadvantage consists on the fact that technical limitations can not allow a solar energy generator to distribute electricity for a city. It is interesting to notice that with the development of projects as this in alternative energy, isolated areas that does not access electricity distribution network (as some far regions), it has become the most viable option of generation of electric energy. Another point is that even with the distribution network it has to be checked if it is possible to use this electricity consulting the company credential that work at those localities of consumption. Moreover, many regions of the country already installed the solar energy system for water heating, confirming that, the existing structure allows the installation of a a solar cells generation energy system without many problems. In this project, we introduce a method for electric energy generation by solar cells for rural population of low gains. This option uses low cost materials but with a good

  10. Uso de cubiertas plásticas para solarización de estiércol bovino Use of plastic covers for solarization cattle manure

    Cirilo Vázquez Vázquez

    Full Text Available El presente trabajo se realizó con la finalidad de evaluar cubiertas plásticas, para emplearlas en la solarización de estiércol bovino, como un método activo que pueda lograr la inactivación de patógenos, para obtener un residuo orgánico e inocuo. En los meses de junio y julio de 2004, se compararon tratamientos de pilas de estiércol cubiertas con plástico transparente sin albedo de 100 µm de grosor, una con cubierta sencilla, otra con cubierta doble y un testigo sin cubrir. Se tomaron muestras del estiércol solarizado y sin solarizar, para realizar la siembra en medios de cultivo de papa-dextrosa-agar, para detectar hongos coprofilos así como para detectar Escherichia coli y Salmonella spp. Los resultados mostraron mayor homogeneidad de temperatura en la pila con doble cubierta en el plano vertical, con 62 ºC a 30 cm de profundidad y 60 ºC a 90 cm, la cubierta sencilla alcanzó una temperatura de 61.5 ºC en el estrato superior y 58 ºC a 90 cm de profundidad, el testigo mostró mayor heterogeneidad con valores de 58 ºC a 30 cm y 47 °C a 90 cm con una variación de 11 ºC. Los resultados de los análisis previos a la solarización mostraron presencia de la bacteria Escherichia coli y Salmonella spp., en muestreos posteriores sólo en el testigo se encontró a estos patógenos.The present work was carried out with the purpose of evaluating plastic covers, to use them in solarization of bovine manure, as an active method that can achieve pathogens deactivation, to obtain an organic and innocuous residual. In months of June and July of 2004, were compared stack treatments of manure covered with transparent plastic without albedo of 100 µm thickness, one with single cover, another with double cover and without cover a control one. Samples of solarized manure and without solarization were taken, to carry out sowing in culture media of potato-dextrose-agar, to detect coprophilous fungi as well as to detect Escherichia coli and

  11. Photovoltaic energy: environmental and economic analysis of axis solar trackers for photovoltaic installations; Energia fotovoltaica: analise economica ambiental de seguidores solares para instalacoes fotovoltaicas

    Paes, Andrea Galvao; Bertolon, Expedito; Pacca, Sergio [Universidade de Sao Paulo (EACH/USP), SP (Brazil). Escola de Artes, Ciencias e Humanidades. Curso de Gestao Ambiental

    2008-07-01

    In this work we present an economic assessment photovoltaic systems using single axis and dual axis solar trackers. The analysis was carried out for the city of Sao Paulo and the results show that in comparison with fixed installations, the single axis system and the dual axis system produce respectively 19.6% and 24.7% more power. The power output of the dual axis system is 4.3% greater than the power output of the single axis system. Considering an annual discount rate of 12% and the equipment cost, the cost of the surplus energy due to the use of the single axis and the dual axis trackers was R$0.25/kWh and R$0.18/kWh. Because the average cost of electricity produced by photovoltaic modules is R$3/kWh, we recommend the installation of solar trackers. (author)

  12. Solar chimney for the natural ventilation of buildings: simulation and mediation; Chimenea solar para la ventilacion natural de edificios: simulacion y mediacion

    Lanceta, D.; Llorente, J.

    2008-07-01

    In this article, the first part of a research project about the modelling of a solar chimney is presented. In this first part, the average ventilation flows measured in an experimental installation have been compared to the results obtained by CFD (Computational Fluid Dynamics) simulations. In order to do so, a solar chimney with a cross-section of 0.78 m x 0.156 m, height 3,6 m, has been constructed. The chimney consists of a glass surface oriented towards the south. The internal (absorber) surface is made of a copper plate, which has been painted black in order to increase the solar absorption. The chimney is connected to a room measuring 5 m x 2.5 m x 2.5 m, from where it extracts air. The comparison of the results obtained by measurements with those obtained by CFD simulations show that computational tools are accurate enough to predict the behaviour of natural buoyancy in this kind of installations. (Author)

  13. Modelação computacional e validação de soluções solares passivas para a melhoria do conforto térmico de uma edificação pré-fabricada

    Bot, Karol

    2015-01-01

    As estratégias solares passivas aplicadas à uma edificação permitem que esta apresente um consumo de energia mais eficiente, reduzindo a dependência à recursos advindos de fontes de energia não renováveis para o condicionamento do ar interior e promovendo a sustentabilidade no setor residencial. Desta forma, é interessante quantificar o potencial de redução de necessidades de consumo de energia para o aquecimento e arrefecimento, e para isso nesta dissertação utilizou-se o soft...

  14. Comparação de produtos de radiação solar incidente à superfície para a América do Sul Product comparison of solar radiation incident surface for South America

    Lucía Iracema Chipponelli Pinto

    2010-12-01

    Full Text Available Para algumas aplicações meteorológicas, o conhecimento da radiação solar incidente à superfície (Sin é muito importante. Métodos convencionais de medida deste fluxo são pontuais e, portanto, representativos de pequenas áreas. Por outro lado, os satélites meteorológicos possibilitam uma cobertura regular de todo o globo terrestre, proporcionando estimativas de fluxos radiativos sobre grandes áreas com resolução espacial do sensor (apenas alguns quilômetros. Além disso, produtos de reanálise fornecem estimativas alternativas de Sin, que precisam ser adequadamente validadas. Este trabalho compara quatro bancos de dados de radiação solar incidente para a América do Sul: três produtos provenientes de reanálise (NCEP/NCAR, ERA-40 e Eta/CPTEC e o produto gerado pelo algoritmo GL1.2, que produz estimativas da Sin a partir do conjunto de imagens do satélite GOES. Os resultados mostram que os campos de radiação solar incidente dos produtos de reanálise do NCEP/NCAR, ERA-40 e as estimativas do satélite GOES apresentam valores médios mensais bem próximos para todos os biomas e bacias estudados. Já a reanálise do Eta/CPTEC apresentou valores bem mais elevados para à radiação sobre a América do Sul, tanto para a média anual como nas médias mensais analisadas.For some meteorological applications, knowledge of incoming solar radiation at surface level (Sin is very important. Conventional measurements of this flux by individual sensors are representative of small areas only. On the other hand, meteorological satellites allow a regular cover of the entire globe, providing estimates of radiative fluxes over wide areas, within the spatial resolution of the sensor (a few km. In addition, reanalysis products provide alternative Sin estimates that must be adequately validated. This work compares four long-term Sin databases for South America: three reanalysis products (NCEP/NCAR, ERA-40 e Eta/CPTEC and the database produced by

  15. Execução de um projecto solar térmico para uma instalação de A.Q.S. da Escola Básica Guilherme Stephens

    Silva, Miguel Martins da

    2012-01-01

    O presente documento tem como principal objectivo efectuar o projecto de dimensionamento de um sistema de águas quentes sanitárias para uma escola. Numa primeira fase foi elaborado uma pesquisa sobre o contexto energético, a nível mundial, europeu e nacional, bem como o seu contexto jurídico a nível europeu e nacional, e uma explicação superficial sobre os fundamentos da energia solar, onde se foca a importância da radiação solar e os vários tipos de sistemas solares térmicos, bem como os ...

  16. Atmosfera modificada e refrigeração para conservação pós-colheita da nêspera 'Fukuhara'

    Juliana Sanches; Patrícia Cia; Silvia Regina de Toledo Valentini; Eliane Benato; Edvan Alves Chagas; Rafael Pio

    2011-01-01

    A rápida perda de qualidade pós-colheita limita a comercialização da nêspera no mercado de frutas frescas. Neste sentido, este trabalho teve por objetivo avaliar os efeitos da utilização de atmosfera modificada na conservação pós-colheita da nêspera 'Fukuhara' armazenada sob refrigeração (1 °C / 90% UR). Para tanto, os frutos (≈450 g) foram acondicionados em bandejas de poliestireno e embalados em dois tipos de filme: polietileno de baixa densidade (PEBD, 50 µm) e polipropileno (PP, 30 µm), s...

  17. Study on the viability for the implantation of a hydrogen-solar-aeolian system for the state of Ceara, Brazil; Estudo de viabilidade para implantacao de um sistema a hidrogenio-solar-eolico para o estado do Ceara, Brazil

    Sales, A.D.; Sacramento, E.M. do; Lima, L.C. de [Universidade Estadual do Ceara (UECE), Fortaleza, CE (Brazil)

    2008-07-01

    The state of the Ceara imports most of its consumed energy, configuring itself as a region eminently energy importer. However, the manufacture of its wind power Atlas demonstrated a high potential for the generation of electric energy originated from this renewable source. It is known, also, through studies, that this state possesses high potential for the exploitation of solar energy also for the generation of electric energy. A clean option to obtain hydrogen is the utilization of such renewable sources. This work presents results of the application of a model of solar-wind hydrogen energy for the Ceara state and variables such as population, gross intern product, energetic demand, energy imports, fossil fuel and hydrogen prices, income from hydrogen sale, and others parameters. The hydrogen will be produced from the sea water desalinisation, using solar and wind energies. The produced hydrogen eventually will be introduced in Ceara State through three scenarios which are one of, fast introduction, other of slow introduction and other of no introduction of hydrogen. (author)

  18. Use of Lagrange interpolating numerical method to correct solar databases; Utilizacao do metodo numerico interpolador de Lagrange para correcao de bases de dados de radiometria solar

    Penteado, Miguel Suarez Xavier [Pos-Graduacao em Agronomia - Energia na Agricultura, FCA UNESP - Botucatu, SP (Brazil), Dept. de Recursos Naturais], e-mail: miguel_penteado@fca.unesp.br; Escobedo, Joao Francisco [Dept. de Recursos Naturais, FCA/UNESP, Botucatu, SP (Brazil)], e-mail: escobedo@fca.unesp.br; Dal Pai, Alexandre [Faculdade de Tecnologia de Botucatu - FATEC, Botucatu, SP (Brazil)], e-mail: adalpai@fatecbt.edu.br

    2011-07-01

    This work explores the suitability of the Lagrange interpolating polynomial as a tool to estimate and correct solar databases. From the knowledge of the irradiance distribution over a day, portion of it was removed for applying Lagrange interpolation polynomial. After generation of the estimates by interpolation, the assessment was made by MBE and Rms statistical indicators. The application of Lagrange interpolating generated the following results: underestimation of 0.27% (MBE = -1.83 W/m{sup 2}) and scattering of 0.51% (Rms = 3.48 W/m{sup 2}). (author)

  19. Appropriate technology for sustainable family agriculture in the semi-arid: solar water pumping for located irrigation; Tecnologia apropriada para a agricultura familiar sustentavel do semi-arido brasileiro: bombeamento solar de agua para irrigacao localizada

    Costa, Heitor Scalambrini [Universidade Federal de Pernambuco (NAPER/UFPE), Recife, PE (Brazil). Nucleo de Apoio a Projetos de Energias Renovaveis], Email: naper@ufpe.br

    2006-07-01

    Water and energy are the physic factor, which are most influential on the life conditions in the semi-arid rural environment as a whole and in the agriculture production systems in particular. Water is a resource, which - even though not rare - is found in limited quantities and not always is available on the ground surface, meaning that it should be retrieved through either proper wells or deep holes excavated into ground. Therefore, its use should be optimized. In the rural environment to turn water into an available resource in a sufficient amount in order to improve the population life conditions is still a challenge. In the rural semi-arid regions the electric energy distribution is small compared to the other regions of the country. Nevertheless the geographic position of the Brazilian Northeast - close to the equator - adds to this region high levels of insolation - something close to 3,000 hours of sunshine per year - turning this energy resource into a very abundant one. It is known that the use of solar energy, among the use of other resources, has increased the most worldwide in the last decade. The use of photovoltaic cells has increased around 17% per year in the 90's. In the last years several applications, which had the sun as their electric energy resource, were implemented in the rural areas of many countries. The Brazilian Northeast region was the preferred target of programs and projects aiming at the dissemination of the photovoltaic solar technology. Water pumping is one among the most noble applications of the photovoltaic solar technology. There are many pumping systems configurations for either deep or shallow wells, which use either superficial, immerse or floating motor-pumps, which in turn can be driven by either continuum or alternate current. In this work the usage of water pumped with solar energy from Amazon wells (also called 'cacimboes') for small family-based areas of localized irrigation (less than 1 ha), whose main

  20. Optimal geometry and dimensions for the receiver of a parabolic solar concentrator with an angle of 90 degrees; Determiancion de la geometria y dimensiones optimas de un receptor para un concentrador solar paraboloidal con angulo de apertura de 90 grados

    Estrada, Claudio A; Arancibia, Camilo [Centro de Investigacion en Energia UNAM, Temixco, Morelos (Mexico); Hernandez, Nestor [Centro Nacional de Investigacion y Desarrollo Tecnologico, Cuernavaca, Morelos (Mexico)

    2000-07-01

    The optimal geometry and dimensions for the receiver of a parabolic solar concentrator based on microwave communication antenna are obtained. First, the experiments for the determination of the angular error of the concentrator and the dimensions of its focal region are described. Results are also presented for the ray tracing study, from which the optimal characteristics of the receiver are obtained according to the experimental results. As the aluminum antenna has a rim angle of 90 Celsius degrees, it is necessary to use a cavity receiver to allow external as well as internal absorption of radiative flux. Cylindrical, conical and spherical geometric were considered, as well as combinations of them. The best results are achieved using a conical cavity. Its dimensions are calculated to maximize the radiative transfer efficiency from the aperture of the concentrator to the receiver. [Spanish] Se determinan la geometria y dimensiones optimas del receptor de un concentrador solar parabolico obtenido a partir de una antena de telecomunicaciones para microondas. Primeramente se describen los experimentos realizados para obtener el valor del error angular asociado al concentrador y de las dimensiones de su region focal. Tambien se presentan los resultados del estudio optico de trazado de rayos, que permitio determinar teoricamente las caracteristicas del receptor, de acuerdo a los resultados de los experimentos. Debido a que la antena de aluminio tiene un angulo de borde de 90 grados Celcius, es necesario usar un receptor tipo cavidad que permita la captacion de energia tanto interna como externa. Se consideraron geometrias cilindrica, conica, esferica y combinaciones entre ellas, resultando ser la conica la que da los mejores resultados. Las dimensiones del receptor fueron determinadas maximizando la eficiencia del transporte de radiacion de la apertura del concentrador al receptor.

  1. Appropriate technology for solar energy system aiming water heating for human bath in houses of rural areas; Tecnologia apropriada para sistema de energia solar visando aquecimento de agua para o banho humano em moradias do meio rural

    Rispoli, Italo Alberto Gatica [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Civil, Arquitetura e Urbanismo], e-mail: gatica@dglnet.com.br; Mariotoni, Carlos Alberto [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Fac. de Engenharia Civil, Arquitetura e Urbanismo. Nucleo Interdisciplinar de Planejamento Energetico], e-mail: cam@fec.unicamp.br

    2004-07-01

    The Brazilian land receives a great amount of solar radiation all over the year, therefore, because both the culture and practical aspects, Brazilians use in a non-moderate way the electricity to boil the water for human bath in the rural homes, in the lower income residences even at part of the medium class homes. That happens due to the very low price of an electrical shower, about US$ 6,5. In fact, that way of heating water is largely used because, besides the very low electrical shower price, it is not necessary to install a complete hot water both hydraulic and electrical building systems, but just both single hydraulic pipes and electrical devices. On the other hands, at rural regions where the electricity does not achieve the rural people uses firewood in order to get hot water for human bath. At the rural places the use of electrical showers has meaning an increase in the electrical transformers powers, heavier electrical transmission rural lines, with greater prices and, at the urban zones, the use of electrical showers in the lower social classes has contributed to a more expressive electrical load at the nacional electrical system load peck, between 5:30 to 8:30 a.m. The public administration, mostly, does not take into account both social, economic and environmental costs in order to think about the electricity offer. The solar heating systems, generally used in Brazil, conserves the same reservoirs used in France at 1880. Therefore, this paper presents some technical subsidies applied to rural homes, even to lower income people's homes aiming to stimulate the Brazilian public authorities to make a public police to facilitate both the industrialization and dissemination of solar heating systems, appropriate to the rural area, with lower costs, compounded by good technology equipment, with guarantee of lasting and quality. (author)

  2. Estimativa da radiação solar global a partir dos dados de insolação, para Santa Maria - RS Estimation of global radiation from insolation data for Santa Maria, RS, Brazil

    Galileo Adeli Buriol

    2012-09-01

    Full Text Available Foram determinados os coeficientes a e b da equação de Angströn-Prescott para a estimativa da radiação solar global para Santa Maria, RS. Utilizaram-se os dados diários da intensidade de fluxo de radiação solar global e de insolação (brilho solar registrados na Estação Meteorológica pertencente ao 8° Distrito de Meteorologia, localizada no Campus da Universidade Federal de Santa Maria - UFSM, período 2002-2008. Os dados foram copiados no banco de dados do 8° Distrito de Meteorologia - 8° DISME, em Porto Alegre, e calculados os valores diários de radiação solar global no topo da atmosfera e de insolação máxima possível, considerando a latitude local. Com esses dados, foram determinadas as equações mensais e estacionais de regressão para a estimativa da radiação solar global em função da insolação. Constatou-se que existe alta correlação entre os dados de radiação solar global com aqueles de insolação, sendo, assim, possível estimar a radiação solar global em função da insolação.Coefficients a and b of the Angströn - Prescott equation to estimate global solar radiation for Santa Maria, RS were determined. Daily data of global solar radiation and sunshine, were obtained from the Meteorological Station which belongs to the 8th District of Meteorology, located on the campus of the Federal University of Santa Maria - UFSM, period from 2002 to 2008. The mentioned data were copied from the database of the 8th District of Meteorology - 8th DISME in Porto Alegre. Top of atmosphere radiation and possible maximum sunshine were calculated considering local latitude. With such elements, monthly regression equations were determined for the estimation of solar radiation as a function of insolation. We found a high correlation between insolation and global solar radiation and it's possible to estimate the solar radiation depending on the measured insolation.

  3. Thickness calculation software of the thermal insulation in facilities using thermal solar energy; Software para el calculo de espesores del aislante termico en instalaciones de aprovechamiento de energia solar termica

    Portillo Jimenez, Canek [Universidad Autonoma de Sinaloa, Culiacan, Sinaloa (Mexico)]. E-mail: cnk@uas.uasnet.mx

    2010-11-15

    It is presented a software application for calculating the thickness of the thermal insulation used in various facilities where there are thermal systems using solar energy. The software facilitates the calculation of the thermal cover thickness over components such as pipes (flat or round), storage and other devices that require thermal protection, installed in outdoors or indoors. The software was programmed in Visual Basic by following the technical specifications of the current regulations in the field. Application examples are performed, obtaining certain results that are discussed briefly. [Spanish] Se presenta un software de aplicacion para el calculo de los espesores de los aislantes termicos, utilizados en diferentes instalaciones donde existen sistemas de aprovechamiento termico de energia solar. El software facilita el calculo del grosor del recubrimiento termico en componentes tales como: tuberias (planas o circulares), depositos acumuladores y otros aparatos que necesiten proteccion termica, instalados en exteriores o en interiores. El software fue programado en Visual Basic siguiendo las especificaciones tecnicas de la normatividad vigente en la materia. Se realizan ejemplos de aplicacion, donde se obtienen ciertos resultados de los cuales se hace una breve discusion.

  4. Análisis y diseño de un sistema SCADA para paneles solares fotovoltaicos

    Yebra Pérez, Jaume; Lagos Fernández, Núria

    2006-01-01

    PRESENTACIÓN: Frente al aumento del consumo energético y la insostenibilidad del modelo energético actual, las fuentes de energía renovables tienen un peso decisivo. La energía solar, es la energía con más posibilidades que hay, y aunque el futuro es esperanzador, actualmente su aprovechamiento es muy limitado. Los sistemas SCADA, es decir, los sistemas de supervisión y control, en el mundo de la ingeniería son una materia multidisciplinar, con grandes posibilidades...

  5. Cocedores Solares

    del Rio Portilla, Jesús Antonio; Tapia Salinas, Saúl; Jaramillo Salgado, Oscar Alfredo

    2011-01-01

    En este trabajo se presentan algunas ideas sobre las limitaciones que han tenido los hornos o las estufas estufas solares para su utilización en gran escala. Se propone una solución a través de un dispositivo híbrido, los cocedores solares automatizados. Se esquematiza un modelo termodinámico para describir la evolución de la temperatura en el interior del cocedor. Así como se presentan los resultados de la evaluación de indicadores de sabor, color, textura, olor y apariencia (las característ...

  6. Utilização de sistemas fototérmicos com concentradores para higienização de salas de ordenha Use of the thermal solar systems with concentrators for the hygiene of milking parlor

    Leandra Altoé

    2010-10-01

    Full Text Available Neste trabalho, analisou-se a viabilidade do uso de concentradores de radiação solar em sistemas fototérmicos para higienização de salas de ordenha. Foram analisadas três opções para aquecimento de água com reservatório de acumulação: sistema com resistência elétrica, sistema solar com concentrador e sistema solar sem concentrador. Calculou-se o custo total dessas alternativas e o valor presente líquido do sistema solar suplementado por lenha de eucalipto comprada, lenha de eucalipto produzida na propriedade rural, energia elétrica e gás liquefeito de petróleo (GLP. Realizou-se uma análise de sensibilidade do sistema fototérmico variando o número de vacas lactantes, o custo da energia elétrica e da lenha, a taxa de juros, o custo dos componentes do sistema, a vida útil e o subsídio no valor do equipamento. O sistema fototérmico com concentrador suplementado por lenha produzida na propriedade foi a alternativa de aquecimento mais viável economicamente. O uso dos concentradores gera uma redução de cerca de 10% no custo de aquisição do sistema de aquecimento solar.In this study, we analyzed the feasibility of using radiation concentrators in thermal solar systems for the hygiene of milking parlors. We analyzed three options for water heating with tank accumulation: system with electric resistance, the solar system with concentrator and the solar system without concentrator. It was calculated the total cost of these alternatives and the net present value of the solar system supplemented by purchased eucalyptus wood, eucalyptus wood produced on the farm, electricity and liquefied petroleum gas (LPG. A sensitivity analysis of the thermal solar system varying the number of dairy cows, the electricity and the firewood costs, the interest rate, the system's components cost, the life expectancy and the subsidy on the equipment value. The thermal solar system with concentrator supplemented by firewood produced on the property

  7. Dimensionado de una instalación de energía solar térmica para la producción de agua caliente sanitaria en la residencia geriátrica asistida "San Juan Grande"

    Morión Puerto, Inmaculada

    2014-01-01

    El siguiente proyecto se centra en el estudio del dimensionado de una instalación de energía solar térmica de baja temperatura para la producción de agua caliente sanitaria en la residencia geriátrica asistida “San Juan Grande” en Jerez de la Frontera, provincia de Cádiz. Es un edificio que fue construido en 2001, en su momento no estaba la normativa actual por la que es obligatorio para todos los edificios de nueva construcción implementar, en función de la zona climática y...

  8. Long term vision on the use of the renewable energies in Mexico: Solar energy. Second Part: Technologies for the advantage of the solar energy (Annexe 6-II in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Vision a largo plazo sobre la utilizacion de las energias renovables en Mexico: Energia solar. Segunda Parte: Tecnologias para el aprovechamiento de la energia solar (Anexo 6-II en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Estrada Gasca, Claudio A; Arancibia Bulnes, Camilo A; Dorantes Rodriguez, Ruben; Islas Samperio, Jorge; Muhlia Velasquez, Agustin [Universidad Nacional Autonoma de Mexico (Mexico)

    2005-08-15

    Usually one distinguishes two main types of systems of advantage of the solar energy: the photovoltaic and the photo thermal ones. The first ones are those based on the photovoltaic effect, which allows the direct conversion of the energy of the solar radiation in electrical energy. The second ones transform the solar energy into heat, which can be used in a large variety of processes. By the degree of development of both technologies it is advisable to present them in different sections. Also, there is a great variety of technologies of photo thermal systems that we have classified as technologies for the termosolar generation of electrical power, whose temperatures of operation are high, technologies the solar heating at low temperatures and technologies for industrial heat process. [Spanish] Se suele distinguir dos tipos principales de sistemas de aprovechamiento de la energia solar: los fotovoltaicos y los fototermicos. Los primeros son aquellos basados en el efecto fotovoltaico, que permite la conversion directa de la energia de la radiacion solar en energia electrica. Los segundos transforman la energia solar en calor, el cual puede ser utilizado en una gran variedad de procesos. Por el grado de desarrollo de ambas tecnologias es conveniente presentarlas en secciones diferentes. Asi mismo, existe una gran variedad de tecnologias de sistemas fototermicos que hemos clasificado en tecnologias para la generacion termosolar de potencia electrica, cuyas temperaturas de operacion son altas, tecnologias para el calentamiento solar a bajas temperaturas y tecnologias para calor de proceso industrial.

  9. Solar desalination System of Sea Water for Efficient Irrigation of a Crop Module; Sistema de desalacion solar de agua de mar para riego eficiente en un modulo de cultivo

    Porta Gandara, Miguel Angel; Rubio Cerda, Eduardo; Fernandez Zayas, Jose Luis [Centro de Investigaciones Biologicas del Noreste (Mexico)

    2002-06-01

    The lack of vegetables in the diet of people living by the seaside in Mexican California results in important health problems. It is not easy to produce vegetable due to the lack of potable water. In order to solve this problem, this paper introduces a household agricultural production system utilizing seawater, which is distilled by means of a shallow solar still. The still has a free surface of 10 m{sup 2} and can yield an average daily quantity of 5/m{sup 2} daily. Distilled water is employed to grow vegetable (basically radishes, pumpkins and tomatoes) in an experimental plot of land where a highly efficient irrigation is pursued. Hence, it is possible to obtain biomass production of about 1 kg of fresh product for every 19 to 200 liters of distilled water, depending on the crop, in also variable crop cycles, between 30 and 150 days of duration. This paper ends with an economic evaluation and the assessment of water use. In comparison with the irrigation district of the valley of Santo Domingo, B. C. S., where extreme lack of water is felt, water is used in the latter in a proportion of between 180 and 500 times more than the strictly indispensable per unit product. [Spanish] La carencia de verduras en la dieta de los habitantes del litoral californiano produce graves problemas de salud, pero no es facil producir hortaliza, dada la carencia de agua potable. Con el fin de subsanar esta deficiencia, se presenta un sistema para producir alimentos a escala unifamiliar, usando agua de mar destilada mediante un destilador solar somero de 10 m{sup 2} de superficie, capaz de arrojar una produccion promedio de 5 l/m{sup 2} cada dia. El agua destilada se utiliza para producir hortalizas (primordialmente rabanos, calabazas y tomates) en una parcela experimental de alta eficiencia de empleo del agua, que permite obtener producto fresco del orden de 1 kg de rabanos por cada 10 litros de agua destilada en 30 dias, o 1 kg de tomate por cada 200 litros de agua en 150 dias

  10. Sistema automatizado de aquecimento solar para controle de fitopatógenos da água de irrigação Automatic solar heating system for control of pathogens in irrigation water

    Carlos A. da S. Braga

    2001-05-01

    Full Text Available O sistema automatizado de aquecimento solar, baseou-se em um processo misto de aquecimento da água em circuito fechado, através de coletores planos e dois princípios integrados de transmissão de calor, um por convecção natural e o outro por convecção forçada. A automatização foi realizada por monitores termostáticos diferenciais. Os testes normativos abrangeram as temperaturas programadas de 50, 55 e 60 ºC, que contemplam a faixa de temperatura letal para a maioria dos fitopatógenos. Os resultados indicaram rendimentos térmicos da ordem de 63, 55 e 52%, superiores, quando comparados aos rendimentos médios de 50, 47 e 45% dos sistemas convencionais. Os resultados experimentais mostraram que o sistema é eficiente para a eliminação de patógenos da água de irrigação, sendo promissor como uma opção de baixo custo para ser usado em viveiros, casas-de-vegetação e pequenas ou médias propriedades agrícolas.In the system proposed, which uses flat collectors, both natural and forced convection are responsible for the transfer of heat to the circulating water. The automation of the system is performed by thermostats, placed in different places, electrically connected to other components like valves and a water pump. Under identical test conditions and in the range of temperatures considered (50, 55 and 60 ºC, which includes the reference lethal temperature range for pathogens, the thermal efficiencies attained were 63, 55 and 52%, which compare favorably with those obtained in conventional systems, these being 50, 47 and 42% respectively, as reported. The results of the experimental trials show that the system described is a viable option to eliminate pathogens present in irrigation water, while its low cost makes it attractive for use in nurseries, greenhouses and on small farms.

  11. Proyecto de instalación de energía solar térmica para producción de agua caliente sanitaria en edificio de 12 viviendas

    Llorente Costelo, Juan

    2012-01-01

    Estudio y desarrollo de una instalación de energía solar térmica para dotar de agua caliente sanitaria a una edificación constituida por 12 viviendas, incluyendo todos los cálculos necesarios así como el presupuesto económico Escuela Técnica Superior de Ingeniería de Telecomunicación Universidad Politécnica de Cartagena

  12. Propiedades Termofísicas de nuevos fluidos de trabajo (H2O+LiBr+LiNO3+LiC1, NH3+H2O y NH3+H2O+KOH) para sistemas de refrigeración por absorción

    Salavera Muñoz, Daniel

    2005-01-01

    El incremento de la demanda energética, que acompaña al crecimiento experimentado por la economía mundial en las últimas décadas, obliga a la búsqueda de tecnologías más eficientes que permitan mitigar los efectos negativos que sobre el medio ambiente causa este crecimiento.En España, una de las principales demandas energéticas se produce en los meses estivales, debido al aumento de aparatos de aire acondicionado. Para reducir esta demanda, la refrigeración por absorción activada por energí...

  13. Estudio de viabilidad para la implantación de una huerta solar en el municipio de Torrecillas de la Tiesa, Cáceres

    Vázquez Sánchez, Jose J.

    2009-01-01

    En el siguiente proyecto final de carrera se estudia la viabilidad para implantar una instalación fotovoltaica sobre un terreno en propiedad situado en Cáceres. El objetivo es escoger el tipo de instalación fotovoltaica más rentable para esta ubicación. Para ello se desarrolla un modelo para estudiar los diferentes tipos de instalaciones fotovoltaicas partiendo de una instalación tipo de 100kW para comprobar las diferencias en generación eléctrica. Los diferentes tipos de in...

  14. Diseño de sistemas de energía solar fotovoltaica para usuarios residenciales en Chía, Cundinamarca

    Ana Katherine Rodríguez Manrique

    2015-06-01

    Full Text Available En este documento presentamos un análisis técnico y económico para el uso residencial de sistemas fotovoltaicos interconectados a la red eléctrica (BIPVS por sus siglas en inglés para usuarios estrato 6 en el municipio de Chía, Cundinamarca. Los estudios fueron realizados para tres tipos de vivienda de una constructora para cubrir el 100 %, 70 % y 40 % de los perfiles de carga de las viviendas. Los resultados indican que, gracias a las nuevas políticas gubernamentales (Ley 1715 de 2014 para incentivar tecnologías de generación no convencional, la recuperación de la inversión inicial del proyecto con las condiciones actuales puede llevarse a cabo en alrededor de 7 años y medio para el 100 % de la demanda residencial analizada.

  15. Diseño de sistemas de energía solar fotovoltaica para usuarios residenciales en Chía, Cundinamarca

    Ana Katherine Rodríguez Manrique; Ángela Inés Cadena Monroy; Andrés Julián Aristizábal Cardona

    2015-01-01

    En este documento presentamos un análisis técnico y económico para el uso residencial de sistemas fotovoltaicos interconectados a la red eléctrica (BIPVS por sus siglas en inglés) para usuarios estrato 6 en el municipio de Chía, Cundinamarca. Los estudios fueron realizados para tres tipos de vivienda de una constructora para cubrir el 100 %, 70 % y 40 % de los perfiles de carga de las viviendas. Los resultados indican que, gracias a las nuevas políticas gubernamentales (Ley 1715 de ...

  16. Implementación de método Heliosat para la estimación de la radiación solar a partir de imágenes de satélite

    Olcoz Larrayoz, Asier

    2014-01-01

    El objetivo del proyecto es la implementación de los algoritmos de la última versión disponible del método Heliosat para estimar la radiación solar a partir de las imágenes de satélite. En la actualidad, CENER tiene implementada una combinación que emplea partes del Heliosat-1 y Heliosat-2 a tal efecto. En primer lugar se realiza una búsqueda bibliográfica para determinar cuál es la versión publicada más reciente del algoritmo. A continuación se implementa en lenguaje de progra...

  17. Importância da seed-layer na preparação e eficiência de nanoestruturas de ZnO para aplicação em células solares

    Samora, Maria José de Carvalho Gonçalves

    2014-01-01

    A pesquisa de células solares com melhor eficiência, menor preço, menor tamanho e maior segurança ambiental, fundamenta o estudo de novos materiais semicondutores. O trabalho em curso, incide sobre as melhores condições de síntese por via eletroquímica de filmes de ZnO nanoestruturado, considerando o seu baixo custo e devido às suas propriedades para aplicação como aceitador de eletrões. Num substrato de vidro revestido com óxido de estanho dopado com fluor, a partir de um eletrólito ...

  18. Choice and the cost and benefit analysis of one solar system of renewable energy for the Tepozan Park; Seleccion y analisis costo-beneficio de un sistema de energia renovable para el parque Tepozan

    Lopez P, J. Manuel A; Sheinbaum P, Claudia [Instituto de Ingenieria de la UNAM, Mexico, D. F. (Mexico)

    2000-07-01

    This article is about the choice process and the cost and benefit analysis of one solar photovoltaic system for the Tepozan Park, which is a space of ecoturism and ecological education, it is at the Tlalpan District in Mexico, D.F. According to this objective, we start with an introduction related to general conditions in the Park and we talk about the energy requirement. Next, the method for the better option choice is shown, this is based on decision analysis of Kepner and Tregoe. The choice option is evaluated according to the main financial tools of the Cost and Benefit Analysis private evaluation. This shows the decision analysis including issued about ecology. Finally, we add a point for the result synthesis, so we can have a complete approach in order to choice a renewable energy. As conclusion is shown the most important costs and benefits, thinking on future decisions about operation and maintenance of the system. [Spanish] En este articulo se presenta el proceso de seleccion y analisis Costo-Beneficio de un sistema de energia solar fotovoltaica para las instalaciones del Parque Tepozan, un espacio de ecoturismo y educacion ambiental, ubicado en la delegacion Tlalpan de Mexico, D.F. Para ello, se da una introduccion de las condiciones generales del parque y de los requerimientos de energia. Posteriormente se presenta un apartado del metodo para la seleccion de la alternativa mas adecuada, sustentado en un analisis de decisiones. La alternativa seleccionada, se somete a una evaluacion de los principales criterios de la evaluacion privada derivada del Analisis Costo Beneficio, con lo que se ilustra el proceso de toma de decision, incluyendo los factores de impacto ambiental. Finalmente, se incorpora un apartado de sintesis de resultados, para aportar un panorama completo en cuanto a la operacion y mantenimiento del sistema dentro del parque.

  19. Viento, sol y tecnologías sostenibles para la producción de alimentos agrícolas. Wind, solar and sustainable technologies for agricultural food production.

    Benito Yuniel Benito Zamora Galbán

    2012-05-01

    Full Text Available La producción de alimentos agrícolas presenta diferentes barreras desde la necesidad de suelos fértiles, cantidad de agua, laboreo, condiciones climáticas adecuadas, rudeza de las condiciones laborales, secado de los productos para su conservación hasta la posibilidad de la fuerza de trabajo disponible. Actualmente, el hombre, mediante el uso de las tecnologías ha podido crear condiciones naturales modificadas para manipular los factores adversos para el desarrollo adecuado, el presente artículo, constituye una propuesta de la anterior afirmación. Se parte de propuestas de tecnologías conocidas internacionalmente, como torre solar eólica, el secado solar y el cultivo en invernadero, las dos primeras  no tan bien conocidas como el cultivo intensivo y controlado usado tanto en países cálidos como en templados, dichas tecnologías unidas a la existencia de chimeneas abandonadas de los centrales azucareros cubanos y fuerza de trabajo disponible alrededor de la antigua industria, permiten la posibilidad de una segura y estable producción agrícola, incluido el secado de sus productos. El antecedente investigativo del presente artículo es la tesis de diploma del ingeniero Zamora Galbán, e inclusive constituye una continuación a su primera recomendación de implementación del secado solar de productos agrícolas, alrededor de las chimeneas abandonadas. Se desarrollan ideas tecnológicas de producción en el invernadero acoplado a una torre solar eólica, lo cual en la situación actual en Cuba de los centros dedicados con anterioridad a la producción de azúcar que mantengan chimeneas pudiera ser un uso productivo con su adaptación como torre solar eólica con invernadero. 

  20. Current status of the second generation of parabolic trough solar concentrator for heat generation process designed at the IIE; Estado actual de la segunda generacion del concentrador solar de canal parabolico para generacion de calor de proceso disenado en el IIE

    Ramos Berumen, Carlos; Ramirez Benitez, Juan Rafael; Beltran Adan, Jose [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: cramos@iie.org.mx; rramirez@iie.org.mx; jose.beltran@iie.org.mx

    2010-11-15

    The transformation industry normally uses thermal energy within its process, it obtains this energy burning fossils fuel, a new option is to use new technologies like the thermal solar technology like the parabolic trough, this is a long parabolic mirror used to reflect the sunlight and focused on an absorber tube with a heat-conducting fluid inside. The Instituto de Investigaciones Electricas (IIE) developed a prototype of parabolic trough that is operating in different industries, in this article are showing some improvements to the design, giving like result the second generation of the prototype of parabolic trough of the IIE. [Spanish] La industria de la transformacion normalmente utiliza energia termica dentro de su proceso, los medios convencionales para obtener esta energia es el quemar combustibles fosiles, una opcion que aplica nuevas tecnologias es el uso de la tecnologia termosolar a concentracion que le permitira a la industria utilizar el sol como fuente de energia primaria. El uso de esta tecnologia permitira a las empresas generar calor de proceso sin contaminar el ambiente, lo que dara como resultado empresas competitivas y autosuficientes. Para alcanzar temperaturas utiles a estas aplicaciones se requiere concentrar la energia solar en un area mas pequena, siendo la tecnologia mas extendida la de canal parabolico, el principio de operacion de esta tecnologia es la de concentrar la radiacion solar en el eje receptor preparado con una pintura especial para una mejor absorcion del calor y una cubierta de vidrio para evitar perdidas termicas, dentro del tubo circula un fluido caloportador el cual lleva el calor util hacia el proceso. El Instituto de Investigaciones Electricas (IIE) desarrollo un prototipo de canal parabolico, actualmente estan operando en diferentes industrias, resultado de estas aplicaciones se llevo a cabo una evaluacion del prototipo, se detectaron algunos puntos de mejoras al diseno, los cuales se exponen en este articulo, dando

  1. Prospective of the photovoltaic solar technology for electricity generation (Annexe 7 in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Prospectiva de la tecnologia solar fotovoltaica para la generacion de electricidad (Anexo 7 en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Agredano Diaz, Jaime [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-08-15

    The first experience where it was found the relationship between the light of the sun and its conversion to electricity was reported by the French physicist Edmund Bequerel in 1839, nevertheless the development of the modern photovoltaic cell, as it is known now, occurred until the middle of the last century in the Bell labs of the United States, that in year 1955 presented the first patent of photovoltaic silicon cells. The main elements of a photovoltaic system are: the photovoltaic cells, (some times referred to as solar cells), interconnected and encapsulated to form one photovoltaic module, the structure of assembly for the module or modules, the inversor (essential for systems connected to the network and for systems outside the network that require provision of alternating current), storage battery and a load controller (required solely for systems outside the network). [Spanish] La primera experiencia donde se encontro la relacion entre la luz del sol y su conversion a electricidad la reporto el fisico Frances Edmund Bequerel en 1839, sin embargo el desarrollo de la celda fotovoltaica moderna tal y como se conoce ahora, se dio hasta mediados del siglo pasado en los laboratorios Bell en los Estados Unidos, quienes en 1955 presentaron la primera patente de celdas fotovoltaicas de silicio. Los elementos principales de un sistema fotovoltaico son: las celdas fotovoltaicas, (algunas veces referidas como celdas solares), interconectadas y encapsuladas para formar un modulo fotovoltaico, la estructura de montaje para el modulo o modulos, el inversor (esencial para sistemas conectados a red y necesario para sistemas fuera de red que requieren suministro de corriente alterna), bateria de almacenamiento y un controlador de carga (requerido unicamente para sistemas fuera de red).

  2. Construction of a pilot plant of 500 KW it solar gasification of coke of oil. Synpet project; Construccion de una planta piloto de 500 kW para la gasificacion solar de coke de petroleo. Proyecto Synpet

    Vidal; Denk, T.; Valverde, A.; Steinfeld, A.; Zacarias, L.; Jesus, J. C. de; Romero, M.

    2008-07-01

    Solar thermochemistry is a novel and very promising route for the production of valuable fuels and chemicals, in which solar energy is collected and concentrated in order to supply the high temperature process heat necessary to drive highly endothermic chemical reactions. Some high temperature endothermic reactions for converting solar energy to chemical fuels have been investigated; the steam-gasification of petroleum derivatives and residues using concentrated solar radiation has been proposed more recently as a viable alternative to solar hydrogen production. This paper reviews this study which is being carried out within collaboration between Petroleos de Venezuela (PDVSA), the Eidgenossische Technische Hochschule (ETH) in Zurich/Switzerland, and the CIEMAT in Spain to study the feasibility of thermochemical falsification form petroleum coke. (Author)

  3. Aperfeiçoamento da produção de partículas de óxido de zinco para aplicação em células solares

    G. A. R. Maia

    2016-03-01

    Full Text Available Resumo O óxido de zinco (ZnO nanoestruturado contém características físico-químicas de elevada importância para utilização em células solares. A padronização e regularidade das dimensões das partículas nanométricas é de difícil obtenção; fatores como natureza do ânion do sal precursor, temperatura de reação e quantidade de água podem interferir no tamanho das partículas. Este trabalho tem como objetivo estudar a influência das variáveis do processo de síntese das nanopartículas de ZnO, visando a aplicabilidade em células solares. Foi aplicado delineamento fatorial incompleto Box-Behnken (33, de acordo com o método de coprecipitação, para as três variáveis: concentração de Zn(NO32 (mol.L-1, temperatura do meio reacional (°C e tempo de reação (h. Para caracterização das partículas foram feitas medidas de espalhamento de luz, análise por difração de raios X, caracterização por espectroscopia Raman, microscopia eletrônica de varredura (MEV, aplicação do ZnO em célula solar com polímero (poli-3-hexiltiofeno - P3HT e medidas de fotocronoamperometria. A otimização resultou em uma concentração de Zn(NO32 igual a 0,05 mol.L-1, tempo de reação de 20 h e temperatura de 80 ºC, onde o menor valor para o tamanho de partícula de ZnO mostrado pelo modelo foi de 367 nm. As nanopartículas apresentaram cristalito com dimensões de 20 nm, cristalinidade de 82,4% e fase hexagonal do tipo wurtzita. As imagens de MEV mostraram três tipos diferentes de estruturas devido à variação de concentração do Zn(NO32. A amostra de ZnO370nm + P3HT + FTO apresentou valor de densidade de corrente (j de 3,86 mA.cm-2.

  4. Smart Grid y la energía solar fotovoltaica para la generación distribuida: unarevisión en el contexto energético mundial

    Luis Humberto Berrío

    2014-01-01

    Full Text Available La Red Inteligente, considerada la siguiente generación de la red eléctrica tradicional, tiene entre sus objetivos la integración de fuentes de energía renovables. Por su parte, la demanda energética actual obliga a buscar nuevas formas de generación de energía, entre las cuales las fuentes de energía renovable están teniendo gran acogida, ya que son formas alter - nativas de generación de energía diferentes a las fuentes convencionales y no contaminan el medio ambiente. De hecho, este estudio aborda el tema de las energías renovables, y hace especial énfasis en los sistemas fotovoltaicos, que son una tecnología promisoria para generar energía eléctrica a partir de la energía solar. Además se muestra el contexto actual y los escenarios futuros de la utilización de la energía solar en el mundo, tanto en la parte técnica como en el campo económico, regulatorio y social. Las políticas de Estado y las reducciones en los costos de las tecnologías determinarán qué tanto demorará la migración a las redes inteligentes. Los resultados de esta investigación muestran no solo la necesidad de un marco regulatorio en cuanto a generación distribuida a partir de energías renovables, sino cómo la energía solar fotovoltaica, potenciada dentro de las redes inteligentes, está siendo considerada una alternativa eficiente y económica para la generación de energía, utilizada cada vez más a nivel mundial.

  5. Hydro Solar 21- A building energetic demand providing system based on renewable energies and hydrogen; Hydro Solar 21- Energias renovables e hidrogeno para el abastecimiento energetico de un edificio

    Renilla Collado, R.; Ortega Izquierdo, M.

    2008-07-01

    Hydro Solar 21 is an energy innovation Project carried out in Burgos City to develop an energy production system based on renewable energies to satisfy light and air condition requirements of a restored building. Nocturnal light demand is satisfied with hydrogen consumption in fuel cells. This hydrogen is produced with an energy renewable system made up of two wind turbine generators and a photovoltaic system. The air conditioning demand is satisfied with an adsorption solar system which produces cold water using thermal solar energy. (Author) 8 refs.

  6. Solar Thermal Energy: Let the sunshine in! A renewable source for industrial processes Title: La energía solar térmica: ¡Deja que entre el sol! Un recurso renovable para los procesos industriales

    Angel Bohorquez Colombo

    2013-01-01

    Solar thermal energy is an important renewable resource that can be employed effectively in industrial processes. Together with residential and commercial applications, there is great growth potential for this energy technology for industrial uses. This natural and viable source of energy generation provides a solution for industries requiring heat in their processes in many parts of the world. This guide to solar thermal energy will provide an introduction to the topic as well as information...

  7. Computerized system for energy diagnosis in domestic users; Sistema computarizado para diagnostico energetico en usuarios domesticos

    Ramos N, Gaudencio; Heard, Cristopher; Fiscal E, Raul; Maqueda Z, Martin [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    The scope of a computerized system is presented to make an energy diagnosis to homes and a simulation of scenarios of cost/benefit, due to the implementation of energy saving measures and the efficient use of electrical energy. The FIPATERM (trust for the heat insulation of the house in Mexicali), provides economic and technical support so that the domestic users diminish their expense for the electrical energy, implementing programs of Demand Side Management (DSM). The current effective programs are: thermal insulation, substitution of the existent air conditioning units for efficient ones, reduction of infiltration, leveled plan of payments, interruption of the air conditioning equipment. In order to participate in one or several of the programs of energy efficiency, an energy diagnosis is made to the user. It is from a survey of the equipment and characteristics of the house, as well as a description on the part of the user of his habits of use of the equipment, that scenarios are simulated, which allow the user to identify the most profitable measures. [Spanish] Se presenta el alcance de un sistema computarizado para realizar diagnostico energetico a casas habitacion y simulacion de escenarios de beneficio/costo, debido a la implantacion de medidas de ahorro y uso eficiente de energia electrica. El FIPATERM (fideicomiso para el aislamiento termico de la vivienda en Mexicali), proporciona apoyo economico y tecnico para que los usuarios domesticos minimicen su gasto de energia electrica, implementando programas de Administracion por el Lado de la Demanda (ALD). Los programas actualmente vigentes son: aislamiento termico, sustitucion del aire acondicionado actual por uno eficiente, reduccion de infiltracion, plan nivelado de pagos, interrupcion del equipo de aire acondicionado. Para participar en uno o varios de los programas de eficiencia energetica, al usuario se le realiza un diagnostico energetico. Es a partir de una encuesta del equipamiento y caracteristicas

  8. Evaluación de la energía térmica solar para generación de electricidad mediante un sistema Stirling en Huancayo

    Juan Cámac Núñez; Jacinto Arroyo Aliaga; Luis Astuhuaman Artica

    2015-01-01

    El objetivo fue determinar de qué manera influye la radiación solar en la generación de energía eléctrica en la ciudad de Huancayo, usando un sistema de generación eléctrica basado en un motor Stirling. Se describe las características de la energía solar en estas coordenadas del centro del Perú y las características de conversión de radiación solar en energía eléctrica. La investigación tuvo un diseño experimental, se implementó un sistema de generación eléctrica basado en el diseño de un col...

  9. Estudio para la instalación de un generador solar fotovoltaico conectado a red sobre la cubierta de una nave industrial

    Bilbao Larrauri, Javier

    2013-01-01

    En el presente proyecto se pretende realizar el diseño y estudio de un parque solar fotovoltaico de 54,39 kWp con conexión a red montado sobre la cubierta de una nave industrial y ensamblada a ésta a través de una estructura de aluminio que confiere una inclinación fija a los paneles solares de 28º con respecto a la horizontal y una orientación Sur (azimut de 6º) con respecto a los meridianos. La nave se encuentra situada en el término municipal de Arganda Del Rey en la prov...

  10. Metodologia em projeto de bloqueador de radiação solar (brises com estrutura móvel pivotante para conforto ambiental em aviários

    Angélica Felicidade Guião Marcato Costa

    2009-01-01

    Full Text Available Among agriculture cultures in Brazil, aviculture is getting more important every year. Nowadays, it is in second place in supply of animal protein for human consumption. With the increase of necessity, the vivarium of birds tend to advance in the treating of birds. The concern about the environmental comfort of the animals is directly related to the increment of productivity in weight and eggs. In this work, it is proposed a methodology for a project of solar radiation blocker with rotative structure to impede the incidence of solar radiation and the heat gain where the animals are confined, using this illumination for the environmental comfort.

  11. Estudio de Viabilidad de los Paneles de Energía Solar como Fuente de Ingresos para las Empresas de los Polígonos Industriales de Gandia

    GREGORI PEIRÓ, JUAN JESÚS

    2013-01-01

    En este proyecto se va a realizar un estudio sobre la viabilidad de la instalación de placas solares en los techos de las empresas de los polígonos industriales, en concreto en las empresas del polígono Alcodar de Gandía. Todos los puntos que iré explicando a lo largo del proyecto tienen como fin entender las energías renovables y la solar en concreto y su uso sostenible. En las últimas décadas el crecimiento demográfico y la industrialización del planeta hacen insostenibles el uso continu...

  12. Solar Physics Topics in High School: Analysis of a Course with Practical Activities at Dietrich Schiel Observatory. (Spanish Title: Temas de Física Solar Para Estudiantes de Escuelas Secundarias: un Análisis de un Curso con Enfoque Práctico en el Observatorio Dietrich Schiel.) Tópicos de Física Solar no Ensino Médio: Análise de um Curso com Atividades Práticas no Observatório Dietrich Schiel

    Calbo Aroca, Silvia; Donizete Colombo, Pedro, Jr.; Celestino Silva, Cibelle

    2012-12-01

    This work analyses results obtained in a solar physics course for high school students promoted at the Dietrich Schiel Observatory of the University of São Paulo (USP). The course was elaborated by the authors with the intention of investigating student's concepts about the Sun, teaching topics of modern physics related to the Sun and providing students with knowledge about our star as well. The methodology of data gathering consisted of audio and video records of classes and of semi-structured interviews, and analysis of answers to written questionnaires. The results showed that most high school students conceived the Sun as made of fire, while sunspots were thought to be holes in the Sun. Even though some students did know that a spectrum is formed using a prism or diffraction grating, most of them ignored the nature of the observed spectral lines. Through the course, this topic was developed by means of a practical approach with solar and lamp spectra observations. The results obtained in the course point to the importance of science centers as partners in formal education. In this specific case, the Solar Room at the Dietrich Schiel Observatory is as a favorable environment for teaching modern physics in high school. Este artículo analiza los resultados obtenidos en un curso sobre la física solar, auspiciado por el Observatorio Dietrich Schiel de la USP para estudiantes de las escuelas secundarias. El curso fue diseñado por los autores con la intención de investigar las concepciones sobre el sol, enseñar temas relacionados con la física moderna del Sol y conocimientos generales sobre el astro rey. La metodología utilizada para la recolección de datos consistió en grabar, en audio y video, las clases, las entrevistas semi-estructuradas y las respuestas a los cuestionarios escritos. Los resultados mostraron que la mayoría de los participantes conciben el Sol como constituido por fuego y las manchas solares en la superficie solar como agujeros. Aunque

  13. Diseño e implementación de un sistema de adquisición de datos para medir potencia solar local

    Joe Alexander Jiménez Herrera

    2006-05-01

    Full Text Available El presente trabajo versa sobre la medición de las componentes directa, difusa y global de la radiación solar, a través de piranómetros, con el debido acondicionamiento de las señales y digitalización de las mismas en el microprocesador HCS12. El almacenamiento de los datos se efectúa mediante memorias I2C, logrando una capacidad de captura de 13 días aproximadamente, almacenando tres datos por minuto durante el "día Solar". Además de contar, con una interfaz de visualización y comunicación serial constituida por un PC, un LCD y un teclado, con el cual permite modificar los parámetros del sistema. / The present work deals with the measurement of the direct, global and diffuse components of the solar radiation, through pyranometers, with the signs adaptation right and the digitalization of them in the microprocessor HCS12. The data storage is effected through memories I2C, achieving a capture capacity of 13 days approximately, storing 3 data by minute during the "solar day". Besides, it counts with a visualization and serial communication interface constituted by a PC, a LCD and a keyboard with which it allows modifying the system parameters.

  14. Analysis of the feasibility of solar heating systems composite for packaging recyclable for use in rural low income; Analise da viabilidade economica de sistemas de aquecedores solares compostos por embalagens reciclaveis para utilizacao em comunidades rurais de baixa renda

    Gabriel Filho, Luis Roberto Almeida; Maiochi, Tamara; Pereira, Danilo F.; Magalhaes, Marcelo M. de [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Tupa, SP (Brazil)], email: gabrielfilho@tupa.unesp.br; Cremasco, Camila P. [Faculdade de Tecnologia (FATEC), Presidente Prudente, SP (Brazil); Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Dept. de Bioestatistica

    2011-07-01

    Solar heaters are an appropriate technology for tropical and sub tropical to warm bath water through the energy in sunlight. The development of conventional solar heaters is in the market and its acceptance is still low due to high cost. However, low-cost solar heaters have been developed in recent years to meet a consumer demand that currently do not have access to this technology, especially low-income rural communities. The aim of this study was to analyze the economic feasibility of solar water heaters built with recyclable materials (plastic bottles and milk cartons) through the consequent reduction of sales of electricity. For development work, a heater was built with recyclable materials in accordance with the manuals provided by the Department of the Environment of Parana (SEMA) and found time to use electric showers by families of rural properties in order to determine the costs and billing of electricity. By spending on materials, we concluded that the system was feasible, with amortization over 13 months in fixed installments of R$ 23.79. (author)

  15. The solar and/or wind energy complementing the GRU (Ground Return monofilar): an alternative for the rural development; A energia solar e/ou eolica complementando o sistema MRT: uma alternativa para o desenvolvimento rural

    Reis, Lineu Belico; Fadigas, Eliane Aparecida Faria Amaral; Udaeta, Miguel Edgar Morales [Sao Paulo Univ., SP (Brazil). Escola Politecnica. Dept. de Energia e Automacao Eletrica

    1994-07-01

    This work presents a proposal for an particular alternative configuring the utilization of the GRU system, complemented by the photovoltaic solar and/or wind systems for supplying the rural areas necessities in less favoured regions, with difficult access and low income distribution. This implementation aims to provide a sustained development to those regions.

  16. Diseño y análisis operativo de un aerocondensador para una planta solar térmica de 50MW

    Fernández Martínez, Estefanía

    2012-01-01

    El acceso a la energía es un pilar básico para el desarrollo económico y para la calidad de vida de las personas. En los países desarrollados, en los que el acceso a la electricidad está garantizado, los desafíos del sector tienen que ver con la calidad, coste e impacto ambiental de esta energía. En concreto en España, la dependencia de energía primaria del exterior es superior al 70 %, por lo que el desarrollo de las energías renovables está cobrando una gran importancia. Además de la energí...

  17. Integración arquitectónica de colectores solares térmicos cerámicos para clima mediterráneo

    Roviras Miñana, Jordi

    2013-01-01

    El treball està enfocat a demostrar la viabilitat tècnic-arquitectònica i energètica de col·lectors solars tèrmics realitzats amb materials ceràmics i adequats al clima mediterrani. La importància del consum d’energia en relació amb els problemes del medi ambient i l’esgotament dels recursos naturals ha incrementat el foment i la captació d’energia mitjançant altres tipus de fonts, com les renovables. Dins de les energies renovables la solar és potser la més destacada i la que és ...

  18. CÉLULAS SOLARES SENSIBILIZADAS POR CORANTES NATURAIS: UM EXPERIMENTO INTRODUTÓRIO SOBRE ENERGIA RENOVÁVEL PARA ALUNOS DE GRADUAÇÃO

    Gabriela G. Sonai

    2015-12-01

    Full Text Available An interesting practical experiment about the preparation of dye–sensitized solar cells (DSSC using natural dyes were carried out by the undergraduate students in the chemistry course at UNICAMP . Natural dyes were extracted from blueberries (Vaccinium myrtillus L., jabuticabas (Myrciaria cauliflora, raw and cooked beets (Beta vulgaris L., and annattos (Bixa orellana L., which were used to sensitize TiO2 films that composed the photoanode in the DSSC. A polymer electrolyte containing an iodide/triiodide redox couple was used in lieu of the use of liquid solutions to prevent any leakage in the devices. A maximum solar-to-electric energy conversion of 0.26 ± 0.02% was obtained for the solar cell prepared with annatto extracts. This experiment was an effective way to illustrate to the undergraduate students how to apply some of the chemical concepts that they learned during their chemistry course to produce electric energy from a clean and renewable energy source. Teachers could also exploit the basics of the electronic transitions in inorganic and organic compounds (e.g., metal-to-ligand charge transfer and ϖ-ϖ* transitions, thermodynamics (e.g., Gibbs free energy, acid–base reactions in the oxide solid surface and electrolyte, and band theory (i.e., the importance of the Fermi level energy.

  19. Efeitos do grau de cozimento na qualidade de cortes de Supraspinatus acondicionado a vácuo em embalagem cook-in Effects of cooking degree on quality of vacuum-packed Supraspinatus cuts

    José Ricardo Gonçalves

    2005-06-01

    Full Text Available Foi estudado o efeito do grau de cozimento na cor, perda de peso e força de cisalhamento em cortes no músculo Supraspinatus. Os músculos foram excisados de 18 meias-carcaças de Nelore e pesados antes e após retirada do excesso de tecido conjuntivo externo para cálculo de rendimento (porção comestível. Em cada corte foram medidos o pH final e a cor, fazendo-se, individualmente, o acondicionamento em embalagens tipo cook-in. O cozimento foi feito em tacho com água observando-se as temperaturas internas finais (ponto frio correspondentes ao cozimento "mal-passado", "ao ponto" e "bem-passado" e tempos de cozimento estimados, previamente, para promover a pasteurização (respectivamente, 60-62 ºC/300min, 70-72 ºC/120min. e 75-77 ºC/90min. Para cada tratamento foram destinados 6 músculos de pesos similares. Os dados obtidos indicam que a cor produto "mal-passado" foi ligeiramente mais vermelha que a do produto "ao ponto", mas o produto "bem-passado" foi fortemente afetado pelo tratamento. Como era esperado, o produto "bem-passado" apresentou maior perda de peso na cocção em relação aos produtos "ao ponto" e "mal-passado" (34,07, 24,83, e 21,66%, respectivamente. Os valores da força de cisalhamento aumentaram do produto "malpassado" para o "bem-passado" (4,71, 5,57, e 6,03kgf, respectivamente, sendo o "mal-passado" classificado como macio.The effects of the degree of cooking on color, cooking weight loss and shear force of beef supraspinatus muscle was evaluated. The muscles were extracted from eighteen Nellore carcasses sides without trimming. Each muscle was weighed before and after trimming to estimate the yield. The ultimate pH and color were achieved in the fresh cuts. The cuts were individually vacuum packed into cook-in bags and placed in a water bath in order to obtain the rare, medium and welldone final temperatures (coldest point and pasteurized products. Each treatment was performed on groups of six muscles of similar

  20. Decosol Project : development of solar plate collectors of high efficiency and low cost for medium temperature application; Proyecto Decosol: Desarrollo de colectores solares planos de alta eficiencia ybajo coste para aplicaciones a mediana temperatura

    Cadafalch, J.; Oliva, A.; Lavandeira, J. C.; Maestre, F.; Martinez, J. C.; Martin, J. R.; Hermo, R.

    2004-07-01

    Work that is currently being carried out by the authors in the framework of the project DECOSOL (Development of high efficiency and low cost flat plate collectors for medium temperature applications) is described in this paper. The goal of DECOSOL is to consolidate the results of previous R AND D projects conducted by the authors on the development of stagnation proof transparently insulated flat plate solar collectors prototypes, in order to end up with commercial products. (Author)

  1. Producción de hidrógeno on-site para automoción a partir de energía solar fotovoltaica

    MARGAIX PIQUER, VICENTE

    2016-01-01

    Estudiar la viabilidad de suministrar hidrógeno en la red actual de gasolineras, en la primera fase de introducción del vehículo con pila de combustible alimentada con este gas. Demostrar que se puede producir hidrógeno en las actuales gasolineras, “in situ”, a un precio lo suficientemente competitivo. Desarrollar un proyecto de instalación de una pequeña central fotovoltaica con seguimiento a dos ejes, adaptable a cualquier gasolinera, que genere la suficiente electricidad para alimentar un...

  2. Energía solar térmica y fotovoltaica aislada para pequeñas comunidades en Perú

    Piriz Sagahon, Imanol Yalli Atahualpa

    2013-01-01

    El desarrollo de este proyecto se hizo gracias al apoyo económico del Centro de Cooperación al Desarrollo (CCD) y del Programa de Educación en Ciencia y Tecnología del Agua para la Población Infanto-juvenil de Perú PCIAECID (A1-035941-11). El apoyo en logística e instalaciones por parte del Departamento de Ordenamiento Territorial y Desarrollo Sostenible de la Universidad Nacional Agraria La Molina. El presente trabajo final de master esta orientado al diseño y la implement...

  3. Proyecto de ejecución de planta solar fotovoltaica de 2mw sobre cubierta denominada "puertas tht", para el suministro de una zona industrial

    Moreno de la Santa Rubio, Fernando

    2011-01-01

    El objeto del presente Proyecto es la descripción, dimensionado, justificación y legalización de las instalaciones eléctricas en baja tensión, tanto de corriente continua, como de corriente alterna, instalaciones de telegestión e instalaciones de seguridad, de la energía eléctrica generada por un Parque Solar Fotovoltaico. Al mismo tiempo, se pretende demostrar ante los Organismos Competentes que la instalación que nos ocupa reúne las condiciones y garantías mínimas exigidas por la reglamenta...

  4. Estructura de bicapas Mo/CuInSe2 para células solares de lámina delgada

    Herrero, J; Guillén, C.

    2004-01-01

    The optimization of the structural and morphological characteristics of the system constituted by molibdenum and copper indium diselenide layers deposited onto glass substrates (glass/Mo/CuInSe2) is essential for its application in efficient thin film solar cells. For developing such kind of systems, soda-lime glass substrates have been used to prepare Mo thin films by evaporation at deposition rates between 4 and 13 Å/s, and subsequently CuInSe2 layers by direct electrodeposition at 12 Å/s c...

  5. Diseño de sistema de orientación automática para energía solar

    Sánchez Alvarado, Ignacio

    2015-01-01

    El sistema energético mundial actual es insostenible a largo plazo debido a la fuerte presencia de los combustibles fósiles. Es por ello que se está llevando a cabo gradualmente un proceso de cambio de modelo energético, teniendo como base la incorporación de las energías renovables. Dentro de este tipo de energías la energía solar, tanto fotovoltaica como de concentración, es una de las tecnologías con más crecimiento y potencial en el futuro. Las mejoras en materiales y dispositivos en ener...

  6. Diseño e implementación de un sistema electrónico de control para seguimiento solar de paneles fotovoltaicos

    Santos Soares, Caique dos; Quesada Rodríguez, David

    2014-01-01

    Un dels grans desafiaments que assetja la societat actual és l'escassetat d'un sistema eficient d'adquisició d'energia neta a partir de recursos energètics renovables. Aquest projecte s'ha centrat en la creació d'un sistema d'optimització d'adquisició d'energia per panells fotovoltaics . Els panells fotovoltaics generen una màxima eficiència energètica quan la radiació solar incideix de forma perpendicular al mateix. Si aquests panells posseeixen un sistema d'orientació d...

  7. System for electric power generation with photovoltaic solar modules for charging the batteries of an electric wheelchair; Sistema de geracao de energia eletrica com modulos solares fotovoltaicos para o carregamento de baterias de uma cadeira de rodas eletrica

    Mesquita, Rafael Pimenta; Souza, Teofilo Miguel de [Universidade Estadual Paulista (UNESP), Guaratinguta, SP (Brazil). Fac. de Engenharia. Dept. de Engenharia Eletrica], Emails: pimentamesquita@gmail.com, teofilo@feg.unesp.br

    2006-07-01

    Renewable energy is all kind of energy produced from a natural source that not diminish because its utilization is 'renewable'. More and more renewable energy resources are used, because they offer multiple advantages such as the energy output facility in small scale and because they are entirely compatible with the environment. The renewable energy used in this project is the photovoltaic solar energy, obtained by the direct conversion of the solar energy in electric energy through the use of solar cells, that can be of several kinds, being the most common of silicon. The main advantage of photovoltaic system is the generation of clean electric energy, or either, generates energy without emitting pollutant and without destroying the environment, moreover is an inexhaustible source of energy. The main disadvantage is, nowadays, the high cost and its low efficiency, so to continue developing it is necessary establish capable mechanisms to make it possible. The search of these mechanisms of incentive becomes-itself a lot important, because the renewable energy and not conventional do not produce a financial return to the investor properly said, but brings lots of benefits to the community, the society and to the environment. This project has the purpose of create an electric energy generation system through solar photovoltaic modules to carry batteries of a motorized wheelchair. An electric wheelchair is moved by electric motors of direct current that are feed by batteries, permitting a medium autonomy of 10 km by load. The batteries are recharged by a battery supplier. This operation should be carried out daily in a space of 6 to 8 hours. According to the Demographic Census realized in 2000 carried out by the IBGE, Brazil has around 1.416.060 physical deficient, which 861.196 are men and 554.864 are women. From a request of a user of electric wheelchair the idea of this project was shown up. The user complained that he stayed a long time carrying his seat

  8. Estudio comparativo entre una instalación de refrigeración por compresión y una instalación de refrigeración solar para la climatización en verano de una vivienda unifamiliar situada en Cunit (Tarragona)

    Bellés Castaño, Jaime

    2010-01-01

    El presente proyecto de final de carrera trata sobre la realización de una instalación de refrigeración solar para la climatización de los meses verano de una vivienda unifamiliar situada en Cunit. Dicha vivienda consta de tres plantas con una cubierta plana, jardín exterior y piscina. Primeramente se han calculado las necesidades térmicas de refrigeración de la vivienda, para la selección de los componentes de las instalaciones según estas necesidades (se compara una ...

  9. Utilization of solar electric fence for containment of caprine in familiar production of the Pernambuco semi-arid region; Utilizacao de cerca eletrica solar para confinamento de caprinos na producao familiar do semi-arido pernambucano

    Costa, Heitor Scalambrini; Costa Neto, Guilherme [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Nucleo de Apoio a Projetos de Energias Renovaveis], Email: naper@ufpe.br; Araujo, Kassia; Silva, Gerson Flavio da; Raquel, Karine [ONG NAPER SOLAR, Recife, PE (Brazil). Centro de Estudos e Projetos], Email: nsolar@terra.com.br

    2006-07-01

    The Center for Studies and Projects - Naper Solar is an NGO, which works for the dissemination of use of alternative energies resources in the semi-arid Brazilian Northeast in collaboration with the Federal University of Pernambuco. It has implemented caprine raising systems in the back lands of Pajeu in the State of Pernambuco making use of electrified fences energized by solar energy.This project was executed in a joint effort with the City Halls of Afogados da Ingazeira e Sao Jose do Egito and the NGOs Diaconia and the Northeast Woman House and has benefited 20 families of farmers from 9 rural communities. It is funded by a Technical Cooperation Program established between the National Fund for the Environment - Ministry for the Environment and the Netherlands Government. The implemented system, in opposition to the traditional extensive production system, allow for a more animal sanitary control - minimizing the risks of contamination; a more controlled and balanced feeding system - taking into account the weight gaining factor together with pasture management, leading the a guarantee of food supply for the animals. Other advantages of this system include the reduction of fence cost and less deforesting. Electrical fences used in the contention of caprine are built with only 4 straight wires, fixed with isolators on wood posts spaced 10 m from each other, while the conventional fences use 9 barbed-wire lines fixed with clamps on posts spaced 1 m from each other. Therefore, the use of electrical fences instead of the conventional one represent a cost reduction, which can go as high as 40 % of the total cost. Besides that the electrical fences have low maintenance cost, easier and faster installation and relocation. The fenced areas vary from 0.5 ha to 4 ha for the raising of 5 to 50 animals. In the electrification of a fence one needs one photovoltaic module, one electrifier, a battery, isolators (passage and corner), electric ground rods and a thunderbolt

  10. Solar Indices - Solar Corona

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  11. Solar Indices - Solar Flares

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  12. Solar Indices - Solar Irradiance

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  13. Methodology Einstein for energy audit and design of solar heat systems in industrial processes; Metodologia Einstein para auditoria energetica y diseno de sistemas de calor solar en procesos industriales

    Schweiger, H.; Vannoni, C.; Danov, S.; Facci, E.

    2008-07-01

    Estimates show that 57% of the total industrial heat demand in EU countries is required at low (up to 100 degree centigrade) and medium temperature (up to 400 degree centigrade). An important part of this thermal energy demand can be covered by solar thermal energy. In the framework of the European project EINSTEIN (Expert-system for an Intelligent Supply of Thermal Energy in Industry), an expert system is being developed, where process optimisation, heat recovery, intelligent cold supply and renewable energy are integrated into a holistic energy audit methodology with the objective of reducing energy consumption in the industrial sector. EINSTEIN is being developed as a free and open source software project. (Author)

  14. Application for solar thermal facilities evaluation in Asturias (A.V.I.S.T.A); Aplicacion para valoracion de instalaciones solares termica en Asturias (A.V.I.S.T.A.)

    Prieto, J. L.; Aguilera, J. C.; Garcia, D.

    2004-07-01

    The Fundacion Asturiana de la Energia, with the grant of the Consejeria de Industria y Empleo del Principado de Asturias, has recently promoted a software tool to evaluate domestic hot water installations that use solar energy in Asturias. The application is based on numerical simulation methods, thus it provides a knowledge on the influence of several performance parameters, which is interesting not only for tasks of designing but also from the viewpoint of installation controlling. It essentially consists of one utility for preliminary designing, where most parameters are prefixed, and another one for analysing, where the parameters can be modified either to optimize designs or to study existing installations. Complementary utilities are provided for shadow analysing by means of stereographic projection, as well as for preliminary studies of economic feasibility. (Author)

  15. Recommendations and tools to design houses with passive solar cooling and mating in Mediterranean Sea; Recomendaciones y herramientas para el diseno de viviendas con calefaccion solar y climatizacion pasiva en una zona de clima mediterraneo

    Muller, E.

    2004-07-01

    Recommendations for passive design and design tools based on European building codes were developed with extensive thermal simulations and a reference year especially prepared with hourly climate data from the central region of Chile. The results of the research were presented as a manual in Spanish enclosing simple design tools in an electronic spreadsheet. The design analysis is presented with a novel approach, that permits a better understanding and optimisation of the complex design balance between the demands for summer and winter in a mediterranean climate. The methodologies and approach that were developed are extended to other climatic regions. This way the investigation supports the improvement of thermal comfort conditions and the application of solar energy in dwellings as essential elements of a process of sustainable development. (Author)

  16. Estimativa da irradiação solar global com partição mensal e sazonal para a região de Cascavel - PR Evaluation of global solar irradiation with sazonal and monthly partition for the area of Cascavel - PR, Brazil

    Melania I. Valiati

    2005-04-01

    Full Text Available No presente trabalho, mostram-se equações de estimativa da irradiação solar global (R G, por meio do modelo de Angstrom, com partições sazonal e mensal para a região de Cascavel - PR. Os dados experimentais foram cedidos pelo IAPAR, coletados na sua estação meteorológica localizada na COODETEC/Cascavel - PR, no período de 1983 a 1998. Dos 16 anos de dados, 12 anos foram utilizados para cálculo dos coeficientes (a e b e quatro anos para a validação das equações. Os coeficientes de determinação encontrados foram superiores a 80% para as duas partições. O mínimo da R G é superestimado e o máximo é subestimado quando comparados com o mínimo e o máximo para dados reais, sendo esses encontrados no solstício de inverno e equinócio de primavera, respectivamente. A variação sazonal e mensal do coeficiente "a" foi menor (0,16 a 0,19 e 0,14 a 0,21 e do coeficiente "b" maior (0,34 a 0,43 e 0,32 a 0,44. As maiores variações dos erros médios diários ocorreram no equinócio de primavera (-19,45% a 27,28% e as menores no equinócio de outono (-11,32% a 10,61%. O ajuste mais eficaz das equações foi encontrado para a partição mensal.This research shows equations of evaluation of global solar irradiation (GR through Angstrom's model with seasonal monthly partitions for the region of Cascavel -PR, Brazil. The experimental data were given by IAPAR and collected in its meteorological station located in COODETEC/Cascavel - PR, Brazil, from 1983 to 1998. Twelve of the sixteen years of data were used for calculation of the coefficients (a and b and four years for the validation of the equations. The determination coefficients found were superior to 80% for both partitions. The minimum (GR is overestimated and the maximum is underestimated when compared to the minimum and maximum for real data, been these found in the winter solstice and spring equinox, respectively. The seasonal and monthly variation of the coefficient "a" was lower

  17. Diseño multiobjetivo de un sistema híbrido eólico-solar con baterías para zonas no interconectadas

    Alejandro Castillo Ramírez

    2014-01-01

    Full Text Available Solar and wind power are the two major natural sources of intermittent power in the world. The combination of these sources has proved to be a suitable combination to maximize system reliability. A chronological methodology based on Hongxing and Diaf techniques for optimal sizing of a Photovoltaic Wind Hybrid System (HPWS (using batteries for energy storage is presented. Accordingly, the purpose of this work is to help to promote the hybrid power system concept through a fully theoretical point of view. The model can be used to optimize the system configuration, minimizing Loss of Power Supply Probability (LPSP and Annualized Cost of the System (ACS. The proposed methodology was used to design an isolated HPWS that meets the energy demand of 49 users at Ishiruwo settlement (located in the municipality of Uribia, State of La Guajira - Colombia. Results show that there is an inversely proportional behavior between the two objectives under evaluation. Likewise, the chosen solution with low cost and high reliability suggests that it is better to use a fully Photovoltaic System (PV, since wind-turbine cost is very high. Finally, it is clear that the cost of isolated systems has begun to gain importance due to its competitiveness when compared to other types of generation such as diesel, although more than 50% of its value lies in batteries and other components.

  18. Uma nova metodologia para dimensionamento de sistemas híbridos de energia (solar-eólica utilizando ferramentas de simulação e otimização - DOI: 10.4025/actascitechnol.v27i1.1506

    Carlos Eduardo Camargo Nogueira

    2005-03-01

    Full Text Available Este trabalho apresenta uma nova metodologia para dimensionamento de sistemas híbridos de energia (solar-eólica com armazenamento em banco de baterias, utilizando ferramentas de simulação e otimização. O modelo desenvolvido é útil para a energização de áreas rurais isoladas e resulta num sistema com custo mínimo e alta confiabilidade, baseado no conceito de perda de fornecimento de energia à carga (LPSP aplicado para horas consecutivas. Alguns cenários são calculados e comparados, utilizando-se diferentes períodos de horas consecutivas e diferentes valores de LPSP. Os resultados apresentam um dimensionamento completo do sistema e uma avaliação de custos ao longo de vários anos

  19. Solar building

    Zhang, Luxin

    2014-01-01

    In my thesis I describe the utilization of solar energy and solar energy with building integration. In introduction it is also mentioned how the solar building works, trying to make more people understand and accept the solar building. The thesis introduces different types of solar heat collectors. I compared the difference two operation modes of solar water heating system and created examples of solar water system selection. I also introduced other solar building applications. It is conv...

  20. Aceptabilidad del diagnóstico rápido casero para HIV entre hombres gay y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires.

    Balán, Iván C; Carballo-Diéguez, Alex; Marone, Rubén O; Pando, María A; Barreda, Victoria; Avila, María M

    2011-03-01

    El uso del diagnóstico rápido para HIV en Argentina, así como otros países de Latinoamérica, ha sido limitado hasta el momento. Este trabajo reporta los resultados provenientes de un estudio cualitativo realizado entre hombres gays y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires, Argentina. El objetivo principal del mismo fue conocer las ventajas y desventajas que los hombres G&HSH perciben en relación al diagnóstico rápido casero para HIV. Se realizaron ocho grupos focales con 73 participantes en los cuales se discutió acerca de las ventajas y desventajas del uso de los diagnósticos rápidos. Las respuestas fueron codificadas utilizando un programa para análisis de datos cualitativos (NVivo) y analizadas temáticamente. Los participantes describieron numerosas ventajas sobre el uso del diagnóstico rápido casero, aunque algunos reportaron importantes preocupaciones dentro de las cuales se destaca la posibilidad de impulsos suicidas si alguien recibe un resultado positivo estando solo. En términos generales se observó una gran aceptabilidad para el uso del diagnóstico rápido si el mismo es realizado por personal de salud en lugares acondicionados para este fin. PMID:25284951

  1. Montaje para una exposición de pintura en el palacio de Villahermosa. Remodelado - Madrid

    Rodríguez de Partearroyo, Francisco

    1986-10-01

    Full Text Available The works for the remodelling of the Villahermosa Palace in order to integrate it as a part of the complex of the Prado Museum are reported. This building v/as before adapted for a bank head office. The remodelling was carried out specially on the building indoors to obtain the same ambient that this of the Museum House by means of the arrangement of the walls, of the linings, etc.Se describen en este artículo los trabajos de remodelación del palacio de Villahermosa, con vistas a su integración como parte del complejo del Museo del Prado. El edificio había sido anteriormente acondicionado como sede de una entidad bancaria. La remodelación ha consistido fundamentalmente en adecuar el interior del edificio para conseguir un ambiente análogo al de las salas del Museo mediante la disposición de muros, revestimientos, etc., capaces de crear dicho ambiente.

  2. Clasificador difuso de señales de vibración para monitoreo de rodamientos/Vibratio Based Fuzzy Classifier for Bearing Monitoring

    Fredy Julián Otero Quijano

    2011-12-01

    Full Text Available En este artículo se presenta un sistema clasificador difuso de señales de vibración para el monitoreo de rodamientos. La base de conocimiento, asociada al clasificador difuso, se obtiene del comportamiento en frecuencia y magnitud de la señal de vibración para fallas en pista exterior e interior, en canastilla o en un elemento rodante. El sistema difuso se implementa en ambiente Matlab® y se valida en un banco acondicionado para el estudio de vibraciones en rodamientos. El sistema mostró ser confiable y robusto en la detección de la falla en cada uno de los distintos rodamientos en prueba.This paper presents a vibration based fuzzy classifier used to detect fault conditions in bearings. The fuzzy knowledge foundation is obtained from the behavior of the vibration signal in presence of a fault condition in outer race, inner race, cage and rolling element. The fuzzy system is implemented in Matlab® and it is validated in a vibration dedicate test bench used for research proposes. The system performance exhibits reliability and robustness in the fault detection in each experimental fault scenario.

  3. Impacto de técnicas innovadoras aplicadas a la cadena agroalimentaria espárrago (Asparagus officinalis L. para optimizar el posicionamiento en diferentes mercados

    Alicia Zubiría

    2010-01-01

    Full Text Available El espárrago (Asparagus officinalis L. es un producto delicado cuyo destino son segmentos de mercados muy exigentes en la presentación y cada vez más proclives a la adquisición de productos IV Gama, presentados en bandeja y listos para consumir. Actualmente, existen técnicas innovadoras de manejo productivo (empleo de plantines y manejo poscosecha (empleo de bandejas. Con el objetivo de estudiar el impacto sobre el rendimiento de densidades (D1: 35.714; D2: 23.810 y D3: 17.857 pl/ha, tamaños de plantines PG:celda grande (70 cm E3, PM:celda mediana (50 cm E3 y PP:celda pequeña (20 cm E3 y la pérdida de peso fresco durante la poscosecha de turiones de distintos calibres (Large L, Medium M y Small S acondicionados en bandejas con (CF y sin film (SF, se realizó un ensayo, en la Facultad de Agronomía, UNCPBA, en donde se evaluaron las variables: productividad neta comercial (PNCH (kg/ha; por cosecha (PNCC (kg/cosecha; Nº de turiones (NT y peso promedio por turión (PPT. PNCH fue 1º año: 8012,6 kg/ha; 2º año: 4468,86 kg/ha (p < 0,05, mientras que PG:5.757, PM:6.213 y PP:6.688 kg/ha. El PPT de PG:10,46; PM:9,86 y PP:10,77 g/turión. D1 produjo 1069,14 kg/ha más y la mayor cantidad de turiones/ha (648,033. El peso fresco de los turiones acondicionados CF resultó estadísticamente superior (p < 0,05, obteniéndose en promedio 13,0 y para SF 10,45 g/turión. Respecto de los calibres los mayores perdieron menos peso (CF-L:5; CF-M:5; CF-S:9,1 %; SF-L:26; SF-M:35; SF-S: 36,36 %. Solo se conservaron características organolépticas en CF; L:50, M:28,57 y S:14,28 %. Por lo expuesto convendría utilizar D1 y el empleo de bandejas para su acondicionamiento.

  4. Impacto de técnicas innovadoras aplicadas a la cadena agroalimentaria espárrago (Asparagus officinalis L. para optimizar el posicionamiento en diferentes mercados

    Andrea P. Guisolis

    2010-12-01

    Full Text Available El espárrago (Asparagus officinalis L. es un producto delicado cuyo destino son segmentos de mercados muy exigentes en la presentación y cada vez más proclives a la adquisición de productos IV Gama, presentados en bandeja y listos para consumir. Actualmente, existen técnicas innovadoras de manejo productivo (empleo de plantines y manejo poscosecha (empleo de bandejas. Con el objetivo de estudiar el impacto sobre el rendimiento de densidades (D1: 35.714; D2: 23.810 y D3: 17.857 pl/ha, tamaños de plantines PG:celda grande (70 cm3, PM:celda mediana (50 cm3 y PP:celda pequeña (20 cm3 y la pérdida de peso fresco durante la poscosecha de turiones de distintos calibres (Large L, Medium M y Small S acondicionados en bandejas con (CF y sin film (SF, se realizó un ensayo, en la Facultad de Agronomía, UNCPBA, en donde se evaluaron las variables: productividad neta comercial (PNCH (kg/ha; por cosecha (PNCC (kg/cosecha; Nº de turiones (NT y peso promedio por turión (PPT. PNCH fue 1º año: 8012,6 kg/ha; 2º año: 4468,86 kg/ha (p < 0,05, mientras que PG:5.757, PM:6.213 y PP:6.688 kg/ha. El PPT de PG:10,46; PM:9,86 y PP:10,77 g/turión. D1 produjo 1069,14 kg/ha más y la mayor cantidad de turiones/ha (648,033. El peso fresco de los turiones acondicionados CF resultó estadísticamente superior (p < 0,05, obteniéndose en promedio 13,0 y para SF 10,45 g/turión. Respecto de los calibres los mayores perdieron menos peso (CF-L:5; CF-M:5; CF-S:9,1 %; SF-L:26; SF-M:35; SF-S: 36,36 %. Solo se conservaron características organolépticas en CF; L:50, M:28,57 y S:14,28 %. Por lo expuesto convendría utilizar D1 y el empleo de bandejas para su acondicionamiento.

  5. Solar Features - Solar Flares

    National Oceanic and Atmospheric Administration, Department of Commerce — A solar flare is a short-lived sudden increase in the intensity of radiation emitted in the neighborhood of sunspots. For many years it was best monitored in the...

  6. Solar storms; Tormentas solares

    Collaboration: Pereira Cuesta, S.; Pereira Pagan, B.

    2016-08-01

    Solar storms begin with an explosion, or solar flare, on the surface of the sun. The X-rays and extreme ultraviolet radiation from the flare reach the Earths orbit minutes later-travelling at light speed. The ionization of upper layers of our atmosphere could cause radio blackouts and satellite navigation errors (GPS). Soon after, a wave of energetic particles, electrons and protons accelerated by the explosion crosses the orbit of the Earth, and can cause real and significant damage. (Author)

  7. The actions to incentive the use of thermal-solar systems in brazilian residences of social interest; As acoes para o incentivo ao uso de sistemas termossolares na habitacao brasileira de interesse social

    Fantinelli, Jane Tassinari [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Planejamento de Sistemas Energeticos]. E-mail: janetassinari@terra.com.br; Pereira, Jose Tomaz Vieira [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Mecanica]. E-mail: tomaz@unicamp.br; Pereira, Elizabeth Marques Duarte [Pontificia Univ. Catolica de Minas Gerais (PUC-MG), Belo Horizonte (Brazil). Coordenadora do Centro Brasileiro de Desenvolvimento da Energia Solar e Termica (GREEN Solar)]. E-mail: elizabeth.pereira@green.pucminas.br

    2006-07-01

    This work presents an inquiry of the actions and promotions developed for the public power, since the first program of considered solar energy in 1987, Pro-Solar, and the successive plans and action that excessively the agents had developed for the stimulation to the substitution of the electric shower of water heating for solar collectors among classes of low-cost houses brazilian. The carried through boarding was historical, so that the period of training could be verified that if finds the public plans for the adoption of mechanisms that come to stimulate the diffusion of the solar technology in the housing of social interest. (author)

  8. Solar Energy.

    Eaton, William W.

    Presented is the utilization of solar radiation as an energy resource principally for the production of electricity. Included are discussions of solar thermal conversion, photovoltic conversion, wind energy, and energy from ocean temperature differences. Future solar energy plans, the role of solar energy in plant and fossil fuel production, and…

  9. Solar Combisystems

    Thür, Alexander

    2006-01-01

    This note first introduces what is a solar combisystem, the structure how a solar combisystem is build up and what are criteria’s to evaluate a solar combisystem concept. Further on the main components of a solar combisystem, the main characteristics and possible advantages and disadvantages...... compared to each other are described. It is not the goal of this note to explain the technical details how to design all components of a solar combisystem. This is done during other lectures of the solar course and in other basic courses as well. This note tries to explain how a solar combisystem...

  10. Solar energy

    Rapp, D.

    1981-01-01

    The book opens with a review of the patterns of energy use and resources in the United States, and an exploration of the potential of solar energy to supply some of this energy in the future. This is followed by background material on solar geometry, solar intensities, flat plate collectors, and economics. Detailed attention is then given to a variety of solar units and systems, including domestic hot water systems, space heating systems, solar-assisted heat pumps, intermediate temperature collectors, space heating/cooling systems, concentrating collectors for high temperatures, storage systems, and solar total energy systems. Finally, rights to solar access are discussed.

  11. A residential solar roofing program for Brazil: guidelines for public policies envisaging the use of photovoltaic generation connected to the power line; Um programa residencial de telhados solares para o Brasil: diretrizes de politicas publicas para a insercao da geracao fotovoltaica conectada a rede eletrica

    Salamoni, Isabel Tourinho

    2009-07-01

    Although Brazil has great potential for photovoltaics (PV), and is particularly privileged by high solar radiation levels, the role of this renewable energy source (RES) at the Brazilian market is still very small, and the current legislation of the electric sector has no incentives for grid-connected PV systems. The high costs and the paradigm that this RES is feasible for grid-connection only for developed countries are the fundamental arguments placed to justify the lack of consideration of PV energy in Brazil. The main aim of this thesis is to develop a guideline to create a reliable legislation and regulation framework for the Brazilian electrical sector towards the implementation of a widespread grid-connected PV roofs program, and to show a grid parity analysis between conventional generation and PV generation. It also demonstrates the benefits of grid-connected PV systems and it presents the bottlenecks that limit the widespread adoption of PV energy at the Brazilian electrical sector mix. The proposed mechanism to be applied in Brazil is based on the German program (Feed-in Law) and it is analyzed under different scenarios. With this study, it is possible to make an economic viability analysis of grid-connected PV in Brazil, to identify the most suitable PV roof program size for the beginning of the program, and the consequent impacts on tariffs, through the dilution of these costs for the residential energy consumer. The grid-parity analysis shows that from 2015 and 2020 it will be possible to reach grid parity for PV in some regions in Brazil. It is possible that this parity happens even before that time, according to the interest rates applied in Brazil. In this context, it is crucial to create an incentive program to promote PV energy in Brazil, even if current prices are not competitive with conventional generation prices, so that the necessary experience to develop a large scale mechanism could happen with the maximum benefits and in an orderly way

  12. Solar thanksgiving; Solarer Erntedank

    Zehner, Mike; Doll, Andreas [Hochschule Muenchen (Germany). Arbeitsgruppe PV-Systeme; Hammer, Annette [Oldenburg Univ. (Germany). Arbeitsgruppe Energiemeteorologie; Heesen, Henrik te [Meteocontrol GmbH, Augsburg (Germany). Forschungsprojekt zur Analyse von Fernueberwachungsmessdaten; Herbort, Volker [Meteocontrol GmbH, Augsburg (Germany). Bereich Data-Mining-Vorhaben; Mariani, Marco [Meteocontrol GmbH, Augsburg (Germany). Abt. PV Ertragsgutachten und Prognosen

    2012-03-09

    While the 'felt' weather in 2011 was quite rainy, it was in fact one of the five hottest years since 1881, with many sunshine hours. This is reflected in photovoltaic power generation in 2011. Many owners of PV systems were surprised to find record solar power generation figures. In many cases, even the best case scenarios were topped.

  13. Solar Features

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of solar feature datasets contributed by a number of national and private solar observatories located worldwide.

  14. Solar Indices

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  15. Solar Imagery

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of solar photographic and illustrated datasets contributed by a number of national and private solar observatories located worldwide....

  16. Solar urticaria

    Srinivas C

    1995-01-01

    Full Text Available A 35-year-old female and a 41-year-old male presented with clinical features suggestive of solar urticaria. The diagnosis of solar urticaria and the effectiveness of a combination of H1 and H2 blocking antihistamines were confirmed by phototesting with a solar simulator

  17. Solar Equipment

    1983-01-01

    A medical refrigeration and a water pump both powered by solar cells that convert sunlight directly into electricity are among the line of solar powered equipment manufactured by IUS (Independent Utility Systems) for use in areas where conventional power is not available. IUS benefited from NASA technology incorporated in the solar panel design and from assistance provided by Kerr Industrial Applications Center.

  18. Resíduos biológicos nos Institutos de Medicina Legal de Goiás: implicações para os trabalhadores

    Izildinha Pedreira Barros

    2006-12-01

    Full Text Available Os objetivos deste estudo foram identificar o manejo dos resíduos biológicos nos Institutos de Medicina legal, segundo as diferentes etapas previstas na legislação nacional vigente; verificar a situação de risco biológico ocupacional para os trabalhadores dos Institutos de Medicina Legal (IML do Estado de Goiás A coleta de dados foi realizada por meio de observação direta, entrevista e questionário com os trabalhadores. Apesar desses serviços gerarem resíduos semelhantes ao de qualquer instituição de saúde, estes não são segregados, acondicionados e dispostos conforme as normas legais vigentes. O manejo de perfurocortantes foi o principal risco para o trabalhador, gerando exposição percutânea. Embora, haja uma consciência, entre os trabalhadores, acerca do risco biológico envolvido em suas atividades, há baixa adesão às medidas de proteção. A maioria não usa os equipamentos de proteção individual recomendados, e não têm esquema completo para as vacinas contra o vírus da hepatite B e contra o tétano. Os resultados mostram a ausência de uma política voltada para o gerenciamento dos resíduos biológicos nos IML, a vulnerabilidade dos profissionais quanto aos riscos com material biológico e a premente necessidade de educação permanente em relação às medidas de biossegurança.

  19. Resíduos biológicos nos institutos de medicina legal de Goiás: implicações para os trabalhadores

    Izildinha Pedreira Barros

    2006-12-01

    Full Text Available Os objetivos deste estudo foram identificar o manejo dos resíduos biológicos nos Institutos de Medicina legal, segundo as diferentes etapas previstas na legislação nacional vigente; verificar a situação de risco biológico ocupacional para os trabalhadores dos Institutos de Medicina Legal (IML do Estado de Goiás A coleta de dados foi realizada por meio de observação direta, entrevista e questionário com os trabalhadores. Apesar desses serviços gerarem resíduos semelhantes ao de qualquer instituição de saúde, estes não são segregados, acondicionados e dispostos conforme as normas legais vigentes. O manejo de perfurocortantes foi o principal risco para o trabalhador, gerando exposição percutânea. Embora, haja uma consciência, entre os trabalhadores, acerca do risco biológico envolvido em suas atividades, há baixa adesão às medidas de proteção. A maioria não usa os equipamentos de proteção individual recomendados, e não têm esquema completo para as vacinas contra o vírus da hepatite B e contra o tétano. Os resultados mostram a ausência de uma política voltada para o gerenciamento dos resíduos biológicos nos IML, a vulnerabilidade dos profissionais quanto aos riscos com material biológico e a premente necessidade de educação permanente em relação às medidas de biossegurança.

  20. Solar Indices - Solar Radio Flux

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  1. Solar Energy: Solar System Economics.

    Knapp, Henry H., III

    This module on solar system economics is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy technologies.…

  2. Diseño de un modelo informático para la estimación de la energía generada en el vehículo solar Aníbal

    Ramírez Basalo, Miguel Ángel

    2012-01-01

    A partir del modelo ya existente de Matlab, compuesto por una fuente de tensión continua, un bloque de simulación del regulador y un motor de corriente continua sin escobillas (brushless DC motor), se quiere desarrollar cualquier tipo de simulación que pueda ayudar en el diseño y simulación del coche solar haciendo ver las partes donde se puede mejorar o cualquier aplicación que pueda ayudar en la configuración del coche dependiendo de las condiciones solares. Después de pensar...

  3. Sistema de pronóstico de radiación solar a corto plazo a partir de un modelo meteorológico y técnicas de post-proceso para España

    Rincón Rodríguez, Angel Alberto

    2013-01-01

    El incremento de la utilizaci on de la energ a solar como fuente de generaci on de energ a requiere de una adecuada estimaci on de la radiaci on solar global y directa incidente en la super cie terrestre. La estimaci on de la radiaci on global se realiza mediante simulaciones de modelos num ericos de pron ostico meteorol ogico que contienen la informaci on sobre la variabilidad de las condiciones temporales, geogr a cas y atmosf ericas. Dicha estimaci on representa la base del pron ostico d...

  4. Preparation of thin films, with base to precursor materials of type Cu-In-Se elaborated by electrodeposition for the solar cells elaboration; Preparacion de peliculas delgadas, con base a materiales precursores del tipo Cu-In-Se, elaboradas por electrodeposito para la elaboracion de celdas solares

    Fernandez, A.M. [Centro de Investigaciones en Energia, Universidad Nacional Autonoma de Mexico. Av. Xochicalco s/n. 62580 Temixco, Morelos (Mexico)

    1999-11-01

    Thin films of chalcogenide compounds are promising because they have excellent optoelectronic characteristics to be applied in solar cells. In particular, CuInSe{sub 2} and Cd Te thin films have shown high solar to electrical conversion efficiency. However, this efficiency is limited by the method of preparation, in this case, physical vapor deposition techniques are used. In order to increase the area of deposition t is necessary to use chemical methods, for example, electrodeposition technique. In this paper, the preparation of Cu-In-Se precursors thin films by electrochemical method is reported. These precursors were used to build solar cells with 7.9 % of efficiency. (Author)

  5. Primeiro registro de Tomoplagia reimoseri Hendel e Xanthaciura mallochi Aczél (Diptera: Tephritidae para o Estado de Santa Catarina, Brasil First records of Tomoplagia reimoseri Hendel e Xanthaciura mallochi Aczél (Diptera: Tephritidae for Santa Catarina state, Brazil

    Sandra Mara Sabedot

    2008-09-01

    Full Text Available O presente trabalho tem como objetivo levantar as espécies de tefritídeos endófagos associados a capítulos de asteráceas em Chapecó, Santa Catarina. Para tanto, foram efetuadas coletas quinzenais no município de Chapecó, Santa Catarina, durante o período de setembro de 2005 a setembro de 2006, concentradas na primavera e no verão. Os capítulos foram destacados diretamente das plantas, no campo, e acondicionados em sacos plásticos. Este trabalho constitui o primeiro registro de Tomoplagia reimoseri Hendel e Xanthaciura mallochi Aczél coletados em capítulos de Asteraceae no município de Chapecó, elevando para 72 espécies de tefritídeos registradas para o referido Estado.The present research aimed to inventory the species of endophagous tephritids associated to Asteraceae capitula in Chapecó, Santa Catarina. Samples of capitula were collected every two weeks in Chapecó, from september 2005 to september 2006, concentrating efforts on spring and summer. The capitula were collected directly from the plants and conditioned in plastic bags. This research constitutes the first register of Tomoplagia reimoseri Hendel and Xanthaciura mallochi Aczél specimens collected from Asteraceae capitula in Chapecó, elevating to 72 the number of tephritid species registered to the State of Santa Catarina.

  6. Solar Photovoltaic

    Wang, Chen; Lu, Yuefeng

    2016-01-01

    In the 21st century, human demand for new energy sources is urgent, because the traditional fossil energy is unable to meet human needs, and the fossil resource will make pollution, in this situation, solar energy gradually into the vision of scientists. As science advances, humans can already extensive use of solar energy to generate electricity. Solar energy is an inexhaustible and clean energy. In the global energy crisis, environmental pollution is the growing problem of today. The us...

  7. Solar Simulator

    1981-01-01

    Oriel Corporation's simulators have a high pressure xenon lamp whose reflected light is processed by an optical system to produce a uniform solar beam. Because of many different types of applications, the simulators must be adjustable to replicate many different areas of the solar radiation spectrum. Simulators are laboratory tools for such purposes as testing and calibrating solar cells, or other solar energy systems, testing dyes, paints and pigments, pharmaceuticals and cosmetic preparations, plant and animal studies, food and agriculture studies and oceanographic research.

  8. Construção de um aquecedor solar de água sustentável na Amazônia: usando a metodologia PBL para interação entre cursos de engenharia e escola de ensino médio

    Patricia Mota Milhomem

    2015-12-01

    Full Text Available Em todo o país está sendo amplamente difundida a utilização de fontes de energia renováveis, um dos exemplos claros disso é a energia solar, o que exige conhecimentos das mais variadas áreas da ciência para o aperfeiçoamento dessa nova área de pesquisa. Dessa forma, com o intuito de incentivar aos alunos do ensino médio em se empenhar no estudo das ciências e no desenvolvimento de pesquisas, o Programa de Extensão Laboratório de Engenhocas, da Universidade Federal do Pará Campus de Tucuruí, aprovou projetos no CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico e aplicou em escolas estaduais de ensino médio do município a metodologia PBL (Project Based Learning, visando ensinar o aluno a aprender, ser proativo e despertar o interesse na área das ciências aplicadas. Dentro das atividades desenvolvidas o aluno busca resolver problemas da sociedade através da metodologia. Uma delas foi à construção e implantação de um Aquecedor Solar de Baixo Custo em uma residência unifamiliar de Tucuruí onde foi possível analisar sua viabilidade e eficiência energética.

  9. Síntese de esteres poliméricos a partir do poli(álcool vinílico) para aplicação como filtros solares

    Sakae, George Hideki

    2013-01-01

    Resumo: O presente trabalho apresenta o desenvolvimento de esteres polimericos com propriedades de absorcao na regiao do UV, obtidos atraves da reacao do poli(alcool vinilico) (PVAl) parcialmente hidrolisado (87-89%) e os anidridos dos acidos cinamico, anisico e p-metoxicinamico, buscando sua utilizacao na composicao de formulacoes fotoprotetoras. Para a modificacao quimica do polimero foram testadas algumas metodologias, assim denominadas neste trabalho: "One-pot", Aduto de Vilsmeier e Anidr...

  10. Life Cycle Assessment (LCA) of the test thermal with parabolic through collectors for direct steam generation; Analisis de ciclo de vida de una planta de captadores solares clindro-parabolicos para generaacion directa de vapor

    Jimenez, T. N.; Garcia, R. L.; Gomez, C. C.; Zarza, M. E.

    2004-07-01

    This paper present the results of Life Cycle Assessment (LCA) of the test thermal with parabolic through collectors for direct steam generation, DISS (DIrect Solar Steam), installed in the Plataforma Solar de Almeria (PSA) of CIEMAT (Centro de Investigaciones Energeticas, Mediambientales y Tecnologicas). The LCA is an environmental management methodology with which the environmental impacts associate to a system, process product are detected. The ISO standard 14040: 1997 contain the procedure to follow. life cycle of the plant is divided in 4 stages: extraction and transformation of raw materials; transport and installation; completion of the system to operate like a steam generator maintenance, and dismantling. As result, some improvements are recommended, mainly related to changes in the types of materials and the treatment of the emissions. (Author)

  11. Criterios para el diseño, dimensionado y control de instalaciones de refrigeración solar mediante máquinas de absorción de mediana potencia

    Bujedo Nieto, Luis Angel

    2014-01-01

    A pesar de que la refrigeración solar lleva varias décadas dentro del campo de la investigación aplicada de la energía solar, y a pesar de la gran cantidad de documentación científica existente, no acaba de producirse el salto que le permita su implantación masiva. Por otro lado, hay un elevado número de instalaciones de demostración que no acaban de arrojar buenos resultados de explotación o de los que se dispone de poca información. Ello es debido, entre otras causas, a la falta de criterio...

  12. Solarização do solo para o controle de Pythium e plantas daninhas em cultura de crisântemo Soil solarization for Pithium and weed control in chrysanthemum crop

    W. Bettiol

    1994-12-01

    Full Text Available A solarização, durante dois meses, de um solo naturalmente infestado com Pythium, promoveu o controle do patógeno, de modo semelhante à aplicação de metalaxyl + mancozeb, na cultura de crisântemo. A incidência média de plantas mortas foi de 2,3% nas parcelas solarizadas; 1,0% no solo solarizado que recebeu metade da dose dos fungicidas; 9,0% com a aplicação da dose completa dos fungicidas (1 g de metalaxyl + 4,8 g de mancozeb/m² e 38,9%, na testemunha não tratada. A solarização também promoveu o controle de plantas daninhas, avaliado através do peso da matéria seca das plantas emergentes aos 21 dias após o transplante das mudas, semelhantemente ao herbicida oxidiazon.Two months solarization of a soil naturally infested with Pythium sp. promoted a level of control similar to what was obtained with the application of methalaxyl + mancozeb for the chrysanthemum crop. The average rate of dead plants was 9.0% with the application of fungicides (1 g of methalaxyl + 4.8 g of mancozeb/ m²; 2.3% in solarized plots; 1.0% in solarized plots which received half the dosages of the fungicides and 38.9% in control plots. Similar control of weeds was obtained in solarized plots and plots treated with the herbicide oxidiazon.

  13. METODOLOGÍA PRÁCTICA PARA EVALUAR LA VIABILIDAD DE REDES DE FRIO Y CALOR URBANAS INTEGRANDO ENERGÍA SOLAR Y BIOMASA EN LA ESPAÑA CÁLIDA

    Galvany Castillo, Francisco Jose

    2016-01-01

    [EN] For more than a decade, the urban heat networks (District Heating, DH) combined with the use of renewable energies have been consolidated as a leading tool for energy efficiency and reducing emissions of greenhouse gases. Among the various possibilities of generation in the North and Central Europe, with little or no annual demand for comfort cooling, since the 80s a large number of facilities, that use solar energy with large seasonal accumulators capable to store surplus heat captu...

  14. El liberalsocialismo para Bobbio y para nosotros

    Bovero, Michelangelo

    2006-01-01

    Partiendo de las ideas sobre el liberalsocialismo en el pensamiento de Norberto BOBBIO y hallando en el ámbito del constitucionalismo el terreno propicio, no ya para un compromiso, sino para una forma de reconciliación entre la tradición liberal y la socialista, el autor propone una caracterización del liberalsocialismo articulada en dos niveles: en un “liberalsocialismo mínimo” (o liberalsocialismo para la democracia), entendido como un “mínimo indispensable para la democracia”, y en un “lib...

  15. Instalación de energía solar térmica en viviendas

    Olmedo Torre, Noelia; Farrerons Vidal, Óscar; Prieto Urbano, Andrés

    2015-01-01

    Este documento muestra el aprovechamiento de la energía solar para producir el Agua Caliente Sanitaria (ACS) necesaria para climatizar una vivienda ubicada en Girona. Este documento muestra el aprovechamiento de la energía solar para producir el Agua Caliente Sanitaria (ACS) necesaria para climatizar una vivienda ubicada en Girona. Conocidas las necesidades energéticas de la vivienda, se procede a dimensionar la instalación de captadores solares con el fin de abastecer dicha demanda energé...

  16. Solar thermal

    While wind power is widely acknowledged as the most developed of the 'new' renewables, the number two technology, in terms of installed capacity functioning worldwide, is solar heating, or solar thermal. The author has investigated recent industry reports on how these markets are developing. The authors of an International Energy Agency (IEA) survey studied 41 countries in depth at the end of 2004, revealing that 141 million m3 - corresponding to an installed capacity of 98.4 GWth - were installed in the sample countries (these nations represent 3.74 billion people, about 57% of the world's population). The installed capacity within the areas studied represents approximately 85%-90% of the solar thermal market worldwide. The use of solar heating varies greatly between countries - even close neighbours - and between economic regions. Its uptake often has more to do with policy than solar resource. There is also different uptake of technology. In China, Europe and Japan, plants with flat-plate and evacuated tube collectors are used, mainly to heat water and for space heating. Unglazed plastic collectors, used mainly for swimming pool heating, meanwhile, dominate the North American markets. Though the majority of solar heating installations today are installed on domestic rooftops, the larger-scale installations should not be overlooked. One important part of the market is the hotel sector - in particular hotels in locations that serve the seasonal summer holiday market, where solar is extremely effective. Likewise hospitals and residential homes, multi-family apartment blocks and sports centres are all good examples of places where solar thermal can deliver results. There are also a growing number of industrial applications, where solar thermal can meet the hot water needs (and possibly more) of a range of industries, such as food processing and agriculture. The ability of solar to provide a heat source for cooling is expected to become increasingly important as fuel

  17. Analysis of Methodologies for Identifying Exclusion Zones for Concentrating Solar Power (CSP); Analisis de Metodologias de Identificacion de Zonas de Exclusion para Estudios de Potencial de Energia Electrica Termosolar (CSP)

    Dominguez, P.; Ramirez, L.; Navarro, A. A.; Polo, J.; Zarza, E.

    2013-07-01

    The aim of this study is the proposal of a valid and unique methodology to any territory of the potential for solar power generation, reducing subjectivity and enabling comparison of results from the examination of several existing methodologies for CSP, particularly those developed by the Institute for diversification and saving of Energy (IDAE), Greenpeace, National renewable energy laboratory (NREL) and the German Aerospace Center (DLR). Subsequently, we apply and compare the results obtained with those already installed CSP plants, giving an idea of the suitability of each methodology to locate plants in areas considered suitable. (Author)

  18. Modelamiento del proceso de adsorcion y desorcion de metanol en un lecho de carbón activado para la aplicación en sistemas de refrigeración solar por adsorción intermitente

    Cortés Correa, Farid Bernardo

    2006-01-01

    Resumen: Los sistemas de refrigeración por adsorción permiten aprovechar fuentes térmicas no convencionales como la energía solar y desechos de calor residual generados por el proceso industrial. En estos sistemas, no se utilizan equipos altamente consumidores de energía eléctrica como los compresores; sino que son remplazados por otros “generadores”, que cumplen la misma función pero realizan procesos diferentes: desorción (generación de gases) y Adsorción. El generador es el equipo clav...

  19. Estrategia didáctica de trabajo colaborativo apoyada en herramientas tic para la comprensión de las relaciones de tamaño y posición de los planetas del Sistema Solar.

    Perdomo Guzmán, Carlos Andrés

    2013-01-01

    El estudio de las relaciones de tamaño y distancia respecto al sol de los planetas del sistema solar en la educación básica y media se ha visto enfrentado a una serie de errores conceptuales. Esta propuesta brinda a los docentes un espacio de trabajo virtual interactivo y de trabajo colaborativo enmarcado dentro de las tecnologías de la información y la comunicación (TIC), específicamente con el uso de PREZI, donde, a partir de una revisión y una fundamentación epistemológica y disciplinar ...

  20. Modelo híbrido de refrigeración solar por absorción

    José Manuel Garibay-Cisneros; Sergio Llamas-Zamorano; José A. Martínez-Grave de Peralta; Luis Eduardo Alcaraz-Iñiguez

    2011-01-01

    Se muestra un modelo híbrido de refrigeración solar por absorción. Trata de un sistema que utiliza energía solar como gas metano, este último se emplea únicamente cuando no se tenga suficiente energía solar para operar el equipo de refrigeración, para el que se utiliza amoniaco como sustancia refrigerante.

  1. Solar Radio

    National Oceanic and Atmospheric Administration, Department of Commerce — Scientists monitor the structure of the solar corona, the outer most regions of the Sun's atmosphere, using radio waves (100?s of MHz to 10?s of GHz). Variations in...

  2. Solar prominences

    Engvold, Oddbjørn

    2015-01-01

    This volume presents the latest research results on solar prominences, including new developments on e.g. chirality, fine structure, magnetism, diagnostic tools and relevant solar plasma physics. In 1875 solar prominences, as seen out of the solar limb, were described by P.A. Secchi in his book Le Soleil as "gigantic pink or peach-flower coloured flames". The development of spectroscopy, coronagraphy and polarimetry brought tremendous observational advances in the twentieth century. The authors present and discuss exciting new challenges (resulting from observations made by space and ground-based telescopes in the 1990s and the first decade of the 21st century) concerning the diagnostics of prominences, their formation, their life time and their eruption along with their impact in the heliosphere (including the Earth). The book starts with a general introduction of the prominence “object” with some historical background on observations and instrumentation. In the next chapter, the various forms of promine...

  3. Solar Lentigo

    ... your body. Treatments Your Physician May Prescribe If solar lentigines are cosmetically bothersome, your physician may: Freeze the area lightly with liquid nitrogen. Prescribe a bleaching cream (hydroquinone), but this is often not successful. Trusted ...

  4. Solar chulha

    Jadhao, P. H.; Patrikar, S. R.

    2016-05-01

    The main goal of the proposed system is to transfer energy from sun to the cooking load that is located in the kitchen. The energy is first collected by the solar collector lens system and two curve bars of same radius of curvature are mounted parallel and adjacent to each other at different height the solar collector is clamed on this two bars such that solar collector is exactly perpendicular to sunlight. The topology includes an additional feature which is window in the wall through which the beam is collimated is directed in the of kitchen. The solar energy that is collected is directed by the mirror system into the kitchen, where it is redirected to cooking platform located in the kitchen. The special feature in this system full Indian meal can be made since cooking platform is indoors.

  5. Development of a controller based on Fuzzy theory to better use the energy of a hybrid system power generation solar-photovoltaic and wind; Desenvolvimento de um controlador baseado na teoria Fuzzy para melhor aproveitamento da energia de um sistema hibrido de geracao de energia solar-fotovoltaico e eolico

    Caneppele, Fernando de Lima [Universidade Estadual Paulista (UNESP), Itapeva, SP (Brazil). Campus Experimental], E-mail: fernando@itapeva.unesp.br; Seraphim, Odivaldo Jose [Universidade Estadual Paulista (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Dept. de Engenharia Rural; Gabriel Filho, Luis Roberto de Almeida [Universidade Estadual Paulista (UNESP), Tupa, SP (Brazil). Campus Experimental

    2010-07-01

    The work developed a methodology fuzzy and simulated its use in control of a hybrid system of electric power generation, using solar-photovoltaic and wind energy. Using this control system, we get the point of maximum energy generation and transfer all the energy generated from alternative sources, solar-photovoltaic and wind energy to charge and / or batteries. The model uses three input variables, which are: wind (wind speed), sun (solar radiation) and batteries (charge the battery bank). With these variables, the fuzzy system will play, according to the rules to be described, what is the source of power supply system, which will have priority and how the batteries are loaded. For the simulations regarding the use of fuzzy theory to control, we used the scientific computing environment MATLAB. In this environment have been analyzed and simulated all mathematical modeling, rules and other variables described in the fuzzy system. This model can be applied to implement a control system of hybrid power generation, providing the best use of renewable energy, solar and wind, so that we can extract the maximum possible energy of these alternative sources without compromising the environment. (author)

  6. Life cycle assessment of solar hot water systems in buildings

    Fernandes, Verónica Marisa Martins

    2014-01-01

    Dissertação de mestrado integrado em Engenharia Civil A presente dissertação aborda fundamentalmente conceitos de cariz ambiental e económico aplicados ao ciclo de vida de sistemas solares térmicos para águas quentes sanitárias. Com este trabalho pretende-se alertar os projetistas para a problemática atual das alterações climáticas, de forma a privilegiar o uso de energias renováveis, mais concretamente de energia solar. Para tal serão apresentados e discutidos conceitos e ...

  7. Algunos aspectos de la climatología solar del Uruguay Some aspects of the solar climatology of Uruguay

    Hugo Grossi Gallegos; Carlos Raichijk; Raúl Righini

    2010-01-01

    La cobertura espacial de las redes de medición en tierra no puede satisfacer todas las necesidades de los usuarios debido a su baja densidad esto es más notable en el caso de la radiación solar. La escasez de datos de irradiación global es la razón para utilizar la heliofanía para su estimación mediante el empleo de diferentes correlaciones que han probado tener un buen ajuste con las mediciones. Para trazar cartas de heliofanía (y a partir de ellas, de irradiación solar global) en un territo...

  8. Solar Features - Solar Flares - SIDS

    National Oceanic and Atmospheric Administration, Department of Commerce — A Sudden Ionospheric Disturbance (SID) is any of several radio propagation anomalies due to ionospheric changes resulting from solar or geophysical events.

  9. Solar Features - Solar Flares - Patrol

    National Oceanic and Atmospheric Administration, Department of Commerce — The H-alpha Flare Patrol identifies time periods each day when the sun is being continuously monitored by select ground-based solar observatories.

  10. Project of air conditioning system by absorption of water-lithium bromide using solar energy and simulation of its operation under several conditions; Projeto de sistema para condicionamento de ar por absorcao de agua-brometo de litio utilizando energia solar e simulacao de sua operacao sob condicoes diversas

    Sbravati, Alan; Figueiredo, Jose Ricardo [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Mecanica. Dept. de Energia]. E-mails: alan@fem.unicamp.br; jrfigue@fem.unicamp.br

    2000-07-01

    This article presents computational models for water - lithium bromide absorption air conditioning systems, verifying the use of solar energy as source of heat for the cycle. Four different models were elaborated for the cycle, changing the configurations and hypotheses. In each model two algorithms were elaborated: the first one accomplished the calculations of the heat and mass flows and a estimative of the areas heat transfer, a project of a system, and another which, based on the answers of the first, simulate the behavior of this system when the conditions of initial project are changed, keeping constant the constructive parameters. As in the project a numeric procedure has been used for solution of non lineal systems based on the algorithm of Newton-Raphson. The main alteration among the models went to substitution of the expansion device and evaporator, and, in the fourth model, was increased a procedure for calculation of the solar collector performance. (author)

  11. Regional Analysis of Aids and Prices for Small-scale Grid-connected Solar Photovoltaic Systems in Spain; Analisis Regional de Precios y Ayudas para Sistemas fotovoltaicos de Pequena Escala Conectados a Red Electrica en Espana

    Varela, M.; Ramirez, L.; Mora, L.; Sidrach de Cardona, M.

    2002-07-01

    Electricity production from small solar photovoltaic systems in Spain obtains a premium pnce of 0,36 Euros/kWh over the electricity market price or a fix price of 0.40 Euros/kWh. The development of these small systems, in Spain clearly demonstrates that the established prime is not sufficient in the majority of locations. On the other hand, the prime revision set up by the RD 2818/98. considering the profitability of the renewable installations, demand a regional analysis of small PV systems profitability necessary in Spain. The accomplished results permit to conclude that the amount of the current prime is by itself insufficient to make profitable the small grid-connected PV systems in anywhere of the national geography. To guarantee the profitability of these systems is should be necessary to place the fix price at around 0,93 Euros/k Wh. However, if the duplication of the current price obtained by these installations was considered, this could ensure the profitability of these small systems in at least the 77% of the land. (Author) 12 refs.

  12. Solar Neutrinos

    Davis, R. Jr.; Harmer, D. S.

    1964-12-01

    The prospect of studying the solar energy generation process directly by observing the solar neutrino radiation has been discussed for many years. The main difficulty with this approach is that the sun emits predominantly low energy neutrinos, and detectors for observing low fluxes of low energy neutrinos have not been developed. However, experimental techniques have been developed for observing neutrinos, and one can foresee that in the near future these techniques will be improved sufficiently in sensitivity to observe solar neutrinos. At the present several experiments are being designed and hopefully will be operating in the next year or so. We will discuss an experiment based upon a neutrino capture reaction that is the inverse of the electron-capture radioactive decay of argon-37. The method depends upon exposing a large volume of a chlorine compound, removing the radioactive argon-37 and observing the characteristic decay in a small low-level counter.

  13. Solar chimney

    Solar Chimney is an interesting unconventional method for production of electricity from the sun. It consists of a large greenhouse which purpose is to heat the air and create air flow directing it to the base of the chimney and then through the pressure-staged turbine array. Solar Chimney can be used for pick load operation. Australia plans 200 MW solar plant for the and of 2004, which will be the tallest man made structure in the world with a height of almost 1 km and greenhouse diameter reaching 7.5 km. It is a result of Australia's commitment to find alternative energy solutions in order to reduce the environmental impact of fossil and nuclear technologies for electric power production. (Author)

  14. Solar oscillations

    Amongst all stars observed to pulsate, the Sun has by far the largest number and variety of modes of oscillation. This presents a unique opportunity to apply and test stellar oscillation theory. To match the observational accuracy, very precise calculations of oscillation frequencies are needed. Asymptotic methods have proved useful in the analysis and interpretation of the frequencies. The results provide tight constraints on solar models; they may also enable a direct determination of properties of the solar interior. There are difficulties in reconciling the amplitudes obtained in Doppler velocity with those observed in the apparent position of the solar limb. The excitation of the oscillations is so far not well understood, although it is probable that the interaction between pulsation and convection plays an important role. (orig.)

  15. Creating solar media nets solar tools, publicity

    Brewer, B.

    1980-01-01

    The utilization of locally produced solar tool to gain more access to commercial media is discussed. Central is a strategy of (1) giving commercial media something to report, (2) helping educate the media, and (3) simultaneously impacting that portion of the public which is likely to be most interested. Methods for reaching several target audiences include a Solar Calendar, a Passive Solar Film, a local Solar Directory, a local Solar Information Center, an Emergency Coolth brochure and a Conservation/Solar Retrofit Guide.

  16. Solar neutrinos

    The problem with solar neutrinos is that there seem to be too few of them, at least near the top end of the spectrum, since the 37Cl detector finds only about 35% of the standard predicted flux. Various kinds of explanation have been offered: (a) the standard solar model is wrong, (b) neutrinos decay, (c) neutrinos have magnetic moments, (d) neutrinos oscillate. The paper surveys developments in each of these areas, especially the possible enhancement of neutrino oscillations by matter effects and adiabatic level crossing. The prospects for further independent experiments are also discussed. (author)

  17. Solar cells

    Cuquel, A.; Roussel, M.

    The physical and electronic characteristics of solar cells are discussed in terms of space applications. The principles underlying the photovoltaic effect are reviewed, including an analytic model for predicting the performance of individual cells and arrays of cells. Attention is given to the effects of electromagnetic and ionizing radiation, micrometeors, thermal and mechanical stresses, pollution and degassing encountered in space. The responses of different types of solar cells to the various performance-degrading agents are examined, with emphasis on techniques for quality assurance in the manufacture and mounting of Si cells.

  18. Solar cells

    A method of producing solar cells is described which consists of producing a substantially monocrystalline tubular body of silicon or other suitable semiconductor material, treating this body to form an annular rectifying junction and then cutting it longitudinally to form a number of nearly flat ribbons from which the solar cells are fabricated. The P=N rectifying junction produced by the formation of silicon dioxide on the layers at the inner and outer surfaces of the body can be formed by ion-implantation or diffusion. (U.K.)

  19. Solar lighting

    Pode, Ramchandra

    2011-01-01

    Limited availability of grid-based electricity is a major challenge faced by many developing countries, particularly the rural population. Fuel-based lighting, such as the kerosene lantern, is widespread in these areas, but it is a poor alternative, contributing to global warming and causing serious health problems. Several developing countries are therefore now encouraging the use of sustainable lighting. ""Solar Lighting"" gives an in-depth analysis of energy-efficient light production through the use of solar-powered LED systems. The authors pay particular attention to the interplay between

  20. Colectores solares planos frente a paneles solares termodinámicos

    Pérez Mayorga, Juan Carlos

    2012-01-01

    El objetivo fundamental de este proyecto es el estudio de un tipo de tecnología solar poco extendida, como son las instalaciones de agua caliente sanitaria con paneles solares termodinámicos y su comparación en términos de consumo energético con las instalaciones de agua caliente sanitaria con colectores solares planos, mucho más conocidas. Para ello, estudiaremos la instalación de agua caliente sanitaria de una vivienda unifamiliar en Madrid, con los dos tipos de paneles, cump...

  1. Photon Management Structures for Absorption Enhancement in Intermediate Band Solar Cells and Crystalline Silicon Solar Cells

    Mellor Null, Alexander Virgil

    2013-01-01

    El objetivo de la tesis es investigar los beneficios que el atrapamiento de la luz mediante fenómenos difractivos puede suponer para las células solares de silicio cristalino y las de banda intermedia. Ambos tipos de células adolecen de una insuficiente absorción de fotones en alguna región del espectro solar. Las células solares de banda intermedia son teóricamente capaces de alcanzar eficiencias mucho mayores que los dispositivos convencionales (con una sola banda energética prohibida), per...

  2. Solar maximum: solar array degradation

    The 5-year in-orbit power degradation of the silicon solar array aboard the Solar Maximum Satellite was evaluated. This was the first spacecraft to use Teflon R FEP as a coverglass adhesive, thus avoiding the necessity of an ultraviolet filter. The peak power tracking mode of the power regulator unit was employed to ensure consistent maximum power comparisons. Telemetry was normalized to account for the effects of illumination intensity, charged particle irradiation dosage, and solar array temperature. Reference conditions of 1.0 solar constant at air mass zero and 301 K (28 C) were used as a basis for normalization. Beginning-of-life array power was 2230 watts. Currently, the array output is 1830 watts. This corresponds to a 16 percent loss in array performance over 5 years. Comparison of Solar Maximum Telemetry and predicted power levels indicate that array output is 2 percent less than predictions based on an annual 1.0 MeV equivalent election fluence of 2.34 x ten to the 13th power square centimeters space environment

  3. Solar Energy and You.

    Conservation and Renewable Energy Inquiry and Referral Service (DOE), Silver Spring, MD.

    This booklet provides an introduction to solar energy by discussing: (1) how a home is heated; (2) how solar energy can help in the heating process; (3) the characteristics of passive solar houses; (4) the characteristics of active solar houses; (5) how solar heat is stored; and (6) other uses of solar energy. Also provided are 10 questions to…

  4. Solar satellites

    Poher, C.

    1982-01-01

    A reference system design, projected costs, and the functional concepts of a satellite solar power system (SSPS) for converting sunlight falling on solar panels of a satellite in GEO to a multi-GW beam which could be received by a rectenna on earth are outlined. Electricity transmission by microwaves has been demonstrated, and a reference design system for supplying 5 GW dc to earth was devised. The system will use either monocrystalline Si or concentrator GaAs solar cells for energy collection in GEO. Development is still needed to improve the lifespan of the cells. Currently, the cell performance degrades 50 percent in efficiency after 7-8 yr in space. Each SSPS satellite would weigh either 34,000 tons (Si) or 51,000 tons (GaAs), thereby requiring the fabrication of a heavy lift launch vehicle or a single-stage-to-orbit transport in order to minimize launch costs. Costs for the solar panels have been estimated at $500/kW using the GaAs technology, with transport costs for materials to GEO being $40/kg.

  5. Solar Power

    Ford, Norman C.; Kane, Joseph W.

    1971-01-01

    Proposes a method of collecting solar energy by using available plastics for Fresnel lenses to focus heat onto a converter where thermal dissociation of water would produce hydrogen. The hydrogen would be used as an efficient non-polluting fuel. Cost estimates are included. (AL)

  6. Solar Neutrinos

    Bellini, G.; Ranucci, G.

    2010-01-01

    Solar neutrino investigation has represented one of the most active field of particle physics over the past decade, accumulating important and sometimes unexpected achievements. After reviewing some of the most recent impressive successes, the future perspectives of this exciting area of neutrino research will be discussed.

  7. Solar system

    Homer, Charlene

    2007-01-01

    Thrill young astronomers with a journey through our Solar System. Find out all about the Inner and Outer Planets, the Moon, Stars, Constellations, Asteroids, Meteors and Comets. Using simplified language and vocabulary, concepts such as planetary orbits, the asteroid belt, the lunar cycle and phases of the moon, and shooting stars are all explored.

  8. Sistema Solar

    Federación de Asociaciones de Astronomía Cielo de Comellas

    2004-01-01

    Lección sobre el Sistema Solar. Curso de Astronomía Básica, segunda edición, impartido por los miembros de la Federación de Asociaciones de Astronomía Cielo de Comellas. Casa de la Ciencia, sábados, del 24 de septiembre al 22 de octubre de 2011

  9. Producción de primicia en invernadero de híbridos masculinos de espárrago (Asparagus officinalis y procesado IV Gama para optimización del posicionamiento en el mercado

    Sofía Barreto

    2012-12-01

    Full Text Available El espárrago es una hortaliza muy valorada por sus propiedades, que ha experimentado un notable incremento durante los últimos años a nivel global, contando con una creciente demanda por parte de mercados muy exigentes respecto a su presentación y cada vez mas enfocados a adquirir productos listos para consumir. Con el objetivo de estudiar la productividad total (PBT y neta (PFN (kg/ha de espárrago verde bajo cubierta, el periodo de poscosecha (PPC y la pérdida de peso fresco diaria (PPFD promedio de turiones acondicionados en bandejas con film (B y atados sin film (A, se realizó un ensayo para comparar la producción de primicia en invernadero, de cuatro híbridos masculinos de espárrago verde, en la Facultad de Ciencias Agrarias de la UCA, en Buenos Aires, Argentina. La mayor producción neta (PFN se obtuvo con el híbrido Italo: 8.925,00 kg/ha, seguido por Zeno: 5.558,68; UC-157: 5.267,02; Eros: 4.937,75 y Ercole: 3.099,02 kg/ha (p < 0,05. En general se observó una mayor precocidad en los híbridos de origen italiano respecto del UC-157, único de origen americano. El peso fresco de los turiones de espárrago verde, acondicionados en bandejas, se conservarían por más tiempo sin alterar su peso inicial significativamente respecto del uso de atados. Con el empleo de bandejas, el PPC resultó 22 días mayor (A: 13 y B: 35. La PPFD promedio para ambas presentaciones, fue inferior en Italo y Zeno (1,35 y 1,50 % diaria, respecto de Ercole y Eros (1,99 y 2,04 %, respectivamente. La conservación del peso fresco (CPP para los distintos híbridos, mediante A, a lo largo de los 13 días de poscosecha fue: Italo: 76,91 %; Zeno: 69,34 %; Ercole: 64,71 %; Eros: 61,51 %. En el caso de B, a lo largo de los 35 días fue de: Zeno: 77,63 %; Italo: 67,95 %; Eros: 61,15 %; Ercole: 55,38 %. Estos resultados demuestran la mayor productividad de primicia mediante el empleo de Italo, Zeno, UC-157, Eros y Ercole, y; en poscosecha, la conveniencia del

  10. Producción de primicia en invernadero de híbridos masculinos de espárrago (Asparagus officinalis y procesado IV Gama para optimización del posicionamiento en el mercado

    Sofía Barreto

    2012-01-01

    Full Text Available El espárrago es una hortaliza muy valorada por sus propiedades, que ha experimentado un notable incremento durante los últimos años a nivel global, contando con una creciente demanda por parte de mercados muy exigentes respecto a su presentación y cada vez mas enfocados a adquirir productos listos para consumir. Con el objetivo de estudiar la productividad total (PBT y neta (PFN (kg/ha de espárrago verde bajo cubierta, el periodo de poscosecha (PPC y la pérdida de peso fresco diaria (PPFD promedio de turiones acondicionados en bandejas con film (B y atados sin film (A, se realizó un ensayo para comparar la producción de primicia en invernadero, de cuatro híbridos masculinos de espárrago verde, en la Facultad de Ciencias Agrarias de la UCA, en Buenos Aires, Argentina. La mayor producción neta (PFN se obtuvo con el híbrido Italo: 8.925,00 kg/ha, seguido por Zeno: 5.558,68; UC-157: 5.267,02; Eros: 4.937,75 y Ercole: 3.099,02 kg/ha (p < 0,05. En general se observó una mayor precocidad en los híbridos de origen italiano respecto del UC-157, único de origen americano. El peso fresco de los turiones de espárrago verde, acondicionados en bandejas, se conservarían por más tiempo sin alterar su peso inicial significativamente respecto del uso de atados. Con el empleo de bandejas, el PPC resultó 22 días mayor (A: 13 y B: 35. La PPFD promedio para ambas presentaciones, fue inferior en Italo y Zeno (1,35 y 1,50 % diaria, respecto de Ercole y Eros (1,99 y 2,04 %, respectivamente. La conservación del peso fresco (CPP para los distintos híbridos, mediante A, a lo largo de los 13 días de poscosecha fue: Italo: 76,91 %; Zeno: 69,34 %; Ercole: 64,71 %; Eros: 61,51 %. En el caso de B, a lo largo de los 35 días fue de: Zeno: 77,63 %; Italo: 67,95 %; Eros: 61,15 %; Ercole: 55,38 %. Estos resultados demuestran la mayor productividad de primicia mediante el empleo de Italo, Zeno, UC-157, Eros y Ercole, y; en poscosecha, la conveniencia del

  11. Diseño y ensayos en tierra de paneles solares y baterías para un satélite de órbita baja = Design and testing procedures of a Low Earth Orbit (LEO) satellite power subsystem (solar panels and battery)

    Manuel Navío, Carlos de

    2013-01-01

    Las principal conclusión que se puede obtener tras el estudio es que el satélite, tal y como se ha tenido en cuenta, es perfectamente funcional desde el punto de vista eléctrico. Por la parte de la generación de potencia, los paneles son capaces de ofreces una cantidad tal como para que aproximadamente la mitad (en el caso de funcionamiento normal) de esta potencia sea destinada a la carga útil. Además, incluso en los modos de fallo definidos, el valor de potencia dedicada a la carga útil, es...

  12. Generador solar de 600 W amb lents de Fresnel

    Alfonso Prieto-Puga, Adrián de

    2011-01-01

    El objetivo de este proyecto es diseñar el prototipo de seguidor de dos ejes adecuado para mover un generador solar que aprovechará la concentración solar obtenida por refracción a través de Lentes de Fresnel. Este generador debe ser capaz de calentar agua y producir electricidad a la vez. El generador basa su funcionamiento en un módulo solar fotovoltaico especial fabricado por la empresa Trigen Solar S.L. que unifica tecnología fotovoltaica y térmica. Actualmente, las plac...

  13. Desarrollo y aplicación del diagnóstico y pronóstico técnico al mantenimiento de los sistemas centralizados de aire acondicionado. // Develop and application of diagnosis and technical prediction to maintenance of centralized air conditioned systems.

    J. L. Sánchez Ávila

    2001-10-01

    Full Text Available Se expone la aplicación del mantenimiento por diagnóstico y pronóstico técnico al sistema centralizado de aireacondicionado con recuperación del calor del hotel LTI Bella Costa; como solución a los graves problemas a que seenfrenta la dirección de servicios técnicos de las instalaciones turísticas para realizar un mantenimiento con calidad y a unmenor costo. El desarrollo de un plan experimental, en las instalaciones del hotel, permitió obtener las curvas que expresanel comportamiento de la degradación de estos sistemas en el tiempo, así como determinar el momento más oportuno para larealización del mantenimiento.La aplicación de esta investigación permitió la implementación de un mantenimiento menoscostoso y de más calidad, aumentando la rentabilidad de la labor del mantenimiento, y lo que es decisivo en este tipo deinstalación: la seguridad en la explotación como garantía de un servicio sin fallas.Palabras claves: Mantenimiento, refrigeración, predictivo, diagnóstico, pronóstico.___________________________________________________________________Abstract:The application of maintenance by diagnosis and technical prediction to centralized system of conditioned air withrecovery of heat is exposed; as solution to the serious problems faces technical services of tourist facilities to carry outmaintenance with quality and smaller cost. The development of an experimental plan, in hotel facilities, allowed to obtaincurves that express the behavior of degradation of these systems in time, as well as to determine the most opportunemoment for the maintenance realization. Application of this investigation allowed the implementation of a less expensivemaintenance with more quality, increasing the profitability of maintenance work, and what is decisive in this type ofinstallation,: the security in the exploitation like guarantee of a service without flaws.Key words. Maintenance, refrigeration, prediction, diagnosis, air conditioned.

  14. Desarrollo y aplicación del diagnóstico y pronóstico técnico al mantenimiento de los sistemas centralizados de aire acondicionado // Develop and application of the diagnosis and technical prediction to the maintenance of the centralized systems of conditi

    J. L. Sánchez Ávila

    2000-10-01

    Full Text Available Se expone la aplicación del mantenimiento por diagnóstico y pronóstico técnico al sistema centralizado de aireacondicionado con recuperación del calor del hotel LTI Bella Costa; como solución a los graves problemas a que seenfrenta la dirección de servicios técnicos de las instalaciones turísticas para realizar un mantenimiento con calidad y a unmenor costo.El desarrollo de un plan experimental, en las instalaciones del hotel, permitió obtener las curvas que expresan elcomportamiento de la degradación de estos sistemas en el tiempo, así como determinar el momento más oportuno para larealización del mantenimiento.La aplicación de esta investigación permitió la implementación de un mantenimiento menos costoso y de más calidad,aumentando la rentabilidad de la labor del mantenimiento, y lo que es decisivo en este tipo de instalación: la seguridad en laexplotación como garantía de un servicio sin fallas.Palabras claves: mantenimiento, refrigeración, predictivo, diagnóstico, pronóstico.____________________________________________________________________Abstract:In this paper is exposed the application of the maintenance by diagnosis and technical prediction to the centralized systemof air conditioned with heat recovery of the hotel Beautiful LTI Costa; as a solution to the serious problems that thetechnical management services faces in the tourist facilities to carry out a maintenance with quality and whith smaller cost.The development of an experimental plan, in the hotel facilities, allowed to obtain the curves that express the behavior ofthe degradation of these systems in the time, as well as to determine the most opportune moment for the realization of themaintenance.The application of this investigation allowed the implementation of a less expensive maintenance and of more quality,increasing the profitability of the maintenance work, and what is decisive in this installation type: the security in theexploitation as a

  15. Preliminary analysis for implementation of a hybrid solar-wind system with storage of electrical energy generated through electrolytic hydrogen and fuel cells; Analise preliminar para implementacao de um sistema hibrido solar-eolico com armazenamento da energia eletrica gerada atraves de hidrogenio eletrolitico e celula a combustivel

    Lopes, Daniel Gabriel; Furlan, Andre Luis; Lopes, Davi Gabriel [Universidade Estadual de Campinas (FEM/UNICAMP), SP (Brazil). Fac. de Engenharia Mecanica], e-mail: danielg@fem.unicamp.br; Silva, Ennio Peres; Apolinario, Fernando Resende [Universidade Estadual de Campinas (IFGW/UNICAMP), SP (Brazil). Inst. de Fisica Gleb Wataghin. Lab. de Hidrogenio; Silva, Maria Eugenia Vieira da; Rocha, Paulo Alexandre Costa [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Engenharia Mecanica e de Producao; Codeceira Neto, Alcides [Companhia Hidro Eletrica do Sao Francisco (CHESF), Recife, PE (Brazil)

    2008-07-01

    Due to relevance of the study and applicability of hybrid electric power generation from solar photovoltaic and wind power in Brazil, the present paper aims to introduce briefly the importance of technical and economic comparison of two electrical energy storage technologies (batteries versus H2 + fuel cell) and also to indicate the previous difficulties related to this possible application. In this context, it was intended a partnership between State University of Campinas - UNICAMP, the Federal University of Ceara - UFC and Hydro Electric Company of the Sao Francisco - CHESF in the meaning of makes viable an implementation. (author)

  16. Normas para vivienda

    Coupé, Françoise

    1990-01-01

    El Seminario Taller Normas para Vivienda, analiza los efectos de las normas vigentes en el país, sobre el desarrollo urbano, la vivienda y la calidad de vida, para participar en la discusión del Estatuto Metropolitano de Usos del Suelo, Urbanismo y Construcción. Se presenta en este Boletín algunos resultados del trabajo realizado.

  17. Oficinas y laboratorios para Portland Iberia, S. A., Castillejos (Toledo

    López Zuriaga, Julio

    1963-11-01

    dependencias se han desarrollado en un edificio en forma de U, con comunicaciones perfectas, y comprendiendo planta baja y semisótano. Se han organizado tres zonas en planta baja: «zona de oficinas», en una rama de la U, dando a la parte del complejo industrial más en contacto con los obreros; «zona de representación», en el centro, ocupada por la sala de Juntas, Dirección y Subdirección, y «zona de trabajo», en donde se distribuyen los laboratorios y dependencias complementarias. Como la primera y última tenían que estar completas con servicios anejos a ellas, éstos se pusieron en la planta de semisótano y se dejó el semisótano de la zona de representación para la instalación de aire acondicionado. La unión de dichas zonas se realiza mediante pasadizos, más bajos que el resto de los edificios y que sirven de juntas de dilatación. Bajo el punto de vista estético, y dadas las características de ser un centro de oficinas en una fábrica de cemento, se consideró que el elemento peculiar del edificio fuera el hormigón visto, por lo que se le ha dado un valor bien definido a dicho material. La ordenación de espacios, perfección y acabado de instalaciones, proporciona al conjunto un aspecto de distinguida sencillez.

  18. Helioseismology, solar models and solar neutrinos

    Fiorentini, G; B. Ricci

    1999-01-01

    We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we shall address the following points: i) helioseismic tests of recent SSMs; ii)the accuracy of the helioseismic determination of the sound speed near the solar center; iii)predictions of neutrino fluxes based on helioseismology, (almost) independent of SSMs; iv)helioseismic tests of exotic solar models.

  19. Collecting Solar Energy. Solar Energy Education Project.

    O'Brien, Alexander

    This solar energy learning module for use with junior high school students offers a list of activities, a pre-post test, job titles, basic solar energy vocabulary, and diagrams of solar energy collectors and installations. The purpose is to familiarize students with applications of solar energy and titles of jobs where this knowledge could be…

  20. Solar club

    Solar club

    2013-01-01

    SOLAR CLUB Le  CERN-Solar-Club souhaite une  très bonne année 2013 à tous les Cernois et Cernoises, et remercie encore une fois  tous ceux et celles qui, fin octobre, par leur vote, nous ont permis de finir dans les 5 premiers du concours "Conforama Solidaire" et ainsi financer nôtre projet "énergie solaire et eau potable pour Kilela Balanda" en République Démocratique du Congo (voir : http://www.confo.ch/solidarite/?lang=fr). Nous vous annoncons également notre Assemblée Générale Annuelle jeudi 21 février à 18 h 00 Salle C, 1er étage, Bât. 61 Vous êtes les bienvenus si vous souhaitez en savoir un peu plus sur les énergies renouvelables.

  1. Fisica solare

    Degl’Innocenti, Egidio Landi

    2008-01-01

    Il volume è un'introduzione alla Fisica Solare che si propone lo scopo di illustrare alla persona che intende avvicinarsi a questa disciplina (studenti, dottori di ricerca, ricercatori) i meccanismi fisici che stanno alla base della complessa fenomenologia osservata sulla stella a noi più vicina. Il volume non ha la pretesa di essere esauriente (basta pensare che la fisica solare spazia su un gran numero di discipline, quali la Fisica Nucleare, la Termodinamica, L'Elettrodinamica, la Fisica Atomica e Molecolare, la Spettoscopia in tutte le bande dello spettro elettromagnetico, la Magnetoidrodinamica, la Fisica del Plasma, lo sviluppo di nuova strumentazione, l'Ottica, ecc.). Piuttosto, sono stati scelti un numero di argomenti di rilevanza fondamentale nello studio presente del Sole (soprattutto nei riguardi delle osservazioni da terra con grandi telescopi) e su tali argomenti si è cercato di dare una panoramica generale, inclusiva dell'evoluzione storica, senza scendere in soverchi dettagli. Siccome la Fis...

  2. Solar cells

    Treble, F. C.

    1980-11-01

    The history, state of the art, and future prospects of solar cells are reviewed. Solar cells are already competitive in a wide range of low-power applications, and during the 1980's they are expected to become cheaper to run than diesel or gasoline generators, the present mainstay of isolated communities. At this stage they will become attractive for water pumping, irrigation, and rural electrification, particularly in developing countries. With further cost reduction, they may be used to augment grid supplies in domestic, commercial, institutional, and industrial premises. Cost reduction to the stage where photovoltaics becomes economic for large-scale power generation in central stations depends on a technological breakthrough in the development of thin-film cells. DOE aims to reach this goal by 1990, so that by the end of the century about 20% of the estimated annual additions to their electrical generating capacity will be photovoltaic.

  3. Solar flares

    In this thesis an electrodynamic model for solar flares is developed. The main theoretical achievements underlying the present study are treated briefly and the observable flare parameters are described within the framework of the flare model of this thesis. The flare model predicts large induced electric fields. Therefore, acceleration processes of charged particles by direct electric fields are treated. The spectrum of the accelerated particles in strong electric fields is calculated, 3 with the electric field and the magnetic field perpendicular and in the vicinity of an X-type magnetic neutral line. An electromagnetic field configuration arises in the case of a solar flare. A rising current filament in a quiescent background bipolar magnetic field causes naturally an X-type magnetic field configuration below the filament with a strong induced electric field perpendicular to the ambient magnetic field. This field configuration drives particles and magnetic energy towards the neutral line, where a current sheet is generated. The global evolution of the fields in the flare is determined by force balance of the Lorentz forces on the filament and the force balance on the current sheet. The X-ray, optical and radio observations of a large solar flare on May 16, 1981 are analyzed. It is found that these data fit the model very well. (Auth.)

  4. Modeling for sustainable use of biofuels, eolic and solar energy within the scope of the local Brazilian Integrated Planning of Energy Resources: case study of this plan in Aracatuba region, SP, Brazil; Modelagem para o aproveitamento sustentavel dos biocombustiveis, energia eolica e solar dentro do PIR (Planejamento Integrado de Recursos Energeticos) local: estudo de caso do PIR da regiao de Aracatuba, SP, Brasil

    Bernal, Jonathas Luiz de Oliveira

    2009-07-01

    It is evaluated the wind power, solar energy resources and biofuels available in Aracatuba through integrated resources planning methodology. which seeks to systematize and qualify the impacts associated with the use of energy by integrating supply and demand and seeking the lowest full-cost recital characteristics of each energy resource in environmental, social, political and technical-economic dimensions . Working with the demand forecast for trend, sustainable energy scenarios, optimistic and sustainable-prime as a PIN for the integration of energy resources over time, and considering the vigilant of Energy-environmental parameters, fetching mapping meeting local demand and export of energy. Thus conclude that the energy resources considered may meet the requirements of demand in all scenarios, but with the possibility of exhaustion in certain scenarios with planning horizon larger than 30 years. (author)

  5. Early solar physics

    Meadows, A J

    1970-01-01

    Early Solar Physics reviews developments in solar physics, particularly the advent of solar spectroscopy and the discovery of relationships between the various layers of the solar atmosphere and between the different forms of solar activity. Topics covered include solar observations during 1843; chemical analysis of the solar atmosphere; the spectrum of a solar prominence; and the solar eclipse of December 12, 1871. Spectroscopic observations of the sun are also presented. This book is comprised of 30 chapters and begins with an overview of ideas about the sun in the mid-nineteenth century, fo

  6. Solar solution

    China is facing enormous energy challenges. Everyone seems to know that we need to increase our energy supply by the equivalent of one power plant per week to support China's economic growth, which is allowing millions of people to enjoy better standards of living. Much less is known of the extent to which China has taken steps to mitigate the impact of that growing energy demand through incentives for greater efficiency and renewable energy. Policies include: Cutting energy intensity - 20 per cent between 2005 and 2010, saving five times as much CO2 as the EU's goals. Cutting major pollutants by 10 per cent by 2010. Setting one of the world's most aggressive renewable energy standards: 15 per cent of national energy from renewables by 2020. Setting targets of 300 megawatts of installed solar by 2010, and 1.8 gigawatts by 2020, in the 2007 National Development and Reform Commission Renewable Energy Development Plan. Dedicating $180 billion for renewable energy by 2020. Imposing energy efficiency targets for the top 1,000 companies, a measure with greater carbon savings potential than most Western initiatives. Establishing building energy codes in all regions and extensive efficiency standards for appliances, which will be particularly important as China continues to grow. Targeting new buildings in major cities like Beijing, Shanghai and Chongqing, to achieve 65 per cent greater energy efficiency than local codes require. Closing thousands of older, smaller, dirtier power plants by 2010. China understands the economic development potential in clean energy technologies. Even the noted journalist Thomas Friedman has remarked that 'China is going green in a big way,' using domestic demand for cleaner energy to build low-cost, scalable green technologies. Suntech Power Holdings - now the world's largest solar photovoltaic (PV) module manufacturer, with operations around the globe - was just one of dozens of solar companies that realised the opportunity provided by

  7. Plastic solar collector: feature and applications; Colector solar de plastico: Caracteristicas y aplicaciones

    Bistoni, Silvia; Iriarte, Adolfo [Universidad Nacional de Catamarca, Catamarca (Argentina); Saravia, Luis [Universidad Nacional de Salta, Salta (Argentina)

    2000-07-01

    The Argentinean northwest (NOA) is an exceptional zone to use solar energy, because of its climate and its solar radiation levels. The aim of this paper is to analyze the use of low temperature solar heating system by mean of a plastic collector. The system proposed includes: a) Solar collectors built with plastic bags, welded in such a way that water, introduced at the top, falls by gravity through a zigzag long path. Each collector is fed by drip feed irrigations. b) Hot water storage and c) Water pump, hydraulic circuit and electronic controls. Two ways of use are proposed: as a water solar heating and as a system to heat greenhouses. In this second case, if during the day the air temperature inside the greenhouse is higher than the water storage temperature, the water will be heated in the bags. During the night the bags work as heat exchanger. When the temperature inside the greenhouse needs to be maintained at a constant value, the heating system is combined with a gas water heating. The equipment is described, performances are compared for both uses and the global heat exchange coefficient is calculated. The system's behavior inside a greenhouse is analyzed in two different situations. The utilization of plastic solar collectors has demonstrate to be a valid alternative for low temperature solar energy uses, specially in heating agricultural spaces. [Spanish] La region del Noreste Argentino (NOA), por su clima y muy en particular por los niveles de radiacion solar que posee, es una zona excepcional para el aprovechamiento de la energia solar. El objetivo de este trabajo es analizar el uso de la energia solar a baja temperatura mediante un colector de plastico. El sistema propuesto incluye: a) Colector solar construido con una bolsa de plastico soldada en forma tal, que el agua que se introduce por la parte superior cae por la gravedad siguiendo un camino en zigzag. Cada colector se alimenta mediante goteros de riego autocompensados. b) Almacenamiento

  8. Control solar e iluminación natural en la Arquitectura Dispositivos de control solar fijos en clima semicálido-subhúmedo

    Zambrano Prado, Perla Liliana

    2013-01-01

    En regiones cercanas a los trópicos, la protección solar de la envolvente y el aprovechamiento de la iluminación natural, son criterios potenciales para el diseño pasivo en la arquitectura, sin embargo lograr un sistema de control solar óptimo que no comprometa los niveles de iluminación natural del local, pero que responda a los requerimientos de ganancias solares y protección solar se convierte en un reto. En está investigación se analizan distintos sistemas de control solar fijos ext...

  9. Leer para Sophia

    Cassany, Daniel

    2009-01-01

    Leer para Sophia re??ne algunos de mis trabajos m??s recientes sobre la lectura, desde perspectivas complementarias, te??ricas y pr??cticas, destacando el tema de futuro de la lectura electr??nica o en l??nea. El t??tulo de este volumen tiene un doble sentido : primero apela al significado griego del vocablo sophia (sabidur??a), para iluminar uno de los prop??sitos esenciales de la lectura: aprender y comprender; luego quiere agradecer ...

  10. Prospective of the solar thermal technologies through concentration for the generation of electrical energy (Annexe 4 in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Prospectiva de las tecnologias termosolares a concentracion para la generacion de potencia electrica (Anexo 4 en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Ramos Berumen, Carlos [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-08-15

    In this document are presented the technical-economical the present state of the technologies with electricity generation purposes at worldwide level and the technological prospective for the next years. At present it is estimated that in most of the power scenarios at worldwide level the situation will continue with a strong dependency in fossil fuels. The future dynamics of the energy procurement will depend on diverse factors such as energy efficiency, the international norms and regulations derived of the environmental impact and prices of the primary energy sources. The countries of the first world are developing new technologies of compatible character with the environment, with self-consumption intentions and with the vision of establishing new markets of export towards developing countries. In this context, several countries have established R y D programs for the generation of electricity through solar systems using the thermodynamic conversion. [Spanish] En este documento se presenta el estado actual tecnico-economico de las tecnologias con propositos de generacion de electricidad a nivel mundial y la prospectiva tecnologica para los proximos anos. En la actualidad se estima que en la mayoria de los escenarios energeticos a nivel mundial la situacion continuara con una fuerte dependencia de los combustibles fosiles. La dinamica futura del suministro de energia dependera de diversos factores como la eficiencia energetica, las normas y regulaciones derivadas del impacto ambiental y los precios internacionales de los energeticos. Los paises del primer mundo estan desarrollando nuevas tecnologias de caracter compatible con el medio ambiente, con propositos de autoconsumo y con la vision de establecer nuevos mercados de exportacion hacia paises en desarrollo. En este contexto, varios paises han establecido programas de Investigacion y Desarrollo para la generacion de electricidad a traves de sistemas solares utilizando la conversion termodinamica.

  11. Solar tracking mechanism in two axes; Mecanismo de seguimiento solar en dos ejes

    Ramirez Benitez, Juan Rafael; Ramos Berumen, Carlos; Beltran Adan, Jose; Lagunas Mendoza, Javier [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: jlagunas@iie.org.mx; rramirez@iie.org.mx; cramos@iie.org.mx

    2010-11-15

    The Instituto de Investigaciones Electricas (IIE) has been interested in the Parabolic Dish technology for electricity generation in Mexico, then through its Non Conventional Energy Department has dedicated special tasks concerning to the knowledge and development of such technology. The structural component, reflective surface support and the tracking system which allows concentrate the solar energy into the receiver have been designed and manufactured. For the mechanical device and control of the solar tracking have been projected a set with servomotors, an electronic control as well as an interface for the equipment configuration and follow-up. In order for getting the following of the apparent movement of the sun, information on the sun paths through the year was analyzed and in consequence elevation and azimuth angles were determined. Using that approaches, for fixing the sun position sensors are not used and then only the control algorithm and the electronic device developed at the IIE were implemented. In this paper the sun tracking system and the electronic control device are presented. [Spanish] La tecnologia de plato parabolico para la generacion de electricidad en Mexico, ha sido de gran interes para el Instituto de Investigaciones Electricas, por lo que a traves de la Gerencia de Energias No Convencionales se ha avocado a la tarea de conocer y desarrollar esta tecnologia. Se ha disenado y fabricado la parte estructural, la base de la superficie reflejante y el sistema de seguimiento que permite concentrar la energia solar en el receptor. Para el mecanismo y control del seguidor solar se ha propuesto un mecanismo que utiliza servomotores, un control electronico asi como una interfaz para configurar el equipo y monitorear sus variables. Para lograr el seguimiento del movimiento aparente del sol se analizo la informacion en literatura de las trayectorias del sol a lo largo del ano, logrando asi determinar los angulos de altitud y azimut para acotar el

  12. Solar Neutrino Problem

    Davis, R. Jr.; Evans, J. C.; Cleveland, B. T.

    1978-04-28

    A summary of the results of the Brookhaven solar neutrino experiment is given and discussed in relation to solar model calculations. A review is given of the merits of various new solar neutrino detectors that were proposed.

  13. BLM Solar Energy Zones

    Bureau of Land Management, Department of the Interior — Priority development areas for utility-scale solar energy facilities as identified in the Solar PEIS Record of Decision. An additional Solar Energy Zone identified...

  14. Solar Electricity

    1988-01-01

    ARCO Solar manufactures PV Systems tailored to a broad variety of applications. PV arrays are routinely used at remote communications installations to operate large microwave repeaters, TV and radio repeaters rural telephone, and small telemetry systems that monitor environmental conditions. Also used to power agricultural water pumping systems, to provide electricity for isolated villages and medical clinics, for corrosion protection for pipelines and bridges, to power railroad signals, air/sea navigational aids, and for many types of military systems. ARCO is now moving into large scale generation for utilities.

  15. Solar Bicycle

    S. Sridhar; HARSHENDRA. N. SHET. K

    2011-01-01

    The running costs of the present vehicles are rising day by day hence common man is looking for an alternate mode of transport, with low fuel and maintenance cost. Solar bicycle is an attempt to meet these needs. It is an environmentally sustainable and zero running cost vehicle. It uses photovoltaic cells to absorb energy from sunlight. The absorbed energy is stored in battery. The hub motor mounted on the rear wheel uses this energy to run the cycle. A fully charged battery gives a mileage ...

  16. Analysis of economic viability in a hybrid solar-wind system in the generation of electrical energy to an Maroon isolated community of Jalapao - TO, Brazil; Analise da viabilidade economica em um sistema hibrido solar-eolico na geracao de energia eletrica para uma comunidade isolada e quilombola do Jalapao - TO

    Santos, Weder Ferreira dos; Zukowski Junior, Joel Carlos; Nobrega, Silvestre Lopes da; Marcon, Rogerio Olavo [Universidade Luterana do Brasil (CEULP/ULBRA), Palmas, TO (Brazil). Centro Universitario Luterano

    2008-07-01

    With the increasing of energetic demand in several production sectors, the search for renewable energy sources which do not cause negative environmental impacts has become more and more relevant. Amongst all the important factors to decide for installing isolated generation systems as renewable sources or diesel and taking the distribution network to isolated communities, it should be considered the economic viability of those benefits. This study aimed to analyse the hybrid solar-aeolian system installed in an isolated community, in Jalapao/TO. Three scenarios were analyzed: first of them, getting the capital back with MRI = 6% per year; second one, getting the capital back with MRI = 0; and third, without getting the investment back. In all the three cases, O and M costs were considered. The proceeds were calculated from the production at the community workshop, in which the electricity was available. The results indicated that this technology is economically viable if the generated energy is used for production process. It also demonstrated that the third scenario is more interesting for the community, since the contribution per family is only 8% of its incomes. (author)

  17. Solar '94: Technical papers

    The Solar 94 Conference of the American Solar Energy Society met in San Jose, California to provide a forum for state-of-the-art work in all the solar technologies. The following topics were included in the proceedings: Photovoltaic Modules and Systems; Wind Energy; Solar Thermal Systems; Utility Programs; Solar Water Heating; Solar Fuels; Resource Assessment; Economics and Education. A total of 83 papers were indexed separately for the data base

  18. Solar radiation models - review

    M. Jamil Ahmad, G.N. Tiwari

    2010-01-01

    In the design and study of solar energy, information on solar radiation and its components at a given location is very essential. Solar radiation data are required by solar engineers, architects, agriculturists and hydrologists for many applications such as solar heating, cooking, drying and interior illumination of buildings. For this purpose, in the past, several empirical correlations have been developed in order to estimate the solar radiation around the world. The main objective of this ...

  19. Silicon heterojunction solar cells obtained by Hot-Wire CVD

    Muñoz Cervantes, Delfina

    2008-01-01

    El elevado coste de producción de los módulos de silicio cristalino (c-Si) dificulta el progreso de la industria fotovoltaica como una alternativa viable para la producción de energía limpia. Por esta razón, los fabricantes de células solares buscan diferentes alternativas para conseguir la deseada reducción de costes. Una opción es reducir el grosor de las obleas (

  20. Solar Energy Systems

    1984-01-01

    Calibrated in kilowatt hours per square meter, the solar counter produced by Dodge Products, Inc. provides a numerical count of the solar energy that has accumulated on a surface. Solar energy sensing, measuring and recording devices in corporate solar cell technology developed by Lewis Research Center. Customers for their various devices include architects, engineers and others engaged in construction and operation of solar energy facilities; manufacturers of solar systems or solar related products, such as glare reducing windows; and solar energy planners in federal and state government agencies.

  1. Solar Heating and Cooling

    Duffie, John A.; Beckman, William A.

    1976-01-01

    Describes recent research that has made solar energy economically competitive with other energy sources. Includes solar energy building architecture, storage systems, and economic production data. (MLH)

  2. Solar Club

    Solar Club

    2010-01-01

    Le CERN Solar-Club vous invite à la présentation de sa participation dans : The Cyprus Institute Solar Car Challenge du 18 au 20 juin à Chypre . en réponse à l’invitation dudit institut, dans le cadre de la demande de Chypre pour joindre le CERN . Le Club y participera avec son vénérable Photon rénové , et la Dyane E-Solaire d’un de ses membres, rénové aussi . Après la présentation, le forum est ouvert pour toutes vos questions et propositions diverses, également dans d’autres domaines des énergies renouvelables . C’est aussi l’occasion pour joindre le Club ! Où, et Quand ? Le Mercredi 7 Avril à 19 h 00, au 6ème étage du Bât. Principal, (60-6-015) à la suite de l’AG des membres du Club , à 18h00 dans...

  3. A High Rated Solar Water Distillation Unit for Solar Homes

    Abhishek Saxena; Navneet Deval

    2016-01-01

    India is presently focusing on complete utilization of solar energy and saving fossil fuels, which are limited. Various solar energy systems like solar cookers, solar water heaters, solar lanterns, solar PV lights, and solar lamps are continuously availing by the people of India at a low cost and on good subsidies. Apart from this, India is a solar energy promising country with a good number of solar homes (carrying solar energy systems) in its various locations. The present paper focuses on ...

  4. Solar neutrinos: beyond standard solar models

    Castellani, V.; Degl'Innocenti, S.; Fiorentini, G.; Lissia, M.; Ricci, B.

    1996-01-01

    After a short survey of the physics of solar neutrinos, giving an overview of hydrogen burning reactions, predictions of standard solar models and results of solar neutrino experiments, we discuss the solar-model-independent indications in favour of non-standard neutrino properties. The experimental results look to be in contradiction with each other, even disregarding some experiment: unless electron neutrinos disappear in their trip from the sun to the earth, the fluxes of intermediate ener...

  5. The normalization in the use of solar heaters; La normalizacion en el uso de calentadores solares

    Pilatowsky F, I.; Terrones B, A.; Garcia H, C.R. [Departamento de Sistemas Energeticos, Centro de Investigacion en Energia, UNAM, Mexico, D. F. (Mexico)

    1997-12-31

    This paper presents the different criteria in the establishment of the standard for the converter devices and solar systems for water heating for domestic, commercial and services use, as well as the criteria needed for the standard required for the installation of the equipment and systems. Together with the former, it discusses the establishment of the criteria for the creation of: training programs, of a regulatory commission for the implementation, follow up and penalties derived of the application of the norm, a legal frame, to regulate the legal relationship among the manufacturers and service providers with the consumers, as well as a permanent program for the diffusion of the characteristics, energy saving and the environmental impact derived of the utilization of solar energy. Additionally, a description is made of the first experimental results obtained in a test bench, where the norm ASHRAE 93-77 was applied. [Espanol] En el presente articulo se presentan los diferentes criterios tanto para el establecimiento de la normatividad de los dispositivos conversores y sistemas solares para el calentamiento de agua para uso domestico, comercial y de servicios, asi como los necesarios para la normatividad requerida en la instalacion de los equipos y sistemas. Aunado a lo anterior se analiza el establecimiento de criterios para la creacion de: programas de capacitacion de una comision reguladora de la implantacion, seguimiento y sanciones derivadas de la aplicacion de la norma, un marco legal, regulador de la relacion juridica entre los fabricantes y prestadores de servicios y los consumidores, asi como un programa permanente de difusion sobre las caracteristicas, ahorro de energia e impacto ambiental derivado del uso de la energia solar. Adicionalmente se describen los primeros resultados experimentales obtenidos en un banco de pruebas, en donde se aplico la normas ASHRAE 93-77.

  6. Solar models and solar neutrino oscillations

    Bahcall, John N.; Peña Garay, Carlos

    2004-01-01

    We provide a summary of the current knowledge, theoretical and experimental, of solar neutrino fluxes and of the masses and mixing angles that characterize solar neutrino oscillations. We also summarize the principal reasons for doing new solar neutrino experiments and what we think may be learned from the future measurements.

  7. Solar Energy: Solar System Design Fundamentals.

    Knapp, Henry H., III

    This module on solar system design fundamentals is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy…

  8. Solar Energy: Solar and the Weather.

    Knapp, Henry H., III

    This module on solar and the weather is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy technologies.…

  9. Solar energy an introduction

    Mackay, Michael E

    2015-01-01

    Solar Energy presents an introduction to all aspects of solar energy, from photovoltaic devices to active and passive solar thermal energy conversion, giving both a detailed and broad perspective of the field. It is aimed at the beginner involved in solar energy or a related field, or for someone wanting to gain a broader perspective of solar energy technologies. A chapter considering solar radiation, basic principles applied to solar energy, semiconductor physics, and light absorption brings the reader on equal footing with the technology of either solar generated electrical current or useful heat. Details of how a solar cell works and then production of current from a photovoltaic device is discussed. Characterization of a solar cell is examined, allowing one the ability to interpret the current-voltage relation, followed by discussion of parameter extraction from this relation. This information can be used to understand what limits the performance of a given solar cell with the potential to optimize its pe...

  10. Clay-brick firing in a high-temperature solar furnace

    Villeda-Munoz, G. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: gvilledam@ipn.mx; Castaneda-Miranda, A. [Computation & amp; Mechatronic Studies Division, Universidad Politecnica de Queretaro, Queretaro (Mexico)]. E-mail: acastaneda@upq.edu.mx; Pless, R.C. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: rpless@ipn.mx; Vega-Duran, J.T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico); Pineda-Pinon, J. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: jpinedap@ipn.mx

    2011-10-15

    The firing process for clay-brick production in traditional kilns generates atmospheric pollution when industrial and domestic scrap is used as fuel. An alternative is presented here, using the solar energy for clay-brick firing. We are developing a system for clay-brick firing to reach temperatures between 900 degrees Celsius and 1050 degrees Celsius; these temperatures are sufficiently high to fire bricks or similar ceramic products. The present paper describes the design and characterization of the components of a solar furnace for clay-brick firing with inner chamber dimensions of 0.48 * 0.61 * 0.64 m. To convey the sunlight to the firing chamber, a heliostat with nine 1 * 1 m mirrors is used to send the rays of the sun to an off-axis parabolic concentrator that focuses the light on the entrance of the firing chamber. The heliostat has a solar-tracking system which makes primary and secondary adjustments to assure that the reflected solar radiation always arrives at the concentrator. The firing chamber contains a prismatic cavity that absorbs the solar radiation to generate the heat which is needed for baking the bricks inside the firing chamber. [Spanish] El proceso de coccion para la produccion de tabiques de arcilla en hornos tradicionales genera contaminacion atmosferica cuando los desechos industriales y domesticos se usan como combustibles. Aqui se presenta una alternativa, utilizando la energia solar para la coccion de tabiques de arcilla. Estamos desarrollando un sistema para la coccion de tabiques de arcilla para alcanzar temperaturas entre 900 grados centigradosy 1050 grados centigrados; estas temperaturas son suficientemente altas para cocer tabiques o productos ceramicos similares. El presente articulo describe el diseno y caracterizacion de los componentes de un horno solar para la coccion de tabiques de arcilla con una camara con dimensiones internas de 0.48 * 0.61 *× 0.64 m. Para dirigir los rayos solares a la camara de coccion, un heliostato

  11. EDITORIAL Solar harvest Solar harvest

    Demming, Anna

    2010-12-01

    The first observations of the photoelectric effect date back to the early 19th century from work by Alexandre Edmond Becquerel, Heinrich Hertz, Wilhelm Hallwachs and J J Thomson. The theory behind the phenomena was clarified in a seminal paper by Einstein in 1905 and became an archetypical feature of the wave-particle description of light. A different manifestation of quantised electron excitation, whereby electrons are not emitted but excited into the valence band of the material, is what we call the photoconductive effect. As well as providing an extension to theories in fundamental physics, the phenomenon has spawned a field with enormous ramifications in the energy industry through the development of solar cells. Among advances in photovoltaic technology has been the development of organic photovoltaic technology. These devices have many benefits over their inorganic counterparts, such as light-weight, flexible material properties, as well as versatile materials' synthesis and low-cost large-scale production—all highly advantageous for manufacturing. The first organic photovoltaic systems were reported over 50 years ago [1], but the potential of the field has escalated in recent years in terms of efficiency, largely through band offsetting. Since then, great progress has been made in studies for optimising the efficiency of organic solar cells, such as the work by researchers in Germany and the Netherlands, where investigations were made into the percentage composition and annealing effects on composites of poly(3-hexylthiophene) (P3HT) and the fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) [2]. Hybrid devices that aim to exploit the advantages of both inorganic and organic constituents have also proven promising. One example of this is the work reported by researchers in Tunisia and France on a systematic study for optimising the composition morphology of TiO2 nanoparticles in poly(N-vinylcarbazole) (PVK), which also led to insights

  12. Tiempo para un cambio

    Woltjer, L.

    1987-06-01

    En la reunion celebrada en diciembre dei ano pasado informe al Consejo de mi deseo de terminar mi contrato como Director General de la ESO una vez que fuera aprobado el proyecto dei VLT, que se espera sucedera hacia fines de este aAo. Cuando fue renovada mi designacion hace tres aAos, el Consejo conocia mi intencion de no completar los cinco aAos dei contrato debido a mi deseo de disponer de mas tiempo para otras actividades. Ahora, una vez terminada la fase preparatoria para el VLT, Y habiendose presentado el proyecto formalmente al Consejo el dia 31 de marzo, y esperando su muy probable aprobacion antes dei termino de este ano, me parece que el 10 de enero de 1988 presenta una excelente fecha para que se produzca un cambio en la administracion de la ESO.

  13. Solar Bicycle

    SRIDHAR. S

    2011-07-01

    Full Text Available The running costs of the present vehicles are rising day by day hence common man is looking for an alternate mode of transport, with low fuel and maintenance cost. Solar bicycle is an attempt to meet these needs. It is an environmentally sustainable and zero running cost vehicle. It uses photovoltaic cells to absorb energy from sunlight. The absorbed energy is stored in battery. The hub motor mounted on the rear wheel uses this energy to run the cycle. A fully charged battery gives a mileage of 15-20 km. It is also provided with manual pedaling which increases the cycle’s mileage further. Average speed of the cycle is 15-18 kmph.

  14. Solar flares

    Zirin, H.

    1974-01-01

    A review of the knowledge about solar flares which has been obtained through observations from the earth and from space by various methods. High-resolution cinematography is best carried out at H-alpha wavelengths to reveal the structure, time history, and location of flares. The classification flares in H alpha according to either physical or morphological criteria is discussed. The study of flare morphology, which shows where, when, and how flares occur, is important for evaluating theories of flares. Consideration is given to studies of flares by optical spectroscopy, radio emissions, and at X-ray and XUV wavelengths. Research has shown where and possibly why flares occur, but the physics of the instability involved, of the particle acceleration, and of the heating are still not understood.

  15. Atmosfera modificada e refrigeração para conservação pós-colheita da nêspera 'Fukuhara'

    Juliana Sanches

    2011-01-01

    Full Text Available A rápida perda de qualidade pós-colheita limita a comercialização da nêspera no mercado de frutas frescas. Neste sentido, este trabalho teve por objetivo avaliar os efeitos da utilização de atmosfera modificada na conservação pós-colheita da nêspera 'Fukuhara' armazenada sob refrigeração (1 °C / 90% UR. Para tanto, os frutos (≈450 g foram acondicionados em bandejas de poliestireno e embalados em dois tipos de filme: polietileno de baixa densidade (PEBD, 50 µm e polipropileno (PP, 30 µm, sendo, em seguida, armazenados a 1 °C / 90% UR. Os frutos foram comparados a um controle que não envolveu a aplicação de filmes. As análises físico-químicas (perda de massa, firmeza, sólidos solúveis, pH e acidez titulável foram realizadas aos 15, 30 e 45 dias sob refrigeração, seguido por período de três dias sob condição ambiente (25 °C / 80% UR. A composição gasosa (O2/CO2 no espaço livre das embalagens, a incidência de podridões e de manchas escuras na epiderme dos frutos também foram avaliadas. Os resultados mostraram que a utilização de filme PEBD e PP para a conservação pós-colheita da nêspera, apesar de ser eficaz na redução da perda de massa e não alterar a cidez titulável, o pH e a firmeza dos frutos, não é indicada para o aumento do período de conservação, pois deprecia sua qualidade devido a condições de anaerobiose e elevada incidência de podridões.

  16. Combinatoria para la escuela

    Sarmiento, Benjamín; Fernández, Felipe

    2014-01-01

    Con este cursillo se pretende mostrar a los asistentes que el análisis combinatorio no es una temática exclusiva para los que se inician en el estudio de las probabilidades y que no se requiere llegar a ese nivel, para empezar a conocer los principios combinatorios y las reglas básicas de esta rama. Por eso se ha seleccionado un conjunto de problemas y situaciones que se puedan llevar a la escuela. A lo largo del cursillo se propondrán situaciones clásicas relacionadas con los principios y re...

  17. Instalaciones para hotel rural

    Roig Riera, José Antonio

    2015-01-01

    El presente proyecto cuenta con la información necesaria para el desarrollo de las instalaciones de un hotel rural. Dichas instalaciones son; la eléctrica, la de agua caliente sanitaria, las telecomunicaciones y la climatización. En el apartado de la instalación eléctrica, se han calculado todos los cables necesarios para el correcto funcionamiento del hotel, partiendo de las potencias demandadas en cada punto de consumo. Se ha calculado la línea general de alimentación, acomet...

  18. Instrucciones para autores

    Cramer, Thomas

    2012-01-01

    Instrucciones para autoresNota preliminar: ¡Es de suma importancia que antesde enviar cualquier documento a la Revista GeologíaColombiana, lea y cumpla cuidadosamente cada uno delos subíndices de las Normas para autores!A partir del Volumen 35 (2010) recibimos artículosprincipalmente a través del sistema digital enhttp://www.revistas.unal.edu.co/index.php/geocol/index.Si quiere enviar un artículo, por favor regístrese comoAutor en el menú INGRESAR (aquí pueden registrarsetambién evaluadores u...

  19. A Solar Energy Bibliography.

    Guthrie, David L.; Riley, Robert A.

    This document contains 5,000 references to literature through 1976 dealing with various aspects of solar energy. Categories are established according to area of solar research. These categories include: (1) overview; (2) measurement; (3) low-range solar energy collection (below 120 degrees C); (4) intermediate-range solar energy collection (120…

  20. Solar Thermal Propulsion Concept

    2004-01-01

    Harnessing the Sun's energy through Solar Thermal Propulsion will propel vehicles through space by significantly reducing weight, complexity, and cost while boosting performance over current conventional upper stages. Another solar powered system, solar electric propulsion, demonstrates ion propulsion is suitable for long duration missions. Pictured is an artist's concept of space flight using solar thermal propulsion.

  1. Analysis of the methods for the achievement of comfort conditions of humidity and temperature in energetically efficient designs; Analisis de los mtodos para lograr condiciones de confort higrotermico en disenos energeticamente eficientes

    Mesa A., N. A.; Morillon G., D. [Division de Estudios de Posgrado de la Facultad de Arquitectura, Universidad Nacional Autonoma de Mexico (Mexico)

    1997-12-31

    , boxeo, basquetbol, voleibol, gimnasia, aerobics y esgrima. Al mismo tiempo se encuesto a sus ocupantes acerca de la sensacion termica que experimentaban al realizar dichas actividades. Los resultados obtenidos en las encuestas se compararon con los reportados por otros investigadores, mediante tablas y diagramas psicometricos, como valores optimos para el confort termico. Como conclusiones se tuvo que los metodos graficos y matenaticos analizados, tienen como base una actividad sedentaria, por lo cual, al utilizarlos para el diseno espacios, de distintas actividades, se presentan condiciones de disconfort, con la consecuente necesidad de aire acondicionado, lo cual implica consumo de energia y el pago de la misma, y por ultimo, es necesario realizar una adaptacion de dichas herramientas, esto es considerar la actividad que se realizara en los edificios.

  2. A solar neutrino loophole: standard solar models

    The salient aspects of the existence theorem for a unique solution to a system of linear of nonlinear first-order, ordinary differential equations are given and applied to the equilibrium stellar structure equations. It is shown that values of pressure, temperature, mass and luminosity are needed at one point - and for the sun, the logical point is the solar radius. It is concluded that since standard solar model calculations use split boundary conditions, a solar neutrino loophole still remains: solar model calculations that seek to satisfy the necessary condition for a unique solution to the solar structure equations suggest a solar interior quite different from that deduced in standard models. This, in turn, suggests a theory of formation and solar evolution significantly different from the standard theory. (orig.)

  3. Proyecto de licencia de actividades con sus correspondientes instalaciones (contra incendios, baja tensión y solar fotovoltaica), y estudio de la gestión de residuos y seguridad en la instalación de las máquinas, para una nave industrial destinada a exposición, venta y reparación de automóviles

    Villa Ceña, Javier

    2009-01-01

    En el presente proyecto de final de carrera se pretende reflejar todo el proceso, la normativa y las condiciones que hay que cumplir para poner en marcha la actividad de exposición, venta y reparación de automóviles en una nave industrial situada en Caldes de Montbui (Barcelona). Para ello se realiza el procedimiento necesario y se detallan todos los trámites para obtener la licencia municipal para la actividad, cumpliendo con la normativa y el proceso específico en este cas...

  4. Solar geometry tool applied to systems and bio-climatic architecture; Herramienta de geometria solar aplicada a sistemas y arquitectura bio-climatica

    Urbano, Antonio; Matsumoto, Yasuhiro; Aguilar, Jaime; Asomoza Rene [CIMVESTAV-IPN, Mexico, D.F (Mexico)

    2000-07-01

    The present article shows the annual solar path, by means of graphic Cartesian, as well as the use of these, taken as base the astronomical, geographical antecedents and of the place. These graphs indicate the hours of sun along the day, month and year for the latitude of 19 Celsius degrees north, as well as the values of radiation solar schedule for the most important declines happened annually (equinoxes, solstices and the intermediate months). These graphs facilitate the user's good location to evaluate inherent obstacles of the environment and to determine in the place, the shades on the solar equipment or immovable (mountains, tree, buildings, windows, terraces, domes, et cetera), the hours of sun or the radiation for the wanted bio-climatic calculation. The present work is a tool of place engineering for the architects, designers, manufactures, planners, installers, energy auditors among other that require the use of the solar energy for anyone of its multiple applications. [Spanish] El presente articulo, muestra las trayectorias solares anules, mediante graficas cartesianas, asi como la utilizacion de estas, tomando como base los antecedentes astronomicos, geograficos y del lugar. Estas graficas indican las horas del sol a lo largo del dia, mes y ano para la latitud de 19 grados Celsius norte, asi como los valores de radiacion solar horaria para las declinaciones mas importantes ocurridas anualmente (equinoccios, solsticios y los meses intermedios). Estas graficas facilitan la ubicacion optima del usuario para evaluar obstaculos inherentes del entorno y determinar en el sitio, las sombras sobre los equipos solares o inmuebles (montanas, arboles, edificios, ventanas, terrazas, domos, etc.), las horas de sol o bien la radiacion para el calculo bio-climatico deseado. El presente trabajo es una herramienta de Ingenieria de sitio para los Arquitectos, Disenadores, Constructores, Proyectistas, Instaladores, Auditores Energeticos entre otros, que requieran el

  5. Planta fotovoltaica para vivienda rural

    Tartaglia, Morgana; Magariello, Antonio

    2009-01-01

    El presente proyecto se pone el objetivo de satisfacer la necesidad de suministro eléctrico para una vivienda rural. Se supone que dicha vivienda no tenga enlace a la red eléctrica, y por lo tanto se ha optado para un sistema de generación alternativo: una planta fotovoltaica. Para implementar los cálculos se han utilizado tres software: Excell y Matlab, para los estudios de funciones, y foto-RED para la simulación del comportamiento energético de la vivienda y para el cálcu...

  6. Solar engine system

    This paper reports the revolutionary solar engine system in Universiti Teknologi Malaysia (UTM). The solar engine is a single cylinder stirling engine driven by solar thermal energy. A first prototype solar engine has been built and demonstrated. A new-concept non-imaging focusing heliostat and a recently invented optical receiver are used in the demonstration. Second generation of prototype solar engine is described briefly. In this paper, the solar engine system development is reported. Measurement for the first prototype engine speed, temperature and specifications are presented. The benefits and potential applications for the future solar engine system, especially for the electricity generating aspect are discussed. (Author)

  7. Tempo para aprender vs tempo para brincar

    Correia, Ana Rita Coelho

    2016-01-01

    Relatório de Estágio apresentado à Escola Superior de Educação de Paula Frassinetti para a obtenção de grau de Mestre em Educação Pré-Escolar e Ensino do 1º Ciclo do Ensino Básico Esta investigação surge da reflexão sobre a urgência atual, generalizada por parte de muitos pais e encarregados de educação, bem como de algumas instituições, no sentido de escolarizar as crianças precocemente, com vista a que estas possam chegar ao ensino básico “mais preparadas”, esquecendo-se muitas ...

  8. Photovoltaic solar concentrator

    Nielson, Gregory N.; Cruz-Campa, Jose Luis; Okandan, Murat; Resnick, Paul J.; Sanchez, Carlos Anthony; Clews, Peggy J.; Gupta, Vipin P.

    2015-09-08

    A process including forming a photovoltaic solar cell on a substrate, the photovoltaic solar cell comprising an anchor positioned between the photovoltaic solar cell and the substrate to suspend the photovoltaic solar cell from the substrate. A surface of the photovoltaic solar cell opposite the substrate is attached to a receiving substrate. The receiving substrate may be bonded to the photovoltaic solar cell using an adhesive force or a metal connecting member. The photovoltaic solar cell is then detached from the substrate by lifting the receiving substrate having the photovoltaic solar cell attached thereto and severing the anchor connecting the photovoltaic solar cell to the substrate. Depending upon the type of receiving substrate used, the photovoltaic solar cell may be removed from the receiving substrate or remain on the receiving substrate for use in the final product.

  9. Solar workshops financial incentives

    None

    1979-01-01

    Ten one-day workshops were held across the United States. Information in this workbook is compiled in conjunction with those workshops. The following discussions are included: solar as a fuel (history); why alternative fuels are being sought today; the need for conservation; advantages of solar energy; the potential of solar energy; why solar energy is not more widely used; a definition of solar; how solar can help meet energy demands; Federal policies and programs; what solar technologies exist today that can be effectively utilized (thermal applications, fuels from biomass, solar electric). Additional information is presented in three attachments: Energy-Conserving Methods; Domestic Policy Review of Solar Energy; and DOE Secretary's Annual Report to Congress-Solar Section. (MCW)

  10. PERFORMANCE EVALUATION OF SOLAR COLLECTORS USING A SOLAR SIMULATOR

    M. Norhafana; Ahmad Faris Ismail; Z. A. A. Majid

    2015-01-01

    Solar water heating systems is one of the applications of solar energy. One of the components of a solar water heating system is a solar collector that consists of an absorber. The performance of the solar water heating system depends on the absorber in the solar collector. In countries with unsuitable weather conditions, the indoor testing of solar collectors with the use of a solar simulator is preferred. Thus, this study is conducted to use a multilayered absorber in the solar collector of...

  11. Aprendizaje cooperativo para ELE

    Cassany, Daniel

    2004-01-01

    Presentación sucinta para docentes de español como lengua extranjera del conjunto de propuestas metodológicas conocidas bajo la denominación aprendizaje cooperativo : origen, fundamentación, principales principios psicopedagógicos y algunas propuestas prácticas.

  12. Solar collector array

    Hall, John Champlin; Martins, Guy Lawrence

    2015-09-06

    A method and apparatus for efficient manufacture, assembly and production of solar energy. In one aspect, the apparatus may include a number of modular solar receiver assemblies that may be separately manufactured, assembled and individually inserted into a solar collector array housing shaped to receive a plurality of solar receivers. The housing may include optical elements for focusing light onto the individual receivers, and a circuit for electrically connecting the solar receivers.

  13. Development of Solar Research

    Wittmann, Axel D.; Wolfschmidt, Gudrun; Duerbeck, Hilmar W.

    Originally based on a workshop on “Development of Solar Research”, held in Freiburg/Breisgau, this book contains articles on megalithic structures, the Nebra sky-disk, ancient sun cults, the observation of sunspots, the photography of the sun during eclipses, eclipse maps and expeditions, solar telescopes, solar physics during the Nazi era, archives of solar observations, scientific ballooning for solar research, site-testing on the Canary Islands, as well as on international cooperation.

  14. The solar house of CRESESB: seven years of success

    Galdino, Marco Antonio; Souza, Hamilton Moss de, E-mail: marcoag@cepel.br

    2005-07-01

    The solar house is located in the facilities of CEPEL - Centro de Pesquisas de Energia Eletrica (Electric Power Research Centre) at Fundao Island, Rio de Janeiro, Brazil. It is powered by a stand-alone PV system and is operated by CRESESB - Centro de Referencia para Energia Solar e Eolica Sergio de Salvo Brito (Reference Centre for Solar and Wind Energy Sergio de Salvo Brito) as a demonstration centre. The solar house was built in 1997, and during seven years of operation it received about 9.000 visitors (up to middle 2004). The present paper shares some aspects of the experience gained with the solar house, including technical details of the systems installed, the experience in operation and maintenance, and the divulgation and training of personnel so far obtained. (author)

  15. Some quantity aspects of the solar radiation in Mexicali, B.C., Mexico; Algunos aspectos cuantitativos de la radiacion solar en Mexicali, B.C., Mexico

    Garcia Cueto; Rafael [Instituto de Ingenieria, U.A.B.C., Mexicali, Baja California (Mexico)

    2000-07-01

    Study of the global solar radiation is very useful for assesing the potential efficiency of systems designed for solar energy utilization. This paper explore some aspects of solar in Mexicali, B.C., Mexico, analysis of the monthly averages global solar radiation and general atmospheric transparency for the year 1998 are discussed. The statistical distribution of the clearness index is determined using histograms of frequencies. The percentage number of days with solar radiation values bellow a certain value is analyzed and discussed. The period of successive days having radiation less than 10 MJ/m{sup 2} dia-1 and 13 MJ/m{sup 2} dia{sup -}1 is examined and presented graphically. [Spanish] El estudio de la radiacion solar global es muy util para evaluar la eficiencia potencial de sistemas que en su diseno esten basados en la utilizacion de energia solar. En particular, en este articulo se exploran algunos aspectos cuantitativos de la radiacion solar en Mexicali, B.C., Mexico: se analizan los promedios mensuales de radiacion solar global y la transparencia atmosferica para el ano de 1998. Se determina la distribucion estadistica del indice de claridad usando histogramas de frecuencias. Se analizan y discuten el porcentaje de dias con valores de radiacion solar inferiores a cierto valor y se presentan graficamente el periodo de dias sucesivos que tienen valores de radiacion menores a 10 MJ/m{sup 2} dia{sup -}1 y 13MJ/m{sup 2} dia{sup -}1.

  16. Estudio de aprovechamiento energético en las viviendas mediante energía solar

    Nunes, Guillermo Gutiérrez; Ana Maria A C Rocha

    2011-01-01

    En la construcción de nuevos edificios surge la idea de una construcción energéticamente eficiente. El objetivo es optimizar los recursos energéticos en nuestros hogares y para ello planteamos dos instalaciones a realizar: energía solar térmica (para producción de agua caliente sanitaria) y energía solar fotovoltaica (para generación de corriente eléctrica). En este artículo se trata de calcular el dimensionamiento de ambas instalaciones en función de la ubicación y las caracte...

  17. Influencia del color y forma del colector solar en el secado de semillas de soya

    Gemma Domínguez Calvo; Yanoy Morejón Mesa; Chaumel C. Travieso Ruiz

    2015-01-01

    Esta investigación se desarrolló en el Instituto Nacional de Ciencias Agrícolas, con el objetivo de determinar la inÀuencia del color y la forma del colector solar en el proceso de secado de semillas de soya, empleándose un secador solar artesanal, para lo cual se plantearon las bases teórico-metodológicas y se utilizaron tres tipos de colectores solares para el desarrollo de la investigación, obteniéndose como principales resultados que el colector de mayor e¿ciencia fue el colector I (tr...

  18. Solar Club

    Solar Club

    2012-01-01

      Le  CERN Solar Club tiendra son Assemblée Générale le Mercredi  4 avril, à 18h00 dans la salle C, bat.61, 1e étage de 18h00  à  19h30. Grande table ronde avec  présentations de projets concernant toute forme d’Energie  Renouvelable par des membres du club,  et… par  VOUS, nos invités. Au programme : - L’E-push : petite remorque électrique, qui pousse vôtre vélo par Robert Becker. - Le Stockage Saisonnier Sous-Lacustre d’Energie Solaire (S3LES) par  William van Sprolant. - Compte-Rendu de plusieurs conférences récentes concernant les E.R. par Jacques Dupin. - VOS  Projets ou Sujets (contactez : paul.gelissen@orange.fr). - Partie «administrative» avec rapport d’activités, rapport fina...

  19. Utilização de diferentes embalagens plásticas para a conservação de produto minimamente processado de mangas 'Tommy Atkins' Different plastic packing for product conservation of mangoes 'Tommy Atkins' minimally processed

    Leandro Camargo Neves

    2009-09-01

    Full Text Available O trabalho objetivou a avaliação do potencial de conservação de mangas 'Tommy Atkins', minimamente processadas, utilizando-se de diferentes tipos de embalagens plásticas para o estabelecimento da atmosfera modificada (AM passiva. Os frutos, colhidos fisiologicamente maturos, apresentavam coloração roxo-esverdeada (1:1, teor de sólidos solúveis (SS 8,9 ± 0,3ºBrix, acidez titulável (AT de 1,25 ± 0,5g de ácido cítrico.100g de polpa-1 e massa fresca de 565 ± 25g. Os frutos, após a higienização em solução previamente acidificada (pH=3,0 de hipoclorito de sódio (NaOCl, a 100mg.L-1, por 10 minutos, e seccionados em pedaços de 0,02 ± 0,01m de largura e 0,05 ± 0,015m de comprimento, foram novamente higienizados em solução previamente acidificada de NaOCl (pH=3,0, a 10mg.L-1, por 3 minutos. Os pedaços, no formato de cubos de 0,02 ± 0,01m de largura e 0,05 ± 0,015m de comprimento, foram acondicionados em bandejas rígidas de poliestireno (0,19 x 0,12m, com capacidade para 250g e revestidas com os seguintes materiais: T1 (controle: filme perfurado de polietileno de baixa densidade (PEBD de 0,006mm (35 perfurações na superfície da embalagem, simulando a atmosfera convencional; T2: filme de PEBD de 0,020mm; T3: filme de PEBD de 0,060mm; T4: filme de PEBD de 0,080mm; T5: filme de polipropileno (PP de 0,052mm, e T6: bandeja rígida de polietileno tereftalato (PET, herméticas, com capacidade para 500 mL e dimensões de 0,22 x 0,12 x 0,11m, com tampa do mesmo material, sem perfurações e sem o revestimento plástico. Os tratamentos foram acondicionados em câmara frigorífica a 10 ± 0,5°C e 90 ± 3% de U.R, por 10 dias. Não foi constatada diferença significativa entre os tratamentos para as análises de SS e AT. A maior atividade microbiológica foi observada nos frutos embalados em filmes de PEBD de 0,006 e 0,020mm. As menores perdas de massa fresca, a melhor manutenção dos teores de ácido ascórbico, a ausência de

  20. Solar Design Workbook

    Franta, G.; Baylin, F.; Crowther, R.; Dubin, F.; Grace, A., Griffith, J.W.; Holtz, M.; Kutscher, C.; Nordham, D.; Selkowitz, S.; Villecco, M.

    1981-06-01

    This Solar Design Workbook presents solar building design applications for commercial buildir^s. The book is divided into four sections. The first section describes the variety of solar applications in buildings including conservation aspects, solar fundamentals, passive systems, active systems, daylighting, and other solar options. Solar system design evaluation techniques including considerations for building energy requirements, passive systems, active systems, and economics are presented in Section II. The third section attempts to assist the designer in the building design process for energy conservation and solar applications including options and considerations for pre-design, design, and post-design phases. The information required for the solar design proee^ has not been fully developed at this time. Therefore, Section III is incomplete, but an overview of the considerations with some of the design proces elements is presented. Section IV illustrates ease studies that utilize solar applications in the building design.

  1. Solar Adaptive Optics

    Thomas R. Rimmele

    2011-06-01

    Full Text Available Adaptive optics (AO has become an indispensable tool at ground-based solar telescopes. AO enables the ground-based observer to overcome the adverse effects of atmospheric seeing and obtain diffraction limited observations. Over the last decade adaptive optics systems have been deployed at major ground-based solar telescopes and revitalized ground-based solar astronomy. The relatively small aperture of solar telescopes and the bright source make solar AO possible for visible wavelengths where the majority of solar observations are still performed. Solar AO systems enable diffraction limited observations of the Sun for a significant fraction of the available observing time at ground-based solar telescopes, which often have a larger aperture than equivalent space based observatories, such as HINODE. New ground breaking scientific results have been achieved with solar adaptive optics and this trend continues. New large aperture telescopes are currently being deployed or are under construction. With the aid of solar AO these telescopes will obtain observations of the highly structured and dynamic solar atmosphere with unprecedented resolution. This paper reviews solar adaptive optics techniques and summarizes the recent progress in the field of solar adaptive optics. An outlook to future solar AO developments, including a discussion of Multi-Conjugate AO (MCAO and Ground-Layer AO (GLAO will be given.

  2. Introduction to solar cell production

    This book introduces solar cell production. It is made up eight chapters, which are summary of solar cell with structure and prospect of the business, special variable of solar cell on light of the sun and factor causing variable of solar cell, production of solar cell with surface texturing, diffusion, metal printing dry and firing and edge isolation, process of solar cell on silicone wafer for solar cell, forming of electrodes, introduction of thin film solar cell on operating of solar cell, process of production and high efficiency of thin film solar cell, sorting of solar cell and production with background of silicone solar cell and thin film solar cell, structure and production of thin film solar cell and compound solar cell, introduction of solar cell module and the Industrial condition and prospect of solar cell.

  3. VALORACIÓN DE UNA EMPRESA INSTALADORA DE CALEFACCIÓN Y AIRE ACONDICIONADO

    LÓPEZ MAS, ÁNGELA

    2014-01-01

    A día de hoy nos encontramos ante una situación financiera bastante crítica en nuestro país, y es que a pesar que desde el final de la crisis de principios de los años 90 la economía española tuvo más de una década expansiva de crecimiento sostenido, desde 2008 ha sufrido un gran decrecimiento dando paso a un largo período de recesión. Aunque previamente ya había diversos índices que mostraban síntomas de desaceleración, los daños se vieron reflejados en la economía a part...

  4. EL SOL COMO ALTERNATIVA PARA PRODUCIR ENERGÍA ELÉCTRICA: PROPUESTA PARQUE INFANTIL PARA LA CIUDAD DE CÚCUTA

    Karla Yohana Sánchez-Mojica

    2015-06-01

    Full Text Available La problemática del consumo descontrolado de energía eléctrica en el mundo y su constante crecimiento, es el escenario para el desarrollo de esta investigación que busca adelantar una propuesta para crear un parque infantil por parte de estudiantes de la Institución educativa Carlos Ramírez Paris, que funcione con energía solar como estrategia de sensibilización a la comunidad en general sobre el uso de energías limpias en la ciudad y en Colombia. Los estudiantes plantean la idea desde el programa ondas en una investigación que responde a una necesidad inmediata que los motiva como lo es un parque de diversiones público, sin embargo, es una alternativa para pensar en proyectos macro de desarrollo para la ciudad. Con esta propuesta se pretende diseñar una maqueta de un parque infantil a pequeña escala donde los estudiantes plasmen su iniciativa y se muestre la aplicación de la energía solar para el funcionamiento de algunos atractivos; una de los principales objetivos del proyecto es responder a la curiosidad de los estudiantes por saber cómo es el funcionamiento de este tipo de energía haciendo uso de los paneles solares.

  5. Consejos para pacientes

    M. Eulalia Lucio-Villegas Menéndez; Laura López González; M. Isabel Gutiérrez Pérez; Natalia Aresté Lluch; M. Luisa Morató Agustí; Santiago Pérez Cachafeiro

    2014-01-01

    En el cuidado de las heridas es tan importante saber qué hacer como saber qué no hacer. Lo primero es valorar la gravedad de la lesión y saber si es necesario acudir a un centro sanitario o no. Si la herida es simple, lo más recomendable es hacer una buena limpieza con suero o agua tras lavado de manos, realizando la desinfección de esta con el antiséptico más adecuado. Los antisépticos no deben usarse para la limpieza de las heridas (usar suero fisiológico o agua del grifo) ni para la cur...

  6. RADIATION MODEL FOR PREDICTING TEMPERATURE EVOLUTION IN SOLAR COOKER

    FARID CHEJNE

    2011-01-01

    Full Text Available Un modelo matemático que describe y simula el comportamiento térmico de una estufa solar fue desarrollado en base en la analogía de resistencias aléctricas. El modelo matemático incluye los tres diferentes mecanismos de transferencia de calor entre las diferentes superfi cies de la cocina solar y su entorno. El modelo matemático se utilizó para predecir la generación de entropía y de su efi ciencia; tambien, fue utilizado para evaluar los parametros de diseño de una estufa solar tipo caja. Los datos experimentales y teóricos fueron comparados satisfactoriamente.

  7. KINEMATICS AND VELOCITY ELLIPSOID OF THE SOLAR NEIGHBORHOOD WHITE DWARFS

    W. H. Elsanhoury

    2015-01-01

    Full Text Available Con el objeto de determinar la distribuci ́on de velocidades de las enanas blancas en el entorno solar utilizamos las componentes de la velocidad espacial. Utilizamos dos muestras, las m ́as cercanas que 20 y 25 pc. Ade m ́as, calculamos el movimiento solar y las dispersiones de velocidades para c uatro sub-muestras, a saber, DA, no-DA, enanas blancas calientes, y fr ́ıas. La com paraci ́on de nuestros resultados para las muestras de 20 y 25 pc da como resultado un a buena concordan- cia, mientras que los resultados de las comparaciones entre las otras sub-muestras no concuerdan. Se discute la dependencia de las dispersione s de velocidades y el movimiento solar de la composici ́on qu ́ımica y la temperatu ra efectiva

  8. Solar Thermal Propulsion

    Gerrish, Harold P., Jr.

    2003-01-01

    This paper presents viewgraphs on Solar Thermal Propulsion (STP). Some of the topics include: 1) Ways to use Solar Energy for Propulsion; 2) Solar (fusion) Energy; 3) Operation in Orbit; 4) Propulsion Concepts; 5) Critical Equations; 6) Power Efficiency; 7) Major STP Projects; 8) Types of STP Engines; 9) Solar Thermal Propulsion Direct Gain Assembly; 10) Specific Impulse; 11) Thrust; 12) Temperature Distribution; 13) Pressure Loss; 14) Transient Startup; 15) Axial Heat Input; 16) Direct Gain Engine Design; 17) Direct Gain Engine Fabrication; 18) Solar Thermal Propulsion Direct Gain Components; 19) Solar Thermal Test Facility; and 20) Checkout Results.

  9. SOLAR AIRCRAFT DESIGN

    RAHMATI, Sadegh; GHASED, Amir

    2015-01-01

    Abstract. Generally domain Aircraft uses conventional fuel. These fuel having limited life, high cost and pollutant. Also nowadays price of petrol and other fuels are going to be higher, because of scarcity of those fuels. So there is great demand of use of non-exhaustible unlimited source of energy like solar energy. Solar aircraft is one of the ways to utilize solar energy. Solar aircraft uses solar panel to collect the solar radiation for immediate use but it also store the remaining part ...

  10. Solar Energy Automobile

    HE Jianhua

    2014-01-01

    The thesis was to design a solar energy automobile, which is using solar power as energy re-source. At the moment, Finland was chosen as an example place. It was necessary to calculate the related data, which are the solar angle and the day length when designing the solar energy automobile. Also the seats and dashboard to improve the performance. Actually, in Finland it is possible to use solar energy automobile in summer. But in winter, the day length is so short and the solar constant i...

  11. California solar data manual

    Berdahl, P.; Grether, D.; Martin, M.; Wahlig, M.

    1978-01-01

    Factors that determined the data contents of the manual are presented. Estimates of errors in the data are provided, and the impact of these errors on solar design is discussed. The state is divided into 15 solar zones of roughly similar solar radiation conditions, which are illustrated along with page references to the most relevant solar and climate data. A guide to the data tables and graphs is provided, which are displayed under solar, climate, and sky charts. A guide is given to simplified design methods to predict performance and cost of solar heating and cooling systems. (MHR)

  12. Educando para la ignorancia

    Miguel Durán

    1996-06-01

    Full Text Available Más que describir una situación particular, los autores buscan con este escrito motivar al estudiante para que asuma posiciones críticas; así como dar un campanazo de alerta a los profesores, en relación a los conocimientos que transmiten a sus alumnos y la forma en que lo hacen; todo con el ánimo de generar verdaderos espacios de reflexión en la universidad.

  13. Arquitectura para el conocimiento

    Moreno-Torres Sánchez, Rosario; Sánchez Relinque, Javier

    2011-01-01

    La Málaga del siglo XXI se prepara para hacer de la investigación y de la innovación su nuevo sello. Entrevista a tres de los artífices de la urbanización y la edificación de la ampliación de Teatinos, clave en el eje sociocultural, científico y empresarial que conforman ya la capital, UMA y Parque Tecnológico.

  14. INICIATIVAS PARA EL CAMBIO

    César Alfonso Defrancisco-Larrañaga

    2013-07-01

    Full Text Available El planeta no atraviesa por su mejor momento en materia de conservación y renovación de sus recursos naturales. Claramente en los últimos tiempos los recursos hídricos han venido haciéndose cada vez menores; el hombre ha notado con preocupación y vivido en carne propia este fenómeno, que de no ser tratado a tiempo, podría atentar contra la existencia misma. Esto lo ha alentado a buscar métodos que sirvan como solución para contrarrestar éste mal y crear conciencia entre sus iguales, para así poder garantizar su permanencia y la de su entorno durante muchas generaciones. En países desarrollados del continente europeo y en algunos lugares de América del norte, el uso de sistemas de reutilización y tratamiento de aguas grises y aprovechamiento de las aguas lluvias se ha convertido en una constante y nos están dando las pautas para poder seguir el ejemplo y así de esta manera poder aportar a la causa ambiental y a su vez crear un ahorro en nuestros gastos mensuales de consumo.

  15. Technical and economical assessment of the options for energy saving in the library of the Universidad Autonoma Metropolitana-Azcapotzalco; Evaluacion tecnico economica de opciones para el ahorro de energia en la biblioteca de la Universidad Autonoma Metropolitana-Azcapotzalco

    Bratu, N.; Campero, E.; Dorantes, R.; Fuentes, V.; Figueroa, A.; Garcia, R.; Zekkour, A. [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico)

    1993-12-31

    techo es alto; por la instalacion de apagadores para mejorar la selectividad en el encendido y apagado de las lamparas, logrando asi un mejor aprovechamiento de la iluminacion natural; por la reduccion de la carga electrica destinada al aire acondicionado que se obtendra al incorporar tiros de aire inducido; y por una mejoria en la eficiencia de la instalacion electrica y de los balastros. Para las medidas que resultaron amortizables en tres anos se cuenta con el apoyo del Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) de la Comision Federal de Electricidad (CFE). Se espera que la ejecucion de las modificaciones se lleve a cabo en los meses de noviembre y diciembre de 1993 y evaluar los resultados durante 1994.

  16. PEROVSKITE SOLAR CELLS (REVIEW ARTICLE)

    Benli, Deniz Ahmet

    2015-01-01

    A solar cell is a device that converts sunlight into electricity. There are different types of solar cells but this report mainly focuses on a type of new generation solar cell that has the name organo-metal halide perovskite, shortly perovskite solar cells. In this respect, the efficiency of power conversion is taken into account to replace the dominancy of traditional and second generation solar cell fields by perovskite solar cells. Perovskite solar cell is a type of solar cell including a...

  17. Solar Thermal Rocket Propulsion

    Sercel, J. C.

    1986-01-01

    Paper analyzes potential of solar thermal rockets as means of propulsion for planetary spacecraft. Solar thermal rocket uses concentrated Sunlight to heat working fluid expelled through nozzle to produce thrust.

  18. Aeronet Solar Flux

    National Aeronautics and Space Administration — SolRad-Net (Solar Radiation Network) is an established network of ground-based sensors providing high-frequency solar flux measurements in quasi-realtime to the...

  19. Solar ultraviolet hazards

    The paper discussed the following subjects: the sources of ultraviolet radiation, solar ultraviolet radiation definition, effects of over exposure to solar ultraviolet radiation, exposure limits and radiation protection of this radiation

  20. Solar Dynamics Observatory

    National Aeronautics and Space Administration — A searchable database of all Solar Dynamics Observatory data including EUV, magnetograms, visible light and X-ray. SDO: The Solar Dynamics Observatory is the first...

  1. Solar Resource Assessment

    Renne, D.; George, R.; Wilcox, S.; Stoffel, T.; Myers, D.; Heimiller, D.

    2008-02-01

    This report covers the solar resource assessment aspects of the Renewable Systems Interconnection study. The status of solar resource assessment in the United States is described, and summaries of the availability of modeled data sets are provided.

  2. Solar renovation demonstration projects

    Bruun Joergensen, O. [ed.

    1998-10-01

    In the framework of the IEA SHC Programme, a Task on building renovation was initiated, `Task 20, Solar Energy in Building Renovation`. In a part of the task, Subtask C `Design of Solar Renovation Projects`, different solar renovation demonstration projects were developed. The objective of Subtask C was to demonstrate the application of advanced solar renovation concepts on real buildings. This report documents 16 different solar renovation demonstration projects including the design processes of the projects. The projects include the renovation of houses, schools, laboratories, and factories. Several solar techniques were used: building integrated solar collectors, glazed balconies, ventilated solar walls, transparent insulation, second skin facades, daylight elements and photovoltaic systems. These techniques are used in several simple as well as more complex system designs. (au)

  3. Solar engineering 1994

    This volume of 83 papers constitutes the Proceedings of the 1994 International Solar Energy Conference held March 27--30, 1994 in San Francisco, California. The Conference was jointly sponsored by the Solar Energy Division of the American Society of Mechanical Engineers, The Japan Society of Mechanical Engineers and the Japan Solar Energy Society. This is the fourth cooperation between ASME, JSME and JSES in cosponsoring the International Solar Energy Conference. The papers cover a wide range of solar technologies from low temperature solar ponds and desalinization to high temperature concentrators for space applications and central receivers for terrestrial power generation. Other topics covered include solar detoxification of hazardous waste, dish Stirling systems, solar cooling, photovoltaics, building energy analysis and conservation, simulation, and testing and measurement techniques. All papers were indexed separately for the data base

  4. Solar control design package

    1978-08-01

    Information used in the evaluation of design of Solar Control's solar heating and cooling system controller and the Solarstat is presented. System performance specifications, design data brochures, and detailed design drawings are presented.

  5. Solar Indices - Sunspot Numbers

    National Oceanic and Atmospheric Administration, Department of Commerce — Collection includes a variety of indices related to solar activity contributed by a number of national and private solar observatories located worldwide. This...

  6. Origin of solar magnetism

    Choudhuri, Arnab Rai

    2010-01-01

    The most promising model for explaining the origin of solar magnetism is the flux transport dynamo model, in which the toroidal field is produced by differential rotation in the tachocline, the poloidal field is produced by the Babcock--Leighton mechanism at the solar surface and the meridional circulation plays a crucial role. After discussing how this model explains the regular periodic features of the solar cycle, we come to the questions of what causes irregularities of solar cycles and w...

  7. Solar mobile power supply

    Hu, Libian

    2014-01-01

    The solar mobile power supply is a comprehensive energy saving and environment protective product. Besides, it consists of solar panels, storage battery and controller as well as other important components. Based on the traditional solar charging circuit, this solar power supply combines the 5V USB interface and 12V adjustable circuit as well as the 220V inverter and power adapter to greatly improve the function of the power system.

  8. Beijing Tsinghua Solar Ltd.

    2006-01-01

    Beijing Tsinghua Solar Ltd. is backed by Tsinghua University, one of the most prestigious universities in China. Tsinghua Solar invented "graded Al-N/Al selective coating," which is the key technology of all-glass evacuated solar collector tubes. The company owns the independent intellectual property rights over the key technology of all-glass vacuum solar water heaters. The registered capital of the company is 153.5 mil-

  9. Solar effects on communications

    This paper focuses on potential effects of solar phenomena on communication systems used by the electric utility industry. It begins with a discussion of solar phenomena fundamentals and discussion of the interaction between solar emissions and the earth's ionosphere and magnetosphere. It continues with a discussion of the resulting impacts on communication systems including radio, satellite, wireline, fiber optic, and powerline systems and concludes with a discussion of mitigation techniques and a call for observers to report suspected solar impact experiencexperiences

  10. Solar Energy Technician/Installer

    Moore, Pam

    2007-01-01

    Solar power (also known as solar energy) is solar radiation emitted from the sun. Large panels that absorb the sun's energy as the sun beats down on them gather solar power. The energy in the rays can be used for heat (solar thermal energy) or converted to electricity (photovoltaic energy). Each solar energy project, from conception to…

  11. Solar disk sextant

    Sofia, S.; Chiu, H.-Y.; Maier, E.; Schatten, K. H.; Minott, P.; Endal, A. S.

    1984-01-01

    This paper presents the conceptual design of an instrument, called the solar disk sextant, to be used in space to measure the shape and the size of the sun and their variations. The instrumental parameters required to produce sufficient sensitivity to address the problems of solar oblateness, solar pulsations, and global size changes of climatic importance are given.

  12. Solar pond technology

    J. Srinivasan

    1993-01-01

    Solar pond technology has made substantial progress in the last fifteen years. This paper reviews the basic principles of solar ponds and the problems encountered in their operation and maintenance. The factors which influence the technical and economic viability of solar ponds for thermal applications and power generation have been discussed.

  13. Implementing Rooftop Solar Projects

    Sinha, Pankaj; Sethi, Shaina

    2015-01-01

    This brief showcases the challenges of structuring and developing rooftop solar photovoltaic projects using the public-private partnership model. The case study focuses on the experience of the International Finance Corporation in assisting the government of Gujarat, India, in developing the rooftop solar PV model through the implementation of two citywide, grid-connected rooftop solar PV ...

  14. Solar cell concentrating system

    This study reviews fabrication techniques and testing facilities for different solar cells under concentration which have been developed and tested. It is also aimed to examine solar energy concentrators which are prospective candidates for photovoltaic concentrator systems. This may provide an impetus to the scientists working in the area of solar cell technology

  15. Experimenting with Solar Energy

    Roman, Harry T.

    2004-01-01

    Over the past 25 years, the author has had the opportunity to study the subject of solar energy and to get involved with the installation, operation, and testing of solar energy systems. His work has taken him all over the United States and put him in contact with solar experts from around the world. He has also had the good fortune of seeing some…

  16. Solar tracking system

    Okandan, Murat; Nielson, Gregory N.

    2016-07-12

    Solar tracking systems, as well as methods of using such solar tracking systems, are disclosed. More particularly, embodiments of the solar tracking systems include lateral supports horizontally positioned between uprights to support photovoltaic modules. The lateral supports may be raised and lowered along the uprights or translated to cause the photovoltaic modules to track the moving sun.

  17. Nanostructured Organic Solar Cells

    Radziwon, Michal Jędrzej; Rubahn, Horst-Günter; Madsen, Morten

    Recent forecasts for alternative energy generation predict emerging importance of supporting state of art photovoltaic solar cells with their organic equivalents. Despite their significantly lower efficiency, number of application niches are suitable for organic solar cells. This work reveals...... the principles of bulk heterojunction organic solar cells fabrication as well as summarises major differences in physics of their operation....

  18. para mejorar el %R

    Alfredo Díaz Mata

    2001-01-01

    Full Text Available En este trabajo se revisan dos indicadores técnicos bursátiles que están estrechamente relacionados, el oscilador estocástico %K de Lane y el oscilador %R de Williams; asimismo, se evalúa el uso de dos mecanismos asociados con el primero y que no suelen utilizarse con el %R: el proceso de frenado (slowing y el uso de un promedio móvil del propio oscilador estocástico como disparadores de señales de compra y de venta. Realizando simulaciones con 27 acciones y el Índice de Precios y Cotizaciones de la Bolsa Mexicana de Valores se verifica la hipótesis principal y se comprueba que, efectivamente, en muchos casos, el uso del proceso de frenado con el oscilador %R de Williams permite tomar mejores decisiones. Por otro lado, se concluye que de los dos disparadores de señales el que mejor funciona, tanto para %K como para %R es el uso de cotas inferior y superior. Este artículo surgió en el curso de una investigación sobre el análisis técnico bursátil de acciones que se puede realizar en su totalidad por computadora y que, esencialmente, excluye el análisis gráfico. Uno de los propósitos del estudio es determinar si es posible, y bajo qué mecanismos, establecer un sistema de análisis bursátil que le permita al inversionista tomar decisiones de inversión en acciones en la Bolsa Mexicana de Valores sin tener que emplear la considerable cantidad de tiempo que es necesario para el análisis gráfico tradicional. Durante este estudio se realizó un análisis preliminar de unos 120 indicadores técnicos para, por un lado, conocerlos con cierto detalle y, por otra parte, aislar aquellos que prometían ser de utilidad para el objetivo de la investigación. Fue en este proceso cuando se detectó que existen dos indicadores que están relacionados y que permiten un análisis por separado que tiene, cuando menos, dos ventajas. En primer lugar está el placer que da a quien gusta de estos temas encontrarse con indicadores que, de acuerdo

  19. Comunicar para la salud

    Lic. Eva Bocco

    1998-01-01

    Con este trabajo quiero plantearles una inquietud en torno al rol que nos cabe a los comunicadores en el área de la salud desde la perspectiva de la comunicación para la salud. ¿Se puede pensar la salud pública desvinculada de la comunicación? ¿La comunicación es posible sin la existencia de salud en la comunidad? ¿Qué puede hacer un comunicador en el ministerio de salud? ¿Puede un estado desarrollar políticas de salud sin la presencia de la comunicación?

  20. Instrucciones para los autores

    Ana Silvia Bermúdez

    2011-01-01

    La Revista Colombiana de Química es una publicación científica, arbitrada del Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia que acepta contribuciones provenientes de investigación en las diversas áreas de la química. El contenido de los artículos debe ser original, inédito y no debe haber sido enviado, total o parcialmente, para publicación a otra revista. La redacción asume el derecho de reproducción de los trabajos aceptados. Su publicación en otro medio re...

  1. Renovación de los equipos de producción de calor en un hotel : apoyo con energía solar

    Fernández Fernández, Carlos

    2011-01-01

    El conjunto del presente documento dotará a todo el inmueble de las infraestructuras necesarias para la instalación del sistema de energía solar térmica. Asimismo, los condicionantes que mueven con especial cuidado el objeto de este proyecto son: - Elaborar un documento con carácter didáctico incorporando fundamentos de tecnología solar térmica y una memoria descriptiva en la que se detalle los distintos procedimientos de cálculo para la obtención de la cobertura solar para su posterior compa...

  2. Estudio técnico-económico de una central híbrida solar-ciclo combinado (ISCC)

    Hidalgo Cebrián, Lucía

    2012-01-01

    El objetivo de este proyecto es estudiar la viabilidad de una central híbrida solar-ciclo combinado (ISCC) en Argelia. La planta consiste en un ciclo combinado basado en dos turbinas de gas de 42 MW cada una y una turbina de vapor de 60 MW de los cuales 20 MW se deben al campo solar, siendo la potencia eléctrica de la planta 144 MW. El campo solar se ha dimensionado para obtener una contribución solar del 5% sobre la producción eléctrica anual de la instalación. La tecnología solar utilizada ...

  3. Central solar fotovoltaica de 5 MW con sistema de posicionamiento autónomo

    Martínez Porras, Abel

    2010-01-01

    El objeto del proyecto realizado es el diseño de una central solar fotovoltaica (huerta solar) con sistema de posicionamiento autónomo de 5 MW de potencia nominal (5.796 MWp potencia de pico) con todos los elementos necesarios para la puesta en funcionamiento del parque fotovoltaico, desde la configuración fotovoltaica, la instalación eléctrica, etc. En un solar de uso rustico en el término municipal de L’Ametlla de Mar, al sur de Tarragona. La finalidad de la huerta solar e...

  4. Solar Proton Events in Six Solar Cycles

    Vitaly, Ishkov

    Based on materials the catalogs of solar proton events (SPE) in 1955 ‒ 2010 and list SPE for the current 24 solar cycle (SC) are examined confirmed SPE with E> 10 MeV proton flux in excess of 1 proton cm-2 s ster-1 (pfu) from Švestka and Simon’s (1955 - 1969) and 5 volumes Logachev’s (1970 - 2006) Catalogs of SPE. Historically thus it was formed, that the measurements of the proton fluxes began in the epoch “increased” solar activity (SC 18 ‒ 22), and includes transition period of the solar magnetic fields reconstruction from epoch “increased” to the epoch “lowered” solar activity (22 ‒ 23 SC). In current 24 SC ‒ first SC of the incipient epoch of “lowered” SA ‒ SPE realize under the new conditions, to that of previously not observed. As showed a study of five solar cycles with the reliable measurements of E> 10 MeV proton flux in excess of 1 pfu (1964 - 2013): ‒ a quantity of SPEs remained approximately identical in SC 20, 21, somewhat decreased in the initial solar cycle of the solar magnetic fields reconstruction period (22), but it returned to the same quantity in, the base for the period of reconstruction, SC 23. ‒ Into the first 5 years of the each solar cycle development the rate of the proton generation events noticeably increased in 22 cycles of solar activity and returned to the average in cycles 23 and 24. ‒ Extreme solar flare events are achieved, as a rule, in the solar magnetic fields reconstruction period (August - September 1859; June 1991; October ‒ November 2003.), it is confirmed also for SPE: the extreme fluxes of solar protons (S4) except one (August 1972) were occurred in period of perestroika (SC 22 and 23). This can speak, that inside the epochs SA, when the generation of magnetic field in the convective zone works in the steady-state regime, extreme SPE are improbable. ‒ The largest in the fluxes of protons (S3, S4) occur in the complexes of the active regions flare events, where magnetic field more

  5. Solar energy in Israel

    The state of Israel has been a pioneer in the solar energy development and utilization since it was founded. In the 50's solar domestic home heaters became commercially available. At the same time research work has been started in different areas of solar energy, which led to more advanced solar systems for additional applications. The presentation includes some details of commercial utilization of solar energy and a brief description of the main Research and Development projects in industry, universities and research institutes. (authors)

  6. Solar energy conversion systems

    Brownson, Jeffrey R S

    2013-01-01

    Solar energy conversion requires a different mind-set from traditional energy engineering in order to assess distribution, scales of use, systems design, predictive economic models for fluctuating solar resources, and planning to address transient cycles and social adoption. Solar Energy Conversion Systems examines solar energy conversion as an integrative design process, applying systems thinking methods to a solid knowledge base for creators of solar energy systems. This approach permits different levels of access for the emerging broad audience of scientists, engineers, architects, planners

  7. Solar energy collector

    Knowles, G.W.; Sangesland, O.E.; Vroom, H.J.; Madey, R.W.

    1977-11-22

    A solar energy collector is described for collecting, concentrating, and utilizing solar energy. It includes a target for transferring solar energy into another useable energy form and a reflector positioned to increase the amount of solar energy reaching the target and prevent solar energy from escaping around the target. The target includes a transparent envelope and a heat pipe containing a heat transfer fluid. The heat pipe has an evaporator portion disposed within the transparent envelope and an emergent condenser portion with a flange forming a dry thermal interface with a manifold for conducting heat energy directly from the heat pipe to the manifold.

  8. Solar energy collector

    Knowles, G.W.; Sangesland, O.E.; Vroom, H.J.; Madey, R.W.

    1978-10-10

    A solar energy collector for collecting, concentrating, and utilizing solar energy is described including a target for transferring solar energy into another useable energy form and reflector positioned to increase the amount of solar energy reaching the target and prevent solar energy from escaping around the target, the target including in its preferred form a transparent envelope and a heat pipe containing a heat transfer fluid, the heat pipe having an evaporator portion disposed within the transparent envelope and an emergent condenser portion with a flange forming a dry thermal interface with a manifold for conducting heat energy directly from the heat pipe to the manifold.

  9. Application of solar energy

    Li, Jingcheng

    2010-01-01

    The purpose of the project is to learn the principle and application of solar energy and to know the situation of solar energy in China and build a solar farm in China . In the theoretical part of the project the main issue was to find out how to collect the solar energy and how to store solar energy. The information of the project was collected by using network and books. This work was completed in the following steps : to search information for the theory part, to analyze the data ...

  10. Solar Cycle #24 and the Solar Dynamo

    Pesnell, W. Dean; Schatten, Kenneth

    2007-01-01

    We focus on two solar aspects related to flight dynamics. These are the solar dynamo and long-term solar activity predictions. The nature of the solar dynamo is central to solar activity predictions, and these predictions are important for orbital planning of satellites in low earth orbit (LEO). The reason is that the solar ultraviolet (UV) and extreme ultraviolet (EUV) spectral irradiances inflate the upper atmospheric layers of the Earth, forming the thermosphere and exosphere through which these satellites orbit. Concerning the dynamo, we discuss some recent novel approaches towards its understanding. For solar predictions we concentrate on a solar precursor method, in which the Sun s polar field plays a major role in forecasting the next cycle s activity based upon the Babcock- Leighton dynamo. With a current low value for the Sun s polar field, this method predicts that solar cycle #24 will be one of the lowest in recent times, with smoothed F10.7 radio flux values peaking near 130+ 30 (2 4, in the 2013 timeframe. One may have to consider solar activity as far back as the early 20th century to find a cycle of comparable magnitude. Concomitant effects of low solar activity upon satellites in LEO will need to be considered, such as enhancements in orbital debris. Support for our prediction of a low solar cycle #24 is borne out by the lack of new cycle sunspots at least through the first half of 2007. Usually at the present epoch in the solar cycle (-7+ years after the last solar maximum), for a normal size following cycle, new cycle sunspots would be seen. The lack of their appearance at this time is only consistent with a low cycle #24. Polar field observations of a weak magnitude are consistent with unusual structures seen in the Sun s corona. Polar coronal holes are the hallmarks of the Sun s open field structures. At present, it appears that the polar coronal holes are relatively weak, and there have been many equatorial coronal holes. This appears

  11. "Colaborar para Competir"

    Martha Liliana Hijuelos-Cárdenas

    2016-08-01

    Full Text Available De acuerdo con Michael Porter, los Clusters se definen como “Una agrupación de empresas e instituciones relacionadas entre sí, pertenecientes a un mismo sector o segmento de mercado, que se encuentran próximas geográficamente y que colaboran para ser más competitivas”. Los Clusters son en última instancia una herramienta de competitividad basada en la cooperación de sus miembros, y es una de las estrategias recientes, en el país, para incrementar la productividad y competitividad y las apuestas productivas desde el nivel local. Y es precisamente esta cercanía geográfica de las empresas de un mismo sector, lo que a la vez que genera la competencia entre ellas, también les facilita el acceso a insumos y a conocimientos específicos y en última instancia les permite promover la innovación.

  12. A novel solar hot plate for cooking

    Rincon Mejia, Eduardo A; Osorio Jaramillo, Fidel A [Facultad de Ingenieria, UAEMex, Toluca, Edo. (Mexico)

    2000-07-01

    In Mexico and other developing countries, the use of firewood as combustible for cooking has contributed to deforestation and desertification of large zones. This is due to the lack of alternative combustibles for the poor inhabitants of the countryside and remote areas. In this paper, a new solar hot plate, intended for contributing to solve this problem, is presented. It can be used for cooking not only a great variety of prehispanic and traditional meals, like tortillas, fried meat and vegetables, but also hot cakes, bacon, eggs, steaks and fries. The hot plate solar cooker, called Tolocatzin, consists of a horizontal metallic plate, which is heated from both of its top and bottom surfaces by concentrated sun light from multicompound concentrator based on nonimaging optics, and built with nine ordinary plane glass-silvered, and two curved aluminum mirrors, so it can be manufactured easily in a small factory or at home. For an acceptance angle of 15 Celsius degrees, which allows the concentration of sun light without sun-tracking for about one hour, it can reach temperatures up to 240 Celsius degrees in a few minutes. This temperature is high enough for cooking almost all fried or grilled meals. The design was optimized using ray-trace procedures. The operational experience with early prototypes has shown that the Tolocatzin solar hot plate does an excellent cooking job and could really be massively used in sunny countries. [Spanish] En Mexico y otros paises en desarrollo, el uso de la madera como combustible para cocinar ha contribuido a la deforestacion y desertificacion de grandes zonas. Esto es debido a la falta de combustibles alternativos por parte de los habitantes pobres del campo y de areas remotas. En este articulo se presenta una nueva placa solar que tiene el proposito de contribuir a resolver este problema. Puede ser usada para cocinar no solamente una gran variedad de comidas prehispanicas y tradicionales, como tortillas, carne frita y verduras sino

  13. Photovoltaic solar concentrator

    Nielson, Gregory N.; Gupta, Vipin P.; Okandan, Murat; Watts, Michael R.

    2016-03-15

    A photovoltaic solar concentrator is disclosed with one or more transverse-junction solar cells (also termed point contact solar cells) and a lens located above each solar cell to concentrate sunlight onto the solar cell to generate electricity. Piezoelectric actuators tilt or translate each lens to track the sun using a feedback-control circuit which senses the electricity generated by one or more of the solar cells. The piezoelectric actuators can be coupled through a displacement-multiplier linkage to provide an increased range of movement of each lens. Each lens in the solar concentrator can be supported on a frame (also termed a tilt plate) having three legs, with the movement of the legs being controlled by the piezoelectric actuators.

  14. Solar energy modulator

    Hale, R. R. (Inventor); Mcdougal, A. R.

    1984-01-01

    A module is described with a receiver having a solar energy acceptance opening and supported by a mounting ring along the optic axis of a parabolic mirror in coaxial alignment for receiving solar energy from the mirror, and a solar flux modulator plate for varying the quantity of solar energy flux received by the acceptance opening of the module. The modulator plate is characterized by an annular, plate-like body, the internal diameter of which is equal to or slightly greater than the diameter of the solar energy acceptance opening of the receiver. Slave cylinders are connected to the modulator plate for supporting the plate for axial displacement along the axis of the mirror, therby shading the opening with respect to solar energy flux reflected from the surface of the mirror to the solar energy acceptance opening.

  15. Photovoltaic solar cell

    Nielson, Gregory N.; Gupta, Vipin P.; Okandan, Murat; Watts, Michael R.

    2015-09-08

    A photovoltaic solar concentrator is disclosed with one or more transverse-junction solar cells (also termed point contact solar cells) and a lens located above each solar cell to concentrate sunlight onto the solar cell to generate electricity. Piezoelectric actuators tilt or translate each lens to track the sun using a feedback-control circuit which senses the electricity generated by one or more of the solar cells. The piezoelectric actuators can be coupled through a displacement-multiplier linkage to provide an increased range of movement of each lens. Each lens in the solar concentrator can be supported on a frame (also termed a tilt plate) having three legs, with the movement of the legs being controlled by the piezoelectric actuators.

  16. Mars Solar Power

    Landis, Geoffrey A.; Kerslake, Thomas W.; Jenkins, Phillip P.; Scheiman, David A.

    2004-01-01

    NASA missions to Mars, both robotic and human, rely on solar arrays for the primary power system. Mars presents a number of challenges for solar power system operation, including a dusty atmosphere which modifies the spectrum and intensity of the incident solar illumination as a function of time of day, degradation of the array performance by dust deposition, and low temperature operation. The environmental challenges to Mars solar array operation will be discussed and test results of solar cell technology operating under Mars conditions will be presented, along with modeling of solar cell performance under Mars conditions. The design implications for advanced solar arrays for future Mars missions is discussed, and an example case, a Martian polar rover, are analyzed.

  17. Colapso: algunas cuestiones para Teotihuacan

    Moragas Segura, Natàlia

    2009-01-01

    En la literatura arqueológica, el uso del término Estdo para las sociedades antiguas se aplica profusamente desde la segunda mitad del siglo XIX. Alrededor de ello la academia de investigaciones ha desarrollado diversos modelos para comprender el modo de organización de dichas sociedades atentiendo a cuestiones políticas, económicas, medioambientales e ideológicas. La bibliogradia es ingente e inabarcable para un artículo, y tal vez incluso para un libro; por lo que no deben de tomarse estas ...

  18. Energía Solar Termofotovoltaica

    Martín Martín, Diego; Datas Medina, Alejandro; Algora del Valle, Carlos

    2008-01-01

    La energía solar fotovoltaica es una de las alternativas renovables más interesantes para afrontar el futuro energético del planeta desde el punto de vista de la sostenibilidad. Sin embargo, actualmente los sistemas fotovoltaicos comerciales son poco eficientes –aprovechan sólo el 10% de la radiación incidente– y económicamente menos atractivos que las fuentes de energía convencionales. En este trabajo se analizan las principales causas que limitan la eficiencia de conversión de radiación en ...

  19. Solar engineering of thermal processes

    Duffie, John A

    2013-01-01

    The updated fourth edition of the ""bible"" of solar energy theory and applications Over several editions, Solar Engineering of Thermal Processes has become a classic solar engineering text and reference. This revised Fourth Edition offers current coverage of solar energy theory, systems design, and applications in different market sectors along with an emphasis on solar system design and analysis using simulations to help readers translate theory into practice. An important resource for students of solar engineering, solar energy, and alternative energy as well

  20. Contratados peninsulares para Cuba

    Iglesias García, Fe

    1994-12-01

    Full Text Available Not available.

    Ante las presiones británicas, la metrópoli española y los ideólogos de los hacendados cubanos tuvieron que dar, desde la tercera década del siglo XIX, una respuesta a la previsible escasez de mano de obra esclava. El artículo estudia los sistemas de contrata implantados en la isla para abastecer de mano de obra blanca y barata a Cuba, deteniéndose particularmente la autora en el estudio de las condiciones de semiesclavitud que se escondían en las mencionadas contratas y en el perfil de los inmigrantes (profesiones, sexo, edad, procedencia....

  1. Requerimientos para aplicaciones web

    Oliveros, Alejandro; Wehbe, Ricardo; Rojo, Silvana del Valle; Rousselot, Julián

    2011-01-01

    El objetivo del presente proyecto es la elaboración de un conjunto de políticas, estándares, procesos, metodologías, técnicas, herramientas y métricas para aplicar en el desarrollo de aplicaciones Web, específicamente en la obtención y representación de los requerimientos que debe satisfacer el sistema o aplicación Web. Estos distintos elementos se desarrollarán en forma gradual y eventualmente se integrarán en un sitio Web que centralice toda la información. Hay varias líneas de investigació...

  2. Solar energy guide

    Many aspects with regard to the practical use of solar energy are discussed. This guide is aimed at informing local and regional administrators, committee members of housing corporations and public utilities and public relations officers on the possibilities to use solar energy. In chapter one an overview is given of the use of solar energy in the housing sector, the recreational sector, agricultural sector, industry, trade and other sectors. In the chapters two, three and four attention is paid to passive solar energy, active thermal solar energy and photovoltaic energy respectively. In the chapters five and six aspects concerning the implementation of solar energy systems in practice are discussed. First an outline of the parties involved in implementing solar energy is given: the municipality, the energy utility, the province, local authorities, advisors, housing constructors and the occupants of the buildings. Then attention is paid to the consequences of implementing solar energy for the building inspection and regulations, the finances, energy savings and the environment. In chapter seven an overview is given of the subsidy regulations of the European Community, the Dutch national and local governments. Chapter contains addresses of solar thermal systems, photovoltaic systems and other institutes operating in the field of solar energy, as well as the titles of a number of brochures and courses. 51 figs., 7 tabs., 86 refs

  3. Sistema distribuido para monitorización y control integrado de edificios

    Gomes, L.

    1999-02-01

    distribuido destinado a la monitorización y control integrado del edificio. El sistema puede también servir de apoyo para actividades económicas y servicios. El concepto de domot se presenta (domot = “domus" + "robot" como el tercer inquilino activo del edificio, coexistiendo con los usuarios y administradores siendo capaz de manejar recursos estando a disposición del otro usuario. El sistema se basa en la definición de dos tipos de modelo de estructura, que se utilizarán como referencia para las partes de hardware y software del sistema. El modelo de referencia de la parte software se basa en una red distribuida heterogénea de puestos de trabajo, ejecutando un conjunto de procesos en que la comunicación entre ellos es basada en el paradigma del cliente-servidor. El modelo de referencia de la parte hardware se basa en una estructura con dos niveles de redes; el primero se utiliza para la comunicación entre los puestos de trabajo de alto nivel (destinados a la supervisión y monitorización y el segundo estará destinado a garantizar la comunicación entre los controladores de bajo nivel. Estos dos tipos de modelos constituyen la base para una implementación robusta y abierta de una infraestructura que pueda ser utilizada para las actividades económicas y también para los deseos de usuarios individuales, permitiendo progresos sinérgicos. La interfaz de usuario, que se puede utilizar en cualquier lugar del mundo en que esté disponible una conexión TCP-IP, está estructurada jerárquicamente; se proporcionan información y diálogos específicos para la monitorización y control de los diversos tipos de dispositivos y gestión de los mismos y sistemas que estén instalados en el edificio. Los sistemas ya integrados son: detección de intrusos, CCTV y PABX. El control de acceso, aire acondicionado y calefacción, iluminación se añadirán en un futuro próximo.

  4. PERFORMANCE EVALUATION OF SOLAR COLLECTORS USING A SOLAR SIMULATOR

    M. Norhafana

    2015-11-01

    Full Text Available Solar water heating systems is one of the applications of solar energy. One of the components of a solar water heating system is a solar collector that consists of an absorber. The performance of the solar water heating system depends on the absorber in the solar collector. In countries with unsuitable weather conditions, the indoor testing of solar collectors with the use of a solar simulator is preferred. Thus, this study is conducted to use a multilayered absorber in the solar collector of a solar water heating system as well as to evaluate the performance of the solar collector in terms of useful heat of the multilayered absorber using the multidirectional ability of a solar simulator at several values of solar radiation. It is operated at three variables of solar radiation of 400 W/m2, 550 W/m2 and 700 W/m2 and using three different positions of angles at 0º, 45º and 90º. The results show that the multilayer absorber in the solar collector is only able to best adapt at 45° of solar simulator with different values of radiation intensity. At this angle the maximum values of useful heat and temperature difference are achieved. KEYWORDS: solar water heating system; solar collector; multilayered absorber; solar simulator; solar radiation 

  5. Solar Thermal Energy; Energia Solar Termica

    Perez-Martinez, M.; Cuesta-Santianes, M. J.; Cabrera Jimenez, J. A.

    2008-07-01

    Approximately, 50 % of worldwide primary energy consumption is done in the form of heat in applications with a temperature lower than 250 degree centigree (low-medium temperature heat). These data clearly demonstrate the great potential of solar thermal energy to substitute conventional fossil fuels, which are becoming more expensive and are responsible for global warming. Low-medium temperature solar thermal energy is mainly used to obtain domestic hot water and provide space heating. Active solar thermal systems are those related to the use of solar thermal collectors. This study is dealing with low temperature solar thermal applications, mainly focusing on active solar thermal systems. This kind of systems has been extensively growing worldwide during the last years. At the end of 2006, the collector capacity in operation worldwide equalled 127.8 GWth. The technology is considered to be already developed and actions should be aimed at favouring a greater market penetration: diffusion, financial support, regulations establishment, etc. China and USA are the leading countries with a technology based on evacuated tube collectors and unglazed collectors, respectively. The rest of the world markets are dominated by the flat glazed collectors technology. (Author) 15 refs.

  6. Hybrids of Solar Sail, Solar Electric, and Solar Thermal Propulsion for Solar-System Exploration

    Wilcox, Brian H.

    2012-01-01

    Solar sails have long been known to be an attractive method of propulsion in the inner solar system if the areal density of the overall spacecraft (S/C) could be reduced to approx.10 g/sq m. It has also long been recognized that the figure (precise shape) of useful solar sails needs to be reasonably good, so that the reflected light goes mostly in the desired direction. If one could make large reflective surfaces with reasonable figure at an areal density of approx.10 g/sq m, then several other attractive options emerge. One is to use such sails as solar concentrators for solar-electric propulsion. Current flight solar arrays have a specific output of approx. 100W/kg at 1 Astronomical Unit (AU) from the sun, and near-term advances promise to significantly increase this figure. A S/C with an areal density of 10 g/sq m could accelerate up to 29 km/s per year as a solar sail at 1 AU. Using the same sail as a concentrator at 30 AU, the same spacecraft could have up to approx. 45 W of electric power per kg of total S/C mass available for electric propulsion (EP). With an EP system that is 50% power-efficient, exhausting 10% of the initial S/C mass per year as propellant, the exhaust velocity is approx. 119 km/s and the acceleration is approx. 12 km/s per year. This hybrid thus opens attractive options for missions to the outer solar system, including sample-return missions. If solar-thermal propulsion were perfected, it would offer an attractive intermediate between solar sailing in the inner solar system and solar electric propulsion for the outer solar system. In the example above, both the solar sail and solar electric systems don't have a specific impulse that is near-optimal for the mission. Solar thermal propulsion, with an exhaust velocity of the order of 10 km/s, is better matched to many solar system exploration missions. This paper derives the basic relationships between these three propulsion options and gives examples of missions that might be enabled by

  7. Water disinfection with solar radiation; Desinfeccion del agua con radiacion solar

    Martin, Alejandra; Cortes, Juana E; Rodriguez, Miriam; Mundo, Alfredo; Vazquez, Sandra [Instituto Mexicano de Tecnologia del Agua, Jiutepec, Morelos (Mexico); Estrada, Claudio A [Centro de Investigacion en Energia, Temixco, Morelos (Mexico)

    2000-07-01

    Water disinfection by exposure to solar radiation is a low cost and easy application option to rural communities. The treatment of water can be done using plastic bags or plastic bottles of two litters setting on a reflective material. The efficient of the plastic bottles is lower than the one plastic bags, but the plastic bottles have a much better control of the treated water avoiding its recontamination. In order to increase the efficiency of disinfection using plastic bottles, two solar concentrators, using flat mirrors, were designed and built. Effluent water from a treatment plant of residual waters was used for the testing. Several comparison were carried out taking into account the position of the concentrators, the transparency of the bottles and the bags. The results show that using the concentrator that adjust its position to the sun every hour, a 100% disinfection is obtained in 4 hours of direct exposure to the sun rays in a sunny day. The period of time can be reduced up to 2 hours, if instead using transparent bottles, the bottles are black painted at their bottom half. With these results, the basis to design a cheap concentrator of easy construction to be used in rural communities have been settle. [Spanish] La desinfeccion del agua por exposicion a la luz solar fotodesinfeccion es una opcion de bajo costo y facil aplicacion para las comunidades rurales. El tratamiento puede llevarse a cabo utilizando bolsas o botellas de plastico transparente de dos litros de capacidad colocadas sobre un material reflejante. Las botellas son menos eficientes que las bolsas, pero permiten un mejor control del agua tratada evitando su recontaminacion. Para aumentar la eficiencia de la desinfeccion utilizando las botellas, se disenaron y construyeron dos concentradores solares de espejos planos que permitieron disminuir el tiempo de exposicion requerido cuando se utilizan estas. Para las pruebas de desinfeccion se utilizo agua del efluente de una planta de tratamiento

  8. Pre-diseño de una instalación mixta fotovoltaica-térmica para una vivienda

    Gaspar Novillo, Gonzalo

    2014-01-01

    El objetivo del presente proyecto es realizar el pre-diseño de una instalación solar mixta fotovoltaica-térmica para satisfacer la demanda eléctrica para iluminación y para parte de las necesidades de energía térmica para agua caliente de una vivienda. El proyecto define las condiciones técnicas de la instalación a partir de la radiación solar registrada en la localización elegida. Además de incluir el estudio económico y los planos correspondientes que indican la viabilidad del mismo. Como...

  9. Non-linear absorption for concentrated solar energy transport

    Jaramillo, O. A; Del Rio, J.A; Huelsz, G [Centro de Investigacion de Energia, UNAM, Temixco, Morelos (Mexico)

    2000-07-01

    In order to determine the maximum solar energy that can be transported using SiO{sub 2} optical fibers, analysis of non-linear absorption is required. In this work, we model the interaction between solar radiation and the SiO{sub 2} optical fiber core to determine the dependence of the absorption of the radioactive intensity. Using Maxwell's equations we obtain the relation between the refractive index and the electric susceptibility up to second order in terms of the electric field intensity. This is not enough to obtain an explicit expression for the non-linear absorption. Thus, to obtain the non-linear optical response, we develop a microscopic model of an harmonic driven oscillators with damp ing, based on the Drude-Lorentz theory. We solve this model using experimental information for the SiO{sub 2} optical fiber, and we determine the frequency-dependence of the non-linear absorption and the non-linear extinction of SiO{sub 2} optical fibers. Our results estimate that the average value over the solar spectrum for the non-linear extinction coefficient for SiO{sub 2} is k{sub 2}=10{sup -}29m{sup 2}V{sup -}2. With this result we conclude that the non-linear part of the absorption coefficient of SiO{sub 2} optical fibers during the transport of concentrated solar energy achieved by a circular concentrator is negligible, and therefore the use of optical fibers for solar applications is an actual option. [Spanish] Con el objeto de determinar la maxima energia solar que puede transportarse usando fibras opticas de SiO{sub 2} se requiere el analisis de absorcion no linear. En este trabajo modelamos la interaccion entre la radiacion solar y el nucleo de la fibra optica de SiO{sub 2} para determinar la dependencia de la absorcion de la intensidad radioactiva. Mediante el uso de las ecuaciones de Maxwell obtenemos la relacion entre el indice de refraccion y la susceptibilidad electrica hasta el segundo orden en terminos de intensidad del campo electrico. Esto no es

  10. Solution-Processed Transition Metal Oxides for Organic Solar Cells

    Teran Escobar, Gerardo

    2014-01-01

    Las celdas solares orgánicas se han convertido en una promesa para la producción de energía a bajo costo, y su potencial se refleja en los enormes esfuerzos para mejorar su eficiencia. En los últimos 30 años, esta tecnología ha crecido enormemente, con prototipos de laboratorio mostrando eficiencia mayor que 10 % . El continuo desarrollo de polímeros semiconductores, materiales de amortiguamiento, y el conocimiento profundo sobre el intercambio electrónico en las interfaces, han sido las pri...

  11. Solar Chemical Peculiarities?

    Allende-Prieto, C

    2006-01-01

    Several investigations of FGK stars in the solar neighborhood have suggested that thin-disk stars with an iron abundance similar to the Sun appear to show higher abundances of other elements, such as silicon, titanium, or nickel. Offsets could arise if the samples contain stars with ages, mean galactocentric distances, or kinematics, that differ on average from the solar values. They could also arise due to systematic errors in the abundance determinations, if the samples contain stars that are different from the Sun regarding their atmospheric parameters. We re-examine this issue by studying a sample of 80 nearby stars with solar-like colors and luminosities. Among these solar "analogs", the objects with solar iron abundances exhibit solar abundances of carbon, silicon, calcium, titanium and nickel.

  12. Semiconductor solar superabsorbers.

    Yu, Yiling; Huang, Lujun; Cao, Linyou

    2014-01-01

    Understanding the maximal enhancement of solar absorption in semiconductor materials by light trapping promises the development of affordable solar cells. However, the conventional Lambertian limit is only valid for idealized material systems with weak absorption, and cannot hold for the typical semiconductor materials used in solar cells due to the substantial absorption of these materials. Herein we theoretically demonstrate the maximal solar absorption enhancement for semiconductor materials and elucidate the general design principle for light trapping structures to approach the theoretical maximum. By following the principles, we design a practical light trapping structure that can enable an ultrathin layer of semiconductor materials, for instance, 10 nm thick a-Si, absorb > 90% sunlight above the bandgap. The design has active materials with one order of magnitude less volume than any of the existing solar light trapping designs in literature. This work points towards the development of ultimate solar light trapping techniques. PMID:24531211

  13. Solar thermal aircraft

    Bennett, Charles L. (Livermore, CA)

    2007-09-18

    A solar thermal powered aircraft powered by heat energy from the sun. A heat engine, such as a Stirling engine, is carried by the aircraft body for producing power for a propulsion mechanism, such as a propeller. The heat engine has a thermal battery in thermal contact with it so that heat is supplied from the thermal battery. A solar concentrator, such as reflective parabolic trough, is movably connected to an optically transparent section of the aircraft body for receiving and concentrating solar energy from within the aircraft. Concentrated solar energy is collected by a heat collection and transport conduit, and heat transported to the thermal battery. A solar tracker includes a heliostat for determining optimal alignment with the sun, and a drive motor actuating the solar concentrator into optimal alignment with the sun based on a determination by the heliostat.

  14. Solar Renewable Energy. Teaching Unit.

    Buchanan, Marion; And Others

    This unit develops the concept of solar energy as a renewable resource. It includes: (1) an introductory section (developing understandings of photosynthesis and impact of solar energy); (2) information on solar energy use (including applications and geographic limitations of solar energy use); and (3) future considerations of solar energy…

  15. SOLAR EFFECTS ON BUILDING DESIGN.

    Building Research Inst., Inc., Washington, DC.

    A REPORT OF A PROGRAM HELD AS PART OF THE BUILDING RESEARCH INSTITUTE 1962 SPRING CONFERENCE ON THE SOLAR EFFECTS ON BUILDING DESIGN. TOPICS DISCUSSED ARE--(1) SOLAR ENERGY DATA APPLICABLE TO BUILDING DESIGN, (2) THERMAL EFFECTS OF SOLAR RADIATION ON MAN, (3) SOLAR EFFECTS ON ARCHITECTURE, (4) SOLAR EFFECTS ON BUILDING COSTS, (5) SELECTION OF…

  16. Protetores solares Sunscreens

    Juliana Flor; Marian Rosaly Davolos; Marcos Antonio Correa

    2007-01-01

    Health problems related to UV radiation can be minimized by the appropriate use of sunscreens. Different kinds of sunscreens are reported in the literature, even though there is a misleading denomination among them and few discussions are presented about how they work. This paper describes some important aspects in order to understand sunscreen phenomena such as: solar radiation effect, type of solar filters, protection mechanism, formulations and solar protection factor (SPF). Moreover the i...

  17. Solar absorption cooling

    Kim, D.-S.

    2007-01-01

    As the world concerns more and more on global climate changes and depleting energy resources, solar cooling technology receives increasing interests from the public as an environment-friendly and sustainable alternative. However, making a competitive solar cooling machine for the market still remains a challenge to the academic and industrial communities. In an effort to meet this challenge, this thesis reports the R&D activities carried out for the development of a new solar cooling machine,...

  18. Solar photocatalyzed process economics

    This paper describes the Solar Energy Research Institute (SERI) cost estimates for solar water detoxification systems based on the best available information as of October 1990. Comparative costs are also provided for competitive conventional technologies which are presently applied in the water detoxification market. Although costs for solar photocatalytic systems are presently higher than those of competitive technologies, cost and performance improvements should lead to cost competitiveness by 1995

  19. Profile in solar

    This article reviews an innovative solar hot water heater and its inventor/entrepreneur. It includes the inventor's strategy for developing and marketing the product and his ideas on the state of the solar industry in general. There is a brief description of the solar water heater which has as prominent features its skylight-like appearance, resistance to freeze damage, simplicity and low cost

  20. CHOOSING SOLAR PHOTOVOLTAIC PLANT

    Vinnikov A. V.; Denisenko E. A.; Dolobenko D. V.

    2015-01-01

    Promising is the direction and, above all, in matters of energy saving and energy efficiency of Autonomous systems of power supply, the use of renewable sources-newable energy as a major source of energy for consumers in remote areas. Here priority is given to solar energy. Since solar radiation can be change place not only in heat and electrical. The article contains three main structural schematics of electricity supply with solar power plants. The features of their work are disclosed, as w...

  1. Solar radiation conversion system

    Kittl, E.

    1975-12-30

    A system for converting solar radiation into useful electrical energy is provided. The system includes a silicon cell and solar radiation conversion means integral with or spaced from the silicon cell. The solar radiation conversion means is characterized by a band-emission spectrum that provides a good spectral match with the spectral response of a silicon cell. 6 Claims, 3 Drawing Figures (Official Gazette)

  2. Solar energy emplacement developer

    Mortensen, Michael; Sauls, Bob

    1991-01-01

    A preliminary design was developed for a Lunar Power System (LPS) composed of photovoltaic arrays and microwave reflectors fabricated from lunar materials. The LPS will collect solar energy on the surface of the Moon, transform it into microwave energy, and beam it back to Earth where it will be converted into usable energy. The Solar Energy Emplacement Developer (SEED) proposed will use a similar sort of solar energy collection and dispersement to power the systems that will construct the LPS.

  3. Integrated Solar Water Heater

    Yassien, Husam Naufal Saleh

    2012-01-01

    ABSTARCT: Nowadays, water heating by using the solar energy has been spread all over the world. The studies on solar water heating system were stimulated the researchers due to the scarcity of natural energy resources, like fossil fuel and natural gas as well as the rising and rapidly fluctuating prices for these resources. The purpose of this study is to design and manufacture a new storage domestic electric water heater with solar collector in North Cyprus. In this project, the normal cyli...

  4. Solar Neutrino Data, Solar Model Uncertainties and Neutrino Oscillations

    Krauss, Lawrence M.; Gates, Evalyn; White, Martin

    1992-01-01

    We incorporate all existing solar neutrino flux measurements and take solar model flux uncertainties into account in deriving global fits to parameter space for the MSW and vacuum solutions of the solar neutrino problem.

  5. Simulação computacional aplicada ao desenvolvimento de embalagens para bananas Computational simulation for the development of packages for bananas

    Roberto Funes Abrahão

    2008-03-01

    Full Text Available Este trabalho propõe um método de projeto de embalagem para produtos hortícolas, buscando uma otimização integrada dos aspectos geométricos, estruturais e térmicos, ligados à facilitação do resfriamento e armazenamento refrigerado. Para o dimensionamento e otimização estrutural, foi utilizado o Método dos Elementos Finitos implementado pelo programa ANSYS, obtendo-se oito modelos virtuais de embalagens, com 10% e 14% de área efetiva de aberturas e geometria quadrada, retangular e circular. Para o desenvolvimento dos experimentos, que avaliaram a relação da área de aberturas com o tempo de sete-oitavos de resfriamento, foram construídos protótipos de tábuas de madeira (Pinnus elliotti de reflorestamento. Nas embalagens, foram acondicionados aproximadamente 13 kg de banana variedade Nanica (Musa cavendishii, cultivar nanica, resfriada num túnel de ar forçado (vazão de ar de 0,32 m³ s-1, temperatura de 8,0±1,2ºC e umidade relativa de 84,5±2,6%. O tempo de resfriamento também foi comparado com aquele obtido quando a mesma quantidade de frutas foi resfriada em embalagens de papelão (2,5% de área efetiva de abertura e madeira (18% de área efetiva de abertura. Os resultados demonstraram que, entre os protótipos propostos, não houve diferença significativa no tempo de resfriamento dos frutos acondicionados nas embalagens desenvolvidas, sendo o tempo médio de resfriamento de 40,71±2,81 min. Na comparação com as embalagens de papelão e madeira, houve diferenças significativas, sendo que as embalagens comerciais tiveram tempos de resfriamento de 1,25 e 2 vezes maiores. Concluiu-se que a simulação estrutural computacional, aliada a algoritmos de otimização, além de procedimentos experimentais ligados à cadeia do frio, são recursos promissores no auxílio de projetos para embalagens de transporte de produtos hortícolas.This study proposes a methodology for designing boxes for agricultural products based on

  6. Solar coal gasification

    Gregg, D. W.; Aiman, W. R.; Otsuki, H. H.; Thorsness, C. B.

    1980-01-01

    A preliminary evaluation of the technical and economic feasibility of solar coal gasification has been performed. The analysis indicates that the medium-Btu product gas from a solar coal-gasification plant would not only be less expensive than that from a Lurgi coal-gasification plant but also would need considerably less coal to produce the same amount of gas. A number of possible designs for solar coal-gasification reactors are presented. These designs allow solar energy to be chemically stored while at the same time coal is converted to a clean-burning medium-Btu gas.

  7. Solar Tracking System

    Nguyen, Nam

    2016-01-01

    The goal of this thesis was to develop a laboratory prototype of a solar tracking system, which is able to enhance the performance of the photovoltaic modules in a solar energy system. The operating principle of the device is to keep the photovoltaic modules constantly aligned with the sunbeams, which maximises the exposure of solar panel to the Sun’s radiation. As a result, more output power can be produced by the solar panel. The work of the project included hardware design and implemen...

  8. Passive solar technology

    Watson, D

    1981-04-01

    The present status of passive solar technology is summarized, including passive solar heating, cooling and daylighting. The key roles of the passive solar system designer and of innovation in the building industry are described. After definitions of passive design and a summary of passive design principles are given, performance and costs of passive solar technology are discussed. Passive energy design concepts or methods are then considered in the context of the overall process by which building decisions are made to achieve the integration of new techniques into conventional design. (LEW).

  9. CERN... Solar Style

    2001-01-01

    Inventor William van Sprolant presenting the Solar Club's latest invention, the solar fountain. The CERN Solar Club is giving new meaning to the phrase 'fun in the sun' with their most recently developed contraption, the Solar Fountain. The Fountain was presented to the public just outside of Restaurant 1 on Wednesday October, 17th and uses solar energy to run a water pump at its base to propel a golden plastic ball up into the air. As lovely as the fountain is, the funny thing about it is that the height of the water jet and the ball are an artistic method of measuring the amount of solar power being captured by the photovoltaique panel (no batteries included). The day it was presented started out cloudy, but as the afternoon wore on, the weather brightened and the fountain jumped to life. William van Sprolant, the Solar Fountain's inventor, had great fun with the fountain in front of a group of visiting children swiveling the solar panel in multiple directions. 'Everyone who installs solar panels worrie...

  10. Solar Hydrogen Reaching Maturity

    Rongé Jan

    2015-09-01

    Full Text Available Increasingly vast research efforts are devoted to the development of materials and processes for solar hydrogen production by light-driven dissociation of water into oxygen and hydrogen. Storage of solar energy in chemical bonds resolves the issues associated with the intermittent nature of sunlight, by decoupling energy generation and consumption. This paper investigates recent advances and prospects in solar hydrogen processes that are reaching market readiness. Future energy scenarios involving solar hydrogen are proposed and a case is made for systems producing hydrogen from water vapor present in air, supported by advanced modeling.

  11. Solar photovoltaic electric technology

    This paper describes the status and outlook of different solar photovoltaic power generation technologies and resources. Technical characteristics of solar photovoltaic systems are discussed. Also treated are environmental impacts and costs of solar photovoltaic generating technology which are expected to be available between now and the year 2020. Some institutional and other barriers are pointed out which might delay the deployment of solar photovoltaic power generating systems. Finally, recommendations of technology development priorities and the need and opportunities for international cooperation is stressed. (author). 26 refs, 2 figs, 3 tabs

  12. Solar neutrino experiments

    Hampel, W. [Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany)

    1996-11-01

    The present status of experimental solar neutrino research is reviewed. Updated results from the Homestake, Kamiokande, GALLEX and SAGE detectors all show a deficit when compared to recent standard solar model calculations. Two of these detectors, GALLEX and SAGE, have recently been checked with artificial {sup 51}Cr neutrino sources. It is shown that astrophysical scenarios to solve the solar neutrino problems are not favoured by the data. There is hope that the results of forthcoming solar neutrino experiments can provide the answers to the open questions. (author) 6 figs., 3 tabs., 36 refs.

  13. Solar energy storage

    Sorensen, Bent

    2015-01-01

    While solar is the fastest-growing energy source in the world, key concerns around solar power's inherent variability threaten to de-rail that scale-up . Currently, integration of intermittent solar resources into the grid creates added complication to load management, leading some utilities to reject it altogether, while other operators may penalize the producers via rate increases or force solar developers to include storage devices on-site to smooth out power delivery at the point of production. However these efforts at mitigation unfold, it is increasingly clear to parties on all sides th

  14. Harnessing solar heat

    Norton, Brian

    2013-01-01

    Systems engineered by man to harness solar heat in a controlled manner now include a diverse range of technologies each serving distinctive needs in particular climate contexts. This text covers the breadth of solar energy technologies for the conversion of solar energy to provide heat, either as the directly-used output or as an intermediary to other uses such as power generation or cooling. It is a wholly updated, extended and revised version of “Solar Energy Thermal Technology” first published in 1992. The text draws on the own author’s research and that of numerous colleagues and

  15. Solar Cooker Technological Change

    Ahmad, Bashir

    1997-01-01

    The challenges which solar cooking technology is facing right now is discussed. Based on a field study in Madras and Gujarat, it is asserted that there is an important incompatibility between the technology and the every day real-life conditions of the "users" of solar cooker. An evaluation report...... on a solar cooker technology in Burkina Faso supports the findings of the study. It is concluded that the users and other important actors have to be incorporated in the technological development process of solar cookers in the future....

  16. Long Island Solar Farm

    Anders, R.

    2013-05-01

    The Long Island Solar Farm (LISF) is a remarkable success story, whereby very different interest groups found a way to capitalize on unusual circumstances to develop a mutually beneficial source of renewable energy. The uniqueness of the circumstances that were necessary to develop the Long Island Solar Farm make it very difficult to replicate. The project is, however, an unparalleled resource for solar energy research, which will greatly inform large-scale PV solar development in the East. Lastly, the LISF is a superb model for the process by which the project developed and the innovation and leadership shown by the different players.

  17. Rectenna solar cells

    Moddel, Garret

    2013-01-01

    Rectenna Solar Cells discusses antenna-coupled diode solar cells, an emerging technology that has the potential to provide ultra-high efficiency, low-cost solar energy conversion. This book will provide an overview of solar rectennas, and provide thorough descriptions of the two main components: the diode, and the optical antenna. The editors discuss the science, design, modeling, and manufacturing of the antennas coupled with the diodes. The book will provide concepts to understanding the challenges, fabrication technologies, and materials required to develop rectenna structures. Written by e

  18. EL SOL COMO ALTERNATIVA PARA PRODUCIR ENERGÍA ELÉCTRICA: PROPUESTA PARQUE INFANTIL PARA LA CIUDAD DE CÚCUTA

    Karla Yohana Sánchez-Mojica; Jhonathan Velandia; Sigifredo Chia

    2015-01-01

    La problemática del consumo descontrolado de energía eléctrica en el mundo y su constante crecimiento, es el escenario para el desarrollo de esta investigación que busca adelantar una propuesta para crear un parque infantil por parte de estudiantes de la Institución educativa Carlos Ramírez Paris, que funcione con energía solar como estrategia de sensibilización a la comunidad en general sobre el uso de energías limpias en la ciudad y en Colombia. Los estudiantes plantean la idea desde el pro...

  19. Pequenos para idade gestacional: fator de risco para mortalidade neonatal

    Almeida Márcia Furquim de; Jorge Maria Helena Prado de Mello

    1998-01-01

    OBJETIVO: Estudar as variáveis contempladas na Declaração de Nascimento (DN) como possíveis fatores de risco para nascimentos pequenos para a idade gestacional (PIG) e o retardo de crescimento intra-uterino como fator de risco para a mortalidade neonatal. MATERIAL E MÉTODO: As variáveis existentes na DN foram obtidas diretamente de prontuários hospitalares. Os dados referem-se a uma coorte de nascimentos obtida por meio da vinculação das declarações de nascimento e óbito, correspondendo a 2.2...

  20. Utilização de filmes de polietileno de baixa densidade(PEBD) para prolongar a vida pós-colheita de morangos, cv. oso grande The use of low density polyethylene packing to prolong the postharvest life of 'oso grande' strawberries

    Joel Donazzolo; Maurício Hunsche; Auri Brackmann; Alessandro Jaquiel Waclawovsky

    2003-01-01

    Desenvolveu-se um experimento com o objetivo de avaliar o efeito da atmosfera modificada (AM), utilizando filmes de polietileno de baixa densidade (PEBD), sobre a manutenção da qualidade de morangos (Fragaria ananassa L.), cv. Oso Grande, acondicionados em câmara frigorífica, a 0ºC, e em câmara de climatização, a 20ºC, simulando transporte/armazenamento refrigerado e o transporte/armazenamento convencional, sob altas temperaturas respectivamente. Os morangos foram acondicionados em bandejas p...

  1. Indústria solar térmica em Cabo Verde : potencialidade do mercado

    Nascimento, Cláusia Maria Fonseca da Rocha

    2008-01-01

    O presente trabalho pretende fazer uma análise do potencial do mercado Cabo-verdiano para a utilização da energia solar, através de algumas ferramentas de análise de mercado já conhecidas, nomeadamente as cinco forças de Porter, o Diamante de Porter, a análise PESTEL e a análise SWOT. O primeiro ponto que se pretende esclarecer é a questão: Será que Cabo Verde reúne as condições para ser considerado uma potencial mercado para a produção/ venda de sistemas solares para o a...

  2. The Finnish solar cluster

    NONE

    2012-07-01

    There are numerous drivers behind the increasing utilization of solar energy. Currently solar energy is a relatively small market in Finland but there are many visible signs of increasing interest towards solar technologies and solar energy. There are already some Finnish companies offering their products and services for the global solar market. Considering the high Finnish competence in various fields of technology, there should be no reason why more companies would not follow in the future. This report drafts the Finnish solar cluster in its current form, including both those companies that operate in and along the solar value chain as well as those who have the opportunity to promote solar implementation and utilization. Further, this report brings up existing solar-related strengths of Finnish companies and research including inverters and material technology as well as the identified main obstacles for large-scale solar expansion in Finland. In addition, this report will also list some key barriers for solar implementation identified during the study. The report will also look solar from an urban planning perspective and discuss about implementing solar into new and existing built environments, which extends the study further beyond the traditional solar value chain. In order to get insights into urban solar development in Finland, we have interviewed the following exerts for this work: Robert Eriksson from City of Espoo; Alpo Tani from City of Helsinki, Pauli Valimaki and Elina Seppanen from City of Tampere; Mika Pekkinen from Tampereen Saehkoelaitos; Maarit Tuomainen and Kimmo Ruokoniemi from SATO, Kaisa Kekki and Pellervo Matilainen from Skanska; Eero Vartiainen from Fortum; Jari Suominen from ST1 and Karin Wikman from Tekes. We would like to express our sincere thanks to the persons we interviewed for their support and ideas regarding the subject. This report relates to the Solar Energy Forum organized by the Finnish Funding Agency for Technology and

  3. Surface Meteorology and Solar Energy

    National Aeronautics and Space Administration — Surface Meteorology and Solar Energy data - over 200 satellite-derived meteorology and solar energy parameters, monthly averaged from 22 years of data, global solar...

  4. Make Your Own Solar Panel.

    Suzuki, David

    1992-01-01

    Presents an activity in which students make a simulated solar panel to learn about the principles behind energy production using solar panels. Provides information about how solar panels function to produce energy. (MCO)

  5. Leer para Creer

    Roberto Polanco-Carrasco

    2011-12-01

    Full Text Available Más allá de los prejuicios que se puedan alimentar en las aulas por -en ocasiones- brillantes exponentes de la clínica psicológica, resultaría difícil creer que exista hoy en día un profesional que se atreva a sostener que el ser humano es sólo mente, o argumentar que lo corporal o cerebral es secundario e incluso irrelevante en los pacientes con los que habitualmente se deberá tratar. De hacerlo simplemente sería un acto de ignorancia, sobretodo en un momento en que disponemos de evidencias diarias desde las neurociencias que dan para sostener la unidad mente-cuerpo como nunca antes en la historia del estudio de “lo psicológico”. La convicción de que los estudiantes deberán ser nutridos con las nociones básicas de los modernos estudios del cerebro debería reflejarse en la bibliografía de diversas asignaturas y estar presente en el espíritu central del quehacer académico como una manera de prevenir esta viciosa tendencia a ningunear aquello que se desconoce y que finalmente cegará a la hora de probar nuevas formas de ver “el síntoma”.

  6. para promover la salud

    Ma. del Consuelo Chapela

    2002-01-01

    Full Text Available Hablar de educación a distancia sustentada en el desarrollo de la cibernética obliga a reflexionar sobre sus definiciones, objetivos y medios, especialmente si pensamos en las necesidades de la fracción de población que no tiene acceso a las posibilidades que ofrece el desarrollo tecnológico. En este trabajo se presenta e ilustra con un ejemplo práctico, una perspectiva sobre las posibilidades de la educación a distancia desde las necesidades de la promoción de la salud entre grupos de población marginada en el mundo virtual. Se propone la creación de bibliotecas itinerantes regionales que pongan a disposición de la población con acceso limitado a la información, la tecnología comunicativa necesaria para apoyar los trabajos de promoción de la salud.

  7. Para-equilibrium phase diagrams

    Highlights: • A rapidly cooled system may attain a state of para-equilibrium. • In this state rapidly diffusing elements reach equilibrium but others are immobile. • Application of the Phase Rule to para-equilibrium phase diagrams is discussed. • A general algorithm to calculate para-equilibrium phase diagrams is described. - Abstract: If an initially homogeneous system at high temperature is rapidly cooled, a temporary para-equilibrium state may result in which rapidly diffusing elements have reached equilibrium but more slowly diffusing elements have remained essentially immobile. The best known example occurs when homogeneous austenite is quenched. A para-equilibrium phase assemblage may be calculated thermodynamically by Gibbs free energy minimization under the constraint that the ratios of the slowly diffusing elements are the same in all phases. Several examples of calculated para-equilibrium phase diagram sections are presented and the application of the Phase Rule is discussed. Although the rules governing the geometry of these diagrams may appear at first to be somewhat different from those for full equilibrium phase diagrams, it is shown that in fact they obey exactly the same rules with the following provision. Since the molar ratios of non-diffusing elements are the same in all phases at para-equilibrium, these ratios act, as far as the geometry of the diagram is concerned, like “potential” variables (such as T, pressure or chemical potentials) rather than like “normal” composition variables which need not be the same in all phases. A general algorithm to calculate para-equilibrium phase diagrams is presented. In the limit, if a para-equilibrium calculation is performed under the constraint that no elements diffuse, then the resultant phase diagram shows the single phase with the minimum Gibbs free energy at any point on the diagram; such calculations are of interest in physical vapor deposition when deposition is so rapid that phase

  8. Marcadores para la Realidad Aumentada para fines educativos

    María Reina Zarate Nava

    2013-12-01

    Full Text Available La Realidad Aumentada (AR es considerada por algunos expertos como la tecnología en crecimiento para el 2014, en diferentes sectores: ingeniería, educación, juegos y negocios, siendo este último el más usado en él 2013. Sin embargo en el sector educativo la AR se presenta en algunos proyectos que se han desarrollado para diferentes áreas de las ciencias, como Química, Física y Matemáticas, lo anterior con el objetivo de facilitar el proceso de Enseñanza-Aprendizaje. En el presente artículo se presenta el modelo de patrones utilizado para un Proyecto AR enfocado en Química, el cual presenta un conjunto de patrones que fueron valorados para facilitar el rastreo de los objetos y a su vez el entendimiento de algunos materiales de los laboratorios de Química I.

  9. Predicción de radiación solar a corto y medio plazo

    Zamarbide Ducun, Iosu

    2014-01-01

    La demanda global para una mayor integración de las energías renovables en el sistema eléctrico tanto a nivel local como mundial remarca la importancia de las cuestiones económicas y tecnológicas asociadas a los niveles crecientes de potencia fotovoltaica (PV) y de potencia solar concentrada (CSP) para conseguir hacer viable su conexión a red. Estas preocupaciones surgen de la naturaleza variable del recurso solar, desviaciones estacionales en la producción, el alto coste del almacenamiento d...

  10. Instalación eléctrica de un polideportivo por medio de placas solares

    FRASQUET PARETS, IVÁN

    2015-01-01

    El presente proyecto tiene como objetivo el estudio de las alternativas para realizar una instalación eléctrica mediante energía solar fotovoltaica, en más concretamente aislado de la red, en el polideportivo municipal de Palma de Gandía (Valencia). Tras analizar las ventajas y desventajas de las alternativas planteadas, se ha optado por realizar una instalación solar fotovoltaica aislada de red sobre varias cubiertas existentes en la instalación. Se ha realizado el dimensionado para la insta...

  11. Use of an artisan Solar Grain Dryer to dry soybeans and black beans grains

    Yanoy Morejón Mesa; Gemma Domínguez Calvo; Yoel Rodríguez Gago; Javier A. León Martínez

    2014-01-01

    El proceso de secado de granos es una actividad principal en las operaciones de poscosecha, con el objetivo de economizar en fuentes de energía y reducir la contaminación del medio ambiente es posible desarrollar secadoras solares de granos. Por esta razón se fabri- có y evaluó un prototipo para el secado solar de granos. Los principales resultados obtenidos para granos de soya y frijol negro fueron los siguientes: el contenido medio de humedad antes del secado de la soya fue 15% y después de...

  12. Modelação de coletores solares térmicos

    Lourenço, Pedro Miguel da Silva

    2012-01-01

    Tese de mestrado integrado em Engenharia da Energia e do Ambiente, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2012 Os ensaios de rendimento de coletores solares térmicos são de extrema importância pois permitem que determinado coletor seja certificado e possa assim contribuir para uma indústria mais credibilizada no mercado, para além de que sem esse conhecimento não é possível dimensionar sistemas solares térmicos. Foi por isto que surgiram as normas de ensaio...

  13. Plataforma VMware para academia virtual

    Martínez Sánchez, José María

    2014-01-01

    Este PFC surge para dar respuesta a los problemas que se presentan en una unidad educativa a la hora de diseñar y crear una nueva infraestructura de red, servidores y equipos de trabajo que se presenta en el diseño y puesta en marcha de una nueva entidad educativa. Se proyecta la creación y configuración de una infraestructura virtual que aborde todos estos problemas, ofreciendo la solución mediante un único nodo virtual. Para ello, utilizamos sw de VMware para la creación de dicho nodo virtu...

  14. Magnetohydrodynamic process in solar activity

    Jingxiu Wang; Jie Jiang

    2014-01-01

    Magnetohydrodynamics is one of the major disciplines in solar physics. Vigorous magnetohydrodynamic process is taking place in the solar convection zone and atmosphere. It controls the generating and structuring of the solar magnetic fields, causes the accumulation of magnetic non-potential energy in the solar atmosphere and triggers the explosive magnetic energy release, manifested as violent solar flares and coronal mass ejections. Nowadays detailed observations in solar astrophysics from s...

  15. Research on Flat Solar Collector

    Kavolynas, Antanas

    2005-01-01

    The Thesis analyzes one of the spheres of alternative energy supply – the solar energy. The main objective of the Thesis is to determine the energy rates of the solar collector and its accumulative capacity. The Paper introduces a stand on the solar collector research which consists of a flat solar collector, heat accumulator and auxiliary equipment. The research object of the Thesis is a laboratory flat solar collector and its system. The Thesis analyses the constructions of the solar collec...

  16. Long term vision on the use of the renewable energies in Mexico: Solar energy. First Part: Evaluation of the Solar Resource in Mexico (Annexe 6-I in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Vision a largo plazo sobre la utilizacion de las energias renovables en Mexico: Energia solar. Primera Parte: Evaluacion del Recurso Solar en Mexico (Anexo 6-I en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Estrada Gasca, Claudio A; Arancibia Bulnes, Camilo A; Dorantes Rodriguez, Ruben; Islas Samperio, Jorge; Muhlia Velasquez, Agustin [Universidad Nacional Autonoma de Mexico (Mexico)

    2005-08-15

    The application of the solar energy requires an evaluation of the solar resource. It is understood by evaluation the determination of the amount of solar energy available to be used in an application; from the point of view of the present applications it is advisable to distinguish two: the direct solar radiation and the diffuse solar radiation, that conform what it is known as the global solar radiation, or hemispheric. All the solar collectors have capacity to use the direct radiation, their capacity to use diffuse radiation depends on the concentration factor of the radiation that characterizes them. Another distinction that can be done is the measurement of different parts from the spectrum. It is not simple to predict the value of the solar radiation in a site or given moment, this has implications in the design of solar facilities, which are constructed to operate during a large number of years. [Spanish] La aplicacion de la energia solar requiere una evaluacion del recurso solar. Se entiende por evaluacion a la determinacion de la cantidad de energia solar disponible para ser utilizada en una aplicacion; desde el punto de vista de las aplicaciones actuales conviene distinguir dos: la radiacion solar directa y la radiacion solar difusa, que conforman lo que se conoce como la radiacion solar global, o hemisferica. Todos los colectores solares tienen capacidad de utilizar la radiacion directa, su capacidad de usar radiacion difusa depende del factor de concentracion de la radiacion que los caracteriza. Otra distincion que se puede hacer es la medicion de diferentes partes del espectro. No es sencillo predecir el valor de la radiacion solar en un sitio o momento dado, esto tiene implicaciones en el diseno de instalaciones solares, las cuales se construyen para operar durante un numero grande de anos.

  17. Comparative study of series of solar radiation; Estudio comparativo de series de radiacion solar

    Adaro, Agustin; Cesari, Daniela; Lema, Alba; Galimberti, Pablo; Barral, Jorge [Universidad Nacional de Rio Cuarto, (Argentina)

    2000-07-01

    la energia solar se debera contar con la mas adecuada informacion sobre los niveles de radiacion. Siendo esta fuente de energia dependiente de las fluctuaciones atmosfericas y meteorologicas, es que se requiere contar con la mas certera informacion respecto a la cantidad y variabilidad de la energia solar disponible. Un camino es el tratamiento estadistico de los datos ya disponibles, tanto de radiacion solar como de horas de sol. Este enfoque genera mucha expectativa por la mayor cantidad de informacion respecto a las horas de sol existente. Esta mayor informacion de horas de sol se debe a que las mediciones se realizan con instrumentos llamados heliografos con un nivel de complejidad y costo mucho menor que los instrumentos de medicion de radiacion. Entre los heliografos el mas utilizado es el de Campbell - Stokes, y es el que se a instalado en la mayoria de las estaciones meteorologicas de Argentina y el Mundo, por lo que la informacion de horas de sol es la que mas abunda. El presente trabajo tiene por objetivo encontrar una interrelacion entre las series medidas de horas de sol e irradiacion. El estudio se realiza utilizando modelos de series temporales y el modelo de Angstrom-Page. Se realiza ademas un estudio de la generacion de secuencias de radiacion utilizando el concepto de las Cadenas de Markov. Se analizan las series para Rio cuarto determinandose la funcion de transferencia entre ambas series, y se obtienen los valores de radiacion solar global para localidades de la misma region. Se encuentran los coeficientes de la Ecuacion de Anstrom-Page para Rio Cuarto. Se encuentra los valores medios mensuales por estos dos metodos y se comparan resultados.

  18. Solar Power System Design for the Solar Probe+ Mission

    Landis, Geoffrey A.; Schmitz, Paul C.; Kinnison, James; Fraeman, Martin; Roufberg, Lew; Vernon, Steve; Wirzburger, Melissa

    2008-01-01

    Solar Probe+ is an ambitious mission proposed to the solar corona, designed to make a perihelion approach of 9 solar radii from the surface of the sun. The high temperature, high solar flux environment makes this mission a significant challenge for power system design. This paper summarizes the power system conceptual design for the solar probe mission. Power supplies considered included nuclear, solar thermoelectric generation, solar dynamic generation using Stirling engines, and solar photovoltaic generation. The solar probe mission ranges from a starting distance from the sun of 1 AU, to a minimum distance of about 9.5 solar radii, or 0.044 AU, from the center of the sun. During the mission, the solar intensity ranges from one to about 510 times AM0. This requires power systems that can operate over nearly three orders of magnitude of incident intensity.

  19. DOE facilities solar design handbook

    Hunn, Bruce D.; Balcomb, J. Douglas

    1978-01-01

    This handbook covers design of solar heating systems for commercial and laboratory buildings at Department of Energy Facilities. It includes discussions of solar energy fundamentals, solar heating and cooling technology, systems, and components, as well as a discussion of solar system economics. Quantitative analysis, with generalized design and sizing curves, is presented for solar heating so that collector and other system parameters can be cost-economically sized without a computer simulation. Solar system design considerations and guidelines, as well as guidelines for developing subsystem specifications, are presented. Thus this handbook is both a primer for the solar novice and a reference manual for the solar system designer.

  20. Foundational Solar Resource Research (Poster)

    Orwig, K.; Wilcox, S.; Sengupta, M.; Habte, A.; Anderberg, M.; Stoffel, T.

    2012-07-01

    SunShot Initiative awardee posters describing the different technologies within the four subprograms of the DOE Solar Program (Photovoltaics, Concentrating Solar Power, Soft Costs, and Systems Integration).

  1. Solar Radiation Research Laboratory (Poster)

    Stoffel, T.; Andreas, A.; Reda, I.; Dooraghi, M.; Habte, A.; Kutchenreiter, M.; Wilcox, S.

    2012-07-01

    SunShot Initiative awardee posters describing the different technologies within the four subprograms of the DOE Solar Program (Photovoltaics, Concentrating Solar Power, Soft Costs, and Systems Integration).

  2. Solar thermal power plants

    The solar thermal power plant technology, the opportunities it presents and the developments in the market are outlined. The focus is on the technology of parabolic trough power plants, a proven technology for solar power generation on a large scale. In a parabolic trough power plant, trough-shaped mirrors concentrate the solar irradiation onto a pipe in the focal line of the collector. The thermal energy thus generated is used for electricity generation in a steam turbine. Parabolic trough plants can be combined with thermal storage and fossil or biomass fired heat exchangers to generate electricity even when the sun is not shining. Solar Millennium AG in Erlangen has developed the first power plant of this kind in Europe. After two years of construction the plant started operation in Southern Spain in 2008. This one and its sister projects are important steps leading the way for the whole market. The paper also covers the technological challenges, the key components used and the research and development activities concerning this technology. Solar thermal power plants are ideal for covering peak and medium loads in power grids. In hybrid operation they can also cover base-load. The Solar Chimney power plant, another striking technology for the conversion of solar into electric energy, is described briefly. The paper concludes with a look at the future - the import of solar energy from the deserts of North Africa to central Europe. (author)

  3. Solar Irradiance Variability

    Solanki, Sami K

    2012-01-01

    The Sun has long been considered a constant star, to the extent that its total irradiance was termed the solar constant. It required radiometers in space to detect the small variations in solar irradiance on timescales of the solar rotation and the solar cycle. A part of the difficulty is that there are no other constant natural daytime sources to which the Sun's brightness can be compared. The discovery of solar irradiance variability rekindled a long-running discussion on how strongly the Sun affects our climate. A non-negligible influence is suggested by correlation studies between solar variability and climate indicators. The mechanism for solar irradiance variations that fits the observations best is that magnetic features at the solar surface, i.e. sunspots, faculae and the magnetic network, are responsible for almost all variations (although on short timescales convection and p-mode oscillations also contribute). In spite of significant progress important questions are still open. Thus there is a debat...

  4. Insights on Solar Twins

    Sousa Duarte, Tharcisyo Sa e.; Soares da Costa, Jefferson; Dias do Nascimento Júnior, José

    2015-08-01

    The question about how to define a real solar twin are still active. Cayrel de Strobe et al. (1981) defined a solar twin like a star having at the same time the physical parameters, Teff, gravity, bolometric magnitude, microturbulent velocity, and chemical composition. We presented the more extensive sample of solar twins known to date. From these targets we will study the behavior of the solar twins as a function of fundamentals stellar parameters, effective temperature, luminosity, age, convective envelope mass deepening (1 - M*/M⊙), lithium abundance and rotation period. We selected the solar twins from observations with the spectropolarimeters ESPaDOnS at CFHT and the Narval at TBL and also on literature. All objects have high resolution and high signal to noise. Analyze this sample of solar twins will help us to understand how these stars whether located around of the Sun's place. Our preliminary results show that the lithium abundance presents one clear correlation with stellar age. The (1 - M*/M⊙) values obtained through our method provided good agreement with the solar value. The rotation periods allow us to assess the solar twins as a function of gyrochronology.

  5. Solar Electricity for Homes

    Roman, Harry T.

    2012-01-01

    Every day, the sun showers the Earth with millions of times more energy than its people use. The only problem is that energy is spread out over the entire Earth's surface and must be harvested. Engineers are learning to capture and use some of this energy to make electricity for homes. Solar panels make up the heart of a solar system. They can be…

  6. Energetic solar particles

    In this review, some of the important aspects of energetic solar particles and their relation to solar physics are discussed. The major aspects of solar cosmic ray studies currently under investigation are identified and attention is focussed on the problems of the physical processes in the sun which may be responsible for these phenomena. The studies of the composition and energy spectra of solar cosmic ray nuclei are related to the basic problem of particle acceleration process in sun and to the composition of elements in solar atmosphere. The composition of higher energy (>20 MeV/amu) multiply charged nuclei of He, C, N, O, Ne, Mg, Si and Fe give information on the abundance of elements in the solar atmosphere. At lower energies (approximately 1-10 MeV/amu), the abundances of these elements show enhancements relative to solar abundances and these enhancements are believed to be due to particle acceleration mechanisms operative in the sun which are not fully understood at present. Studies of the relative abundances of H2, H3 and He3 isotopes and Li, Be, B nuclei in the solar cosmic rays can also be studied. The question of the relationship of the accelerated particles in the sun to the optical flare phenomena is discussed. Further studies of different aspects of these phenomena may give important clues to a wide ranging phenomena in the active sun. The observational methods employed for these studies are mentioned. (A.K.)

  7. Leaves: Nature's Solar Collectors

    Isabelle, Aaron D.; de Groot, Cornelis

    2009-01-01

    One of the most captivating things about plants is the way they capture the Sun's energy, but this can be a difficult topic to cover with elementary students. Therefore, to help students to make a concrete connection to this abstract concept, this series of solar-energy lessons focuses on leaves and how they act as "solar collectors." As students…

  8. Sunmotor Solar Shack 120

    This article described a solar pump that was developed by Alberta-based Sunmotor International Ltd. The prototype Solar Shack 120 was recently deployed in central Alberta for a remediation project for Devon Canada. The portable solar pump unit is well suited for environmental remediation in the oilpatch where conventional electricity is not available. The solar panels automatically run the pump whenever there is enough sunlight and there is liquid in the sump. Devon Canada wanted a system that continues to pump during cloudy weather to avoid the accumulation of effluent in the sump. The Solar Shack 120 delivers 120 volts of alternating current (vac) power. Solar panels are used to charge a bank of large sealed batteries that supply direct power (DC) to an inverter, which converts it into AC. A thermostat control was added to shut off the pumps in cold weather to avoid battery discharging. The Solar Shack unit has possibilities in countries with unreliable electricity supplies. It could provide a backup power supply that automatically kicks in whenever the power grid goes down. Sunmotor International Ltd. can supply complete remote power systems for both AC and DC electrical requirements. The systems are designed for each application to ensure customer satisfaction. The company is currently building a unit that integrates solar power with a generator backup, thereby eliminating the annoying noise of a continually running generator. 1 fig

  9. Residential Solar Systems.

    Fulkerson, Dan

    This publication contains student and teacher instructional materials for a course in residential solar systems. The text is designed either as a basic solar course or as a supplement to extend student skills in areas such as architectural drafting, air conditioning and refrigeration, and plumbing. The materials are presented in four units…

  10. Solar water heater

    Vroom, H.J.; Bolle, W.R.; Schneider, H.; Swerdling, B.

    1977-04-05

    A closed water/glycol solar heating system is described for preheating a fluid so as to reduce energy requirements in bringing said fluid up to a desired temperature and holding same, said system including a solar collector having a flexible dome.

  11. Integrated solar panel antennas

    Vaccaro, S.; P. TORRES; Mosig, J. R.; Shah, Arvind; Zürcher,, J.-F.; A. K. Skrivervik; Gardiol, F.; de Maagt, P.; Gerlach, L.

    2008-01-01

    A new antenna which combines solar cells and printed patches is presented. The antenna is designed so as to accommodate the solar cells that provide power to an MMIC amplifier. A 2×4 array is presented, which operates at the frequency of 3.76 GHz and has a bandwidth of 16% and gain up to 30 dBi (active).

  12. Solar neutrino oscillations

    The special properties of solar neutrinos that render this flux so uniquely important in searches for neutrino masses and flavor mixing are reviewed. The effects of matter, including density fluctuations and turbulence, on solar neutrino oscillations are explained through analogies with more familiar atomic physics phenomena

  13. Solar Energy: Heat Transfer.

    Knapp, Henry H., III

    This module on heat transfer is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy technologies. The…

  14. Solar Energy: Home Heating.

    Knapp, Henry H., III

    This module on home heating is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy technologies. The module…

  15. Solar Energy: Heat Storage.

    Knapp, Henry H., III

    This module on heat storage is one of six in a series intended for use as supplements to currently available materials on solar energy and energy conservation. Together with the recommended texts and references (sources are identified), these modules provide an effective introduction to energy conservation and solar energy technologies. The module…

  16. Pioneering with Solar Power.

    Pollack, George; Pollack, Mary

    1982-01-01

    Describes the development of Mississippi County Community College's (MCCC's) solar energy system. Explains the functioning of the campus's computer-controlled photovoltaic concentrator system, MCCC's cooperative agreement with the Arkansas-Missouri Power Company, program funding, the integration of the solar system with other building components,…

  17. The thermodynamic solar energy

    The thermodynamic solar energy is the technic in the whole aiming to transform the solar radiation energy in high temperature heat and then in mechanical energy by a thermodynamic cycle. These technic are most often at an experimental scale. This paper describes and analyzes the research programs developed in the advanced countries, since 1980. (A.L.B.)

  18. Solar Energy Systems

    1981-01-01

    A waste water treatment plant in Wilton, Maine, where sludge is converted to methane gas, and Monsanto Company's Environmental Health Laboratory in St. Louis Missouri, where more than 200 solar collectors provide preheating of boiler feed water for laboratory use are representative of Grumman's Sunstream line of solar energy equipment. This equipment was developed with technology from NASA's Apollo lunar module program.

  19. Million Solar Roofs

    None

    2003-11-01

    Since its announcement in June 1997, the Million Solar Roofs Initiative has generated a major buzz in communities, states, and throughout the nation. With more than 300,000 installations, the buzz is getting louder. This brochure describes Million Solar Roofs activities and partnerships.

  20. Solar absorption cooling

    Kim, D.-S.

    2007-01-01

    As the world concerns more and more on global climate changes and depleting energy resources, solar cooling technology receives increasing interests from the public as an environment-friendly and sustainable alternative. However, making a competitive solar cooling machine for the market still remain

  1. Solar Forcing of Climate

    de Jager, C.

    2012-01-01

    Solar activity is evident both in the equatorial activity centres and in the polar magnetic field variations. The total solar irradiance variation is due to the former component. During the extraordinarily long minimum of activity between sunspot cycles 23 and 24, the variations related to the equat

  2. Solar thermal and concentrated solar power barometer

    After 2 years of sharp decline, the European solar thermal market is bottoming out. The EurObservev'ER survey findings are that the installation figure fell just 1.9% in comparison with 2010, giving a newly-installed collector area of 3.7 million m2. The concentrated solar power sector has been forging ahead alongside the heat production applications, and at the end of 2011 installed capacity passed the one gigawatt mark in Spain for the first time with 1157.2 MWe. (author)

  3. The Solar Bank concept

    The Solar Bank is proposed to be established as a multinational wholesale lending institution supporting the adoption of solar photovoltaic (PV) systems by as much as 40% of the world's population. It would supply capital resources to local lending institutions such as banks, credit unions, cooperatives, and rural lending organizations in the developing countries, and to financial institutions in the developed countries. The Solar Bank is intended to be global in scope, with operations in the major countries. The Solar Bank will bring a degree of standardization to the process of making small loans to many people for the purchase of PV systems, and it will provide technical support and training to its participating financial institutions. 'Solar Bank International' is likely to be headquartered in Europe. (orig.)

  4. Solar district heating

    The model presented here analyzes solar district heating systems on the basis of the power supplied at the grid feeding point. Consumption patterns are taken into account only in the form of different preset load curves. Processes are selected in consideration of the following aspects: (1) The design of a solar district heating system (collector surface, storage volume) depends on the expected contribution of solar power to electricity supply. For each of the key years 1989, 2005 and 2020, a low, average and high contribution were investigated, from which design concepts for other supply rates can be derived. (2) Yields and economic efficiency of solar systems also depend on collector sites and consumption patterns. 10 variants each with low and very high contributions of solar power were calculated for the key year 2020. (orig.)

  5. Risks of solar electricity

    Pop-Jordanov, J. [Macedonian Academy of Sciences and Arts, Skopje (Yugoslavia)

    1993-12-31

    The main objectives of the study were to provide scientific bases for the definition of the possible role of solar electricity in the future national energy program and in particular for the establishment of an experimental solar electrostation at MASA. The national long term interest in solar electricity is justified by the environmental impacts of coal, the lack of other domestic energy sources and the favourable climate conditions. For decision-making purposes, a comparative risk analysis including some specific solar electricity characteristics was undertaken. Detailed methodological investigations have shown that the standard approach does not fully appreciate the energy cycle boundaries nor the time dependence of the consequence and that it omits to include the psychosomatic and psychological indicators. The proper accounting of the above factors leads to comparatively more favorable results for the solar electricity option. (author) 4 figs., 20 refs.

  6. Solar wind travel time

    Russell, C. T.

    A useful rule of thumb in solar terrestrial studies is that the solar wind travels 4 Earth radii (RE) per minute. Long-term studies of solar wind velocity [e.g., Luhmann et al., 1993; 1994] show that the median velocity is about 420 km/s, corresponding to 3.96 RE min-1. The quartiles are about 370 km/s and 495 km/s, corresponding to 3.48 Re min-1 and 4.66 Re min-1 respectively. This number helps estimate the delays expected when observing a discontinuity at a solar wind monitor; one example is ISEE-3 when it was at the forward libration point (about 60 min). It is also helpful for estimating how much time passes before the dayside magnetosphere is compressed as denser solar wind flows by (about 2.5 min).

  7. A Little Solar Story

    Ahmad, Bashir

    1997-01-01

    Experiences from use of solar cookers in India and many other places are different. But the story which is based on a field study in Gujarat state of India shows that during last twenty years there has been a tendency that many families do not continue to use their solar cookers. The study shows...... that the tendency is related with the lack of compatibility of this new technology (solar cooker) with the everyday real-life conditions of the families. In principle the findings are supported by an evaluation report on a solar cooker project in Burkina Faso. The conclusion is that the user should be involved...... in the solar cooker technological development process....

  8. Solar combi systems

    Andersen, Elsa

    2007-01-01

    The focus in the present Ph.D. thesis is on the active use of solar energy for domestic hot water and space heating in so-called solar combi systems. Most efforts have been put into detailed investigations on the design of solar combi systems and on devices used for building up thermal...... the thermal behaviour of different components, and the theoretical investigations are used to study the influence of the thermal behaviour on the yearly thermal performance of solar combi systems. The experimental investigations imply detailed temperature measurements and flow visualization with the Particle...... Image Velocimetry measurement method. The theoretical investigations are based on the transient simulation program TrnSys and Computational Fluid Dynamics. The Ph.D. thesis demonstrates the influence on the thermal performance of solar combi systems of a number of different parameters...

  9. Anestesia espinal para colecistectomia

    Nayibe Salamanca R

    2009-10-01

    Full Text Available Introducción: La anestesia espinal o subaracnoidea brinda al paciente calidad y múltiples ventajas. Sin embargo, en procedimientos quirúrgicos que comprometen al abdomen superior ha sido poco empleada, como en la colecistectomía. En estas cirugías, ya sean laparoscópicas o abiertas, se ha empleado de forma rutinaria la anestesia general. Objetivo: Describir la aplicación de anestesia espinal para la realización de colecistectomía abierta. Materiales y métodos: Es un estudio retrospectivo, serie de casos, que evaluó 32 pacientes ASA I y II a los que se les realizó colecistectomía abierta, bajo anestesia espinal, en el tiempo comprendido entre junio de 2002 y junio de 2004, en un Hospital Nivel II de la ciudad de Popayán, previo consentimiento aprobado por el Comité Científico del Hospital. Resultados: En 25 mujeres y 7 hombres, con edad media de 33,6 años, se observó que la frecuencia cardiaca y la presión arterial sistólica, diastólica y media disminuyeron durante los primeros 20 minutos; luego, sus valores se incrementaron hasta estabilizarse por debajo de los parámetros iniciales respectivos. El 34,3% de la población presentó eventos transoperatorios como hipotensión, bradicardia, náusea, vómito, dolor en hombro o dolor torácico. En dos de estos Caucapacientes fue necesario cambiar a anestesia general. En el postoperatorio, 21,7% de los pacientes presentaron efectos adversos: náusea, vómito y cefalea. El 90 % egresaron del hospital en las primeras 48 horas. No se reportó mortalidad intra o postoperatorio inmediata. Conclusiones: La anestesia espinal es una alternativa a tener en cuenta para procedimientos como la colecistectomía abierta.Introduction: Spinal anaesthesia offers patients quality as well as several advantages; however in surgical procedures which involve the upper abdomen it had been less employed in procedures such as cholecistectomy by laparoscopic technique or via opening the abdomen where the

  10. Una agenda para educadores

    Robert O. McClintock

    2007-01-01

    Full Text Available Las instituciones educativas constituyen los principales factores en la construcción social de un nuevo sistema educativo. Las escuelas y los educadores controlan y producen propiedad intelectual de una extraordinaria profundidad y amplitud. Los cambios producidos por las tecnologías digitales están consiguiendo que el acceso y la producción de conocimiento sea más accesible y universal. Lo que es, a la vez, un gran logro de apertura curricular, pero también un grave peligro de perder la perspectiva eminentemente “educativa” de la transmisión del conocimiento en la escuela. Los nuevos recursos permiten a los educadores romper el ciclo de reproducción en los logros educativos, acercarse al medio y a la familia y transformar la escuela. Los educadores y las escuelas deben asumir el reto de constituir comunidades de aprendizaje. Así como de atreverse a producir y difundir ese conocimiento con soporte digital. Lo contrario sería una terrible abdicación. El artículo traza un recorrido histórico sobre esta función de la escuela y su adaptación a los medios y recursos de cada época. Tras lo cual, aboga por asumir el desafío actual de las TICs, para renovar el vínculo progresista con la posteridad y construir un mejor futuro. Los nuevos recursos permiten a los educadores romper el ciclo de reproducción en los logros educativos, acercarse al medio y a la familia y transformar la escuela.

  11. Proyecto de red para ONG

    Ruiz López, David

    2013-01-01

    Proyecto de una red de comunicaciones para una ONG en la Comunidad de Madrid. Projecte d'una xarxa de comunicacions per a una ONG a la Comunidad de Madrid. Bachelor thesis for the Telecommunication Technologies program on Telematics.

  12. Desenvolvimento e avaliação de filme antimicrobiano aromatizado para aplicação em massa de pastel Development and evaluation of antimicrobial and flavored film for using on pastry dough

    Allan Robledo Fialho e Moraes

    2011-03-01

    Full Text Available A indústria de alimentos, buscando atender à crescente demanda dos consumidores, vem desenvolvendo embalagens ativas para proporcionar qualidade e segurança aos produtos acondicionados. Este trabalho objetivou desenvolver e avaliar a aplicação de filmes ativos aromatizados em contato com a massa de pastel. Os filmes foram preparados pelo método casting, adicionados de ácido sórbico e aroma de pizza e avaliados in vitro frente ao microrganismo Penicillium sp. Também foram estudadas suas propriedades mecânicas, migração de ácido sórbico, avaliação sensorial do produto e análise microbiológica in vivo. Os filmes ativos apresentaram atividade antimicrobiana tanto in vitro como no alimento. A caracterização mecânica mostrou que os filmes ativos aromatizados apresentaram valores de carga máxima na ruptura, inferiores ao filme controle e, durante a migração, a adição de aroma contribuiu para uma maior liberação do ácido sórbico. Além disso, as massas de pastel em contato com os filmes ativos aromatizados apresentaram melhores resultados sensoriais.The food industry, trying to meet growing consumer demand, is developing active packaging to provide quality and safety for packed food. This research aimed to develop and evaluate the implementation of active flavored films in contact with pastry dough. The active films were evaluated for in vitro antimicrobial activity against Penicillium sp. The mechanical properties of the films, the sorbic acid migration, sensory and in vivo microbiological analyses were also tested. The active films showed better results for in vitro and in vivo microbiological analyses when compared with the film with the sorbic acid incorporated directly on the pastry dough. The incorporation of sorbic acid and flavor affected the mechanical properties of the active films compared to the control film. The flavor addition provided a larger migration of sorbic acid from the film to the pastry dough

  13. Bioconstrucción y arquitectura bioclimática para la ejecución de vivienda unifamiliar

    LÓPEZ GARRIDO, DANIEL

    2016-01-01

    [ES] Este trabajo final de grado, estudia diferentes formas de construir una vivienda aplicando criterios de bioconstrucción y arquitectura bioclimática. Para ello se realizó la búsqueda de un solar cuya ubicación y características cumplieran los requisitos para la construcción de una vivienda de este tipo. Para el diseño de la vivienda se utilizan el mayor número de elementos naturales, reciclados o que sean altamente reutilizables y reciclables. Otro de los puntos que se ha estudiado en pro...

  14. Vías verdes, reutilización de ferrocarriles en desuso para movilidad sostenible, ocio y turismo

    Aycart Luengo, Carmen

    2001-10-01

    Full Text Available Greenways are autonomous infrastructures destined to the non-motorised traffic, which use linear infrastructures out of service: railway platforms decommissioned and canal or river towpaths. Their specific characteristics like FACILITY, COMFORT, SAFETY and the gentle inclines convert them into wonderful places for walking or riding bicycle, and into accessible spaces for people with limited mobility (children, elderly and disabled people. In Spain there are more than 8.000 km of abandoned railway lines, which are prepared for going through 1.800 km. On the Spanish Greenways Program, coordinated by the Spanish Railways Foundation (FFE and executed by the Ministry for the Environment, Renfe, feve, Regions, Provinces and City Councils, 38 Greenways have already been very well conditioned, adding 950 km of length and some 40 M Euro (6.500 M pta invested. In 1998 the European Greenways Association was born, presided until now by the FFE. At the international leve1 the greatest success has been to receive the United Nations Good Practices Habitat 2000 International Award. The published Greenways Guide (two volumes, where are included 1.800 Greenways km, the web site www.viasverdes.com and the continuous spreading in several media, are a essential part of the promotion labour that is developed by FFE.Las Vías Verdes son infraestructuras autónomas destinadas al tráfico no motorizado, que utilizan infraestructuras lineales fuera de servicio, como las plataformas de ferrocarriles en desuso y los caminos de sirga de canales. Sus intrínsecas cualidades como la FACILIDAD, la COMODIDAD, la SEGURlDAD y la falta de pendientes, las convierten en maravillosos lugares para el paseo, tanto a pie como en bicicleta, y en espacios accesibles para personas con movilidad reducida (niños, ancianos, minusválidos. En España, tenemos más de 8.000 kilómetros de líneas ferroviarias abandonadas, de las cuales pueden ya recorrerse 1.800 km. Dentro del Programa V

  15. Planar Para Algebras, Reflection Positivity

    Jaffe, Arthur

    2016-01-01

    We define the notion of a planar para algebra, which arises naturally from combining planar algebras with the idea of $\\Z_{N}$ para symmetry in physics. A subfactor planar para algebra is a Hilbert space representation of planar tangles with parafermionic defects, that are invariant under isotopy. For each $\\Z_{N}$, we construct a family of subfactor planar para algebras which play the role of Temperley-Lieb-Jones planar algebras. The first example in this family is the parafermion planar para algebra. Based on this example, we introduce parafermion Pauli matrices, quaternion relations, and braided relations for parafermion algebras which one can use in the study of quantum information. Two different reflections play an important role in the theory of planar para algebras. One is the adjoint operator; the other is the modular conjugation in Tomita-Takesaki theory. We use the latter one to define the double algebra and to introduce reflection positivity. We give a new and geometric proof of reflection positivi...

  16. Las celdas solares como alternativa pedagógica en la enseñanza de la electricidad

    Aguirre Soler, John

    2013-01-01

    En este trabajo se usan las celdas solares para enseñar a los estudiantes de educación media vocacional la importancia del uso de energías renovables y no contaminantes para generar electricidad, y para enseñar los conceptos básicos de electricidad. Para lograr estos objetivos se diseñó y desarrolló un programa de actividades pedagógicas donde se usaron diferentes metodologías y técnicas de enseñanza-aprendizaje. Con el fin de que el aprendizaje de los estudiantes fuese motivan...

  17. Analysis and adaptation of a mathematical model for the prediction of solar radiation; Analisis y adaptacion de un modelo matematico de prediccion de radiacion solar

    Zambrano, Lorenzo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1986-12-31

    There is an abundant, reliable, free, source of energy whose use can be planned and besides, practicably inexhaustible: the solar energy. In Mexico it constitutes an important resource, because of its geographical position; for this reason it is fundamental to know it well, either by means of measurements conducted for several years or by mathematical models. These last ones predict with meteorological variables, the values of the solar radiation with acceptable precision. At the Instituto de Investigaciones Electricas (IIE) a model is studied for the prediction of the solar radiation to be adapted to the local conditions of Mexico. It is used in simulation studies of the solar plants functioning and other solar systems. [Espanol] Existe una fuente de energia abundante, confiable, gratuita, cuyo uso puede planearse y, ademas, es practicamente inagotable: la solar. En Mexico constituye un recurso importante, por la posicion geografica del pais; por eso es fundamental conocerlo bien, ya mediante mediciones realizadas durante algunos anos, ya mediante modelos matematicos. Estos ultimos predicen, con datos de variables meteorologicas, los valores de la radiacion solar con precision aceptable. En el Instituto de Investigaciones Electricas (IIE) se estudia un modelo de prediccion de radiacion solar para adaptarlo a las condiciones locales de Mexico. Se usa en estudios de simulacion del funcionamiento de plantas helioelectricas y otros sistemas solares.

  18. Desenvolvimento das técnicas experimentais de medição da fotocondutividade, de espectroscopia de deflexão fototérmica (PDS) e de caracterização de células solares para o estudo de filmes finos semicondutores em aplicações fotovoltaicas

    Ribeiro, Miguel Bruno Vieira

    2009-01-01

    Neste trabalho foram desenvolvidas várias técnicas de caracterização de filmes finos fotossensíveis e de células solares: fotocondutividade e espectroscopia de deflexão fototérmicos (PDS) em filmes finos, medição de curvas I(V) e VIM (variable ilumination method-medição de curvas I(V) de células solares com diferentes intensidades de iluminação). Estas técnicas permitem em conjunto estudar o mecanismo de transporte de carga sob iluminação nos filmes finos semicondutores, estabe...

  19. Solar and Hydrogen

    It has been widely accepted that the only sustainable and environmentally friendly energy is the solar energy and hydrogen energy, which can meet the increasing energy demand in the future. Solar Energy may be used either for solar thermal or for solar electricity conversion. Solar thermal collectors represent a wide-spread type of system for the conversion of solar energy. Radiation, convection and conduction are strongly coupled energy transport mechanisms in solar collector systems. The economic viability of lower temperature applications of solar energy may be improved by increasing the quantity of usable energy delivered per unit area of collector. This can be achieved by the use of selective black coatings which have a high degree of solar absorption, maintaining high energy input to the solar system while simultaneously suppressing the emission of thermal infrared radiation. Photovoltaic solar cells and modules are produced for: (1) large scale power generation, most commonly when modules are incorporated as part of a building (building integrated photovoltaic s) but also in centralised power stations, (2) supplying power to villages and towns in developing countries that are not connected to the supply grid, e.g. for lighting and water pumping systems, (3) supplying power in remote locations, e.g. for communications or weather monitoring equipment, (4) supplying power for satellites and space vehicles, (5) supplying power for consumer products, e.g. calculators, clocks, toys and night lights. In hydrogen energy systems, Proton exchange membrane (PEMFC) fuel cells are promising candidates for applications ranging from portable power sources (battery replacement applications) to power sources for future electric vehicles because of their safety, elimination of fuel processor system, thus, simple device fabrication and low cost. Although major steps forward have been achieved in terms of PEMFC design since the onset of research in this area, further

  20. Diseño de instalación eléctrica para acometida e instalación interior de una Planta de Valorización y Reciclaje de Baterías de Plomo-Acido con apoyo de instalación solar fotovoltaica conectada a red

    Céspedes Lasheras, José Juan

    2015-01-01

    El presente proyecto pretende describir y justificar las instalaciones eléctricas tanto de baja como de alta tensión, de una planta industrial dedicada a la Valorización y Reciclaje de Baterías de Plomo-Acido. Igualmente se describirá y justificará la instalación solar fotovoltaica conectada a red, instalada sobre parte de las cubiertas de los edificios que conforman la planta.

  1. Avaliação económica de um investimento em geração de energia das ondas e energia solar térmica

    Nunes, Ruben Fernando Lopes

    2012-01-01

    O presente trabalho tem como objectivo efectuar a avaliação económica e determinar a viabilidade com e sem os incentivos fiscais de duas tecnologias de conversão de duas fontes distinta e emergentes de energia renovável, o Concentrador Cilindro-parabólico e a Torre Solar para a energia solar termoeléctrica e a Coluna de Água Oscilante e o Pelamis para a energia das ondas. Realiza-se uma curta abordagem à energia Solar e à energia dos Oceanos, e às tecnologias existentes para estes tipos de en...

  2. Solar '80s: A Teacher's Handbook for Solar Energy Education.

    LaHart, David E.

    This guide is intended to assist the teacher in exploring energy issues and the technology of solar energy conversion and associated technologies. Sections of the guide include: (1) Rationale; (2) Technology Overview; (3) Sun Day Suggestions for School; (4) Backyard Solar Water Heater; (5) Solar Tea; (6) Biogas; (7) Solar Cells; (8) Economics; (9)…

  3. Performances of solar water pumping station with solar tracker

    For the solar water pumping stations ? solar tracking system with phototransistor is developed. On the basis of the experimental investigations the utility and efficiency of the PV water pumping station with solar tracker under different conditions of varying solar radiation in Armenia is shown

  4. Preliminary design package for solar collector and solar pump

    1978-01-01

    A solar-operated pump using an existing solar collector, for use on solar heating and cooling and hot water systems is described. Preliminary design criteria of the collector and solar-powered pump is given including: design drawings, verification plans, and hazard analysis.

  5. Solar thermal and concentrated solar power barometer

    As could be expected, the recession cast long shadows over the European solar thermal market throughout 2010. For the second year running, new installations for hot water production and space heating (collectors) decreased. According to the EurObserv'ER survey the newly-assigned surface area was 3.8 million m2 in 2010, down from 4.2 million m2 in 2009 and 4.6 million m2 in 2008. At the same time, the European High-temperature solar sector related to electricity production has been taking shape alongside the heat-producing solar sector related to electricity production has been taking shape alongside the heat-producing applications, with 638.4 MW already installed. Spain accounts for almost all of this capacity, and a further 5 European Union countries, mostly Mediterranean, intend to develop the sector. The EU'solar thermal base to date at the end of 2010 is 25.135,6 MWth. (author)

  6. Solar thermal and concentrated solar power barometer

    The European concentrated solar power plant market is steeling itself for tough time ahead. The number of projects under construction is a pittance compared with 2012 that was an excellent year for installations (an additional 802.5 MW of capacity recorded). This drop is the result of the moratorium on renewable energy power plants introduced by the Spanish government. The European solar thermal market is hardly any more encouraging . EurObserv'ER holds that it slipped for the fourth year in a row (it dropped 5.5% between 2011 and 2012). The newly-installed solar thermal collector surface area in the EU now stands at 3.4 million m2, far short of its 2008 installation record of 4.6 million m2. The EU's solar thermal base to date at the end of 2012 is 29.6 GWth with 2.4 GWth installed during the year 2012. This article gives tables gathering the figures of the production for every European country for 2012 and describes the market and the general trend for every EU member

  7. Total Solar Irradiance Variability and the Solar Activity Cycle

    Raychaudhuri, Probhas

    2006-01-01

    It is suggested that the solar variability is due to the perturbed nature of the solar core and this variability is provided by the variability of the solar neutrino flux from the solar neutrino detectors i.e., Homestake, Superkamiokande, SAGE and GALLEX-GNO. The solar neutrino flux in the standard solar model (SSM) was calculated on the assumption of L_nu (neutrino luminosity) = L_gamma (optical luminosity) which implies that if there is a change in optical luminosity then solar neutrino flu...

  8. Solar Cycle Prediction

    Petrovay, K

    2010-01-01

    A review of solar cycle prediction methods and their performance is given, including forecasts for cycle 24 and focusing on aspects of the solar cycle prediction problem that have a bearing on dynamo theory. The scope of the review is further restricted to the issue of predicting the amplitude (and optionally the epoch) of an upcoming solar maximum no later than right after the start of the given cycle. Prediction methods form three main groups. Precursor methods rely on the value of some measure of solar activity or magnetism at a specified time to predict the amplitude of the following solar maximum. Their implicit assumption is that each numbered solar cycle is a consistent unit in itself, while solar activity seems to consist of a series of much less tightly intercorrelated individual cycles. Extrapolation methods, in contrast, are based on the premise that the physical process giving rise to the sunspot number record is statistically homogeneous, i.e., the mathematical regularities underlying its variati...

  9. CHOOSING SOLAR PHOTOVOLTAIC PLANT

    Vinnikov A. V.

    2015-04-01

    Full Text Available Promising is the direction and, above all, in matters of energy saving and energy efficiency of Autonomous systems of power supply, the use of renewable sources-newable energy as a major source of energy for consumers in remote areas. Here priority is given to solar energy. Since solar radiation can be change place not only in heat and electrical. The article contains three main structural schematics of electricity supply with solar power plants. The features of their work are disclosed, as well as an algorithm for calculating solar energy systems, the sequence of which is to define the required parameters, the daily energy consumption by consumers of electric power, the calculation capacity of the battery, the choice of the inverter and determining the area of solar batteries. The article reveals the conditions that affect the calculation of the PV system. It is shown that the greatest efficiency, including economic and reliability we have at combined (hybrid Autonomous system, which was carried out with both solar power and wind power and gas stations. The important matters of improving the reliability of solar systems are the introduction to the design of a new element of the base, and first and foremost, Autonomous inventors performed on a single-phase transformer with a rotating magnetic field

  10. Perspectivas de la energía solar fotovoltaica en la edificación

    González Brañas, Iván

    2015-01-01

    El presente proyecto tiene la finalidad de elaborar las perspectivas de futuro de la energía solar fotovoltaica, especialmente en España. Para ello se analiza en profundidad la tecnología fotovoltaica y su industria a nivel mundial para conocer en qué punto de desarrollo se encuentra. También se detalla la evolución del mercado fotovoltaico a nivel mundial, realzando los factores más importantes que lo han hecho posible. Para ir aproximándose al mercado fotovoltaico en España, se estudia más ...

  11. Analysis of Flat-Plate Solar Array and Solar Lantern

    P. L. N. V. Aashrith; M. Sameera Sarma

    2014-01-01

    A very detailed theortical analysis of a solar array has been carried out based on established values of solar radiation data to predict the performance of solar lamp . The analysis is based on established theory about flat-plate collectors. Top heat loss coefficient (Ut), Bottom heat loss coefficient (Ub), Overall heat loss coefficient (Ul), Useful energy (Qu), efficiency (hp) of the flat-plate solar array and efficiency (hl) of the solar lantern has been calculated.

  12. Analysis of Flat-Plate Solar Array and Solar Lantern

    P. L. N. V. Aashrith

    2014-05-01

    Full Text Available A very detailed theortical analysis of a solar array has been carried out based on established values of solar radiation data to predict the performance of solar lamp . The analysis is based on established theory about flat-plate collectors. Top heat loss coefficient (Ut, Bottom heat loss coefficient (Ub, Overall heat loss coefficient (Ul, Useful energy (Qu, efficiency (hp of the flat-plate solar array and efficiency (hl of the solar lantern has been calculated.

  13. USO DE IMÁGENES SATELITALES DE ALTA RESOLUCIÓN PARA GENERAR CARTOGRAFÍA

    Patricio Zavala; Carlos Zavala

    2002-01-01

    Se presenta la metodología aplicada en la ciudad de Arica, Norte de Chile, para generar cartografía de altura de construcciones, mediante el análisis digital de una imagen satelital de alta resolución. Para ello, nos basamos en el cálculo de la longitud de las sombras que se derivan de distintas edificaciones, y del azimut solar de una imagen IRS 1C, que fue remuestreada mediante convolución cúbica a 5 metros. Este trabajo está basado fundamentalmente en los logros alcanzados en el desarrollo...

  14. Instalación para vivienda multifamiliar de ACS en Madrid

    Fernández Fanego, María

    2009-01-01

    El objeto de este proyecto consiste en el diseño y propuesta de una instalación solar térmica para producción de agua caliente sanitaria (ACS) en una vivienda multifamiliar situada en Madrid. Para ello se van a estudiar las necesidades térmicas de ACS en función de las características constructivas del edificio y analizando los datos climatológicos y de temperatura de red de agua fría propios del emplazamiento. Con ello se llevará a cabo un estudio energético teniendo en cue...

  15. Abonos verdes: Tecnología para el manejo agroecológico de los cultivos

    Prager Mósquera, Martín; Sanclemente Reyes, Oscar E.; Sánchez De Prager, Marina; Miller Gallego, José; Ángel Sánchez, Diego Iván

    2012-01-01

    Con miras a buscar alternativas de manejo para el mejoramiento de la fertilidad de los suelos cultivados por agricultores de bajos recursos, se ha hecho uso de tecnologías agroecológicas como los abonos verdes (AV), cuyos aportes investigativos a nivel mundial, buscan generar una base teórica que explique la importancia de su aplicación y potencialidades dentro del manejo de agroecosistemas. Su uso se fundamenta en el aprovechamiento de la energía solar para producir biomasa vegetal de alt...

  16. Physics of solar energy

    Chen, C Julian

    2011-01-01

    The definitive guide to the science of solar energy You hold in your hands the first, and only, truly comprehensive guide to the most abundant and most promising source of alternative energy-solar power. In recent years, all major countries in the world have been calling for an energy revolution. The renewable energy industry will drive a vigorous expansion of the global economy and create more ""green"" jobs. The use of fossil fuels to power our way of living is moving toward an inevitable end, with sources of coal, petroleum, and natural gas being fiercely depleted. Solar energy

  17. Exploring the solar system

    Bond, Peter

    2012-01-01

    The exploration of our solar system is one of humanity's greatest scientific achievements. The last fifty years in particular have seen huge steps forward in our understanding of the planets, the sun, and other objects in the solar system. Whilst planetary science is now a mature discipline - involving geoscientists, astronomers, physicists, and others - many profound mysteries remain, and there is indeed still the tantalizing possibility that we may find evidence of life on another planet in our system.Drawing upon the latest results from the second golden age of Solar System exploration, aut

  18. Solar Hidden Photon Search

    Schwarz, Matthias; Wiedemann, Guenter; Lindner, Axel; Redondo, Javier; Ringwald, Andreas; Wiedemann, Gunter

    2011-01-01

    The Solar Hidden Photon Search (SHIPS) is a joint astroparticle project of the Hamburger Sternwarte and DESY. The main target is to detect the solar emission of a new species of particles, so called Hidden Photons (HPs). Due to kinetic mixing, photons and HPs can convert into each other as they propagate. A small number of solar HPs - originating from photon to HP oscillations in the interior of the Sun - can be converted into photons in a long vacuum pipe pointing to the Sun - the SHIPS heli...

  19. Helioseismology with Solar Orbiter

    Löptien, Björn; Birch, Aaron C.; Gizon, Laurent; Schou, Jesper; Appourchaux, Thierry; Rodríguez, Julián Blanco; Cally, Paul S.; Dominguez-Tagle, Carlos; Gandorfer, Achim; Hill, Frank; Hirzberger, Johann; Scherrer, Philip H.; Solanki, Sami K.

    2014-01-01

    The Solar Orbiter mission, to be launched in July 2017, will carry a suite of remote sensing and in-situ instruments, including the Polarimetric and Helioseismic Imager (PHI). PHI will deliver high-cadence images of the Sun in intensity and Doppler velocity suitable for carrying out novel helioseismic studies. The orbit of the Solar Orbiter spacecraft will reach a solar latitude of up to 21 deg (up to 34 deg by the end of the extended mission) and thus will enable the first local helioseismol...

  20. Solar Hidden Photon Search

    Schwarz, Matthias; Redondo, Javier; Ringwald, Andreas; Wiedemann, Guenter

    2011-01-01

    The Solar Hidden Photon Search (SHIPS) is a joint astroparticle project of the Hamburger Sternwarte and DESY. The main target is to detect the solar emission of a new species of particles, so called Hidden Photons (HPs). Due to kinetic mixing, photons and HPs can convert into each other as they propagate. A small number of solar HPs - originating from photon to HP oscillations in the interior of the Sun - can be converted into photons in a long vacuum pipe pointing to the Sun - the SHIPS helioscope.