Solar Collectors
Mostrando 25-34 de 34 artigos, teses e dissertações.
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25. Viability of use of PVC tubes in solar collectors: an analysis of materials
This paper presents a study of the inherent degradations of PVC tubes due to the thermal effect and ultraviolet solar radiation. The approach relates its causes and its effect of use of the PVC tubes as elements to absorption, forming a coil, in solar collectors for water heating. It is demonstrated that such degradations can be burst through the use of an o
Materials Research. Publicado em: 2003-06
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26. Análise termoeconômica de coletores solares planos
As fontes de energia convencionais, ainda a disposição para o consumo, por muitas vezes irracional, vem sofrendo indícios de esgotamento e paralelamente causando desequilibrio ecológicos, o que faz com que o custo unitário de sua utilização e as crises energéticas aumentem substancialmente, tornando cada vez mais oneroso o uso de tais fontes.
Publicado em: 2003
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27. Optimization of solar energy water heating systems in single-family residences using the TRNSYS program. / Otimização de sistema de aquecimento solar de água em edificações residenciais unifamiliares utilizando o programa TRNSYS.
Solar water heating systems have been widely used in Brazil for domestic purposes in single-family residences, taking advantage of the potential energy of the water of the superior reservoir and the phenomenon of the termosyphon for the circulation of the hot water. However these solar water heating systems are usually design through tables supplied by the m
Publicado em: 2003
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28. Estudo Comparativo de SuperfÃcies Seletivas para Coletores Solares / Comparative Study of Selective Surfaces for Solar Collectors
In practical applications of active and passive solar energy, or other construction purposes, the coating material which absorbs solar radiation has an important role as regards the absorption and emission of thermal radiation and, directly influencing the cost benefit the product. Surface coatings for solar radiation-absorbing plate or selective surfaces, c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2001
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29. Sintese otimizada de sistemas de aquecimento solar de agua
The optimal design of a solar water heater is regarded as achieved when the set of design variables is such that produces the minimum cost of the equipment during its life-cycle. For summing up this cost, it is necessary to take account of acquisition costs, maintenance costs and expenses with auxiliary energy. In this work, a computational procedure for fin
Publicado em: 2000
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30. INSERCAO DA ENERGIA SOLAR FOTOVOLTAICA NO BRASIL / Insertion of photovoltaic solar energy in Brazil
The energy generated by the sun, land of endless time scale, can be used as a source of heat (photothermal aspect) and as the light source. The photothermal solar energy can be used to heat fluids through flat collectors. Previous studies (04,05), developed in Brazil, indicate that the adoption of this solution for heating water would be very advantageous fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/1993
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31. Estudo do dimensionamento de coletor solar e secador
This research work reports the study of a system of a solar collector and a bin for grain drying. It was developed mathematical simulations to present the transient and steady state phenomena applied to two kinds of plane solar collectors. The first type of solar collector was covered with plastic sheet and the second kind had the absorbent plate directly ex
Publicado em: 1985
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32. Caracteristicas do poliester reforçado com fibra de vidro para aplicações em coletores solares termicos
The use of solar collectors, flat-plate or focusing, is growing fast. The use of plastic materials is becoming more popular, more particularly in the use of fiberglass reinforced polyester. How ever, little is known about the limitations of the material with respect to the outside exposure. The purpose of this work is to characterize fiberglass reinforced po
Publicado em: 1978
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33. SOLAR COLLECTORS, SELECTIVE SURFACES, AND HEAT ENGINES
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34. La roca magica: Uses of natural zeolites in agriculture and industry
For nearly 200 years since their discovery in 1756, geologists considered the zeolite minerals to occur as fairly large crystals in the vugs and cavities of basalts and other traprock formations. Here, they were prized by mineral collectors, but their small abundance and polymineralic nature defied commercial exploitation. As the synthetic zeolite (mole
The National Academy of Sciences.