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Abstract
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| Current availability of solar cells with efficiencies proven to be close to 40% offers a decisive opportunity to reduce the cost of photovoltaic energy. These cells, which are based on III-V semiconductors, are able to be operated at very high concentration (higher than 1000X) where they become cost effective. Therefore, an optical concentrator must be developed in order to achieve a global system with acceptable efficiency and cost. It must provide high concentration, wide acceptance angle, high efficiency and, if possible, a compact design which reduces the size and weight of the system. To get concentration exceeding 1000X a new system concept (FluidReflex) based on one-step reflexive optics has been designed. The reflexive surface is an aspheric mirror in which the high efficiency cell is placed at its focus. The volume delimited by the cell¿s plane and the reflexive surface is filled with a fluid dielectric with the underlying benefits. The heat flux generated at the cell is dissipated by natural or forced convection in the fluid avoiding the need of cooling elements, and consequently the shadows casted by them. In addition, the fluid acts as a refractive index adapter reducing Fresnel losses in the interfaces. Keywords: concentrators, reflexive, fluid dielectric | |
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International
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Si |
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Congress
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23rd European Photovoltaic Solar Energy Conference |
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960 |
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Place
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Valencia, España |
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Reviewers
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Si |
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ISBN/ISSN
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3-936338-24-8 |
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Start Date
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01/09/2008 |
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End Date
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05/09/2008 |
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From page
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132 |
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To page
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136 |
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Proceedings of the International Conference held in Valencia, Spain |