7 September 2016 Improving the effectiveness of photovoltaic devices by light guiding optical foils
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Abstract
A photovoltaic device comprising of areas which are partly covered by solar cells and a light guiding film is investigated. In particular results on the feasibility of combined daylighting and photovoltaic energy generation are presented. Optical simulations have been conducted for a device-design optimized to redirect most of perpendicular impinging light rays onto photovoltaic areas. Two application cases are investigated for integrating the photovoltaic device into windows and/or glazings in middle (northern) latitudes. The first application case deals with an overhead glazing and the second deals with a window integrated in a roof tilted by 30° towards south. For the latter case encouraging results have been derived. In particular it is calculated that during summer time more than 70% of the direct sunlight is absorbed by photovoltaic areas and less than 10% is transmitted. Consequently, effective shading in summer against direct sunlight can be achieved and most of the shaded solar irradiation can be used for photovoltaic energy conversion. In contrast, in winter time about 40% of the direct sunlight is transmitted through the device and enables decent daylighting.
Conference Presentation
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C. Leiner, C. Leiner, F. P. Wenzl, F. P. Wenzl, C. Sommer, C. Sommer, G. Peharz, G. Peharz, } "Improving the effectiveness of photovoltaic devices by light guiding optical foils", Proc. SPIE 9955, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIII—Commemorating the 50th Anniversary of Nonimaging Optics, 995508 (7 September 2016); doi: 10.1117/12.2237866; https://doi.org/10.1117/12.2237866
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