From Event: SPIE Optical Engineering + Applications, 2016
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.
C. Leiner, F. P. Wenzl, C. Sommer, and 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 (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2237866.
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