Abstract
Recent investigations of Fresnel lens concentrator optics have shown that optical efficiency and module performance depend on lens temperature. In former works we succeeded in modeling these effects at a computer and demonstrated a very good match to measurements for SoG Fresnel lenses. In the work presented here, we combined these tools with irradiation spectra and ambient temperature data at typical sites for concentrator photovoltaic power plants for a whole year of operation. We appended a model of a solar cell based on the detailed balance limit introduced by Shockley and Queisser. Thereby the temperature dependence of concentrator photovoltaic systems consisting of a triple junction solar cell and a Fresnel lens concentrator can be evaluated including changes in spectrum over daytime and during all seasons. In our analysis polymethylmethacrylate (PMMA) Fresnel lenses and silicone on glass (SoG) Fresnel lenses show comparable energy harvesting efficiency at close to market locations.
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