Multibandgap Cells in a Thermophotovoltaic System
The design of a thermophotovoltaic (TPV) converter which operates with conventional multilayer non absorbing filters as selective mirrors and conventional multi-bandgap cells is reported in this paper. The TPV consists of two facing radiators placed near the focus of two parabolic mirrors. Sunlight is focused on the two radiators and heats them. The spectral region of the radiation emitted by the radiators, corresponding to the maximum spectral response of the cells-reflected at selective mirrors — is focused onto multi band-gap cells. The I.R. radiation is exchanged between the two radiators to keep them at steady temperature. The calculations of the time — dependent energy balance of the converter predict efficiencies of ∼45%.
KeywordsRadiator Temperature Wavelength Band Conductive Heat Transfer Reflectance Band Fresnel Lens
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