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Proceedings Paper

Efficient Hybrid Photovoltaic-Photothermal Solar Conversion System With Cogeneration
Author(s): D. E. Soule; E. F. Rechel; D. W. Smith; F. A. Willis
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Paper Abstract

A new type of concentrating photovoltaic-photothermal solar conversion system with output cogeneration is presented. This technique, called total solar cogeneration (TSC), converts the total solar spectrum directly and cogenerates the output into three energy components: high-temperature heat (HT), photovoltaic electricity (PV), and low-temperature heat (LT). A specially designed heat-mirror with a beam-splitting technique is used to direct a selected portion of the solar spectrum to a HT evacuated-tube receiver. This high-grade heat transfer is optimized, while effectively maintaining the integrity of the photovoltaic conversion efficiency. High-current A.S.E.C. silicon solar cells (nominally 18.3% efficient at 28°C and 35x) are used. An analysis of heat-mirror transmittance profiles has led to an optimized theoretical parametric model profile, that in a TSC system is capable of delivering HT heat with 39% efficiency, while reducing PV efficiency by only 3.4%. In an experimental TSC concentrating module using a dielectric-Au-dielectric multilayer heat-mirror with optical losses, the projected output is HT heat (150°-250°C) at 17.8% efficiency, 12 V d.c. PV electricity at 9.5%, and LT heat (50°-70°C) at 41.9%, with a total cogenerated output efficiency of 69%.

Paper Details

Date Published: 2 December 1985
PDF: 10 pages
Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); doi: 10.1117/12.966302
Show Author Affiliations
D. E. Soule, Western Illinois University (United States)
E. F. Rechel, Western Illinois University (United States)
D. W. Smith, University of North Carolina (United States)
F. A. Willis, Western Illinois University (United States)

Published in SPIE Proceedings Vol. 0562:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV
Carl M. Lampert, Editor(s)

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