A fresnel strip reflector-concentrator for tubular solar-energy collectors

C. Choudhury and H.K. Sehgal

Applied Energy, 1986, vol. 23, issue 2, 143-154

Abstract: A linear Fresnel reflector-concentrator employing commercial flat, front-reflecting mirror strips (of reflectivity [varrho] = 0·6), arranged in a planar configuration, has been fabricated and analyzed. An average concentration ratio of about 18 has been obtained for two-thirds of the periphery of a tubular receiver of 0·025 m diameter. Working in conjunction with a partially evacuated (10-2 Torr) cylindrical collector employing a selective cobalt oxide coating (with [alpha] = 0·88, [epsilon]250°C = 0·25 and stable up to 600°C), a stagnation temperature of ~ 385°C has been obtained, corresponding to a direct solar flux of ~ 600 W/m2.

Date: 1986
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