Abstract
A linear Fresnel reflector-concentrator employing commercial flat, front-reflecting mirror strips (of reflectivity ϱ = 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 α = 0·88, ε 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/m 2.
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