Abstract
Electroplating selective copper oxide coatings were prepared on the surface of a rectangular absorber ( α = 0.92 and ε 100°C = 0.18) for operation in conjunction with a prototype linear solar Fresnel reflecting concentrating collector. Overall heat loss coefficients ( U L) of the selectively coated absorber at temperatures up to ∼300°C, optical efficiency ( η o) and stagnation temperature of the concentrator–absorber system were determined experimentally. The results have been compared with those obtained from an identical black painted absorber. Thermal efficiency ( η c) computed from the results of U L and η o measurements at a temperature of 250°C provides a value of 49% with the selectively coated absorber and 48% with the black painted absorber.
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