Abstract
A modified form of the Hottel-Whillier-Bliss solar collector efficiency function is investigated for unglazed solar collector characterisation. The modified function includes allowance for long-wave sky radiation and wind speed on collector performance. The effect of uncertainties in long-wave radiation and wind speed measurement on the evaluation of the collector efficiency is discussed. The use of four coefficient and three coefficient forms of the modified Hottel-Whillier-Bliss function are considered from the point of view of test data reliability.
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