Unglazed Solar Collector Performance Characteristics

[+] Author and Article Information
G. L. Morrison, D. Gilliaert

Commission of the European Communities, Joint Research Centre, Ispra, Italy

J. Sol. Energy Eng 114(3), 194-200 (Aug 01, 1992) (7 pages) doi:10.1115/1.2930005 History: Received June 01, 1991; Revised December 01, 1991; Online June 06, 2008


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.

Copyright © 1992 by The American Society of Mechanical Engineers
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