An Improved Technique for Computing the Top Heat Loss Factor of a Flat-Plate Collector With a Single Glazing

[+] Author and Article Information
S. C. Mullick, S. K. Samdarshi

Centre for Energy Studies, Indian Institute of Technology, Delhi, New Delhi 110 016, India

J. Sol. Energy Eng 110(4), 262-267 (Nov 01, 1988) (6 pages) doi:10.1115/1.3268266 History: Received September 01, 1987; Revised May 01, 1988; Online November 11, 2009


A different approach to evaluate the top heat loss factor of a flat plate solar collector with a single glass cover is proposed. The equation for the heat loss factor in the analytical form is employed instead of the semi-empirical form hitherto employed for solar collectors. The glass cover temperature is, however, estimated by an empirical relation. (This relation replaces the empirical relation for the factor f of the earlier work). Values of the top heat loss factor calculated by this simple technique are within 3 percent (maximum error) of those obtained by iterative solution of the heat balance equations. There is an improvement in accuracy by a factor greater than five over the current semi-empirical equations. The range of variables covered is 50° C to 150° C in absorber plate temperature, 0.1 to 0.95 in absorber coating emittance, and 5 W/m2 C to 45 W/m2 C in wind heat-transfer coefficient. The effect of variation in air properties with temperature has been taken into account.

Copyright © 1988 by ASME
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