The Thermal Performance of the Two-Pass, Two-Glass-Cover Solar Air Heater

[+] Author and Article Information
P. Persad, S. Satcunanathan

Department of Mechanical Engineering, University of the West Indies, St. Augustine, Trinidad

J. Sol. Energy Eng 105(3), 254-258 (Aug 01, 1983) (5 pages) doi:10.1115/1.3266375 History: Received June 01, 1982; Online November 11, 2009


Analytic models are developed for the performance prediction of a two-glass-cover solar air heater operated in both the single-pass and two-pass modes. It is shown that the two-pass mode of operation is superior to the single-pass mode of operation over the range of collector inlet temperatures considered. This is seen to be mainly due to the fact that, in the two-pass mode of operation, the outer glass cover is cooled by the working fluid, thereby reducing the top losses. It is also shown that the performance in the two-pass mode of operation is independent of length, over the range of collector lengths considered, and that a critical plate spacing, dependent on the temperature level of operation of the collector, is indicated. Predicted values of performance are in good agreement with experimental results.

Copyright © 1983 by ASME
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