Forced Convective Heat Transfer in Cross-Corrugated Solar Air Heaters

[+] Author and Article Information
Y. Piao, E. G. Hauptmann, M. Iqbal

Department of Mechanical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada

J. Sol. Energy Eng 116(4), 212-214 (Nov 01, 1994) (3 pages) doi:10.1115/1.2930084 History: Received May 05, 1993; Revised November 24, 1993; Online June 06, 2008


Forced convective heat transfer in a cross-corrugated channel solar air heater has been studied experimentally using air as a working fluid. The channel was formed by two transversely positioned corrugated sheets and two flat thermally insulated side walls. One corrugated sheet was heated by a radiant heater, while the other was thermally insulated. The fluid velocity and temperature, and the wall temperature and the local heat flux across the heated corrugated sheet were measured for a variety of operating flow rates. Experimental results for the channel geometry have yielded the correlation Nu=0.0743(Re)0.76 . This heat-transfer coefficient is about 2.8 times that of a smooth flat channel. The experiments showed that local heat transfer rate was smaller on the valley of the corrugation than that on the peak. The ratio of the local heat transfer rates on the two locations was related to the Reynolds number.

Copyright © 1994 by The American Society of Mechanical Engineers
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