An Experimental Study of Free Convection in Compound Parabolic Concentrator (CPC) Cavities

[+] Author and Article Information
T. C. Chew, N. E. Wijeysundera, A. O. Tay

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511

J. Sol. Energy Eng 110(4), 293-298 (Nov 01, 1988) (6 pages) doi:10.1115/1.3268270 History: Received November 15, 1987; Revised March 15, 1988; Online November 11, 2009


An experimental study of the free convection heat transfer between the cylindrical absorber and the flat top of a compound parabolic concentrator (CPC) is described. Results are obtained for a range of absorber temperatures and four CPC cavity heights. For similar conditions of operating temperature, the heat transfer from a cylinder in free air is about 30 to 50 percent higher than in a CPC cavity. Two correlations for Nusselt and Grashof numbers have been obtained using the equivalent length and the cavity height as the characteristic length of the system.

Copyright © 1988 by ASME
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