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RESEARCH PAPERS

Natural Convection In Compound Parabolic Concentrators—A Finite-Element Solution

[+] Author and Article Information
S. I. Abdel-Khalik, H.-W. Li

Nuclear Engineering Department, University of Wisconsin, Madison, Wis.

K. R. Randall

Mechanical Engineering Department, University of Wisconsin, Madison, Wis.

J. Heat Transfer 100(2), 199-204 (May 01, 1978) (6 pages) doi:10.1115/1.3450781 History: Received November 21, 1977; Online August 11, 2010

Abstract

Natural convection heat transfer coefficients between absorber surfaces and cover plates for vertically oriented two-dimensional compound parabolic concentrators (CPC) are evaluated using finite-element techniques. Values of the critical Rayleigh number for different concentrations (2 < C < 10) with 1/3, 2/3, and full CPC heights are determined. Generalized charts for estimating the average absorber plate Nusselt number as a function of Rayleigh number and concentration for both full and truncated CPC cavities are given. The results are useful for evaluating the covective loss coefficients from such collectors.

Copyright © 1978 by ASME
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