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

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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.

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