Convective heat transfers within air spaces of compound parabolic concentrating solar-energy collectors

D.E. Prapas, B. Norton, P.E. Melidis and S.D. Probert

Applied Energy, 1987, vol. 28, issue 2, 123-135

Abstract: Steady-state temperature distributions within the enclosed air-space of a compound parabolic concentrating (CPC) solar-energy collector have been observed with an 18 cm field-of-view Mach-Zehnder interferometer. The dependences of the local and average convective heat-transfer coefficients on the concentration ratio of the collector, its inclination (i.e. the slope of the collector aperture with respect to the horizontal direction) and the absorber temperature are deduced. The average Nusselt number rises as the inclination of the collector increases, and this effect is enhanced the higher the concentration ratio. The ratio of the convective heat-transfer coefficient from the absorber (to the reflector) and that from the absorber (to the aperture cover) is between 0·50 and 0·70 for all the cases investigated. Generalised correlations for the variation of Nusselt number with the dimensions of a CPC collector have been obtained.

Date: 1987
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