Analysis of a flat plate collector with fluid undergoing phase change

N. D. Kaushika, S. C. Bharadwaj and S. C. Kaushik

Applied Energy, 1982, vol. 11, issue 3, 233-242

Abstract: This paper presents a theoretical analysis of the performance of a flat plate solar collector with the heat removal fluid undergoing a phase change. The resultant efficiency expression is a modified Hottel-Whillier-Bliss equation. Numerical computations are made to investigate the effect of vaporisation and operational parameters on the collector's performance. The collector's efficiency increases with the increase in liquid length until a point is reached when the region of superheating the vapour disappears. The efficiency is higher when a heat removal fluid of high latent heat of vaporisation is used in the collector. An increase in the saturation temperature of the working fluid (with increase of pressure) in the collector reduces its efficiency.

Date: 1982
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