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RESEARCH PAPERS

Convective Losses From Cavity Solar Receivers—Comparisons Between Analytical Predictions and Experimental Results

[+] Author and Article Information
A. M. Clausing

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

J. Sol. Energy Eng 105(1), 29-33 (Feb 01, 1983) (5 pages) doi:10.1115/1.3266342 History: Received May 26, 1982; Online November 11, 2009

Abstract

Cavity solar receivers are generally believed to have higher thermal efficiencies than external receivers due to reduced losses. A simple analytical model was presented by the author which indicated that the ability to heat the air inside the cavity often controls the convective loss from cavity receivers. Thus, if the receiver contains a large amount of inactive hot wall area, it can experience a large convective loss. Excellent experimental data from a variety of cavity configurations and orientations have recently become available. These data provided a means of testing and refining the analytical model. In this manuscript, a brief description of the refined model is presented. Emphasis is placed on using available experimental evidence to substantiate the hypothesized mechanisms and assumptions. Detailed comparisons are given between analytical predictions and experimental results. Excellent agreement is obtained, and the important mechanisms are more clearly delineated.

Copyright © 1983 by ASME
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