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RESEARCH PAPERS

Natural Convection and Sidewall Losses in Trapezoidal Groove Collectors

[+] Author and Article Information
L. Iyican

Shell Development Co., Houston, TX 77001

L. C. Witte

Heat Transfer and Phase Change Laboratory, Department of Mech. Engineering, University of Houston, Houston, TX 77004

Y. Bayazitoglu

Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77001

J. Sol. Energy Eng 103(2), 167-172 (May 01, 1981) (6 pages) doi:10.1115/1.3266223 History: Received February 02, 1981; Online November 11, 2009

Abstract

Experimental data for heat transfer across air-filled inclined trapezoidal enclosures are reported for a Rayleigh number range of ∼2 × 103 to ∼5 × 107 . The large side was cooled to uniform temperature while the opposing small side was electrically heated. The enclosures were completed by two aluminum sidewalls which simulated the reflective surfaces in moderately-concentrating solar collectors. The experiments show that conductive heat losses up the sidewalls can be very large even when the sidewalls are thermally insulated from the top and bottom surfaces. However, the conductivity of the sidewalls has only a small effect on convective heat transfer across the groove. Natural convection heat transfer in the groove can be correlated reasonably well by an equation of the form Nu = C Ra0.345 .

Copyright © 1981 by ASME
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