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Technical Briefs

Heat Transfer Analysis Through Solar and Rooted Fins

[+] Author and Article Information
A.-R. A. Khaled1

Thermal Engineering and Desalination Technology Department, King Abdul Aziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabiaakhaled@kau.edu.sa

1

Corresponding author.

J. Heat Transfer 130(7), 074503 (May 20, 2008) (4 pages) doi:10.1115/1.2897927 History: Received February 15, 2007; Revised June 28, 2007; Published May 20, 2008

Heat transfer through solar fins and rooted fins is analyzed theoretically in this work. The terminology of “solar fin” is used to refer to fins that are subject to external irradiations while the terminology “rooted fin” is used to refer to fins partially embedded in the base wall. One-dimensional heat transfer analysis is conducted and heat transfer rate through the fin, fin efficiency, as well as other performance indicators are obtained. It is found that the fin efficiency of the solar fins is maximized at certain fin indices and that rooted fins are preferable over ordinary fins for a wide range of fin indices. This range of fin indices is summarized in a correlation for insulated walls or insulated fin roots. Moreover, the minimum fin length that maximizes fin heat transfer is found to increase as solar irradiation intensity increases for solar fins subjected partially to solar irradiations. Finally, this work provides new passive methods for enhancing heat transfer in thermal systems.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

(a) Solar fin fully subject to solar irradiation. (b) Solar fin partially subject to solar irradiation. (c) Rooted fin.

Grahic Jump Location
Figure 2

Effects of mL and the solar irradiation parameter Rm on the fin efficiency η for the solar fin fully subject to solar irradiations for an insulated tip fin

Grahic Jump Location
Figure 3

Effects of mL1 and the temperature ratio on the performance indicator γ for a very long rooted fin

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