Solar Collectors with Tubes Partially Filled with Porous Substrates

In this work, the thermal performance of a conventional collector is improved by inserting porous substrates at the inner walls of the collector tubes. The porous substrates improve the convective heat transfer coefficient between the tube wall and the fluid. This improvement is investigated numeric...

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Bibliographic Details
Published in:Journal of solar energy engineering 1999-02, Vol.121 (1), p.20-24
Main Authors: Alkam, M. K, Al-Nimr, M. A
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Exact sciences and technology
Natural energy
Solar collectors
Solar energy
Solar thermal conversion
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Summary:In this work, the thermal performance of a conventional collector is improved by inserting porous substrates at the inner walls of the collector tubes. The porous substrates improve the convective heat transfer coefficient between the tube wall and the fluid. This improvement is investigated numerically and its effects on the efficiency and the useful gain of the collector are evaluated. It is found that inserting the porous substrate may raise the collector efficiency considerably, especially at high values of the overall heat loss coefficient.
ISSN:0199-6231
1528-8986
DOI:10.1115/1.2888137