Solar Collectors with Tubes Partially Filled with Porous Substrates
- 1 February 1999
- journal article
- Published by ASME International in Journal of Solar Energy Engineering
- Vol. 121 (1), 20-24
- https://doi.org/10.1115/1.2888137
Abstract
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.Keywords
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