期刊
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
卷 184, 期 -, 页码 -出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2022.107942
关键词
Parabolic trough collector; Heat transfer; Porous foam; Monte Carlo Ray Tracing; Surface-to-surface
This study investigates the application of porous medium for enhancing heat transfer in a parabolic trough solar system. Simulation results show that using porous inserts can rebuild the velocity field, eliminate hotspot formation, and decrease thermal resistance. The usage of porous medium leads to an increase in heat transfer and pressure drop, and can achieve better performance under certain conditions.
The application of porous medium for enhancing heat transfer within parabolic trough solar system (Euro-Trough-150-PTSC) is investigated. Several configurations of porous foam with step and uniform porosity are studied. The Monte Carlo Ray Tracing (MCRT) method, the surface-to-surface model, and the Darcy-Brinkman-Forchheimer model are used for heat flux profile, radiation, and the porous medium, respectively. The simulation results show that the rebuilding of the velocity field and the absence of hotspot formation on the absorber tube are achieved by using porous insert. Moreover, the usage of porous medium decreases the thermal resistance. Using porous medium leads to an increase in heat transfer and more pressure drop. If the porous foam is used in the bottom of the absorber tube, the Nusselt number can be increased 3 times as much as the clear absorber tube, but the Darcy friction factor increases by 2.2 times, so the PEC value would be above 1. Moreover, if the absorber tube is partly filled with the porous medium, it has a better performance compared to full-porous. In addition, if the foam is made of SiC, the heat transfer is achieved more effectively in comparison to bronze.
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