Optimization on thermal performance of the cavity-shaped porous solar receivers

Yishuo Liu, Guilong Dai, Yijian Yang and Longkun Mu

Energy, 2025, vol. 325, issue C

Abstract: This study investigates the thermal performance of cavity-shaped porous solar receivers (C-PSR) designed to reduce peak solid temperature and re-radiation losses by optimizing the matching between the heat transfer fluid mass velocity and concentrated solar flux. In this study, a C-PSR prototype was fabricated and evaluated on an indoor sun simulator platform to validate the heat transfer model. Orthogonal optimization reveals that the single-cavity PSR(SC-PSR) with a divergent cavity minimizes re-radiation losses, the optimal double-cavity PSR(DC-PSR) features the secondary opening radius (R3) equal to the first bottom radius (R2), the secondary bottom radius (R4) is half of the primary cavity's opening radius (R1) and a total cavity depth (L1+L2) is half of the total length(L). Compared to the solid porous solar receiver, the thermal efficiency of the optimal SC-PSR increases by 21.61 %, while the peak solid temperature decreases by 491.19 K at a mass flow rate of 5 g/s. Furthermore, the thermal efficiency of the optimal DC-PSR increases by 21.48 % and the peak solid temperature decreases by 704.89 K than that of S-PSR. This paper presents an innovative approach to enhance the thermal performance of solar receivers.

Keywords: Porous solar receivers; Cavity-shaped; Orthogonal optimization; Thermal efficiency; Concentrated solar flux (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:325:y:2025:i:c:s0360544225018122

DOI: 10.1016/j.energy.2025.136170

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