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Thermal performance analysis on a volumetric solar receiver with double-layer ceramic foam

机译：双层陶瓷泡沫体积太阳能接收器的热性能分析

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Using porous materials has become an effective means to enhance heat transfer. Volumetric receiver is a key component inside the solar thermal systems. The novel concept using double-layer ceramic foam holds great potential for improving the efficiency. The current study aims to investigate the effects of geometric properties of each porous layer on the thermal performance. The local thermal non-equilibrium model is adopted for energy equations of the fluid and solid phases. Radiative transfer in the foam combined the concentrated solar radiation absorption is solved with the modified P1 approximation. The results indicate that the thickness of the first porous layer has significant effect on the temperature field and pressure drop. Compared with the increasing-porosity configuration, the decreasing-porosity configuration tends to achieve higher air outlet temperature and lower solid inlet temperature. In addition, the increasing design of mean cell size shows improved performance compared to the decreasing design. (C) 2015 Elsevier Ltd. All rights reserved.
机译：使用多孔材料已经成为增强热传递的有效手段。容积式接收器是太阳能热系统内部的关键组件。使用双层陶瓷泡沫的新颖概念具有提高效率的巨大潜力。当前的研究旨在研究每个多孔层的几何特性对热性能的影响。液相和固相的能量方程采用局部热非平衡模型。泡沫中的辐射传递与集中的太阳辐射吸收相结合，用改进的P1近似值求解。结果表明，第一多孔层的厚度对温度场和压降具有显着影响。与增加孔隙率的构造相比，减少孔隙率的构造趋于实现更高的空气出口温度和更低的固体入口温度。此外，与减小的设计相比，增加的平均像元大小设计显示出改进的性能。 （C）2015 Elsevier Ltd.保留所有权利。

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