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Optimization of the rectification factor of radiative thermal diodes based on two phase-change materials

机译：基于两相改变材料的辐射热二极管整流因子的优化

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摘要

We have theoretically studied and optimized the thermal rectification of plane, cylindrical and spherical radiative thermal diodes operating with terminals of two phase-change materials, whose emissivi-ties significantly change within a narrow interval of temperatures. Analytical expressions for the optimal rectification factors of these three diodes are derived and analyzed comparatively. Optimal rectification factors of 82%, 86% and 90.5% are obtained for the plane, cylindrical and spherical diodes made up with terminals of Ge_2Sb_2Te_5 and VO_2 operating with a temperature difference of 450 - 300 = 150 K, respectively. The spherical geometry thus represents a suitable shape to optimize the rectification of radiative heat currents. Furthermore, it is shown that higher rectification factors can potentially be achieved by using phase-change materials with emissivities contrasts higher than those of Ge_2Sb_2Te_5 and VO_2. We demonstrate that radiative thermal diodes based on two phase-change materials are able to operate with rectification factors higher than the corresponding ones of diodes involving a single phase-change material. The obtained results thus shed light on the phase-change materials required for optimizing the rectification factor of radiative thermal diodes with different geometries.
机译：理论上我们已经研究过，并优化了使用两个相变材料的端子操作的平面，圆柱和球形辐射热二极管的热整流，其发射率在狭窄的温度间隔内显着变化。相比之下，推导出和分析了这三个二极管的最佳整流因子的分析表达。对于具有450-300 = 150 k的温度差的GE_2SB_2TE_5和VO_2的端子，可以获得82％，球形二极管的最佳整流因子82％，86％和90.5％。因此，球形几何形状表示合适的形状，以优化辐射热电流的整流。此外，示出可以通过使用高于Ge_2SB_2TE_5和VO_2的相变材料来实现更高的整流因子。我们证明基于两个相变材料的辐射热二极管能够以高于涉及单相改变材料的相应二极管的整流因子来操作。因此，所获得的结果在优化具有不同几何形状的辐射热二极管的整流因子所需的相变材料上的光。

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