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以无限大双平行灰体平板等辐射流传热为例,研究了辐射传热的熵流,导出了辐射传热的熵产率,有效能传输效率和理论最佳接收温度的基本通用计算式。通过引入系统黑度的概念,把以上结果应用于复杂辐射传热的热力学分析。针对辐射强度随传递距离不断减弱的辐射传热的非平衡辐射热力学问题,提出辐射强度系数和当量辐射温度的概念,并以太阳能热接收转换器为例,导出了以当量辐射温度表征的辐射能接收转换热效率,熵增强度,有效能输出率,最佳接收温度的计算式,考察了聚光度对提高太阳能接收器有效能输出率的作用。
In this paper, an example is given of the heat transfer of an infinite pair of parallel gray plates. The entropy flow of radiative heat transfer is studied, and the entropy yield of the radiative heat transfer, effective transmission efficiency and theoretical optimum receiving temperature are derived. By introducing the concept of system blackness, the above results are applied to the thermodynamic analysis of complex radiative heat transfer. Aiming at the unbalanced radiation thermodynamics problem of radiation heat transfer with decreasing radiation intensity, the concept of radiation intensity coefficient and equivalent radiation temperature are proposed. Taking the solar heat receiver converter as an example, the radiation energy Receiving conversion heat efficiency, entropy enhancement, the effective output rate, the optimal receiving temperature calculation formula, examines the concentration of the solar receiver to improve the effective energy output rate.