传热规律对内可逆四热源吸收式热变换器性能的影响

The Effect of Heat Transfer Law on the Performance of an Endoreversible Four-heat-reservoir Absorption Heat-transformer

建立了传热规律为Q∝△ (Tn)时内可逆四热源吸收式热变换器循环模型 ,导出了循环泵热率和泵热系数之间的一般关系 ;并导出了传热服从线性唯象定律时的基本优化关系、性能极值、循环中工质的最佳工作温度和换热器传热面积的最佳分配关系 ;通过数值算例分析了传热规律对循环性能的影响规律 。

An endoreversible four-heat-reservoir absorption heat-transformer cycle model with heat transfer law of Q∝△(T n) is established.The general relation between the heating load and coefficient of performance(COP)with Q∝△(T n);the fundamental optimal relation,the maximum heating load and the corresponding COP,the optimal temperatures of working substance,as well as the optimal heat transfer surface areas distribution with linear phenomenological heat transfer law are derived.Moreover,the effect of heat transfer law on the performance of absorption heat-transformer is analyzed and the performance is compared with the optimal distribution of the overall heat transfer surface area or not by numerical example.