不可逆四热源吸收式热变换器的最优性能

在恒温内可逆四热源吸收式热变换器循环模型的基础上,建立了线性(牛顿)传热定律下考虑泵热空间向环境的热漏、工质的内部牦散以及工质与外部热源间的热阻损失的不可逆四热源吸收式热变换器循环模型。导出了在总换热面积一定的条件下,循环泵热率和泵热系数的基本优化关系、最大泵热率和相应的泵热系数、最大泵热系数和相应的泵热率以及最佳工质工怍温度和最佳换热面积分配关系。

THE OPTIMAL PERFORMANCE OF AN IRREVERSIBLE FOUR-HEAT-RESERVOIR ABSORPTION HEAT TRANSFORMER

On the basis of an endoreversible absorption heat transformer cycle, an irreversible four-heat-reservoir cycle model is built by taking account the heat resistance, heat leak and irreversibilities due to the internal dissipation of the working fluid. The heat transfer between the heat reservoirs and the working substance is assumed to obey linear (Newtonian) heat transfer law, and the overall heat transfer surface area of the four heat exchangers is assumed to be constant. The fundamental optimal relation between the coefficient of performance and the heating load, the maximum coefficient of performance and the corresponding heating load, the maximum heating load and the corresponding coefficient of performance, as well as the optimal temperatures of the working substance and the optimal distribution of the heat-transfer surface areas of the cycle are derived by using finite-time thermodynamics.