为获取热源和有机工质的最佳匹配规律，提高系统热力性能，提出求解工质热源转折温度的新方法及基于工质热源转折温度的工质与热源最优匹配新方法。首先，通过定义潜热熵差比推导出工质热源转折温度的理论公式，并采用蜻蜓算法进行精确求解；其次，与文献[14]对比，验证模型准确性；最后，对比工质热源转折温度与热源温度筛选最优工质。结果表明：选用的15种工质的热源转折温度与文献[14]的对比误差不超过1.62%，验证了工质热源转折温度求解公式的准确性；当热源温度确定时，选择热源转折温度小于热源温度的工质可获得最佳工况；当工质确定时，选择高于该工质热源转折温度的热源温度可获得最佳工况。

In order to obtain the best matching rule between heat source and organic working fluid and improve the thermal performance of system, a new method for solving the shifttemperature of heating source for working fluid and a new method for the optimal matching between working fluid and heat source based on the shifttemperature of heating source for working fluid were proposed. Firstly, the theoretical formula of the shifttemperature of the working fluid heat source was derived by defining the latent heat entropy difference ratio, and the dragonfly algorithm was used to solve it accurately; secondly, compare with the literature 14 to verify the accuracy of model; finally, the optimal working fluid was selected by comparing the shifttemperature of the working fluid heat source and the heat source temperature. The results show that the comparison error between the heat source shifttemperature of 15 kinds of working fluids and the literature 14 is not more than 1.62%,which verifies the accuracy of the solution formula for the heat source shifttemperature of working fluids; when the heat source temperature is determined, the best working condition can be obtained by selecting the working fluid whose shifttemperature is less than the heat source temperature; when the working fluid is determined,the best working condition can be obtained by selecting the heat source temperature higher than the shifttemperature of the working fluid.

TK221

辽宁省教育厅基金项目(LJKZ0367，LJ2020JCL035)；兴辽英才计划项目资助(XLYC1807150)；辽宁工程技术大学学科创新团队项目(LNTU20TD-15)