采用R1234ze(E)/R245fa的非共沸混合工质有机朗肯循环系统实验研究

非共沸混合工质具有的温度滑移特性能有效提升有机朗肯循环（organic Rankine cycle，简称为ORC）系统的性能，具有重要的研究意义。本文介绍了ORC系统测试试验台，建立了非共沸混合工质系统热力学分析模型，通过实验研究了工质流量对混合工质ORC系统的运行性能及换热特性的影响，并且与纯工质ORC系统进行了对比。结果表明，在系统工质流量较大时，采用混合工质R1234ze（E）/R245fa的ORC系统性能具有明显的提升。

An Experimental Study of Zeotropic-Mixture Organic Rankine Cycle System Utilizing R1234ze (E)/R245fa

The temperature slip characteristic of zeotropic-mixtures, which can effectively improve the performance of the ORC system, has an essential investigation value. First the ORC system test bench was introduced, and then a zeotropic-mixture system model for a thermodynamic analysis was established. Next, the effect of zeotropic-mixture mass flow rate on the ORC system operation performance and the heat transfer characteristics were experimentally studied, and the results compared with those of the ORC with pure working medium system. The results indicate that the performance of the ORC utilizing zeotropic-mixture R1234ze (E)/R245fa has an obvious improvement.