有机朗肯循环是中低品位热能高效利用的有效技术之一，分液冷凝有机朗肯循环（LSCORC）是基于分液冷凝传热强化的新型热力循环。为寻找新型环保替代工质，建立LSCORC系统的热力学模型，以最大化净输出功为目标，重点考虑了雅各布数、冷热源换热匹配对系统性能的影响，对R245fa/HFOs工质进行了对比筛选。结果表明：工质的雅各布数越大，其净输出功越小；在基础工况下，R245fa/R1336mzz(Z)的热力性能及热经济性表现最佳；当热源参数变化时，雅各布数较小工质的性能表现普遍优于雅各布数较大的工质组合；当冷源参数变化时，在分液冷凝器两个流程中温度滑移和冷源温升匹配越好的工质组合，其系统净输出功越大。

Organic Rankine cycle is one of the effective technologies for medium and low grade thermal energy recovery. Liquid separation condenserbased organic Rankine cycle (LSCORC) is a new type of thermodynamic cycle based on liquidvapor separation condensation heat transfer enhancement. In order to search for new environmentally friendly alternative working fluids, a thermodynamic model of the LSCORC system was established, with the goal of maximizing net output power, focusing on the Jakob number and the impact of the heat source and heat sink heat transfer matching on system performance, and the R245fa/HFOs working fluids were compared and selectd. The results show that the greater the Jakob number of the working fluid, the smaller the net output power; under the basic operating conditions, R245fa/R1336mzz(Z) has the best thermal performance and thermal economy; when the heat source parameters change, the performance of the working fluid with a smaller Jakob number is generally better than that of a working fluid combination with a larger Jakob number; when the heat sink parameters change, the working fluid with close match of temperature glide and the temperature rise of heat sink in two flow processes of liquidvapor seperation condenser, has the greater net output power.

TM61

国家自然科学基金面上项目（51876043）