利用吸收式制冷技术将低品位热量转化为冷能，是实现“节能减排”的重要途径。作为非常有潜力的两种吸收式制冷工质对，HFO+离子液体的全球变暖潜力值较低，但制冷性能较差，而HFC+离子液体制冷性能较好，全球变暖潜力值却较高。针对这个问题，本项目提出将HFO/HFC+离子液体三元混合物作为吸收式制冷工质对的思路，以满足环保和制冷性能两方面的需求。本项目拟围绕HFO/HFC+离子液体的气液相平衡、比热容及制冷性能开展研究，研制HFO/HFC+离子液体气液相平衡和比热容的同步实验测量系统，并获取一批高精度的实验数据；依据实验数据，建立HFO/HFC+离子液体气液相平衡和比热容的普适性理论预测模型；以热力学性质为桥梁，构建工质对组分分子结构与制冷性能的关联模型，并揭示HFO/HFC+离子液体影响制冷性能的微观机理。本项目的研究成果对优选吸收式制冷工质对和提高吸收式制冷系统的性能有着重要的意义。

Using absorption refrigeration technology to convert low-grade heat into cooling energy is an important way to realize "energy saving and emission reduction". As two promising working pairs for absorption refrigeration system, HFO + ionic liquid has low global warming potential, but its refrigeration performance is poor, while HFC + ionic liquid has good refrigeration performance, but its GWP is high. To address this problem, this project proposes an idea that taking the ternary mixture of HFO/HFC + ionic liquid as the working pair of absorption refrigeration system in order to meet the demands of the environmental protection and refrigeration performance. This project intends to investigate the vapor-liquid equilibrium, specific heat capacity and refrigeration performance of HFO/HFC + ionic liquid. An experimental system for the simultaneous measurement of vapor-liquid equilibrium and specific heat capacity of HFO/HFC + ionic liquid will be built and a batch of high-precision experimental data will be obtained. Based on the experimental data, a general prediction model of the vapor-liquid equilibrium and specific heat capacity of HFO/HFC + ionic liquid will be developed. Take thermodynamic properties as a bridge, a correlation model will be developed for the molecular structure of working pair components and the refrigeration performance, and the microscopic mechanism of the effect of HFO/HFC + ionic liquid on the refrigeration performance will be revealed. The research results of this project have important significance for screening the absorption refrigeration working pair and improving the refrigeration performance of absorption refrigeration system.