在全球气候变暖的背景下，以氢氟烯烃类(HFOs)为主要组分的低GWP制冷混合工质成为目前替代工质研究的重要方向。但是其相关基础热力学数据还极为缺乏，因此本申请以HFO-1234yf、HFO-1234ze(E)、HFO-1234ze(Z)与HCs、HFCs组成的HFO/HC二元混合工质，HFO/HFC/HC三元混合工质为研究体系，开展气液相平衡性质、气相PVTx性质以及共沸特性的实验和理论研究。预期获得一批重要的基础实验数据，建立混合工质的气相维里方程，针对PR+vdW关联模型建立能够推算HFOs、HFCs、HCs混合工质体系气液相平衡性质的推算模型，并以此为基础结合实验测量研究HFO/HFC/HC三元混合工质共沸和近共沸性质。研究结果可以为寻求低GWP且性能优异的HFO/HC、HFO/HFC/HC混合工质提供基本数据和理论支持。

In the background of global warming, refrigerant mixtures containing Hydrofluoroolefins (HFOs) are considered as promising candidates because of low GWP values. However, their primary thermodynamic properties are still very limited. In this proposal, HFO/HC binary mixtures and HFO/HFC/HC ternary mixtures containing HFO-1234yf, HFO-1234ze(E) and HFO-1234ze(Z) are selected for experimental and theoretical study on their vapor-liquid equilibria, gaseous PVTx and azeotropic properties. A number of experimental data of these important properties will be obtained. Gaseous Virial equations of state will be built. An estimation method for the VLE of mixtures containing HFOs, HFCs, HCs will be developed for the PR+vdW model. The azeotropic and near-azeotropic properties of HFO/HFC/HC ternary mixtures will be investigated. The results of the study can provided basic data and theoretical support for the research of the HFO/HC and HFO/HFC/HC mixtures with both of low GWP and excellent performances.