New regulations have been approved that only low-GWP refrigerants will be used in developed countries. As mixed refrigerants especially positive azeotropic blends, R1243zf could be a promising substitute component for R134a with similar thermodynamic properties and low GWP. In this study, the VLE data for the binary system of R1243zf + R134a were measured with a recirculation method at six temperatures (243.150, 253.150, 263.150, 273.150, 283.150 and 293.150) K. The measurement uncertainties of the temperatures, pressures and compositions are estimated to be less than 5mK, 800 Pa, 0.005, respectively. All the experimental data were correlated by PR-vdW and PR-HV-NRTL model. The maximum average absolute relative deviation of pressure (AARDp) and average absolute deviation of vapor-phase mole fraction (AADy) for the PR-vdW model are 0.35% and 0.004, respectively, while the maximum AARDp and AADy for PR-HV-NRTL model are 0.29% and 0.004, respectively. Positive azeotropic behavior was exhibited at each temperature investigated.

批准了新法规，规定发达国家仅使用低全球升温潜能值的制冷剂。作为混合制冷剂，尤其是正共沸混合物，R1243zf可能是具有相似热力学性质和低GWP的R134a的有前途的替代组分。在这项研究中，使用再循环方法在六个温度（243.150、253.150、263.150、273.150、283.150和293.150）K下使用再循环方法测量了R1243zf + R134a二元系统的VLE数据。温度，压力和成分的测量不确定度为估计分别小于5mK，800 Pa，0.005。PR-vdW和PR-HV-NRTL模型将所有实验数据进行关联。压力的最大平均绝对相对偏差（AARD p）和气相摩尔分数的平均绝对偏差（AADPR-vdW模型的y）分别为0.35％和0.004，而PR-HV-NRTL模型的最大AARDp和AADy分别为0.29％和0.004。在每个研究温度下均表现出正共沸行为。