The thermophysical properties models of R1234yf/R134a were developed by using PR EOS with vdW mixing rule and HV mixing rule,respectively.Curves on vapor-liquid equilibrium properties of the mixture were analyzed.It was found that R1234yf/R134a existed azeotropic points.When the mole composition ratio of R1234yf/R134a was 0.533/0.467 and pressure was above 400kPa,the maximum of temperature glide was about 0.01K.The temperature glide was as high as 0.28K at the pressure of 200kPa and the mole composition ratio of 0.178/0.822.Based on residual function method,the enthalpy and entropy calculation formulas of R1234yf/R134a were derived and could be used in the engineering research of R1234yf/R134a direct substitution.%用PR方程结合vdW和HV混合法则建立了R1234yf/R134a的热物性模型,分析了混合物的气液相平衡特性曲线,发现R1234yf/R134a存在共沸点.当R1234yf/R134a的摩尔组分比为0.533/0.467,压力在400kPa以上时,温度滑移最大约0.01K;当摩尔组分比为0.178/0.822,压力为200kPa时,温度滑移最大为0.28K.根据余函数法导出了R1234yf/R134a的焓、熵计算式,可以用于R1234yf/R134a直接替代的工程研究.
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