摘要
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400k Pa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200k Pa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。
The thermophysical properties models of R1234yf/R134a were developed by using PR EOS with vdW mixing ruleand HV mixing rule,respectively.Curves on vapor-liquid equilibrium properties of the mixture were analyzed.It was found thatR1234yf/R134a existed azeotropic points.When the mole composition ratio of R1234yf/R134a was0.533/0.467and pressure wasabove400kPa,the maximum of temperature glide was about0.01K.The temperature glide was as high as0.28K at the pressure of200kPa and the mole composition ratio of0.178/0.822.Based on residual function method,the enthalpy and entropy calculationformulas of R1234yf/R134a were derived and could be used in the engineering research of R1234yf/R134a direct substitution.
作者
孙维栋
张鹏
张昌
SUN Wei-Dong;ZHANG Peng;ZHANG Chang(Wuhan Textile University,Wuhan 430200,China)
出处
《流体机械》
CSCD
北大核心
2017年第8期78-83,共6页
Fluid Machinery
