Study Of Vapor-Liquid Equilibrium For Novel HFO Mixed Refrigerants

With the increasing of the global warming,environmental issues have gradually been the focus of attention.At this time,because of its good thermal performance and environmental characteristics,the class of the new refrigerant HFO,a new generation of low GWP environmental protection refrigerant quality gradually get more attention and become a popular research.The pure component refrigerant is generally difficult to achieve both excellent refrigeration performance and environmental protection,but mixed refrigerant through different ratio can be a very good solution to this problem.The latent heat of HFO is small,at the same time,R32 has big latent heat and good thermal conductivity,it is commonly used in the refrigeration systems,and CO₂ is widely present in nature,so in this paper,we choose the mixtures of HFO-1234yf,HFO-1234ze,R32and CO₂ to calculate the thermodynamic properties.Via analyzing the experimental principle and uncertainty,the quality experimental data were collected.At the same time,the pure characteristic parameters of PRSV and PRSV2 equations were obtained according to the saturated vapour pressure data of the pure components of the mixed working fluid.The saturated vapour pressure of pure components under PR,PRSV and PRSV2 equations were calculated,through analyzing the deviation between the experimental value and the calculated value to verify the correctness of material properties parameters.Based on the experimental data collected,the binary interaction coefficients of R32/HFO-1234yf,CO₂/HFO-1234yf and R32/HFO-1234ze were obtained under the three equations of PR,PRSV and PRSV2.On the basis of this,the vapour-liquid equilibrium of R32/HFO-1234yf,CO₂/HFO-1234yf and R32/HFO-1234ze were calculated under the equations of PR,PRSV and PRSV2,and the calculated values were obtained under different equations.The correctness of the binary interaction coefficient was verified by comparing the two parameters of the maximum absolute relative deviation and the average absolute relative deviation between the calculated and the experimental values.