氢氟烃(HFC)/氢氟烃和氢氟烃/碳氢(HC)混合物是两类重要的制冷工质。采用PR状态方程结合Horon-Vidal(HV)混合规则对7种HFC/HFC和7种HFC/HC二元混合物的气液相平衡性质进行了计算,并与PR状态方程结合van der Waals(vdW)混合规则的计算结...氢氟烃(HFC)/氢氟烃和氢氟烃/碳氢(HC)混合物是两类重要的制冷工质。采用PR状态方程结合Horon-Vidal(HV)混合规则对7种HFC/HFC和7种HFC/HC二元混合物的气液相平衡性质进行了计算,并与PR状态方程结合van der Waals(vdW)混合规则的计算结果进行了对比。结果表明,HFC/HFC体系组元性质比较接近,非理想性不强,vdW混合规则即可达到较理想计算效果,HV混合规则对计算精度的提升有限;对非理想性较强的HFC/HC体系,vdW混合规则对共沸性质的描述不够理想,HV混合规则可以显著提升相平衡的计算精度。展开更多
At present,the environment impact of refrigerants has been given attention.The binary mixture R152a/R1234ze(E)is an environmentally friendly refrigerant,which solves problems of poor cooling performance of the R1234ze...At present,the environment impact of refrigerants has been given attention.The binary mixture R152a/R1234ze(E)is an environmentally friendly refrigerant,which solves problems of poor cooling performance of the R1234ze(E)cycle and flammability of R152a.In order to obtain its basic thermal and physical parameters,it is necessary to carry out vapor-liquid equilibrium(VLE)research,and the cubic equation of states(EOS)is often used in the calculation of the thermodynamic properties of mixtures.In this paper,the VLE predicted models for R152a/R1234ze(E)in the temperature range of 298.15-328.15 K were constructed using Soave-Redlich-Kwong(SRK),Peng-Robinson(PR)equations of state(EOS)combined with van der Waals(vd W),Huron-Vidal(HV)mixing rules,respectively.The equilibrium pressures and vapor-phase mole fractions of the models were obtained by calculation,and all four models presented an extreme correlation with the experimental data.And it can be concluded that the calculated results of the PR+HV model are closer to the experimental data than those of the other three models,with the average absolute deviation of 0.0027 for vapor-phase mole fraction(AAD(ycal))and the average absolute relative deviation of 0.243%for equilibrium pressure(AARD(pcal)),which provides a basis for accurately calculating the thermophysical properties of the mixture R152a/R1234ze(E).展开更多
文摘氢氟烃(HFC)/氢氟烃和氢氟烃/碳氢(HC)混合物是两类重要的制冷工质。采用PR状态方程结合Horon-Vidal(HV)混合规则对7种HFC/HFC和7种HFC/HC二元混合物的气液相平衡性质进行了计算,并与PR状态方程结合van der Waals(vdW)混合规则的计算结果进行了对比。结果表明,HFC/HFC体系组元性质比较接近,非理想性不强,vdW混合规则即可达到较理想计算效果,HV混合规则对计算精度的提升有限;对非理想性较强的HFC/HC体系,vdW混合规则对共沸性质的描述不够理想,HV混合规则可以显著提升相平衡的计算精度。
基金supported by the National Natural Science Foundation of China(22068024).
文摘At present,the environment impact of refrigerants has been given attention.The binary mixture R152a/R1234ze(E)is an environmentally friendly refrigerant,which solves problems of poor cooling performance of the R1234ze(E)cycle and flammability of R152a.In order to obtain its basic thermal and physical parameters,it is necessary to carry out vapor-liquid equilibrium(VLE)research,and the cubic equation of states(EOS)is often used in the calculation of the thermodynamic properties of mixtures.In this paper,the VLE predicted models for R152a/R1234ze(E)in the temperature range of 298.15-328.15 K were constructed using Soave-Redlich-Kwong(SRK),Peng-Robinson(PR)equations of state(EOS)combined with van der Waals(vd W),Huron-Vidal(HV)mixing rules,respectively.The equilibrium pressures and vapor-phase mole fractions of the models were obtained by calculation,and all four models presented an extreme correlation with the experimental data.And it can be concluded that the calculated results of the PR+HV model are closer to the experimental data than those of the other three models,with the average absolute deviation of 0.0027 for vapor-phase mole fraction(AAD(ycal))and the average absolute relative deviation of 0.243%for equilibrium pressure(AARD(pcal)),which provides a basis for accurately calculating the thermophysical properties of the mixture R152a/R1234ze(E).
