摘要
A new crossover equation of state in the dimensionless Helmholtz free energy for the thermodynamic properties of 1, 1,1 ) 2-tetrafluoroethane (R 134a ) has been developed that incorporates singular thermodynamic behavior near the critical point with regular thermodynamic behavior far from the critical point. The equation of state is capable of representing all the thermodynamic properties of R134a including press ure-density-temperature properties, the isochoric and isobaric heat capacities, and the sound velocity in the entire region,at temperatures from the triple point to 453K, pressures up to 70MPa and densities from zero to three times and a half the critical density. The results have been compared with experimental thermodynamic-property data in the entire region and with other equations of state near the critical point.
A new crossover equation of state in the dimensionless Helmholtz free energy for the thermodynamic properties of 1, 1,1 ) 2-tetrafluoroethane (R 134a ) has been developed that incorporates singular thermodynamic behavior near the critical point with regular thermodynamic behavior far from the critical point. The equation of state is capable of representing all the thermodynamic properties of R134a including press ure-density-temperature properties, the isochoric and isobaric heat capacities, and the sound velocity in the entire region,at temperatures from the triple point to 453K, pressures up to 70MPa and densities from zero to three times and a half the critical density. The results have been compared with experimental thermodynamic-property data in the entire region and with other equations of state near the critical point.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1997年第1期13-16,共4页
Journal of Engineering Thermophysics
关键词
状态方程
HFC134A
制冷剂
四氟乙烷
equation of state
critical phenomena
thermodynamic properties
1,1,1,2-tetrafluoroethane, HFC134a
