Kim, Y Borgnakke, C Sonntag, RE 2024-01-21T18:13:07Z 2024-01-21T18:13:07Z 2021-09-05 1997-06-10 0363-907X https://pubs.kist.re.kr/handle/201004/143736 A new equation of state (EOS) for 1,1,-difluoroethane (R152a) is developed in the form of the Helmholtz free energy. The EOS is valid for temperatures between 213 and 433 K (0.55 < T-r < 1.12) and pressures up to 20 MPa (P-r < 4.4). It covers EOS is valid for temperatures between 213 and 433 K (0.55 < T-4 < 1.12) and pressures up to 20 MPa (P-r < 4.4). It covers the compressed liquid, gas and two-phase regions, R152a, which does not contain any chlorine, is a potentially acceptable alternative refrigerant for chlorofluorocarbons. Chlorofluorocarbon compounds, which are widely used as refrigerants, propellants, foaming agents and cleaning agents, are known to damage the ozone layer that protects the Earth from harmful radiation, The form of the ideal gas Helmholtz free energy is obtained from statistical thermodynamics, and the residual part is determined from experimental data. From a bank of terms that are suggested, an optimum set of terms is selected by a random search method. The results are compared with the experimental data, and tables of the thermodynamic properties of R152a are presented. (C) 1997 by John Wiley & Sons, Ltd. English JOHN WILEY & SONS LTD LIQUID COEXISTENCE CURVE 1,1,1,2-TETRAFLUOROETHANE R-134A THERMODYNAMIC PROPERTIES VAPOR-PRESSURES HEAT-CAPACITY R-152A REFRIGERANTS DENSITY P,RHO,T CFC Equation of state for 1,1-difluoroethane (R152a) Article 10.1002/(SICI)1099-114X(19970610)21:7<575::AID-ER272>3.0.CO;2-F 1 INTERNATIONAL JOURNAL OF ENERGY RESEARCH, v.21, no.7, pp.575 - 589 INTERNATIONAL JOURNAL OF ENERGY RESEARCH 21 7 575 589 scie scopus A1997XG57800001 2-s2.0-0031161807 Energy & Fuels Nuclear Science & Technology Energy & Fuels Nuclear Science & Technology Article LIQUID COEXISTENCE CURVE 1,1,1,2-TETRAFLUOROETHANE R-134A THERMODYNAMIC PROPERTIES VAPOR-PRESSURES HEAT-CAPACITY R-152A REFRIGERANTS DENSITY P,RHO,T CFC 1,1-difluoroethane (R152a) equation of state alternative refrigerant Helmholtz free energy