High Pressure Vapor-liquid Equilibria and Critical Loci for the HFC125-HFC134a System

Hideo Nishiumi; Takahiro Ohno

Korean Journal of Chemical Engineering, Vol.17, No.6, 668-671, November, 2000

DOI10.1007/BF02699115 Export Citation

High Pressure Vapor-liquid Equilibria and Critical Loci for the HFC125-HFC134a System

Hideo Nishiumi^†, and Takahiro Ohno

Chemical Engineering Laboratory, Hosei University, Koganei, Tokyo 184-8584, Japan

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We measured vapor-liquid equilibria (VLE) ranging from 303.75 to 363.15 K and the critical locus for the system of pentafluoroethane (HFC125)-1,1,1,2-tetrafluoroethane (HFC134a). The critical locus exhibited type I behavior by van Konynenberg and Sccot Correlating the VLE data with an extended BWR equation of state, we found the optimum binary interaction parameter for this system 1.0081 and estimated coefficients of performance (C.O.P.) as a mixture refrigerant As a result of the correlation, we found that the HFC125-HFC134a system is a potential alternative refrigerant when mole fraction of HFC125 is lower than 0.6. Calculations showed a 4.9% saving energy in the cycle compared with chlorodifluoromethane (HCFC22), for a composition of 30 mole percent HFC125.

Keywords:Vapor-Liquid Equilibria;Critical Locus;HFC125-HFC134a;Equation of State;C.O.P.

[References]

Nishiumi H, Akita H, Akiyama S, Korean J. Chem. Eng., 14(5), 359 (1997)
Kobayashi M, Nishiumi H, Fluid Phase Equilib., 144(1-2), 191 (1998)
Tiller-Roth R, Li J, Yokozeki A, Sato H, Watanabe K, "Thermodynamic Properties of Pure and Blended Hydrofluorocarbon (HFC) Refrigerants," Japan Society of Refrigerating and Air Conditioning Engineers, Tokyo (1998)
van Konynenburg PH, "Critical Lines and Phase Equilibria in Binary Mixtures," Ph.D. thesis, University of California, Los Angles, California (1968)

[Referenced By]

[1] Nishiumi H, Akita H, Akiyama S, Korean J. Chem. Eng., 14(5), 359 (1997)

[2] Kobayashi M, Nishiumi H, Fluid Phase Equilib., 144(1-2), 191 (1998)

[3] Tiller-Roth R, Li J, Yokozeki A, Sato H, Watanabe K, "Thermodynamic Properties of Pure and Blended Hydrofluorocarbon (HFC) Refrigerants," Japan Society of Refrigerating and Air Conditioning Engineers, Tokyo (1998)

[4] van Konynenburg PH, "Critical Lines and Phase Equilibria in Binary Mixtures," Ph.D. thesis, University of California, Los Angles, California (1968)