Ideal-Gas Heat Capacities and Virial Coefficients of HFC Refrigerants

A. Yokozeki, H. Sato, K. Watanabe

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Thermodynamic properties of HFC (hydrofluorocarbon) compounds have been extensively studied with worldwide interest as alternative refrigerants. Both quality and quantity in the experimental data far exceed those for the CFC and HCFC refrigerants. These data now provide a great opportunity to examine the validity of theoretical models, and vice versa. Among them, the ideal-gas heat capacity (C0p) and virial coefficients derived from the experimental data are of particular interest, since they are directly related to the intramolecular and intermolecular potentials through the statistical mechanical procedure. There have been some discrepancies reported in the observed and theoretical C0p for HFC compounds. We have performed new calculations of C0p for several HFCs. The present results are consistent with the selected experimental values. The second (B) and third (C) virial coefficients have been reported for these HFC refrigerants from speed of sound data and Burnett PVT data. Often, a square well-type intermolecular potential is employed to correlate the data. However, the model potential cannot account consistently for both B and C coefficients with the same potential parameters. We have analyzed the data with the Stockmayer potential and obtained self-consistent results for various HFC (R-23, R-32, R-125, R-134a, R-143a, and R-152a) compounds with physically reasonable potential parameters.

Original languageEnglish
Pages (from-to)89-127
Number of pages39
JournalInternational Journal of Thermophysics
Volume19
Issue number1
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Heat capacity
  • Hydrofluorocarbons
  • Ideal gas
  • Stockmayer potential
  • Virial coefficient

ASJC Scopus subject areas

  • Condensed Matter Physics

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