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Heat Capacities and Joule–Thomson Coefficients of HFC Refrigerants

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Abstract

In this report, we have examined the behavior of heat capacities and Joule–Thomson coefficients in low- and moderate-density regions based on recent theoretical studies of the ideal-gas heat capacity and virial coefficients of R-32, R-125, R-134a, R-143a, and R-152a. The results have been compared with those derived from empirical equations of state which have been recently developed, based on a large quantity of experimental data for these refrigerants. Both results are in good agreement. Proper behaviors for these second-derivative properties justify the use of the empirical equations of state in low-temperature and low-density regions where no experimental data are available.

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REFERENCES

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Authors and Affiliations

  1. Department of System Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223, Japan

    A. Yokozeki (Visiting Professor from DuPont Fluoroproducts Laboratory), H. Sato & K. Watanabe

  2. CRP-711, Wilmington, Delaware, 19880, U.S.A

    A. Yokozeki (Visiting Professor from DuPont Fluoroproducts Laboratory)

Authors
  1. A. Yokozeki
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  2. H. Sato
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  3. K. Watanabe
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Yokozeki, A., Sato, H. & Watanabe, K. Heat Capacities and Joule–Thomson Coefficients of HFC Refrigerants. International Journal of Thermophysics 20, 141–148 (1999). https://doi.org/10.1023/A:1021486432011

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  • DOI: https://doi.org/10.1023/A:1021486432011

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