Bubble-point pressures and liquid densities of binary R-125 + R-143a System

J. V. Widiatmo, H. Sato, K. Watanabe

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18 Citations (Scopus)


Bubble-point pressures and saturated-liquid densities of the binary R-135 (pentafuoroethane) + R- 143a ( 1, 1, 1-trifluoroethane) system have been measured for several compositions at temperatures from 280 to 330 K by means of a magnetic densimeter coupled with a variable-volume cell mounted with a metallic bellows. The experimental uncertainties of the temperature, pressure. and density measurements and the composition determination were estimated to be within ±15 mK, ±13 k Pa, ±0.2%, and ±0.1 wt%, respectively. The purities of the samples used throughout the measurements are 99.98 wt% for R-125 and 99.0 mol % for R- 143a. Based on the present data, the thermodynamic behavior of the vapor-liquid equilibria of this binary refrigerant mixture has been evaluated by using the Peng-Robinson equation for the bubble-point pressures, and the modified Hankinson-Brobst-Thomson equation for the saturated-liquid densities. This was done to identify the optimized binary interaction parameters.

Original languageEnglish
Pages (from-to)801-810
Number of pages10
JournalInternational Journal of Thermophysics
Issue number3
Publication statusPublished - 1995 May 1


  • alternative refrigerants
  • binary mixtures
  • bubble-point pressure
  • saturated-liquid density
  • vapor-liquid equilibria

ASJC Scopus subject areas

  • Condensed Matter Physics


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