An experimental study of the thermodynamic properties of 1,1-difluoroethane

T. Tamatsu, T. Sato, H. Sato, K. Watanabe

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20 Citations (Scopus)


Experimental vapor pressures and P-ρ-T data of an important alternative refrigerant, 1, 1-difluoroethane (HFC-152a), have been measured by means of a constant-volume method coupled with expansion procedures. Sixty P-ρ-T data were measured along eight isochores in a range of temperatures T from 330 to 440 K, at pressures P from 1.6 to 9.3 MPa, and at densities ρ from 51 to 811 kg·m-3. Forty-six vapor pressures were also measured at temperatures from 320 K to the critical temperature. The uncertainties of the temperature and pressure measurements are within ±7mK and ±2kPa, respectively, while the uncertainty of the density values is within ±0.1%. The purity of the sample used is 99.9 wt%. On the basis of the measurements along each isochore, five saturation points were determined and the critical pressure was determined by correlating the vapor-pressure measurements. The second and third virial coefficients for temperatures from 360 to 440 K have also been determined.

Original languageEnglish
Pages (from-to)985-997
Number of pages13
JournalInternational Journal of Thermophysics
Issue number6
Publication statusPublished - 1992 Nov 1


  • HFC-152a
  • critical parameters
  • equation-of-state data
  • vapor pressure
  • vaporliquid equilibrium
  • virial coefficient

ASJC Scopus subject areas

  • Condensed Matter Physics


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