An equation of state for 1,1-difluroethane (HFC 152a)

Takeshi Tamatsu, Haruki Sato, Koichi Watanabe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


An equation of state for 1,1-difluoroethane (HFC 152a, CH3CHF2) has been developed on the basis of reliable experimental data including PVT, liquid Cp, and saturated-liquid-density data measured by our group. It is a non-dimensionalized virial equation whose functional form is the same as that originally developed for 1,1,1,2-tetrafluoroethane (HFC 134a) in our group. The effective range is for pressures up to 15 MPa, temperatures from 230 to 450 K, and densities to 1000 kg m-3. The equation represents reliable PVT measurements within ± 1% in pressure for the superheated vapour and supercritical fluid, while within ±0.5% in density for the compressed liquid. In addition, it should be noted that the equation represents the other essential thermodynamic properties including vapour pressures, saturated-liquid/ vapour densities, isobaric/isochoric specific heats and sound velocity in both the liquid and gaseous phase of HFC 152a.

Original languageEnglish
Pages (from-to)347-352
Number of pages6
JournalInternational Journal of Refrigeration
Issue number5
Publication statusPublished - 1993


  • R152a
  • calculation
  • equation of state
  • measurement
  • refrigerant

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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