An Equation of State for a New Working Fluid HFC-134a

Chun cheng Piao, Haruki Sato, Koichi Watanabe

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


On the basis of the PVT, specific heat, and saturated-liquid-density data measured by our group, and other available experimental data, an equation of state for HFC-134a (1,1,1,2-tetrafluoroethane, CH2FCF3 was developed. It is a nondimensionalized virial equation of state which has 25 terms and is effective in the range of pressures up to 15 MPa, temperatures from 240 to 480 K, and densities from 0 to 1400 kg/m3. The equation represents reliable PVT measurements within ± 0.5% in pressure in the superheated gaseous and supercritical fluid phases, while within ± 0.5% in density in the compressed liquid phase. The reliability of the derived properties from the equation of state including specific heats, speed of sound, and so on, was confirmed by comparison with reliable experimental data. Speed-of-sound data in the gaseous phase reported by Goodwin and Moldover are reproduced within ±0.1%, and most of the isobaric specific heat data by Saitoh et al. are reproduced within ± 1% by this equation of state.

Original languageEnglish
Pages (from-to)4182-4189
Number of pages8
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number544
Publication statusPublished - 1991


  • Equation of state
  • HFC-134a (1,1,1,2-tetrafluoroethane, CHFCF)
  • Refrigerant
  • Thermophysical Property

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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