A rigorous thermodynamic property model for fluid-phase 1,1-difluoroethane (R-152a)

I. M. Astina, H. Sato

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A new thermodynamic property model for the Helmholtz free energy with rational third virial coefficients for fluid-phase 1,1-difluoroethane (R-152a) was developed. The model was validated by existing experimental data for temperatures from the triple point to 450 K and pressures up to 60 MPa. Reasonable behavior of the second and third virial coefficients was confirmed from intermolecular potential models. The estimated uncertainties are 0.1% in density for the gaseous and liquid phases, 0.4% in density for the supercritical region, 0.05% in speed of sound for the gaseous phase, 2% in speed of sound for the liquid phase, and 1% in specific heat capacities for the liquid phase. From the reasonable behavior of the ideal curves and the third virial coefficients, the model can be assumed reliable in representing the thermodynamic properties not only at states with available experimental data but also at states for which no experimental data are available.

Original languageEnglish
Pages (from-to)1713-1733
Number of pages21
JournalInternational Journal of Thermophysics
Issue number6
Publication statusPublished - 2004 Nov
Externally publishedYes


  • 1,1-difluoroethane
  • HFC refrigerant
  • Helmholtz energy equation of state
  • Intermolecular potential
  • R-152a
  • Thermodynamic model
  • Virial coefficients

ASJC Scopus subject areas

  • Condensed Matter Physics


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