A rational fundamental equation of state for pentafluoroethane with theoretical and experimental bases

I. M. Astina, H. Sato

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Abstract

A fundamental equation of state for pentafluoroethane was established on the basis of not only assessment of the experimental data but also by introducing parameters for virial coefficients having a theoretical background in statistical thermodynamics. The equation of state has a range of validity for temperatures from the triple point up to 500 K and pressures up to 70 MPa. The estimated uncertainties of the equation are 0.1% for the vapor pressure, 0.15% in density for the saturated-liquid phase, 0.5% in density for the saturated-vapor phase, 0.1% in density for the liquid phase, 0.1% in pressure for the gaseous phase, 0.5% in density for the supercritical region, 0.01% in speed of sound for the gaseous phase, 0.9% in speed of sound for the liquid phase, 0.5% in isobaric specific heat for the liquid phase, and 1.2% in isochoric specific heat for the liquid phase. The derived specific heats in the gaseous phase are close to the values from the virial equation of state with the second and third virial coefficients derived from intermolecular potential models and precise speed-of-sound measurements.

Original languageEnglish
Pages (from-to)113-131
Number of pages19
JournalInternational Journal of Thermophysics
Volume25
Issue number1
DOIs
Publication statusPublished - 2004 Jan 1

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Keywords

  • Equation of state
  • HFC refrigerants
  • Intermolecular potential model
  • R125
  • Thermodynamic properties

ASJC Scopus subject areas

  • Condensed Matter Physics

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