A thermodynamic equation of state for pentafluoroethane (R-125)

H. Sunaga, R. Tillner-Roth, H. Sato, K. Watanabe

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We developed a fundamental equation of state for pentafluoroethane (R-125, CHF2CF3) which is represented in terms of a non-dimensional Helmholtz free energy. The equation has been established on the basis of selected measurements of the pressure-density-temperature relation, speed of sound, heat capacities, and saturation properties. Linear and non-linear regression analysis was employed to determine the functional form and the numerical parameters. The equation represents all the thermodynamic properties of R-125 in the liquid and gaseous phases for temperatures between the triple point and 470 K, and pressures up to 35 MPa. The uncertainties are estimated to be about ±0.05% or 0.1 kPa for the vapor pressure, ±0.05% for the liquid and vapor densities, about ±1% for the isobaric and isochoric heat capacities in the liquid, and ±0.5% or ±0.02% for the speed of sound in the liquid and vapor, respectively.

Original languageEnglish
Pages (from-to)1623-1635
Number of pages13
JournalInternational Journal of Thermophysics
Volume19
Issue number2-6
Publication statusPublished - 1998 Nov

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Equations of state
equations of state
Acoustic wave velocity
Thermodynamics
thermodynamics
Specific heat
Liquids
liquids
specific heat
vapors
Density of liquids
Density of gases
acoustics
Vapor pressure
Regression analysis
vapor pressure
Free energy
regression analysis
liquid phases
Thermodynamic properties

Keywords

  • Equation of state
  • HFCs
  • Pentafluoroethane
  • R-125
  • Refrigerant
  • Thermodynamic properties

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes
  • Physics and Astronomy (miscellaneous)

Cite this

Sunaga, H., Tillner-Roth, R., Sato, H., & Watanabe, K. (1998). A thermodynamic equation of state for pentafluoroethane (R-125). International Journal of Thermophysics, 19(2-6), 1623-1635.

A thermodynamic equation of state for pentafluoroethane (R-125). / Sunaga, H.; Tillner-Roth, R.; Sato, H.; Watanabe, K.

In: International Journal of Thermophysics, Vol. 19, No. 2-6, 11.1998, p. 1623-1635.

Research output: Contribution to journalArticle

Sunaga, H, Tillner-Roth, R, Sato, H & Watanabe, K 1998, 'A thermodynamic equation of state for pentafluoroethane (R-125)', International Journal of Thermophysics, vol. 19, no. 2-6, pp. 1623-1635.
Sunaga H, Tillner-Roth R, Sato H, Watanabe K. A thermodynamic equation of state for pentafluoroethane (R-125). International Journal of Thermophysics. 1998 Nov;19(2-6):1623-1635.
Sunaga, H. ; Tillner-Roth, R. ; Sato, H. ; Watanabe, K. / A thermodynamic equation of state for pentafluoroethane (R-125). In: International Journal of Thermophysics. 1998 ; Vol. 19, No. 2-6. pp. 1623-1635.
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