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

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

研究成果: Article査読

24 被引用数 (Scopus)


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.

ジャーナルInternational Journal of Thermophysics
出版ステータスPublished - 1998 11

ASJC Scopus subject areas

  • Condensed Matter Physics

フィンガープリント 「A thermodynamic equation of state for pentafluoroethane (R-125)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。