A fundamental equation of state for 1,1,1,2-tetrafluoroethane with an intermolecular potential energy background and reliable ideal-gas properties

I. Made Astina, Haruki Sato

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A new Helmholtz fundamental equation of state for 1,1,1,2-tetrafluoroethane was developed by considering its unified relation with intermolecular potential theory and its characteristics of the ideal curves. The equation is valid for temperatures from the triple point to 460 K, and pressures up to 70 MPa, and it behaves in a qualitatively rational manner even in the region far from the range of existing experimental data. The estimated uncertainties in the range of existing experimental data are 0.1% in density for the gaseous and liquid phases, 0.02% in the speed of sound for the gaseous phase, 0.5% in the speed of sound for the liquid phase, and 0.8% in isochoric specific heat for the liquid phase. The uncertainties of saturation properties are 0.05% in vapor pressure, and 0.25 and 0.5% in the densities of the saturated-liquid and saturated-vapor states, respectively. The equation of state has reliable third virial coefficients making it possible to derive reliable thermodynamic properties near saturation in the gaseous phase even at low temperatures that are useful to precisely design refrigeration and air-conditioning systems.

Original languageEnglish
Pages (from-to)103-111
Number of pages9
JournalFluid Phase Equilibria
Volume221
Issue number1-2
DOIs
Publication statusPublished - 2004 Jul 30

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norflurane
ideal gas
Potential energy
Equations of state
liquid phases
equations of state
Gases
potential energy
Acoustic wave velocity
Liquids
saturation
potential theory
air conditioning
Helmholtz equations
acoustics
virial coefficients
vapor pressure
Helmholtz equation
Refrigeration
thermodynamic properties

Keywords

  • Alternative refrigerant
  • Equation of state
  • HFC refrigerant
  • Intermolecular potential theory
  • Thermodynamic properties

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

A fundamental equation of state for 1,1,1,2-tetrafluoroethane with an intermolecular potential energy background and reliable ideal-gas properties. / Astina, I. Made; Sato, Haruki.

In: Fluid Phase Equilibria, Vol. 221, No. 1-2, 30.07.2004, p. 103-111.

Research output: Contribution to journalArticle

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