An equation of state for the thermodynamic properties of R143a (1,1,1-trifluoroethane)
- National Inst. of Standards and Technology, Boulder, CO (United States). Physical and Chemical Properties Div.
Thermodynamic properties of 1,1,1-trifluoroethane (R143a) are expressed in terms of a 32-term modified Benedict-Webb-Rubin (MBWR) equation of state. Coefficients are reported for the MBWR equation and for ancillary equations used to fit the ideal-gas heat capacity, and the coexisting densities and pressure along the saturation boundary. The MBWR coefficients were determined from a multiproperty fit that used the following types of experimental data: PVT; isochoric, isobaric, and saturated-liquid heat capacities; second virial coefficients; speed of sound and properties at coexistence. The equation of state was optimized to the experimental data from 162 to 346 K and pressures to 35 MPa with the exception of the critical region. Upon extrapolation to 500 K and 60 MPa, the equation gives thermodynamically reasonable results. Comparisons between calculated and experimental values are presented.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-91CE23810
- OSTI ID:
- 675516
- Journal Information:
- International Journal of Thermophysics, Vol. 18, Issue 6; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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