An equation of state for the thermodynamic properties of R143a (1,1,1-trifluoroethane)

Journal Article · Sat Nov 01 04:00:00 EST 1997 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF02575344· OSTI ID:675516

Outcalt, S L; McLinden, M O ^[1]

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1. 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, Journal Name: International Journal of Thermophysics Journal Issue: 6 Vol. 18; ISSN IJTHDY; ISSN 0195-928X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
EQUATIONS OF STATE
FLUORINATED ALIPHATIC HYDROCARBONS
MATERIAL SUBSTITUTION
REFRIGERANTS
THERMODYNAMIC PROPERTIES