A modified Benedict–Webb–Rubin (MBWR) equation of state has been developed for R152a (1,1‐difluoroethane). The correlation is based on a selection of available experimental thermodynamic property data. Single‐phase pressure–volume–temperature (PVT), heat capacity, and sound speed data, as well as second virial coefficient, vapor pressure, and saturated liquid and saturated vapor density data, were used with multi‐property linear least‐squares fitting to determine the 32 adjustable coefficients of the MBWR equation. Ancillary equations representing the vapor pressure, saturated liquid and saturated vapor densities, and the ideal gas heat capacity were determined. Coefficients for the equation of state and the ancillary equations are given. Experimental data used in this work covered temperatures from 162 K to 453 K and pressures to 35 MPa. The MBWR equation established in this work may be used to predict thermodynamic properties of R152a from the triple‐point temperature of 154.56 K to 500 K and for pressures up to 60 MPa except in the immediate vicinity of the critical point.
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March 1996
Research Article|
March 01 1996
A Modified Benedict–Webb–Rubin Equation of State for the Thermodynamic Properties of R152a (1,1‐difluoroethane)
Stephanie L. Outcalt;
Stephanie L. Outcalt
Thermophysics Division, National Institute of Standards and Technology, Boulder, Colorado 80303‐3328
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Mark O. McLinden
Mark O. McLinden
Thermophysics Division, National Institute of Standards and Technology, Boulder, Colorado 80303‐3328
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J. Phys. Chem. Ref. Data 25, 605–636 (1996)
Article history
Received:
July 25 1995
Received:
November 13 1995
Citation
Stephanie L. Outcalt, Mark O. McLinden; A Modified Benedict–Webb–Rubin Equation of State for the Thermodynamic Properties of R152a (1,1‐difluoroethane). J. Phys. Chem. Ref. Data 1 March 1996; 25 (2): 605–636. https://doi.org/10.1063/1.555979
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