Isothermal Properties for Methane, difluoro- (R32)

Fluid Data

Isothermal Data for T = 220.00 K

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Auxiliary Data

Reference States, IIR Convention

Additional fluid properties

References and Notes

Equation of state

Tillner-Roth, R.; Yokozeki, A., An International Standard Equation of State for Difluoroethane (R-32) for Temperatures from the Triple Point at 136.34 K to 435 K and Pressures up to 70 MPa, J. Phys. Chem. Ref. Data, 1997, 26, 6, 1273-1328, https://doi.org/10.1063/1.556002 . [all data]

Tillner-Roth, R. and Yokozeki, A., "An International Standard Equation of State for Difluoromethane (R-32) for Temperatures from the Triple Point at 136.34 K to 435 K and Pressures up to 70 MPa," J. Phys. Chem. Ref. Data, 26(6):1273-1328, 1997.

The estimated uncertainties are 0.05% for density, 0.02% for the vapor pressure, and 0.5%-1% for the heat capacity and speed of sound in the liquid phase. In the vapor phase, the uncertainty in the speed of sound is 0.02%

Auxillary model, Cp0

Tillner-Roth, R. and Yokozeki, A., 1997.

Auxillary model, PX0

Tillner-Roth, R. and Yokozeki, A., 1997.

Thermal conductivity

Marsh, K.N.; Perkins, R.A.; Ramires, M.L.V., Measurement and Correlation of the Thermal Conductivity of Propane from 86 K to 600 K at Pressures to 70 MPa, J. Chem. Eng. Data, 2002, 47, 4, 932-940, https://doi.org/10.1021/je010001m . [all data] Ro, S.T.; Kim, J.Y.; Kim, D.S., Thermal Conductivity of R32 and its Mixture with R134a, Int. J. Thermophys., 1995, 16, 5, 1193-1201, https://doi.org/10.1007/BF02081287 . [all data]

Unpublished; however the fit uses the functional form found in: Marsh, K., Perkins, R., and Ramires, M.L.V., "Measurement and Correlation of the Thermal Conductivity of Propane from 86 to 600 K at Pressures to 70 MPa," J. Chem. Eng. Data, 47(4):932-940, 2002.

The estimated uncertainty of the correlation is 5%, except for the dilute gas and points approaching critical where the uncertainty rises to 10%.

Auxillary model, the thermal conductivity critical enhancement

Olchowy, G.A.; Sengers, J.V., A Simplified Representation for the Thermal Conductivity of Fluids in the Critical Region, Int. J. Thermophysics, 1989, 10, 2, 417-426, https://doi.org/10.1007/BF01133538 . [all data]

Surface tension

Mulero, A.; Cachadiña, I.; Parra, M.I., Recommended Correlations for the Surface Tension of Common Fluids, J. Phys. Chem. Ref. Data, 2012, 41, 4, 043105, https://doi.org/10.1063/1.4768782 . [all data]

Vapor pressure

Cullimore, I.D., 2010.

Functional Form: P=Pc*EXP[SUM(Ni*Theta^ti)*Tc/T] where Theta=1-T/Tc, Tc and Pc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid density

Cullimore, I.D., 2010.

Functional Form: D=Dc*[1+SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid volume

Cullimore, I.D., 2010.

Functional Form: D=Dc*EXP[SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

The fluid data above is also available from the NIST Reference Fluid Thermodynamic and Transport Properties Database. This product includes additional features not available from this web site.

Notes