Isobaric Properties for Dichlorodifluoromethane (R12)

The following adjustments were made to the specified data range:

Fluid Data

Isobaric Data for P = 274.69 psia

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Auxiliary Data

Reference States, IIR Convention

Additional fluid properties

References and Notes

Equation of state

Marx, V., Pruss, A., and Wagner, W., "Neue Zustandsgleichungen fuer R 12, R 22, R 11 und R 113. Beschreibung des thermodynamishchen Zustandsverhaltens bei Temperaturen bis 525 K und Druecken bis 200 MPa," Duesseldorf, VDI Verlag, Series 19 (Waermetechnik/Kaeltetechnik), No. 57, 1992.

The uncertainties in density are 0.2% below the critical point temperature and increases to 1% in and above the critical region. The uncertainties for vapor pressures are 0.2% above 200 K and greater than 1% below 200 K. The uncertainties in heat capacities and sound speeds are 1% each.

Auxillary model, Cp0

Marx, V., Pruss, A., and Wagner, W., 1992.

Note: Marx et al. give a Helmholtz form for the ideal gas term; it has been converted to a Cp0 form, by the transform:

Cp0/R = (1 + a_3) + SUMReference entry not found in database. where U_i = omega_i*T_n/T, T_n = Tcrit, and the a_i and omega_i are the original coefficients given by Marx.

Auxillary model, PX0

Marx, V., Pruss, A., and Wagner, W., 1992.

Note: Marx et al. give a Helmholtz form for the ideal gas term; it has been converted to a Cp0 form, by the transform:

Cp0/R = (1 + a_3) + SUMReference entry not found in database. where U_i = omega_i*T_n/T, T_n = Tcrit, and the a_i and omega_i are the original coefficients given by Marx.

Transport model

Klein, S.A.; McLinden, M.O.; Laesecke, A., An Improved Extended Corresponding States Method for Estimation of Viscosity of Pure Refrigerants and Mixtures, Int. J. Refrig., 1997, 20, 3, 208-217, https://doi.org/10.1016/S0140-7007(96)00073-4 . [all data] Donaldson, A.B., On the Estimation of Thermal Conductivity of Organic Vapors. Data for Some Freons, Ind. Eng. Chem. Fundam., 1975, 14, 4, 325-328, https://doi.org/10.1021/i160056a008 . [all data]

VISCOSITY The ECS parameters for viscosity were based on the data of: Assael, M.J., Polimatidou, S.K., Vogel, E., and Wakeham, W.A., "Measurements of the Viscosity of R11, R12, R141b, and R152a in the Temperature Range 270-340 K at Pressures up to 20 MPa," Int. J. Thermophys., 15(4):575-589, 1994. Kumagai, A. and Takahashi, S., "Viscosity of Saturated Liquid Fluorocarbon Refrigerants from 273 to 353 K," Int. J. Thermophys., 12(1):105-117, 1991. Average absolute deviations of the fit from the experimental data are: Assael: 0.64%; Kumagai: 2.45%. Overall: 1.00%.

The Lennard-Jones parameters were estimated from corresponding states with R134a and 298 K as a reference.

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