Isobaric Properties for Dichlorodifluoromethane (R12)
- Fluid Data
- Auxiliary Data
- References and Notes
- Notes
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Fluid Data
Isobaric Data for P = 274.69 psia
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Auxiliary Data
Reference States, IIR Convention
Enthalpy | H = 200 kJ/kg at 0°C for saturated liquid. |
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Entropy | S = 1 J/g*K at 0°C for saturated liquid. |
Additional fluid properties
Critical temperature (Tc) | 233.55 F |
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Critical pressure (Pc) | 599.89 psia |
Critical density (Dc) | 35.27180 lbm/ft3 |
Acentric factor | 0.17948 |
Normal boiling point | -21.554 F |
Dipole moment | 0.510 Debye |
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.
Notes
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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