Isothermal Properties for Methane, difluoro- (R32)
- Fluid Data
- Auxiliary Data
- References and Notes
- Notes
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Fluid Data
Isothermal Data for T = 220.00 K
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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) | 351.255 K |
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Critical pressure (Pc) | 57.06 atm |
Critical density (Dc) | 0.424000 g/ml |
Acentric factor | 0.2769 |
Normal boiling point | 221.499 K |
Dipole moment | 1.978 Debye |
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 [all data]Unpublished; however the fit uses the functional form found in: Marsh, K., Perkins, R., and Ramires, M.L.V., "Measurement and Correlation of the Thermal Conductivity of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.
Notes
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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