**R227ea**

R227ea provides thermodynamic properties for R227ea (1,1,1,2,3,3,3-heptafluoropropane, Molar mass =170.03 g/mole) using the Fundamental Equation of State, as described by:

Lemmon, E.W, and Span, R. "Thermodynamic Properties of R.227ea, R.365mfc, R.115, and R-13I1",

J. Chem. Eng. Data 2015, 60, 3745-3758

**Reference State **

** ** h = 200 kJ/kg, s = 1 kJ/kg-K for saturated liquid at 0 C. The reference state can be changed using the $Reference directive.

Range of applicability for equation of state:

146.35 K < T < 475 K

0 < P < 60 MPa

__Transport Data__

The viscosity and thermal conductivity for the liquid phase are from:

A. P. Froba, C. Botero,and A. Leipertz

Thermal Diffusivity, Sound Speed, Viscosity, and Surface Tension of R227ea (1,1,1,2,3,3,3-Heptafluoropropane)

*International Journal of Thermophysics*, Vol. 27, No. 6, November 2006.

The correlation for liquid viscosity is valid for temperatures between 253 and 372 K. The correlation for liquid conductivity is valid for temperature between 393.2 and 374.7 K.

Gas phase viscosity and thermal conductivity for temperatures between 147 K and 475 K are estimated using a corresponding states approach as described in:

Klein, S.A., McLinden, M.O., and Laesecke , A.,

"An improved extended corresponding states method for estimation of viscosity of pure refrigerants and mixtures",

*Int. J. of Refrigeration*, 20, pp. 208-217, 1997

McLinden et al.,

"An extended corresponding states model for the thermal conductivity of refrigerants and refrigerant mixtures",

*Int. J. of Refrigeration*, 23, pp. 43-63, 2000

__Surface tension data are provided using the information in:__

Mulero, A., Cachadina, I, and Parra, M.

"Recommended Correlations for the Surface Tension of Common Fluids"

J.Phys. Chem Ref. Data, Vol. 41, No.4, 2012