**R516A**

R516A is an azeotropic mixture consisting of 77.5 weight% R1234yf, 14.0% R152a and 8.5% R134a. It is considered to be a replacement fluid for R134a. It has a molar mass of 102.58 kg/kmol.

Property data for R516A are provided using a generalized equation of state fitted by F-Chart Software using thermodynamic property data generated by REFPROP. The model is applicable for temperatures between 180 K and 420 K with pressures up to 20 MPa. The reference state is saturated liquid at 0 C for which specific enthalpy and entropy are 200 kJ/kg and 1.0 kJ/kg-K, respectively.

__Transport Data__

The viscosity and thermal conductivity for R516A were estimated using the corresponding states approach described the following references with R1234yf as the reference fluid.

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

The correlation are valid over the same range of temperature as the equation of state.

Surface tension data were fit to data obtained from the REFPROP.