Abstract
Thermodynamic property model explicit in the Helmholtz energy is presented for the R-32/1234yf mixture. The Helmholtz energy of the mixture is expressed as the sum of the ideal mixture contribution and the contribution from mixing. The most accurate pure-fluid equations of state are incorporated to calculate the ideal mixture contribution. The contribution from mixing is determined by fitting to available experimental data. The estimated uncertainties in calculated properties from the model are 1% for the bubble point pressure and 0.2% for liquid density. The critical parameters of the mixture are reasonably represented with the model.
