Thermodynamic-property modeling of HFO-1234ze(E)+HFC-32 mixtures for evaluating cycle performance.

Thermodynamic-property modeling of HFO-1234ze(E)+HFC-32 mixtures was carried out by optimizing the adjustable parameters of the Knuz and Wagner model on the basis of experimental data. Average absolute-deviations in calculated values using the mixture model from experimental data are 0.2% in density, 2.6% in specific heat at constant pressure, 0.7% in bubble-point pressure, 3.7% in the heat capacity of saturated liquid, and 0.2% in the density of saturated liquid. The performance of refrigeration cycles using HFO-1234ze(E)+HFC-32 mixtures as a working fluid was calculated changing mixture composition. This calculation has shown that maximum COP is obtained at the mass fraction of w = 0.89 of HFO-1234ze(E).