Representation Of The Boundary Conditions For Refrigerant Mixtures With The Lemmon-Jacobsen Equation Of State

Vapour-liquid equilibria (VLE) data are within the most important experimental data to correctly represent the mixtures' behaviour at the saturation boundaries. In the last years, the VLE of several new binary mixtures have been studied by our group in order to find possible alternatives for the traditional refrigerants. The data have been correlated with the Lemmon-Jacobsen model, which is the base for the Refprop 6.0 database, by regressing the interaction parameters used in the model mixing rules. The results obtained and a comparison with the calculation performed with the Refprop 6.0, where ideal parameters are adopted for the mixtures here considered, show the importance to define the interaction parameters on the base of experimental data to properly represent the boundary conditions. The influence of a proper choice of the interaction parameters in the calculation of the performance (COP and volumetric refrigerating capacity) of the mixtures as working fluids in ideal refrigerating cycles is shown also.