Prediction method of both azeotropic and critical points of the binary refrigerant mixtures
Abstract
The prediction of the azeotropic point and the determination of the critical point in binary mixtures is very important in refrigerating industry. In this task, a simple method is presented in order to predict and determine both azeotropic and critical points. Our method employs experimental data and a thermodynamic model. 1,1,1,2-tetrafluoroethane (R134a) in the mixture presents the possibility of inventing the azeotropic and critical properties. The mixtures studied in this work are: Cyclopropane (RC270), Propylene (R1270), Hexafluoroethane (R116) and Carbon dioxide (R744) based on 1,1,1,2-tetrafluoroethane (R134a). The model consists of the Peng–Robinson equation of state (EoS), the Mathias–Copeman alph a function and the Wong-Sandler mixing rules involving the NRTL model. The results proved that there is a good agreement between the predicted values and the experimental data. The presented methods are able to predict the azeotropic and determine critical positions.
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