On the Calculation of the Virial Coefficients and low Pressure Joule-Thomson Effect for Refrigerant Fluids Using Two Equation of State Models

Abstract

In this paper, we calculate virial coefficients and Joule-Thomson effect at low pressure for refrigerants fluids in order to evaluate the performance of two models of Equations of State (EOS). The studied refrigerants are R123, R124, R143a and R152a. The investigated EOSs are van der Waals type consist of van der Waals (vdW), Redlich-Kwong (RK), Soave- Redlich-Kwong (SRK) and Peng-Robinson (PR). In our work, we use Dieterici model of EOS consist of Dieterici (D) and Dieterici-Carnahan-Starling (DCS). The obtained results show that all EOSs predict the qualitative behavior of the second virial coefficient of refrigerants in wide range temperature but, cannot provide the qualitative behavior of the third virial coefficient of refrigerants in in comparing with experimental data. Quantitatively, the EOSs on the basis of vdW model present good results in wide range of temperatures. Both models of equations of state can also predict qualitative behavior of changing the low pressure J-T coefficient with respect to temperature. Our study shows that the EOSs on the basis of vdW model, especially PR, present better results than the other model in wide range of temperatures.