An accurate generalized model for predict vapor pressure of refrigerants

The examination of the available vapor pressure data in the case of the methane, ethane, propane and butane halogenated refrigerants, allowed the derivation and recommendation of standard equations for this property. In this study a new universal substance-independent equation for vapor pressure as a function of reduced temperature, critical pressure, and acentric factor has been developed to estimate vapor pressures of refrigerants. With the presented model, vapor pressures have been calculated and compared with the data reported in data compilation for 28 refrigerants for 5600 data points, and the overall average absolute percentage deviation is only 0.52%. The accuracy of obtained model has been compared to the mostly used predictive models and the comparison indicates that the proposed method provide more accurate results than other methods used in this work. (C) 2013 Elsevier Ltd and IIR. All rights reserved.