Excess Gibbs Energy and Saturation Pressure of the Environmentally Friendly Refrigerant Mixture: R365mfc and R152a
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 1
Abstract
This work presents the saturation pressure of new environmentally friendly refrigerants 1,1-difluoroethane (R152a) and 1,1,1,3,3-Pentafluorbutane (R365mfc), beside their mixture. Special attention was given to enable a highly accurate predicted saturation pressure and excess Gibbs energy data as function of composition in a temperature range of T=260K to T=380K, for the pure fluid and the mixture. The simulation data for the saturation pressure were obtained using the modified Unifac method, Lee Kesler and Hoffman Florin models and validated with the high precision fundamental equations of state by Outcalt and McLinden from National Institute of Standard and Technology (NIST). Among all the model of Lee and Kesler have shown good results for fitting the light component R152a, maximum positive deviation less than 1% was reached. Whereas the model of Hoffman Florin yielded good results for R365mfc, maximum positive deviation less than 2.85% was reached. The excess Gibbs energy function for the mixture was realized in a temperature range of T=260K to T=380K by the modified UNIFAC method.
Authors and Affiliations
Dr. -Ing. Momin E. Abdalla
Keywords
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