Abstract
The present study concerns p–T–x phase equilibria measurements involving two working fluid pairs (refrigerant + organic solvent), namely, 1,1,1,2-tetrafluoroethane (R134a) + N,N-dimethylacetamide (DMA) and, 1,1,1,2-tetrafluoroethane + N-methyl-2-pyrrolidone (NMP), using the static–analytic method at temperatures varying between 303 and 353 K. The experimentally measured data were successfully correlated using the Peng–Robinson equation of state (PR-EoS) in combination with Huron–Vidal mixing rule, and the nonrandom two-liquid activity coefficient model (NRTL), contrarily to the predictive Soave–Redlich–Kwong (PSRK) group contribution equation of state which failed to reproduce accurately enough such data.
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