A simplified modification of the crossover statistical associating fluid th
eory (SAFT) EOS is used to describe thermodynamic properties of pure fluids
and binary mixtures over a wide range of parameters of state including the
nearest vicinity of the critical point. For pure fluids, the simplified cr
ossover (SCR) SAFT model contains only three adjustable parameters but allo
ws an accurate prediction of the critical parameters of pure fluids and yie
lds a better representation of the thermodynamic properties of pure fluids
than the original SAFT equation of state. For binary mixtures, simple mixin
g rules with only one adjustable parameter are used. A comparison is made w
ith experimental data for pure refrigerants R12, R22, R32, R125, R134a, R14
3a, and mixtures R22 + R12, R32 + R134a and R125 + R32 in the one- and two-
phase regions. The SCR SAFT EOS reproduces the saturated pressure data with
an average absolute deviation (AAD) of about 1.1% and the saturated liquid
densities with an AAD of about 0.9%. In the one-phase region, the SCR SAFT
equation represents the experimental values of pressure with an AAD of abo
ut. 2.2% in the range of temperatures and density bounded by T greater than
or equal to T-c and rho less than or equal to 2 rho (c). (C) 2000 Elsevier
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