A New Generalized Four-Parameter Corresponding-States Method for Predicting Volumetric Behavior of Working Fluids

A new four-parameter corresponding-states method is preseInted to correlate the generalized volumetric behavior of polar and nonpolar working fluids. It is different from other corresponding-states methods in that the acentric factor is not used, instead the normal boiling temperature and critical compressibility factor are introduced as basic parameters. Comparison between experimental and calculated volumetric properties shows that highly accurate results are obtained by the new method for 18 polar and nonpolar working fluids with 3900 experimental data. The overall average absolute error for all of the fluids studied is about 0.8%.