Viscosity prediction of refrigerants under subcritical/supercritical conditions

Viscosity is an important thermophysical property of fluids. Viscosities of refrigerants were predicted based on friction theory combined with the Lemmon and Span short reference equation of state. This model is valid for the temperature up to 397 K and pressure up to 40 MPa, which cover both the subcritical and supercritical regions. Experimental data were further used to validate the model. Under all test conditions, the accuracy is better than 6%, which is acceptable in most practical applications.