LK — Lee-Kesler equation of state

The Lee-Kesler (LK) equation of state improves on the Curl-Pitzer (CP) method, which works on the principle of three-parameter corresponding states to predict the compressibility factor and other derived thermodynamic functions at constant reduced temperature, Tr, and constant reduced pressure, Pr.

In 1975, Lee and Kesler[1] pointed out that the CP method[2] is limited to Tr > 0.8 and that there are significant discrepancies near Tr = 0.8. To overcome these limitations, Lee and Kesler developed an analytical correlation as a function of the reduced temperature (Tr), the reduced pressure (Pr), and the acentric factor (w).

Currently, you cannot select this method as an independent system calculation method. However, you can select it as a liquid enthalpy calculation method and a vapor enthalpy calculation method for certain fluids. See Liquid enthalpy calculation methods and Vapor enthalpy calculation methods for more information.