Right-click the thermodynamic system node for the thermodynamic system that you want to export (Figure 2-8) and select Export Thermodynamic System. Use the Select File window to store the thermodynamic system.

Right-click the Thermodynamics node and select Import Thermodynamic System (Figure 2-2). Use the Select File window to navigate to a thermodynamic system file and click Open.

It is possible to manually modify the species properties, such as parameters and temperature-dependent functions, in the created Thermodynamic System by using Export Thermodynamic System and Import Thermodynamic System. In the saved xml file from Export thermodynamic system, there are all parameters and temperature-dependent properties for species, which are saved inside a <Compound CompID="name"></Compound> block. For example, to edit the acentric factor of methane from 0.01141 to 0.2 perform the following steps

Here Tlb and Tub defines the lower and upper bound for a temperature range, and a1 to a4 are the corresponding coefficients for a cubic polynomial as f(T) = a0 + a1T+ a2T2+ a3T3 fitted for that range. Multiple sequential ranges can be added by appending temperature ranges and coefficient sets. The <Data></Data> block can be used to input data points directly.