Configure the equilibrium options for a Fluid Type that uses the Regular Solution Model method

The Equilibrium Options section in the Fluid Editor provides a set of advanced equilibrium options that allow you to adjust your equilibrium calculations to suit your needs. The equilibrium options that are available depend on the type of thermodynamic method that you use as the System method for your Fluid Type.

While the Regular Solution Model method is a liquid activity coefficient (LACT) method, it represents a more idealized approach to the equilibrium calculations compared to the other LACT methods. As a result, there are a limited number of options that you can use to adjust the equilibrium calculations. Therefore, we document the equilibrium options for the Regular Solution Model method separately from the other LACT methods available in AVEVA Process Simulation.

Configure the equilibrium options

1. Open the Fluid Type in the Fluid Editor if the Fluid Type is not already open.

2. Expand the Equilibrium Options section if it is not already visible.

   

3. (Optional) Select the Use Poynting Correction checkbox to include the Poynting correction factor in the equilibrium calculations.

   The Poynting correction always uses the pure component volume data calculated from the temperature-dependent property correlations for liquid density, as defined in the PURECOMP data bank from the thermodynamic library used by the Fluid Type and the local thermodynamic data overrides specified on the Temp Dep tab in the Component Data section of the Fluid Editor. See Effects of specifying thermodynamic method overrides for more information.

4. (Optional) Select the Include Fugacity Coefficient Variables in Fluid State checkbox to add variables for the fugacity coefficients to the Fluid State model.

   You can now view the calculated values for the fugacity coefficients or use them in other areas of the simulation.