Override the binary interaction data for a Wilson-based Fluid Type

The Wilson tab in the Method Data section contains a component grid for every possible binary pair in the Fluid Type. Each binary pair has a cell that indicates the status of the binary interaction data:

• If the cell is blank, there is currently no data for the binary pair.

• If the cell has a green badge, the binary interaction data is available and comes from the default or custom data banks.

• If the cell has a function icon , the binary interaction data comes from the default or custom data banks, but the value is calculated from a correlation.

• If the cell has a blue badge, the binary interaction data is available and comes from the user-specified (that is, locally overridden) data values on the Wilson tab.

Override the thermodynamic data for a Wilson-based Fluid Type

1. In the Fluid Editor, expand the Method Data section, and then select the Wilson tab.

2. In the component grid, select the cells for the binary pairs whose binary interaction data you want to change.

   The binary interaction data for those binary pairs appears in the table on the Wilson tab.

3. In the table, change the binary interaction parameters as desired.

   See the equations preceding the table if you have questions on how the software uses each binary interaction parameter in the method calculations.

   A blue badge appears in the component grid for each binary pair whose data you modify.

   Important: The software always uses the 12-parameter Wilson equations for the Wilson method calculations. If the binary pair uses data from a WILSON data bank configured with the two-parameter Wilson format in TDM, you must change the sign of the aij and aji parameters. See Wilson method and the AVEVA Thermodynamic Data Manager User Guide for more information on the differences between the 12-parameter Wilson equations and the two-parameter Wilson equations.