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Figure 25 Plant Parameters tab in the Unit Data window
The Unit Data window has an extra tab for entering the parameters in the model, which
are associated with that particular unit. Let us enter the parameter for the cross heat exchanger.
Double click on the unit to open the Unit Data window. In the Unit Data window, click on the
‘Plant Params’ tab. Then, click on the ‘Add’ button. The parameter name and the initial point
are required. Enter ‘uE100’ as the parameter name. This is the overall heat transfer coefficient
of the exchanger. The bounds, description and the unit of the parameter are optional. The Unit
Data window with the parameter information is shown in Figure 25.
A. Global Data
If there are variables, parameters and equations that do not belong to either a unit or a
stream, then they can be entered in the Global Data window. This includes the economic model
and the equations to evaluate emissions and energy use. To enter this global data, double click on
the background of the flowsheet diagram or click on the ‘Global Data’ option in the Model
menu.
The Global Data window in Figure 26-a shows the equality constraints in the Global
Data section for the aniline process model . There are no equality constraints in the Global Data
section for an aniline process so the window in Figure 26.a shows empty in the equality
constraint section .
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