GPS-X Technical Reference

Other Models 326
After choosing the correlation type, the user specifies what variable is the independent
variable (either influent flow, influent concentration or both). Finally, the user must
supply the parameters in the regression equation. Equation 11.18 and Equation 11.19
are typical regression equations that can be set up using the Black Box object.
One independent variables (solids), with proportional regression
Equation 11.18
Two independent variables (flow and concentration), with linear regression
Equation 11.19
Pipe Model
The pipe model can be used to simulate the lag effect caused by significant residence
times in pipes or channels between unit process objects. By default, GPS-X does not
simulate any travel time between objects.
The pipe model is a plug-flow tank model without any biological reactions.
Interchange Model
The pipe model can be used to simulate the lag effect caused by significant residence
times in pipes or channels between unit process objects. By default, GPS-X does not
simulate any travel time between objects.
The pipe model is a plug-flow tank model without any biological reactions.
There are two options available to specify the state variable mapping: From menu, and
From custom macro:
From menu: Menu is used to specify the outgoing state variable for each
incoming state variable (see Figure 11-19).
From custom macro: State variable mapping is specified in the custom macro
file in the interchange model file (accessible by selecting the interchange model
twice). More advanced mapping calculations can be performed in the custom
macro (see Figure 11-20). For details on how to write custom calculations, see
the Customizing GPS-X chapter in the User’s Guide.
GPS-X Technical Reference