Test model for the variable air volume flow box. The model has two flow legs, both are connected to models for constant inlet and outlet pressures. The top flow leg has a flow resistance and an air damper, and the bottom flow leg combines both of these resistances into one model. Both flow legs have identical mass flow rates, except at very small flow rates. The reason for this difference is that the equations are regularized for numerical reasons, and combining the two components within one component leads to a slightly different equation for the regularization.
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