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7.12.1 Inputs at Exhaust Fan Boundaries

You will enter the following information for an exhaust fan boundary:

All values are entered in the Exhaust Fan panel (Figure  7.12.1), which is opened from the Boundary Conditions panel (as described in Section  7.1.4).

The first 4 items listed above are specified in the same way that they are specified at pressure outlet boundaries. See Section  7.8.1 for details. Specification of the pressure jump is described here. Open channel boundary condition inputs are described in Section  23.10.2.



Specifying the Pressure Jump


An exhaust fan is considered to be infinitely thin, and the discontinuous pressure rise across it is specified as a function of the local fluid velocity normal to the fan. You can define a constant, polynomial, piecewise-linear, or piecewise-polynomial function for the Pressure-Jump across the fan. The panels for defining these functions are the same as those used for defining temperature-dependent properties. See Section  8.2 for details.

Figure 7.12.1: The Exhaust Fan Panel
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You must be careful to model the exhaust fan so that a pressure rise occurs for forward flow through the fan. In the case of reversed flow, the fan is treated like an inlet vent with a loss coefficient of unity.


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