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7.7.1 Inputs at Intake Fan Boundaries

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

All values are entered in the Intake Fan panel (shown in Figure  7.7.1), which is opened from the Boundary Conditions panel (as described in Section  7.1.4).

The first 11 items listed above are specified in the same way that they are specified at pressure inlet boundaries. See Section  7.3.1 for details. Specification of the pressure jump is described here. Open channel boundary condition inputs are described in Section  23.10.2.

Figure 7.7.1: The Intake Fan Panel

Specifying the Pressure Jump

An intake fan is considered to be infinitely thin, and the discontinuous pressure rise across it is specified as a function of the velocity through the fan. In the case of reversed flow, the fan is treated like an outlet vent with a loss coefficient of unity.

You can define the Pressure-Jump across the fan as a constant, polynomial, piecewise-linear, or piecewise-polynomial function of the normal velocity. The panels for defining these functions are the same as those used for defining temperature-dependent properties. See Section  8.2 for details.

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