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Infiltration

 Go to the Infiltration form

👉  In case of ‘Wind driven flow’ (wind dependent infiltration), open the table for pressure coefficients.

👉  Alternatively, you can open the table for pressure coefficients directly in the General tab

👉  Choose ‘Auto fill’

👉  Select ‘Semi exposed’

Note: Whenever you wish to calculate the wind driven infiltration flow, you need to define both the complete internal leakage paths between the zones and the wind pressure coefficients for all external faces.

👉  Alternatively, you can fill in wind pressure coefficients, e.g. results from CFD calculation or wind tunnel measurements. Note that Copy and Paste of rectangular sections of a table, from e.g. Excel, may be used here.

 Here, we will not use pressure coefficient based infiltration but ‘Fixed infiltration’. The infiltration will then be constant and not wind dependent.

👉  You can change the units for the definition of the infiltration flow

 Set fixed infiltration flow to 0.3 ACH (air changes per hour)

👉  You can choose, whether the air tightness and fixed infiltration flow respectively is distributed proportional to (a) the zone volume, (b) the external surface area of the zone or (c) the zone floor area.

👉  See calculated fixed flows in zones, depending on the settings at ˆ-Š.

 Close the Infiltration form

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