Wind Pressure Coefficient Templates

Wind pressure coefficients are used when Natural ventilation model option is set to 'Calculated'.  The EnergyPlus Airflow Network calculations use pressure coefficients when calculating wind-induced pressure on each surface during simulations when the Calculated Natural ventilation option is selected.

DesignBuilder is supplied with a database of wind pressure coefficients based on data from Martin Liddament, Air Infiltration Calculation Techniques, An Applications Guide, AIVC. The Cp data is buildings of 3 storeys or less, with square surfaces and for 3 levels of site exposure. The data is given in 45° increments.

Another source of information on wind pressure coefficients from AIVC is Numerical Data for Air Infiltration & Natural Ventilation Calculations.

Note: The AIVC wind pressure coefficient data provides a good first level of approximation for basic design purposes. However, ideally you would override this default data with pressure coefficient data specific to your application. This data might be calculated from CFD simulations or measured from wind tunnel studies using physical models.

Template data can be accessed:

• from the Templates tab on the opening screen (if no file is open),
• from the Templates tab in the Navigator panel (if a file is open),
• by double-clicking on the template icon in the model data,
• by clicking on the Edit button when selecting templates from a list.