Infiltration

The infiltration flow rate, or q_v;10, can be specified for each building module separately. This is possible using multiple input methods and different units:

Heat loss

 HL
If a Building meets Dutch Building Code, the infiltration flow rate is determined for the calculations based on the specified q_v;10 value (if applicable), the ventilation system (housing), and the Building dimensions: Level height of top floor (non-residential). Flow rates are given for buildings with and without openable windows for buildings which do not comply with the Dutch Building Code.

§ Maximum qv; 10 [dm³/(s.m²Ag)] In this case a maximum characteristic air permeability of the building envelope is assumed, used to determine the infiltration flow rate Qi. Please consult Infiltration flow rates for the applied values;

§ Custom qv; 10 [dm³/(s.m²Ag)] In this case the characteristic air permeability of the building envelope is specified, from which the infiltration flow rate Qi is determined;

§ Custom infiltration [Select units *] In this case the infiltration flow rate is specified.

Cooling load

 CL
In general the infiltration is not taken into account in the cooling load calculations. It is also possible to use an infiltration rate of 0.30 in the calculations.

•      No infiltration: no infiltration occurs;

•      Custom infiltration [Select units *]: in this case the infiltration flow rate Qi is specified

Building simulation

 BS
The Building dimensions: Building height, which is to determine the infiltration flow rate, can be specified from Properties> Buildings> General.

§ Custom infiltration (wind-dependent) [Number]: a wind dependent infiltration flow rate Qi is defined. These infiltration flow rate may be specified at wind speed of 0, 3, and 6 m/s.

In the Vabi Elements Library you’ll find some default values for infiltration (1/h (m³/(m³·h))) :

For new buildings most of the time you can use lower values:

EPG

 EPG
The infiltration is partly determined based on the q_v;10 value for the energy performance calculation EPG. The q_v;10 value may be derived from the building properties (template Building requirements), or it may be user-specified based on measurements.

•      Derived from building properties The q_v;10 value is determined based on the implementation variant and building type (see template Building requirements).

•      User-defined qv, 10 A user-defined q_v;10 value in dm³/(s.m²Ag) is specified here. This value should have been determined based on measurements.