Overall assumptions for determining the internal volume of the enclosed space (gross volume) by means of a reduction factor are not permissible. The base area of each room should be multiplied by the average clear height of the room. Vn50 – Net air volume for pressurisation test
Metalfrio vn50 specs manual#
The air volume V v is calculated automatically by PHPP based on the TFA calculation by the user and the entered room height.įor further reference, please see the current PHPP manual (PHPP 9 manual: section 21.2.9). For non-residential buildings, the mean value of all room heights should be entered here. Therefore, for greater room heights in residential buildings it is recommended to not enter a larger value, since this would tend to result in an excessive exchanged air volume and an indoor humidity level during the winter that may be too low.
This is a fixed value since the amount of emissions unrelated to occupants depend on the living space and hardly increase with larger room height. A standard residential room height of 2.5 m is used for simplification purposes. The air volume V v, is the energy reference area (Treated Floor Area, A TFA) multiplied by the room height. For non-residential buildings, the value is merely informative for the calculation of the air exchange rate and does not really influence the calculation of ventilation heat losses. For residential buildings on PHPP, it serves to calculate the ventilation heat losses and is only relevant to determine the minimal air change rate of 0.3 1/h, independent of occupation, necessary to ensure an appropriate air quality.
It is thus rather a reference value than an exact depiction of the volume within the building. This value, is calculated by multiplying the treated floor area by the average room height.
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