Air volume determination by means of air exchange rates
To determine the amount of air needed for the ventilation of a room, certain factors are used. First of all, the type and destination of a room is important. For example, a paint room will require a higher volume of air than a bathroom. The following information should help you find the right amount of air for your ventilation problem.
The volume:
The basis for determining the correct amount of air is the volume of the room, which is calculated according to the formula length x width x height (m)
The next factor is the use of the room. The LWR (hourly LairWchangeRate - how many times the room air is exchanged in an hour) can be taken as a recommendation from the table below and is used in the formula below:
An example:
A bathroom 2m x 3m x 2.5m high is to be deflüfied. For bathrooms an air exchange rate of 5-7 is recommended. Since it is a 2-person household and therefore not expected to shower too frequently, an air exchange rate of 5 can be assumed. This means that the calculated room volume is multiplied by the assumed LWR of 5. The required volume flow rate is thus 75 m3/h.
Air exchange rates:
- For Räumen with *ex, the use of Ex-protected fans is to be proof.
Air exchange rates:
Sources/Standards: 1) empirical values, 2) DIN EN 16798, 3) VDI 2082, 4) DIN 18017, 5) ASR, 6) VDI 2089, 7) VDI 2052, 8) VDI 2051, 9) DIN EN 19779, 10) VDI 2053