Building ventilation systems have to perform several different tasks: ensuring the health of the occupants, i.e. by supplying sufficient high-quality air, guaranteeing thermal comfort, and protecting the building, i.e. by removing humidity. That is why the standard distinguishes between a person-related air volume and a building-related air volume.
If rooms are not full during actual use (as assumed during the dimensioning of the central air-conditioning unit), then too much air will continuously be introduced into the room. If one considers that occupancy levels of 80% are far from infrequent, with individuals absent during breaks or periods of leave, and that the required fan capacity is a cubic function of the volume flow, then it is easy to see how great the potential savings are.
However, these savings cannot be achieved unless the ventilation products can be used across a wide volume flow range, e.g.:
- Linear diffusers that can be operated at significantly low temperatures even with low air volumes
- Induction units whose induction ratios do not collapse at partial load
- Volume flow controls that can also handle small air volumes reliably
On-demand ventilation can be implemented directly if the outside air for any individual room is provided via a decentralised ventilation unit.
- Decentralised ventilation units that are activated automatically depending on use.
LTG products for demand-controlled ventilation: