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Thermal displacement ventilation is based on cool air supply at low level and stratification of room air temperature and contaminants due to the natural buoyancy forces created by the heat sources.
The air that rises in the convection currents is replaced at low level by supply air at slightly lower temperature than that of room ambient air. The warm and polluted air stratifies in the upper layer, where it is exhausted.
The advantages of displacement ventilation over totally mixing ventilation system are:
- lower cooling energy and capacity demands to maintain equal thermal conditions in the occupied zone
- a longer period for the use of free cooling
- better air quality in the occupied zone
Displacement systems are a preferable solution in spaces where specific airflow rate per floor area is high eg. lobbies, theatres and conference rooms. It is also used in area where high contaminant loads exist, like in industry and smoking rooms. The benefits of displacement ventilation can be realised optimally in spaces higher than three metres.
The use of custom architectural facades gives the architect the freedom to create a great feature or camouflage the terminals with the existing decor.
The facades must have a minimum uniform free area of 40% and be installed no closer than 50mm from the diffuser face to achieve the same performance.
