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Displacement Ventilation

Passive thermal displacement ventilation

Displacement ventilation uses stratification to its advantage. Cool air is introduced at low level, and warm air is allowed to stratify at the ceiling. For this reason, displacement ventilation is usually employed in spaces above 3m high.

As the air is supplied very close to the occupants, temperatures are kept higher to avoid occupants near the diffusers getting cold. These larger air volumes can bring their own problems though. The air must be introduced very slowly into the space to minimise both noise and draft. If using a metal system, this means making thousands of small perforation in steel plate, this is a very expensive process, and explains why conventional displacement solutions can be expensive. Textile diffusers deliver air through their entire surface for ultimate low velocity.

All low impulse systems act as displacement diffusers and can achieve the same effect when fitted at high level, as the supply air does not mix with the room air.

Vertical textile displacement diffusers are often supplied in 2-3m lengths, these are clamped to a steel supply duct and hang down freely. The diffusers are impact resistant and can be temporarily removed if access is required.

If heating is required, or a larger area needs to be covered by a single diffuser, nozzles can be added to the surface of the duct to facilitate this.

Laboratory test data is available to show velocity at varying heights at a number of distances from the duct.

This solution has been accepted by many blue-chip companies such as Rolls Royce, Vodafone, Pepsico and Nestle.

Please contact us for more information about displacement ventilation


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