Eliminating draughts with smart ventilation


SAV’s AirMaster Smart Ventilation Units (SVUs) incorporate key design features to tackle the common problem of draughts from ventilation systems in classrooms, offices and many other workplaces. These include close control of inlet air temperature and exploitation of the Coanda effect (illustrated on the left) to ensure comfortable conditions in the occupied zone.

As such, they provide simultaneous control of air velocity and incoming air temperature, factors known to create uncomfortable draughts, whilst ensuring effective management of indoor air quality and efficient demand-controlled ventilation - something that traditional ventilation controls are unable to do.

Smart control of inlet temperature by AirMaster SVUs is achieved automatically by using fan differential speed. If the inlet temperature is below the set-point temperature for the space, the inlet fan slows while the exhaust fan speeds up.

This results in a lower flow of cold air being warmed by an increased volume flow of warm air, thus producing an increase of inlet temperature.

If the inlet temperature rises above the set point, the automatic bypass damper opens sufficiently to allow a proportion of air to enter directly from the outside, without passing through the heat exchanger.

In parallel, AirMaster SVUs exploit the Coanda effect to move the supply air across the ceiling for 6-8 metres, thereby entraining room air before the incoming air falls to the occupied zone at low velocity and comfortable temperature conditions.

For more information on this story, click here: May 2018, 168
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