Air Handling Unit
Air Handling unit or AHU is an assembly of air conditioning components
(such as fans, cooling coils, filters, humidifiers and dampers) integrated into a self-contained package and often installed as a single unit, which is connected to system of metal duct work that distributes the conditioned air. It pumps the designed quantity of dehumidified air to respective areas by means of ducting. In most cases the AHU’S cooling and heating functions are not supported by the AHU itself, but by separate heating and cooling generators. The consequences for the AHU of the integration of heating of heating or cooling coil is an increase in the fan energy consumption. The interaction between ventilation and heating/cooling system is limited. Most of the space cooling (and air heating in today’s modern building is done by water based centralized system (by chillers for cooling, and boilers for heating)
The AHU provide pre cooling (pre heating) of the ventilation air and thus take care of only a relative small part of the cooling (heating) load. In addition the energy for pre cooling (pre heating) does not come from the AHU
itself, but is provided by an external source, such as a chiller (boiler or furnace)
Basic Air handling unit consists of;
1)
A section with centrifugal fan and motor
2)
Coil section with coil.
3)
Filter section with filters.
The following figures illustrate the working of an AHU unit.
Diagrams :
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