The main function of an Air Handling Unit (AHU) is to provide conditioned and ventilated air throughout a building. This involves several key tasks:

1. Air Intake and Mixing: The AHU draws in outside air, which may be mixed with a portion of recirculated air from indoors. This mixing allows for some control over temperature and helps to maintain positive air pressure within the building.

2. Air Filtration: The AHU cleans the incoming air by removing dust, allergens, and other contaminants through filters. This filtration improves indoor air quality and protects the HVAC equipment from airborne debris.

3. Temperature Control: The AHU can adjust the air temperature to meet desired comfort levels. It can achieve this through various methods, such as:

   • Chilled Water Coils: Cold water from a chiller system removes heat from the air.
   • Direct Expansion Coils: Similar to a window AC unit, these coils use refrigerant to cool the air.

4. In some AHUs, Humidity Control:  some AHUs can also manage humidity levels. This may involve:

   • Humidification: Adding moisture to dry air during winter
   • Dehumidification: Removing excess moisture from humid air during summer

5. Air Distribution: Once conditioned, the AHU uses fans to force the treated air through a network of ducts to various rooms in the building.

By performing these functions, AHUs create and maintain a comfortable and healthy indoor environment within large buildings like offices, hospitals, and schools. They offer more precise control over temperature, air quality, and ventilation compared to residential HVAC systems.

Air Handling Unit(AHU)

In summary, the core function of an AHU is to manage the air within a building by providing ventilation, filtration, temperature control, and sometimes humidity control, creating a comfortable and healthy indoor environment.

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