How Does an Air Handling Unit Work?

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Working of an Air Handling Unit: What You Need to Know

Construction Tech Review | Monday, January 09, 2023

Air handling units generally comprise large-scale ducts connected over different regions of the buildings, which serve as the pathways to transfer conditioned air to and fro the system.

Fremont, CA: Air handling units are installed in buildings and other structures to ensure the quality of air circulation. These systems monitor and regulate the flow of the air as a part of the ventilation, heating and air conditioning process. Ensuring the air quality index is at acceptable levels is of prime importance as it affects the functioning, productivity and safety of the workforce associated. They are often installed on the floors, roof, and basement of the buildings according to the requirements of the facility.

Significance of Air handling units

Air handling units generally comprise large-scale ducts connected over different regions of the buildings, which serve as the pathways to transfer conditioned air to and fro the system. Supply of fresh air to the rooms and allocated spaces are carried out through the ventilation ducts in the system while returning the air present in the margins and reconditioning it in the filters. The units are generally attached with cooling and heating fans to carry out the energy exchange and conservation between the spaces.

Working units of the AHU systems

Housing

Housing refers to the facility which accommodates the entire components of the AHU and is generally painted to prevent corrosion and rust due to external exposure. The fans and coil unit of the systems are also insulated in order to avoid the corrosion process.

Filters

Filters generally serve the function of removing contaminants and particulates from the air. Several modes of air filters are available in the market, and they are

•  HEPA filters are used in facilities to remove airborne bacteria and germs, which would affect the healthy working style of the employees and are generally implemented in sensitive equipment industries.
•  A medium to high range of filtration is provided by the bag filters.
•  Low levels of filtration are provided by the panel filters.
•  Electrostatic and carbon filters

Fan

Different models of fans available in the unit help in moving the air to various sections of the buildings. Static pressure and air volume of the unit are evaluated and considered while selecting the type of fan.

Mixing box

The air which is to be sent to the building as an ideally treated one is obtained by mixing the outside air and the returned portion within the mixing boxes. Thermal wheels and cross-plate heat exchangers are involved in carrying out the heat exchange between the mediums.

Humidifiers

Use of several types of humidifiers is generally carried out, such as the steam grid, steam pan and spray types, during the winter season when the internal air in the buildings becomes extremely dry and uncomfortable to bear with.

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