AHU(Air Handling Unit)
An air handling unit (AHU) is a device used in HVAC (Heating, Ventilation, and Air Conditioning) systems to circulate and condition air in a building or a controlled environment. It consists of several components working together to regulate temperature, humidity, and air quality. Here’s an overview of the main components and functions of an AHU:
Fan: The fan is the primary component responsible for moving air through the AHU. It draws air from the space or from outside, then pushes it through the unit’s components for conditioning and distribution.
Filters: Filters are installed in the AHU to remove dust, dirt, pollen, and other airborne particles from the incoming air. They help improve indoor air quality and protect the other components of the HVAC system.
Heating and Cooling Coils: Heating and cooling coils are used to adjust the temperature of the air as required by the building’s occupants. Heating coils (typically containing hot water or steam) increase the air temperature, while cooling coils (containing chilled water or refrigerant) lower the air temperature.
Humidifiers and Dehumidifiers: Humidifiers add moisture to the air when it’s too dry, while dehumidifiers remove excess moisture when it’s too humid. These components help maintain comfortable humidity levels in the building.
Mixing Dampers: Mixing dampers control the flow of outside air and recirculated air into the AHU. They regulate the ratio of fresh air to recirculated air based on indoor air quality requirements, energy efficiency goals, and building occupancy.
Return and Supply Air Ducts: Return ducts carry air from the building back to the AHU for conditioning, while supply ducts distribute conditioned air from the AHU to various zones or rooms within the building.
Controls and Sensors: AHUs are equipped with sensors and controllers to monitor and regulate air temperature, humidity, pressure, and other parameters. These controls ensure that the AHU operates efficiently and maintains desired environmental conditions.
Sound Attenuators: Sound attenuators or silencers may be installed in the AHU to reduce noise generated by the fan and airflow, ensuring quiet operation in occupied spaces.
Access Panels and Insulation: Access panels are provided for maintenance and servicing of internal components. Additionally, AHUs are often insulated to prevent heat loss or gain and to minimize condensation on surfaces.
AHUs come in various sizes and configurations to suit different building types and HVAC system designs. They are commonly used in commercial buildings, industrial facilities, hospitals, hotels, and other large structures where centralized air distribution and conditioning are required.
