AHU

Definition

An Air Handling Unit (AHU) is a device used in heating, ventilating, and air-conditioning (HVAC) systems to regulate and circulate air. It typically contains components such as fans, heating and cooling elements, filters, dampers, and sound attenuators, which work together to condition and distribute air throughout a building.

Purpose

The primary purpose of an AHU is to ensure the efficient distribution and conditioning of air within a building to maintain a comfortable indoor environment. It plays a critical role in managing air temperature, humidity, and quality, contributing to occupant comfort and health. AHUs are essential in various settings, including commercial buildings, hospitals, schools, and industrial facilities, where controlled air circulation is necessary.

Examples of Use

1. Commercial Buildings: AHUs are used in office buildings to provide heating, cooling, and ventilation, ensuring a comfortable work environment for employees.
2. Hospitals: In healthcare facilities, AHUs are crucial for maintaining sterile and controlled environments, particularly in operating rooms and patient care areas.
3. Educational Institutions: Schools and universities use AHUs to ensure classrooms and common areas have adequate ventilation and temperature control.
4. Industrial Facilities: Factories and production plants employ AHUs to manage indoor air quality, remove contaminants, and maintain optimal working conditions.
5. Residential Buildings: Larger residential complexes may use central AHUs to provide consistent heating, cooling, and ventilation across multiple units.

Related Terms

1. HVAC System: Heating, Ventilation, and Air Conditioning system, of which AHUs are a critical component.
2. Chiller: A machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle, often used in conjunction with AHUs to cool air.
3. Boiler: A device that heats water to produce steam or hot water for heating purposes, used alongside AHUs to provide warm air.
4. Ventilation: The process of exchanging or replacing air in any space to control temperature, remove moisture, odors, smoke, heat, dust, airborne bacteria, and carbon dioxide, and replenish oxygen.
5. Ductwork: A system of ducts used to transport air from AHUs throughout a building.

Notes

• AHUs can vary significantly in size and complexity, from small, simple units to large, multi-component systems.
• The efficiency and performance of an AHU depend on proper maintenance, including regular filter changes and system inspections.
• AHUs can be integrated with building automation systems (BAS) to enhance control and efficiency.
• Depending on the design, AHUs can handle both outdoor air (bringing fresh air into the building) and recirculated indoor air.
• AHUs often include various air filters to improve indoor air quality by removing dust, allergens, and other contaminants.