What is treated fresh air handling unit?

A treated fresh air handling unit (TFAHU) is a device used in heating, ventilating, and air conditioning (HVAC) systems to condition and distribute fresh air throughout a building. It is designed to provide a controlled supply of clean, tempered air to maintain indoor air quality and thermal comfort.

Key components of a treated fresh air handling unit include:

1. Air Intake: The TFAHU draws fresh air from the outside through an air intake. This air may contain pollutants such as dust, pollen, and other contaminants.

2. Filtration System: The TFAHU contains a filtration system to remove particulate matter, dust, and other contaminants from the incoming fresh air. This can include filters of different grades, such as pre-filters, medium-efficiency filters, and high-efficiency particulate air (HEPA) filters, to achieve the desired level of air cleanliness.

3. Cooling and Heating Coils: The TFAHU may be equipped with cooling and heating coils to regulate the temperature of the incoming fresh air. The cooling coils use chilled water or refrigerant to cool the air, while the heating coils use hot water or steam to heat it.

4. Humidification or Dehumidification System: Depending on the climate and indoor air quality requirements, the TFAHU may also include a humidification or dehumidification system to control the moisture content of the air. Humidification adds moisture to the air, while dehumidification removes excess moisture.

5. Air Distribution System: After the fresh air has been conditioned, it is distributed throughout the building through a system of ducts and vents. This ensures that clean, tempered air reaches all areas of the building.

6. Control System: The TFAHU is typically equipped with a control system that monitors and adjusts its operation to maintain the desired indoor air quality and temperature set points. This control system may be integrated with the building's overall HVAC system for efficient and centralized control.

Overall, a treated fresh air handling unit plays a crucial role in providing a controlled and comfortable indoor environment by ensuring a supply of clean, conditioned fresh air throughout the building.