Modular air handling units (AHUs) integrate multiple functional sections, each with a distinct role, to comprehensively condition and treat indoor air. Below are the key modules and their functions:

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1. Fresh Air Section

  • Function: Introduces fresh outdoor air to maintain indoor air quality and ensure proper ventilation.
  • Features: Equipped with air volume control dampers to regulate fresh air intake as needed.

2. Return Air Section

  • Function: Recirculates a portion of indoor air, improving energy efficiency by reducing the need for excessive fresh air conditioning.
  • Features: Includes adjustable dampers to control return air volume.

3. Mixing Section

  • Function: Blends fresh air with return air in a controlled ratio, optimizing indoor temperature and humidity.
  • Features: Contains separate fresh air and return air inlets with adjustable dampers for flexible airflow regulation.

4. Filtration Section (Primary, Medium, and High-Efficiency Filters)

  • Function: Removes dust, particulates, bacteria, and other impurities, ensuring clean indoor air.
  • Primary filters trap large particles.
  • Medium and high-efficiency filters remove finer contaminants.
  • Features: Filters require regular cleaning or replacement to maintain effectiveness.

5. Heating and Cooling Section (Coil Section)

  • Function: Regulates air temperature by either heating or cooling the airflow.
  • Heating: Uses hot water, steam, or electric heating to raise air temperature.
  • Cooling: Utilizes a refrigerant coil system to lower air temperature.
  • Features: Includes automated controls for precise temperature adjustment.

6. Humidification Section

  • Function: Increases indoor humidity in dry conditions to enhance comfort.
  • Features: Various humidification methods, such as steam, high-pressure mist, or wetted media, can be adjusted based on indoor requirements.

Conclusion

By combining these functional sections, modular AHUs control temperature, humidity, cleanliness, and ventilation, creating a comfortable and healthy indoor environment. Their customizable design makes them a vital component in modern HVAC systems.

Main Modules and Functions of Modular Air Handling Units