WHAT IS PAU ?

11:59 09/04/2025 14 views

1. What is PAU (Primary Air Unit)?

PAU (Primary Air Unit) is an important device for processing and supplying fresh air in HVAC systems (Heating, Ventilation, and Air Conditioning). Its main function is to provide clean fresh air, ensuring air quality for areas that require clean environments, especially in cleanrooms, manufacturing plants, hospitals, and commercial buildings.

The PAU system ensures that the air supplied to these spaces is filtered to remove dust, bacteria, and pollutants. This is especially important for industries requiring strictly controlled environments.

2. Components of a PAU

The PAU system typically consists of the following main components:

  • Fan: Supports the circulation of fresh air.
  • Air filter: Removes dust, bacteria, and harmful impurities.
  • Heat exchanger coil: Can be combined with a cooling system to control temperature and humidity.
  • Automatic controller: Helps regulate airflow and maintain stable air quality.
  • Heater: Used when it is necessary to increase the air temperature to suit environmental conditions.
  • Air ducts and damper system: Ensures even air distribution and optimizes airflow.

3. Operating Principle of PAU

The PAU system operates on the principle of supplying fresh air from the outside environment, then filtering and adjusting the temperature and humidity before delivering it to the utilized spaces. PAU can operate independently or in combination with AHU (Air Handling Unit) to optimize the air treatment system.

PAU operation modes:

  1. Direct fresh air supply: PAU draws fresh air from the outside, passes it through filters, and delivers it to the usage space.
  2. Combined with AHU: PAU pre-processes the air before sending it to the AHU for temperature and humidity adjustment.
  3. Pre-cooling: In some applications, PAU can be integrated with a cooling system to lower the temperature of the fresh air before supplying it indoors.
  4. Air pressure adjustment: PAU helps maintain proper pressure to limit dust intrusion into protected areas.

PAU Air Handling Equipment

4. Real-World Applications of PAU

The PAU system plays a vital role in many fields, especially in:

4.1. Cleanrooms and Manufacturing Plants

  • Ensures clean air supply in accordance with ISO 14644-1 standards.
  • Controls fine dust and bacterial levels in pharmaceutical, food, and electronics manufacturing environments.
  • Creates positive pressure in cleanrooms to prevent dust and bacteria from entering from outside.

4.2. Hospitals and Laboratories

  • PAU helps maintain a sterile environment and prevent cross-contamination.
  • Supports humidity and temperature control to protect sensitive medical equipment.
  • Ensures a continuous supply of clean air, keeping operating rooms and treatment areas sterile.

4.3. Commercial Buildings and Offices

  • Provides the necessary amount of fresh air, reduces CO2 and other pollutants.
  • Enhances HVAC system efficiency, improving workplace environmental quality.
  • Reduces the risk of illnesses caused by indoor air pollution.

4.4. Application in Electronic Component Manufacturing Plants

  • Humidity control is needed to avoid static electricity that could affect electronic circuits.
  • Maintains a clean, dust-free environment to ensure product quality.

5. Benefits of Using PAU

Using a Primary Air Unit (PAU) system brings many outstanding benefits:

  • Improved air quality: Removes dust, bacteria, and reduces the risk of indoor air pollution.
  • Energy savings: When combined with HVAC systems, PAU helps optimize energy consumption.
  • Extended equipment lifespan: Reduces load on AHU and chillers, allowing for more durable system operation.
  • Stable humidity and temperature maintenance: Meets strict environmental control requirements in specialized industries.
  • Reduced maintenance costs: PAU lightens the load on central air systems, thereby decreasing breakdowns and maintenance expenses.

6. Conclusion

PAU (Primary Air Unit) is a crucial component in HVAC systems, ensuring the supply of clean fresh air for various sectors. With effective air filtration, energy efficiency, and air quality improvement, PAU is increasingly being applied in cleanrooms, hospitals, factories, and commercial buildings.

If you need consultation on a PAU system tailored to your needs, contact Durate Vietnam now for the most optimal solution!

DURATE VIETNAM CO., LTD
Hotline: 0971.722.247
Email: info@durate.com.vn
Website: durate.com.vn
Factory: No. 22 Phuc Hau, Quan Am Hamlet, Bac Hong Commune, Dong Anh, Hanoi.

 

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