Can FFU replace fresh air air conditioners? The difference between circulating filtration, temperature and humidity and air supply tasks
FFU and fresh air air conditioners have different tasks
In clean room projects, it is sometimes discussed whether FFU can replace fresh air air conditioners. The core of this problem is to distinguish the tasks undertaken by the two devices.
The main task of FFU is to circulate, filter and supply air. It sucks air from the return air or mezzanine, filters it and sends it to the clean area to maintain cleanliness and air flow organization. The main task of the fresh air air conditioner is to process fresh air, including filtering, heating, cooling, humidification or dehumidification, and to supplement the amount of fresh air required in the room.
The two tasks are different. FFU cannot replace fresh air air conditioners alone, because FFU usually does not handle the fresh air load, does not control temperature and humidity, and does not bear the responsibility of system supplementary air. Clean areas also need to design air treatment systems based on personnel, process exhaust and heat and moisture loads.
Therefore, FFU and fresh air air conditioners should work together instead of replacing each other. Aili Industrial has complete production capabilities in FFU complete machines and clean engineering supporting equipment, and can provide air supply solutions according to project needs. For the basic structure of the FFU machine, please refer toAili Industrial FFU fan filter unit。
What tasks does FFU undertake?
FFU is responsible for the task of circulating filtered air supply. It provides clean air and maintains room air exchange rate or one-way flow speed. FFU can be combined with multiple units to form a large air supply surface. It is suitable for clean room circulating air systems, and is also suitable for supporting local clean areas and equipment.
FFU usually does not introduce fresh air, nor does it deal with the temperature and humidity of the fresh air. Its air intake comes from room return air, interlayer air or air inside the equipment. The air volume and static pressure of the FFU need to match the system resistance.
What tasks does the fresh air air conditioner undertake?
Fresh air air conditioners are responsible for fresh air processing tasks. Fresh air needs to be filtered, heated, cooled, humidified or dehumidified to meet the humidity requirements of clean room temperature. Fresh air is also used to maintain positive pressure in the room and supplement the exhaust air volume.
The processing capacity of fresh air air conditioners needs to be determined based on the climate of the project location, room heat and moisture load, and exhaust volume. In humid areas, dehumidification capabilities are particularly important. In cold areas, heating and antifreeze require attention.
Who is responsible for temperature and humidity control?
Temperature and humidity control is usually undertaken by fresh air air conditioners, cooling coils or other air handling equipment. FFU does not directly control temperature or humidity. If the project has requirements for temperature and humidity, corresponding processing equipment needs to be configured.
The air supply volume and airflow organization of FFU can affect the temperature and humidity distribution, but cannot replace the cooling, heating or dehumidification capabilities. For clean rooms with high temperature and humidity requirements, it is recommended to design FFU and fresh air air conditioners as a system.
Who is responsible for the air supply and pressure difference?
Room positive pressure and makeup air are usually responsible for the fresh air system. FFU provides circulating air without increasing the net fresh air volume in the room. If the room has process exhaust or personnel needs, fresh air needs to be supplemented.
If only FFU is installed without fresh air, the room may not be able to maintain positive pressure, and outside air may enter through the doors and windows. Therefore, FFU cannot replace the function of fresh air and supplementary air.
How systems work together
FFU, fresh air air conditioners, cooling coils and exhaust systems need to work together. The fresh air air conditioner handles the fresh air load, the FFU provides circulating filtered air supply, the cooling coil handles indoor sensible heat, and the exhaust system discharges process waste gas. The air volume and processing capacity of each system need to be balanced.
For clean room projects, it is recommended to clarify the tasks and interface conditions of each equipment during the system design stage. The air volume, static pressure and control method of FFU should be coordinated with the fresh air, return air and exhaust systems.
If the project needs to deal with both particulate and chemical pollution, you can refer toChemical Filters and AMC Molecular Contamination Control Learn about chemical filtration options.
Issues that should be confirmed in advance during project communication
In the design stage of FFU and fresh air air conditioning systems, it is recommended to confirm the following with the designer and FFU manufacturer: room fresh air volume requirements; temperature and humidity requirements; heat and moisture load; process exhaust volume; room pressure difference; FFU air supply volume and static pressure; fresh air air conditioning processing capacity; interfaces and collaboration methods of each system; control and monitoring requirements.
If you are planning a cleanroom air handling system, visitAili Industrial FFU fan filter unit to learn about the complete machine configuration, you can also refer toHow does FFU, MAU, and DCC divide labor (Note: This link is an example of the FFU product page. Please refer to the corresponding page on the site for specific system division of labor) to learn about system collaboration, or contact Aili Industrial for engineering support.
in conclusion
FFU is mainly responsible for the task of filtering air supply, and usually cannot replace fresh air, temperature and humidity treatment and system supplementary air alone. The fresh air air conditioner is responsible for fresh air treatment, temperature and humidity control and room air supply. Clean areas need to design air treatment systems based on personnel, process exhaust and heat and moisture loads. FFU and fresh air air conditioners should work together.
Aili Industrial has complete production capabilities in FFU complete machines and clean engineering supporting equipment, and can provide air supply solutions according to project needs. If you need to know more about the division of labor in the FFU system, you can visitAili Industrial FFU fan filter unit , you are also welcome to contact Aili Industrial for project support.
