Views: 0 Author: Site Editor Publish Time: 2025-05-08 Origin: Site
General air conditioning system focuses on temperature, humidity, fresh air volume and noise control, while the Air Handling Unit System focuses on the dust content of the indoor air (such as microelectronics clean room), bacterial content (such as pharmaceutical clean room), air speed and the number of air changes. Compared with the general air conditioning system, Air Handling Unit for the room temperature, humidity control is also more stringent.
General air conditioning system in most cases only a filter, that is, for the primary filtration (also known as coarse-effect), the environmental requirements of the top of the additional secondary filtration, filtration. Air Handling Unit must have a primary, medium and high efficiency three filtration, necessary moment will be designed sub-high efficiency filters.
In addition, sometimes in order to eliminate indoor exhaust air pollution of the atmosphere, sometimes additional exhaust air filtration and exhaust gas treatment devices, so that it meets the appropriate emission standards.
General air-conditioning system on the indoor pressure requirements are not strict, there are few cases of high positive or high negative pressure. And AHU Unit in order to avoid outside contaminated air infiltration, or internal contaminated air overflow, or to eliminate the mutual influence of different substances in different clean rooms, for different clean rooms have different requirements for the pressure difference.
Air Handing Unit System than the general air-conditioning system for airtightness, permeability requirements to be much more stringent, the means of detection, the standard of each process have strict measures and testing requirements.
Thus, in order to better ensure the environment related to clean room, clean room building maintenance structure airtightness will be much higher than ordinary air-conditioned rooms.
General air-conditioning system more than the number of low air exchange, high turbulence degree of airflow organisation, through the indoor formation of strong secondary induced airflow or vortex, to reach the temperature and humidity control of indoor air, almost no consideration of the handling of dust particles.
Air Handling Unit system is completely different from the general air conditioning system, AHU in order to ensure that to achieve the required cleanliness, must try to limit and reduce the diffusion of dust particles flying, through the reduction of the secondary reflux and vortex, so that dust particles are quickly discharged outdoors. This is the core of the Air Handling Unit System.
Therefore, the general air-conditioning system mostly adopts the top-feeding and top-returning air supply and return methods, while the Cleanroom Air Handling Unit system mostly adopts the top-feeding and bottom-returning, top-feeding and floor-returning air supply and return methods.
