Distributed air-conditioning purification system usually refers to the air-conditioning purification system that combines heat and humidity treatment equipment with coarse, medium and high efficiency filters in a box and distributes in the clean room or adjacent rooms and corridors. Sometimes the air conditioning unit has only coarse efficiency and medium efficiency filtering, but the residual pressure of the unit is large, which overcomes the resistance of the high efficiency air filter exported. In addition, it is equipped with local purification equipment such as assembled clean rooms (clean workbench, clean shed, self-cleaning device), general cabinet, box and wall-mounted small air conditioning systems. Decentralized general costs are lower, changes are more flexible, and transformation projects are more suitable for use. The GMP implementation guidelines have the following provisions. 220.127.116.11 "Centralized air purification system should be used in large area, high cleanroom, centralized location, noise elimination and vibration control requirements of clean rooms, and vice versa."
When equipped with cooling, dehumidifying, heating and humidifying equipment and coarse, medium and high filters, the purifying air conditioning unit can be set in the clean room outdoor or adjacent walkways. Connect the air outlet pipe to the side wall or ceiling of the clean room, and supply air to the clean room with a net shed or other diffuser. The air returned from the lower side wall to the outdoor or corridor is mixed with fresh air filtered roughly and inhaled to purify the air conditioning unit. Fresh air shall be supplied by fresh air units with small fans and filters to ensure positive pressure between the exterior or or corridor and the exterior.
Another case is that the purifying air conditioning unit has only coarse and medium filtration, but there is enough residual pressure to overcome the ultimate HEPA resistance and pipeline resistance. At this time, HEPA can be located at the outlet at the end of the air supply pipeline, which is more conducive to ensuring the cleanliness of the air into the clean room.
Special purification air-conditioning units in China do not have fixed products, most of which are purchased by compressors, evaporators, condensers and other spare parts by air-conditioning purification plant production plants, plus air pressure and higher fans of greater air volume and filters at all levels, and the body of the box redesigned and processed. Air conditioning is selected according to the cooling and heating load of the clean room. Another booster fan box with medium filtration is connected in series with the air conditioning unit. Most of the return air is connected with the booster fan box for recovery. A small amount of return air is returned to the air conditioning unit, and fresh air is used for heat and humidity treatment. The outlet pipe of supercharged fan box conveys air to the air outlet of high efficiency filter on the roof of clean room. It has been used in many small and medium-sized pharmaceutical factories in Hebei, Shandong, Anhui, Hubei, Beijing and Tianjin.
One method is to use with the fan-high efficiency filter unit. In our country, there are few fixed products for the inlet of fan high efficiency filter. Its properties are consistent with the illustrations given. This method was used in the preparation workshop of a Medical University in Wuhan.
The other is a horizontal one-way flow clean room composed of air conditioning units, booster fans and medium and high efficiency filters. The (+0.1 C) and M3.5 grade constant temperature and humidity clean rooms of an electronic research institute in Shijiazhuang, which Tianjin University undertakes, are realized in these forms.
Centralized air conditioning, decentralized purification
When the original central air-conditioning room needs to be cleaned, or considering the reasons of noise and vibration, the air-conditioning purification mode combined with the centralized air-conditioning system adopts decentralized purification equipment, which also has the characteristics of flexible use and convenient conversion. In order to meet the needs of bio-clean operating rooms and wards in two hospitals in Shenzhen, self-cleaning operating rooms were adopted in the design of operating rooms. Four kinds of cleaning benches (a), self-cleaning machines (b, c) and high-efficiency filter fans (d) on air-conditioning feeder branches are given respectively.
For places requiring high level of cleanliness in indoor parts, clean rooms or shed can be set up. In the preparation room of a traditional Chinese medicine hospital in Shenzhen, the author used the one-way cleaning shed as a local Purification Measure for many times, and achieved satisfactory practical results.
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