How to maintain positive pressure in clean room

The change of outdoor wind pressure and wind speed will cause the change of the pressure difference between the clean room and the outdoor. Coastal cities and cities with high wind speed must conduct a review and calculation of the oncoming wind speed and pressure, and adjust the pressure difference value. During the operation of the air-conditioning system over time, the resistance of the system will change, mainly due to the change in the resistance of the filter, which causes the change of the air supply and affects the establishment of the pressure difference in the clean room, because the air-conditioning system runs for a certain period of time. When the resistance changes to a certain value, the system resistance increases, which affects the reduction of the total air supply volume. The actual air supply volume is less than the set air supply volume, and the establishment of the original indoor pressure difference cannot be guaranteed. At the same time, due to the flow of people in the clean room, the doors and windows in the clean room are frequently opened and opened, the original sealing performance of the clean room is reduced, and serious air leakage will eventually affect the establishment of the original pressure difference in the clean room. for the above problems. In order to ensure that a certain pressure difference is always maintained in the clean room, certain measures must be taken to maintain the positive pressure in the room. The measures are as follows (1) Install an air damping layer at the return air outlet; (2) Install an electric airtight valve medium-efficiency filter on the exhaust pipe; (3) The residual pressure valve is generally located on the leeward side wall of the clean room. When such measures are taken, it is required to There must be enough residual air volume in the room; (4) Adjust the return air valve or exhaust valve; (5) Adjust the fresh air valve; (6) Interlock control of fans and air valves; (7) Regularly replace some necessary filters. Previous: What are the exhaust settings of the clean room? Next: Temperature and humidity inspection of the clean room
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