The core clean area of the negative pressure biosafety laboratory decoration adopts the air supply method that is evenly covered with high{{0}}efficiency filters. The indoor vertical laminar flow is used for upper air supply and lower return air. The interface wind speed is 0.3m/s. The core clean area is relative to the outdoor static pressure plus 20Pa. The return wind comes from the ceiling interlayer. The dust particle concentration in the maintenance channel reaches 10,000, and the relative outdoor static pressure is plus 5Pa. The flow of people in the core clean area of the clean and dust-free laboratory adopts: dressing→air shower→buffer→core clean room, maintenance channel (ten-thousand grade), the flow of people adopts: dressing→air shower→buffer→maintenance channel; an air shower is set at the entrance of the clean room, It can effectively remove the dust carried by the human body and reduce the amount of dust in the clean room. At the same time, the air shower room also acts as an air lock to prevent unclean air from entering the clean area through the door. Logistics adopts: transfer through window, separate flow of people and logistics to reduce dust pollution.
In order to ensure that the airflow flows from the "clean" area to the "contaminated" area, and from the "hundred-level" area to the "ten-thousand-thousand" area, relative pressure should be maintained between each function. The positive pressure is set by the touch screen, controlled by the room micro pressure sensor plus VAV variable air volume valve, and corrected by PID online calculation in real time to ensure a constant pressure difference between each function.
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