Dynamic change of pressure in negative pressure workshops after accidents

In this paper, the dynamic change of pressure in the negative pressure workshops under the accident condition is studied, and the theoretical calculation method of pressure change after the accident is obtained. It is pointed out that the time for the room recovering the negative pressure depends on three factors, including the exhaust air volume, the heat exchange between leaked water and air, and the door crack area. The heat exchange between the leaked water and the air has a great influence on the peak of indoor pressure, and the door crack area has a great influence on the negative pressure recovering time. The diffusion law of the leakage material after the accident is analysed by the simulation, which can be used as a reference for the accident exhaust design of similar negative pressure workshops.