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# Differential pressure cold storage

2021/08/21
What is 'pressure difference' cold storage everyone knows, 'people go to high places, water flows to low places'The role of. In the clean zone, the pressure difference between each room relative to the outdoor atmosphere is called 'absolute pressure difference'. The pressure difference between each adjacent room and adjacent area is called 'relative pressure differenceWe assume that the absolute pressure difference of room A is P1 and the absolute pressure difference of room B is P2, then the pressure difference between A-B is △Pu003dP2-P1. Sometimes because of language habits in cold storage, we will refer to both 'absolute pressure difference' and 'relative pressure difference' as 'pressure difference'. For example, when we say 'pressure difference in room xx'For example, when we say 'the pressure difference between room xx and room xxThe relationship between the number of air changes in a clean room and the pressure difference: The number of air changes in a clean room has nothing to do with the pressure difference between the clean room and the outside world. The number of air changes is the quotient of the total air intake per unit time in a clean space/the volume of the space. The more pollutants in the space and the higher the level of cleanliness, the more air changes are required. The pressure of the space is the margin of the inlet air volume greater than the return air volume to maintain a certain pressure level. The pressure difference is the difference between the pressures of adjacent spaces. The role of 'pressure difference' Cold storage is because air always flows from a place with a high absolute pressure difference to a place with a low absolute pressure difference. Therefore, we must ensure that the higher the absolute pressure difference in the room, the higher the absolute pressure difference, and the lower the absolute pressure difference in the room. The lower the pressure difference, so that when the clean room is working normally or the airtightness of the room is damaged (such as opening the door), the air can flow from the area with high cleanliness to the area with low cleanliness, so that the room with high cleanliness is clean. The degree is free from pollution and interference from the air in low-level rooms. Because this kind of pollution and cross-contamination are intangible and ignored by many people, at the same time, this kind of pollution is very serious and irreversible. Once it is contaminated, there will be endless troubles. Therefore, we list the air pollution in the clean room as the “second largest source of pollution” after “human pollution.” Some people say that this pollution can be solved by self-purification, but self-purification takes time, and if it pollutes the equipment in the room, The facilities and even the materials have been contaminated, so self-purification has no effect. Therefore, the necessity of ensuring the pressure difference control is obvious. Bingquan cold storage video is connected to Bingquan-cold storage project-life-high-definition full genuine video online watch-Youku (youku. com)
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