How to ensure the stability of fresh air volume in purification projects
How to ensure the stability of fresh air volume in purification projects
In the purification project, air cleanliness and air pressure difference are closely related to the air-conditioning system. Only by designing the air-conditioning system reasonably and selecting appropriate air-conditioning equipment according to the design can the air cleanliness and air pressure difference meet the owner's decoration requirements. . Fresh air refers to the fresh air in the clean room, and the air volume will directly affect the air cleanliness and the air pressure difference. So how should the fresh air volume be designed and how to ensure a virtuous circle of fresh air volume?
Fresh air is the need for people to breathe in purification projects. Because people will breathe when they move in the clean room, and breathing will reduce the oxygen content in the air and increase the carbon dioxide concentration. In order to ensure a good indoor air environment, there must be an appropriate amount of fresh air to replace the turbid air. Generally speaking, the fresh air is the same as the outdoor temperature, which is the cold source and humidification source of the clean room temperature in winter, and the source of dehumidification in the summer clean room. When designing the fresh air volume, the decoration designer needs to comprehensively consider the number of staff in the clean room and the CO2 emission. According to the design experience, the CO2 emitted by the human body per hour is 20L, the upper limit of the CO2 concentration to be maintained in the room is 700ppm, and the CO2 concentration in ordinary air is is 376ppm, so the fresh air volume should be 61m3/h.
In addition to designing and installing the air-conditioning system according to the 61m3/h fresh air standard, the clean room project should also pay attention to compensating for the stability of the exhaust air, so as to ensure the stability of the fresh air. There are many renovation projects that may cause air leakage. Once air leakage occurs, the clean room will increase the compensation exhaust volume, resulting in insufficient fresh air volume. To this end, it is necessary to do a good job of sealing the doors and windows, decorations, exhaust pipes, etc. of the purification project to ensure that the total amount of indoor air leakage is consistent with the fresh air volume.
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