First, what is the permeability of the fiber fabric air distribution system!
The fabric air distribution system is made of fibers of a special material, and the permeability is an inherent characteristic of the fabric air distribution system.
Internationally, when the pressure inside the pipe is 125Pa, the surface area of ​​the fiber fabric reaches 1 square meter.
At 1 CFM (1 CFM = 1.68 m3/h), the permeability of the material was 1 cfm/ft2.
The unit conversion is available: 1cfm/ft2=18 m3/h/ m2. In China, we usually reduce the unit “m3/h/ m2†to “mm/sâ€.
Then:
1cfm/ft2=18 m3/h/ m2=5mm/s
Second, the importance of material permeability selection for fiber fabric air distribution systems
One of the characteristics of the fabric air distribution system is that the air volume of the equipment enters the work area through two ways. The first passes through the permeation of the fibrous material, and the second passes through the evenly distributed jet orifices (main channels) around the duct.
Generally, the infiltrated air volume is only used to prevent condensation, which only accounts for 5%~10% or less of the total air volume of the system (except for pure air supply mode).
If the permeate air volume undergoes excessive heat exchange, it will cause a certain waste at high altitude. Therefore, different permeability materials should be chosen for different occasions. Even in the same project, in different areas or different installation heights, the permeability materials we choose should also differ.
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