Coefficient of friction and pressure loss of bag air duct system

Jiutian brand cloth duct, also known as: bag duct, fiber cloth duct, fiber fabric duct, fabric duct, textile duct, Soth duct, fiber fabric air distribution system, etc. It is a brand new energy-saving, green and environmentally friendly air supply system. Jiutian series air ducts have been popular all over the world for their uniform air supply, no dead ends, anti-condensation, and easy installation. The friction coefficient of the duct system is <0.024, which is close to the iron sheet. In fact, the friction resistance of the duct is much smaller than that of the traditional wind system, because the system is mostly circular, and the average wind speed, especially the middle and rear wind speed, is lower than that of the traditional system, and It is caused by many factors such as fewer branches. For simple straight pipe systems, because the resistance is less than the static pressure recovery, friction resistance can be ignored. For complex pipe systems, the resistance is only 1/3-1/5 of the traditional system. Therefore, the pressure value of the traditional system has enough surplus for the air distribution pipe. The air distribution pipe system can redesign the permeability of the material and the nozzle hole according to the pressure value to ensure the designed air supply volume without any additional requirements for the air conditioner. The Jiutian brand air duct pressure calculation method is basically the same as the traditional air duct, including all calculation formulas. The friction coefficient of the air duct is also basically the same as the traditional iron spiral duct (2pa-3pa/m), but the air duct system When calculating the pressure, the resistance loss along the way can be ignored, and only the partial resistance loss can be calculated. Because for the air distribution pipe system, the resistance loss along the way will decrease with the decrease of the wind speed in the pipe, the total resistance along the way is basically the same as the static pressure recovery value, even if there is a difference, it is relatively small, and the static pressure recovery It is often greater than the resistance loss along the way. Sometimes the PAD pressure balance valve is used instead to lose some dynamic pressure. Of course, in complex systems, local pressure loss such as elbows and tees needs to be calculated (15pa-20pa/m). Finally, it is important to point out that the bag air duct system is not compared with the traditional air duct system, and the end of the air duct must be left with a residual pressure of 50pa-80pa to ensure the expansion of the air duct.

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