The correct value of the flow velocity in the duct of the air distribution pipe system

The air distribution pipe is an air conveying system. The fiber fabric air distributor is an air distribution system. These two are different concepts. The cloth bag air duct is an air outlet mode assisted by fiber penetration and nozzle holes to achieve uniform air output. It is a collection of insulation materials, ventilation pipes, A new generation of ventilation system products integrating air outlets and air valves. The value of the flow velocity in the duct: Generally, the flow velocity in the duct is (7-9) m/s according to the theory, (design calculation formula: Q: total inlet flow (m3/h) V: wind speed in the pipe (m/s) D: Pipe diameter (m) Qu003d3600V*π*D²) If the flow velocity in the pipe is too large and the pipe section inside is too small, the system resistance is also large, and the pressure of the fan needs to be high, which consumes more power, and it may This leads to increased noise. If a lower wind speed is used, the opposite situation described above will occur. Therefore, in the value of wind speed, there must be a most economical wind speed value. According to economic comparison, the wind speed of the air distribution pipe in the air-conditioning system can be adopted as follows: In the general air-conditioning system, the air distribution pipe adopts a low wind speed; The wind pressure direction approves the space. Friction resistance coefficient; average flow velocity of air in the duct, m/s; air density, kg/m3; duct length, m; circular duct diameter (inner diameter), m; friction resistance coefficient is an indefinite value, it It is related to the air flow state in the duct and the roughness of the duct wall. According to the comprehensive study of the fiber material and the duct system, the friction resistance coefficient is not more than 0.024 (about 0.019 for the iron duct). There are air supply holes in the direction of pipe extension, and the average wind speed in the pipe is 1/2 of the inlet speed of the air pipe. It can be seen that the extension loss of the air distribution duct is much smaller than that of the traditional iron duct.

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