News
Zhejiang Yitong Electromechanical Co., Ltd.
07
2023
-
11
Selection of Tunnel Fan
Author:
1. calculation of ventilation required in tunnel
2. calculation of total thrust required
1. Tunnel air inlet resistance and air outlet resistance
2. Tunnel surface friction resistance, resistance caused by suspension fan device, bracket and road sign, etc.
3. Traffic resistance
4. The resistance caused by the pressure difference between the entrance and exit of the tunnel due to different temperature, air pressure and wind speed
Overall scheme of 3. fan arrangement
According to the length of the tunnel, the required total thrust and the range of thrust provided by the jet fan, m groups of fans are initially arranged on the total length of the tunnel, with n sets in each group, and the thrust of each fan is t. The total thrust requirement of m × n × T ≥ Tt, taking into account the following conditions:
1. When n fans are juxtaposed, the transverse spacing of the middle line shall be greater than 2 times of the fan diameter.
2, m group (set) fan tandem, the longitudinal spacing should be greater than 10 times the tunnel diameter.
4. single fan parameters
The performance of the jet fan is measured by the thrust it exerts on the airflow. The thrust generated by the fan is theoretically equal to the momentum difference between the inlet and outlet airflow of the fan (the momentum is equal to the product of the airflow mass flow rate and the flow rate). Under the fan test conditions, the entering airflow The momentum is zero.
News
2023-11-07
2023-11-07
2023-11-07
2023-11-07
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