【 Weak current College 】 fan equipment model reference----Power By 【 China power house network 】

Fan selection General according to the following steps:
1. calculation to determine the required inside the tunnel ventilation rate;
2. calculate the total thrust It needed
It=△P×At(N)
Which, At: tunnel cross-sectional area (m2)
△ P: the sum of the resistance (Pa); General into the following four items:
1) tunnel inlet resistance and outlet resistance;
2) tunnel surface friction, suspension blower Assembly, bracket and signs of resistance;
3) traffic resistance;
4) tunnel between imports and exports due to temperature, pressure, wind speed and health of the pressure difference of resistance.
3, determine the overall programmes of fan arrangement
According to the length of the tunnel, as well as the general thrust jet fans provide thrust range, the preliminary determination in the tunnel length m Group on common layout, each group of fan n desk, each Typhoon machine thrust to T.
Meet m×n×T ≥ Tt total thrust requirements, taking into account the following restrictions:
1) n Typhoon machine-by-side, its center line horizontal spacing should be greater than 2 times the fan diameter
2) m Group (Taiwan) fan series, vertical spacing should be greater than 10 times the tunnel diameter
4. single Typhoon machine parameters
Jet fan performance to its imposed on airflow measured thrust, fan-generated thrust in theory is equal to the import and export air blower of momentum deviation (momentum equal to air mass flow and velocity of the product), in fan test condition first, import flows of momentum is zero, so you can calculate the test conditions, fan of thrust:
Theory thrust = p×Q×V = pQ2/A (N)
P: air density (kg/m3)
Q: air flow (m3/s)
A: fan outlet area (m2)
Test bench measured thrust T1 General theory thrust 0.85-1.05. depends on the flow distribution and blower internal and muffler structures-fan performance parameters of the chart in the fan thrust data to test bench measured thrust, whichever is greater, but measured thrust is not equal to the fan installed in the tunnel to the available thrust T, this is because the fan hoisting in tunnels are tunnel airflow velocity produces effects of unloading (Kodak en effect), the available thrust reduction. extent available coefficients K1 and K2 to represent and calculation:
T = T1×K1×K2 or T1 = T (K1×K2)
Where t: installed in a tunnel in jet fan available thrust (N)
T1: test bench measured thrust (N)
K1: the average speed of air flow in the tunnel, as well as fan outlet velocity on fan thrust coefficient
K2: axial flow fan off the tunnel wall distance coefficient between
The following occasions selection analysis using blowers
Warehouse ventilation
First, look at the warehouse goods is flammable and explosive goods, such as: painting the warehouse, you must select the explosion-proof series fan. Secondly, at the level of noise requirements, you can select a roof fan or environmental protection type centrifugal fan, (and there are sections of the roof fan is the wind starts, you can save power.
Finally, at the warehouse air rate, you can choose the most traditional SF-type axial-flow fan or fan-FA.
Kitchen exhaust
First of all, for indoor vertical soot kitchen (i.e. outlet in indoor wall), you can choose the size according to the fumes from SF-type axial-flow fan or FA-exhaust fan.
Secondly, for cooking and cooking needs through long pipe and tube bending in the kitchen, it is strongly recommended that you use a centrifugal fan (4-most common 72 centrifugal fan, low noise 11-62-friendly centrifugal blower is also very practical), this is because the pressure centrifugal fan with axial fans, and smoke without motor, motor maintenance and easier to change. Finally, it is recommended that the fumes from strong kitchen use both of these programmes and, better.
Upscale place ventilation
For hotels, tea, coffee, chess room, karaoke Hall upscale place ventilation, inappropriate use of conventional fan.
First of all, for a small room ventilation, the ventilation pipe connecting the Central vent room, can accommodate appearance and noise basis, select FZY series small axial fans, its small size, plastic or aluminium look, low noise and high air flow.
Second, the amount of wind and noise requirements more stringent, wind chassis is the best choice. Box inside muffle cotton, external Central ventilation pipe after the remarkable noise reduction can be achieved.
Finally, add that for gym indoor air, be sure to select the large air volume of FS-industrial electric fan, rather than SF-post-type axial-flow fan. This is from the appearance and safety considerations.