The air pressure issue of the fan
Thread Content
There is a small L05 type centrifugal fan with the following specifications: power: 0.18kw, speed: 2800rpm, air volume: 360m³/h, total pressure: 550pa. Question: 1. We want to utilize the wind pressure generated by this fan; there is no requirement regarding air volume. The nameplate of this fan indicates a total pressure of 550 Pa, but the wind pressure we need can reach up to 8 kPa. Is it possible to use this fan and increase the wind pressure to 8 kPa by reducing the diameter of the air delivery duct? 2. If the wind pressure can reach 8 kPa, and different wind pressures (such as 8 kPa, 6 kPa, 4 kPa, etc.) are required, what control method would be appropriate? Can using variable-frequency control to adjust the fan speed meet different wind pressure requirements?
By the way: What kind of inverter is needed for such a small fan? 500 Pa is already the maximum value – how can it reach 800? It’s not clear whether your fan is used for blowing air or for drawing air in. Finally, I suggest that for a fan of this size, it’s sufficient to simply replace it
The Q-P performance curve shows that as the flow rate decreases, the pressure increases； As the flow rate increases, the total pressure decreases. The fan operates within the stable zone to avoid unstable areas; adjustments to the fan are also made within this stable zone. Therefore, the above idea is unfeasible; only the fan can be replaced.
Thank you all! This small fan should be a blower. Previously, the flow rate of natural gas was regulated using the pressure of compressed air via a gas proportioning valve, but it was later found that fluctuations in the pressure of compressed air (such as when other devices that require compressed air are in operation) caused fluctuations in the natural gas flow rate, thereby altering the air-fuel ratio. To achieve stable pressure under different conditions, an additional fan is added to accomplish this! Question: Is it possible to adjust the ratio of the gas control valve (the original ratio is 1:1), for example by changing it to 1:12?