The impact of the damper position in centrifugal fans on fan performance
Thread Content
This post was last edited by chengjk204 on 2017-9-5 17:12. Question: I’ve noticed that on centrifugal fans, the air valve is sometimes located at the inlet and sometimes at the outlet. Does the location of this valve have any impact on the fan’s performance? PS: I often see that the dampers of fans are located at the outlet of the fan, and these dampers are usually square in shape. In contrast, the dampers of exhaust fans are placed at the inlet of the fan, and they are circular in design. This may vary depending on the industry; it’s possible that the designs differ from what I’ve seen. Are axial fans the same as centrifugal fans? (But the first impression is that the damper of an axial flow fan can only be installed at the inlet.)
Assume that imports are more energy-efficient than exports.
I consulted the fan manufacturer, who replied that the damper should be placed at the air inlet to adjust the fan’s performance； When the damper is installed at the outlet, it regulates the system resistance. The second sentence isn’t quite clear; does it mean that by reducing the size of the air outlet valve, the airflow decreases while the air pressure increases? ； Increasing the damper on the air outlet raises the air volume while reducing the air pressure. Welcome to those with more experience to offer guidance
What’s unclear is； f(x) = PVTU represents the state of fluid flow, showing how pressure, volume, velocity, and temperature are related to each other.
The other person explained it in detail, but you still don’t understand. The inlet control damper can alter the flow pattern at the inlet, thereby affecting the performance of the fan. The outlet damper can change the resistance in the piping system, thus regulating flow rate and pressure. When the speed remains constant, an increase in wind pressure results in a decrease in flow rate; this can be seen from the fan’s performance curve