centrifugal fan

[pirestani]

Good time
Have you ever paid deep attention to the concept
of functional curve of centrifugal fans with thin ,
forward blades such typical one as "NICOTRA" ?
What happen when this blower works at the same
static pressure and different air flow rates on the
constant rpm ?
thanks s.pirs.

[BritCit_Juve]

Because the static pressure and external are tightly related I don't think this situation could exsist. The fan is usually selected, along with its motor, belts and pulleys, to meet a set criteria of airflow against static. Lower the static on that match and the airflow will go up and vice versa.

As an example when a fan is selected to do an airvolume of x against an external static of y but is used against an external static of d the equation is

resultant airflow R=1/(square root(x*(d/y)squared))

x and R are m3/s whilest d and y are Pa

I hope this helps

BritCit_Juve

[Dan]

I agree, I didn't realize that one could maintain the same static (Total static pressure) and change flow rates without resizing the devices that are in the air stream. I am not sure I understand the question.