Calculating pressure created by fan
Calculating pressure created by fan
(OP)
I have a project coming up and I need some help when it comes to the dynamics of fans and output pressure.
If I have a fan that blows a certain amount (CFM) of free air into a pipe of a certain diameter, how do I calculate the PSI in the pipe and the rate of flow?
I have drawn a diagram:
If I have a fan that blows a certain amount (CFM) of free air into a pipe of a certain diameter, how do I calculate the PSI in the pipe and the rate of flow?
I have drawn a diagram:





RE: Calculating pressure created by fan
There are graphs for duct friction, expressed in inches wg per 100 ft, for different flow rates and duct dimensions and rugosities.
I can recommend Fan Engineering by the Buffalo Forge Company edited by Robert Jorgensen, as an excellent engineering handbook. It will provide you also with an estimation of entrance and exit losses.
RE: Calculating pressure created by fan
RE: Calculating pressure created by fan
RE: Calculating pressure created by fan
The way you phrase your problem now it is simply a question of finding the capacity of the 1" pipe. You will need to define your initial pressure(P1), the final pressure (P2) the length of the pipe (L), the inside diameter (D), etc.
You can use the McQuay DuctSizer program which can be downloaded at the attached link.
In theory, once you find the capacity of the pipe, you can then select a fan of the same capacity and you will get the pressure drop that you want - under steady state conditions. In practice, it may not be that easy. Good luck.
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RE: Calculating pressure created by fan
RE: Calculating pressure created by fan
Read well what vzeos has said: P1- P2 is the pressure to be overcomed.
RE: Calculating pressure created by fan
Maybe you need to review the fan laws. Refer to the following link: http://ww