Hello,
How to calculate the electrical power needed to operate a fan? I know the duty of the fan.
Thanks
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Posted 18 October 2015 - 06:34 AM
Hello,
How to calculate the electrical power needed to operate a fan? I know the duty of the fan.
Thanks
Posted 18 October 2015 - 07:15 AM
Bal,
For quick estimation:
HP=(CFM*PSF)/(33000*Efficiency); where:
CFM: Cubic Feet per Minute): Delivered Volumetric Flow Rate
PSF: Pounds per Square Foot): Total pressure Increase
Posted 18 October 2015 - 08:44 AM
Thanks a lot Naser.
what typical values for efficiency and PSF can I assume (for a simplified solution)?
Posted 18 October 2015 - 10:55 AM
what typical values for efficiency and PSF can I assume (for a simplified solution)?
Bal,
Typical value for PSF is 100 (should be below around 300) and typical value for efficiency is around 70%...
Posted 18 October 2015 - 11:32 AM
Thanks.
One last question: where can I find this equation? cz i need the reference
Posted 18 October 2015 - 01:03 PM
Is it related to the one in GPSA?
CFM is the flow rate of the fluid or the air?
Posted 18 October 2015 - 06:46 PM
Hi Bal ,
Consider the excel sheet attached to support your work
Breizh
Edited by breizh, 18 October 2015 - 07:58 PM.
Posted 18 October 2015 - 07:48 PM
I found this among my collection. Maybe it still works.
Bobby
Posted 18 October 2015 - 10:40 PM
Thanks a lot Breizh and Bobby.
Posted 01 November 2015 - 11:19 AM
Bal,
For quick estimation:
HP=(CFM*PSF)/(33000*Efficiency); where:
CFM: Cubic Feet per Minute): Delivered Volumetric Flow Rate
PSF: Pounds per Square Foot): Total pressure Increase
How to calculate CFM?
is there any rules of thumb?
Posted 01 November 2015 - 11:31 AM
How to calculate CFM?
is there any rules of thumb?
When it's intended the fan power to be calculated; the required CFM has to be specified by whom is performing such calculation...!
Posted 01 November 2015 - 11:43 AM
That's true, but I'm trying to estimate the fan power for a project and I can't deny my lack of knowledge this area.
The only information in my hand is the duty of the air cooler (2.73 e6 BTU/hr).
The procedure in the GPSA is lengthy and considers some design details that I don't actually need.
I found another book (rules of thumb of chemical engineers by Carl) and it gives a shorter path for calculating the fan power, but I can't use it even because it requires ACFM value and number of tube raws (I don't care about this one).
I realized that you can't proceed with the fan power calculations without the ACFM,,,,but
Is there anyway to relate the ACFM needed with the duty of the fan?
Posted 01 November 2015 - 11:45 AM
Q=M Cp dl T??
Posted 01 November 2015 - 11:59 AM Best Answer
Bal,
One BTU/hr is almost equal to 0.3 watts...Then considering a typical value of efficiency equal to 70% you can easily estimate the fan power value...
Posted 01 November 2015 - 12:11 PM
Thank you very much
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