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30-01-2009, 10:05 PM #1
How to calculate the Flow rate of air blower(centrifugal type)
Please tell me the formula of flow rate of air blower (centrifugal type).
Regards
Nadeem
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30-01-2009, 10:45 PM #2
Re: How to calculate the Flow rate of air blower(centrifugal type)
Sorry, we are not manufacturers of ventilation fans here.
I suggest you ask somewhere else as this is a refrigeration forum.Brian - Newton Abbot, Devon, UK
Retired March 2015
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20-02-2009, 09:40 AM #3
Re: How to calculate the Flow rate of air blower(centrifugal type)
There are generally two possibilities that i know. One is to measure the air velocitiy in the attached duct work. Using the formula volume flow=hydraulic area (ductwork)* measured velocity, will give you the answer. The other possibilty is to utilize the the absorbed power vs. volume flow / differential pressure chart of the fan manufacturer. Therefore you have to measure the absorbed power of the fan motor. Hope that helps.
regards
EntropieRTFM always thoroughly!
Vacuum sucks!
Sience rules!
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22-02-2009, 09:02 AM #4
Re: How to calculate the Flow rate of air blower(centrifugal type)
hi all
the formula is Pt= Ps+Pv
Pressure total = Pressure staitis + pressure velocity
or
quantity= area*volume
if the duct is 2 metres by 2 metres volume is 2 metres/second
= 2x2=4 x 2m/sec= 8 cubic metres/second x that by 1000 = 8 litres a second
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22-02-2009, 07:57 PM #5
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22-02-2009, 08:23 PM #6
Re: How to calculate the Flow rate of air blower(centrifugal type)
CFM = Q/1.08 x TD
Q = Total BTU or another way is this:
http://www.1728.com/flowrate.htm
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22-02-2009, 10:58 PM #7
Re: How to calculate the Flow rate of air blower(centrifugal type)
His question is how much air will a centrifugal fan produce, not how to measure it in a duct.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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30-03-2009, 07:58 AM #8
Re: How to calculate the Flow rate of air blower(centrifugal type)
Volume flow rate = Area of the duct X velocity
remember area = pie X diameter squared/ 4
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30-03-2009, 06:46 PM #9
Re: How to calculate the Flow rate of air blower(centrifugal type)
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26-06-2009, 07:53 AM #10
Re: How to calculate the Flow rate of air blower(centrifugal type)
i too have an blower...its 550 cub.mt per min, and t manufacturer says a value 60mmAq...
I am not sure as to what pressure value to be taken if I use ideal gas law to calculate mass/molar flow rate to calculate air velocity
pls suggest
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