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LUU VINH THANH
Member

Join Date: May 2012
Posts: 6

Ventilation Fan

01/03/2014 5:22 AM

Dear all friends

I am looking for the formula of centrifugal fan design :

Flow rate : 800l/s

SP : 300 pascal

Please give me an advise.

many thanks
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GMZ Ahsan
Member

Join Date: Aug 2013
Posts: 9
#1

Re: ventilation fan

01/03/2014 7:36 AM

Check GreenHeck fan selection data that is available in a large variety or other standard make fan data/curves available in your area. This will be a within 1HP fan
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#2

Re: ventilation fan

01/03/2014 7:54 AM

You've given the main parameters a supplier needs to select a fan, assuming SP is the pressure rise (not suction pressure). If not you need to specify pressure rise.

Also helpful to give inlet pressure and temperature, and gas density. If you don't give these he's likely to assume atmospheric pressure, ambient temperature (say 15°C) and air.

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GMZ Ahsan
Member

Join Date: Aug 2013
Posts: 9
#3

Re: Ventilation Fan

01/04/2014 12:12 AM

0.5HP (half HP) motor would suffice

BHP=cfmxSP(inches)/6356/fan efficiency (0.75say)
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#4
In reply to #3

Re: Ventilation Fan

01/04/2014 6:43 AM

OK if SP is the pressure rise. OP hasn't confirmed. If so I don't know what the S stands for.

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Yusef1
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Join Date: Jun 2006
Location: Ottawa Canada
Posts: 1975
Good Answers: 117
#5

Re: Ventilation Fan

01/04/2014 9:22 AM

are you texting from your seat at the school testing table?

Sorry, I am sounding as frustrated as Lyn! Google IS YOUR FRIEND!

You can find any information you need with only a few minutes searching.

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Codemaster (2); GMZ Ahsan (2); Yusef1 (1)

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