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Saad419
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Join Date: Mar 2020
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Centrifugal Fan Calculator

07/22/2020 8:10 AM

I was wondering if there is an online calculator for Centrifugal fans. I wanted to see the effect on conditions when we vary the inlet to impeller and outlet duct size. So far I am having troubles finding equations or a calculator. Help would be appreciated
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Rixter
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#1

Re: Centrifugal Fan Calculator

07/22/2020 8:14 AM

https://www.calqlata.com/productpages/00060-help.html
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Anonymous Poster #1
#2

Re: Centrifugal Fan Calculator

07/22/2020 8:21 AM

https://cr4.globalspec.com/thread/136006/ID-Fan-Design-Calculations-Equations
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Saad419
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#3
In reply to #2

Re: Centrifugal Fan Calculator

07/22/2020 8:24 AM

Unfortunately, that thread doesn't really have any equations. Simple equations would do too but I am struggling to find them online
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PWSlack
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#4
In reply to #3

Re: Centrifugal Fan Calculator

07/22/2020 8:28 AM

...then find them off line. Try things called "books" instead.

Anyway, the claim in #3⇑ doesn't correspond with the information given in the link in #1⇑.

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SolarEagle
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#5

Re: Centrifugal Fan Calculator

07/22/2020 11:07 AM

If your inlet and outlet is not properly sized, you create turbulence, fan calculators are based on properly sized and matched components to calculate air flow...an improperly designed fan housing would need to be tested on-site for loss of airflow...

https://www.sciencedirect.com/science/article/pii/S2214157X13000063

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kkopanke
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#6

Re: Centrifugal Fan Calculator

07/22/2020 11:51 PM

Excessive velocity is caused by reducing area while maintaining the same flowrate through a nozzle. This is one reason turbulence occurs, like Solar Eagle mentioned.

NEMA SM23 outlines maximum nozzle velocities for a given nozzle (calling inlet/outlet nozzle here) size. I recommend reviewing these maximum velocities per nozzle size, then reviewing against your needs. Anything exceeding these velocities will lead to high noise. These are good for any fluid.

The last publication of NEMA SM23 was in the early 90’s, but the information is still widely referred to for rotating equipment manufacturers.
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tonyhemet
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#7

Re: Centrifugal Fan Calculator

07/23/2020 12:04 AM

I'm not sure if this will help you. Years ago at an industry trade show I picked up a Air Duct Calculator, provided free of charge by Goodman. It provides many things including, formulas, glossary, visual descriptions, index and legends. It's one of those paper calculators with a slide index.

2013 Datalizer, Addison, il. www.datalizer.com
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Anonymous Poster #2
#8
In reply to #7

Re: Centrifugal Fan Calculator

07/23/2020 12:39 AM

I eould appreciate if you vould link me up with the calculator
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Saad419
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#9
In reply to #8

Re: Centrifugal Fan Calculator

07/23/2020 12:41 AM

Yes please.
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tonyhemet
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#12
In reply to #9

Re: Centrifugal Fan Calculator

07/23/2020 9:29 AM

I picked up my Goodman calculator at the IHACI trade show. I imagine that solar eagle picked up a calculator at the ASHRAE / AHR expo.

Or you could contact Goodman. They have an office in Waller, Texas.
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SolarEagle
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#10
In reply to #8

Re: Centrifugal Fan Calculator

07/23/2020 1:29 AM

https://www.cdicurbs.com/ductcal

https://slideplayer.com/slide/13769227/

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Kaisan
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#11

Re: Centrifugal Fan Calculator

07/23/2020 4:58 AM

Looks like you are wanting to know the effects of inlet and outlet ducting rather than a centrifugal fan calculator. If that is so then this may be of some use.

https://www.achrnews.com/articles/96369-minimizing-system-effect

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keith perry
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#13

Re: Centrifugal Fan Calculator

07/27/2020 11:44 AM

New York Blower has a series of "engineering letters" detailing fan and air movement concepts. In addition they have a fan to size program for aiding in fan selection and performance. https://www.nyb.com/engineering-letters/ is the basic link. Good hunting.
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Users who posted comments:

Anonymous Poster (2); Kaisan (1); keith perry (1); kkopanke (1); PWSlack (1); Rixter (1); Saad419 (2); SolarEagle (2); tonyhemet (2)

Previous in Forum: Screw Feeder (Auger) Calculation for Variable Flow Rate with Single Screw   Next in Forum: Lathe Machine Query

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