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Biggidy
Participant

Join Date: Nov 2009
Posts: 1

HVAC Fans

11/28/2009 8:49 AM

Hi all,

I am finding it very difficult to find specfic information regarding the following questions, your help would be most appreciated.

a) For what reasons would a Contra-Rotating Axial Fan (i.e. two Axial fans place in a series, impellers rotate in opposite directions) be used instead of a Single Stage Fan?

b) Why is a Contra-Rotating Axial Fan used as opposed to a Multi-Stage Axial Fan (i.e. two or more fans place in a series) for this purpose?

I think it's to do with the Pa

Thanks chaps!

Biggidy
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mayt2u
Power-User

Join Date: Aug 2007
Location: N.E. Alberta 55.6329 N Lat. 111.0729 W Long. Canada
Posts: 216
Good Answers: 7
#1

Re: HVAC Fans

12/02/2009 3:41 AM

I can think of two reasons, they may not be right, but worth a thought.

1) C.R.B. will exhibit almost no torque on the mount, as the blades will cancel each others out. A smaller one can be built and not interfere with the flow.

2) Wind flow should have less turbulence by the reduction of vortices and rotation than that would be from a multi stage inline assembly.

I'm thinking that you see this type of setup in wind-tunnels.

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