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sabapara
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Join Date: Aug 2009
Posts: 14
Good Answers: 1

Wind miling in Cooling Tower

10/22/2009 4:30 AM

Dear All,

I want to know the method to prevent wind milling of FAN in Cooling Tower.

Any Perticular type of arrangement is used or Gear are designed Accordongly?

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 Viral Patel
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Pathfinder Tags: Wind Milling
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#1

Re: Wind miling in Cooling Tower

10/22/2009 11:21 PM

Some possible methods:

1. A brake motor for the drive. (Power on releases the brake; power off applies it.)

2. Air dampers (louvers) in the inlet air stream, with a motor to open or close.

3. Some other shaft brake.

4. A movable shoe that impinges on the fan impeller to stop it from turning.

Of these, I suspect [1] is the best, and [4] the oddest.

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perry
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#2
In reply to #1

Re: Wind miling in Cooling Tower

10/23/2009 10:28 AM

tornado; you could have a control that puts DC voltage on 1 phase winding of the motor when it is off line. perry
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Tornado
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#3
In reply to #2

Re: Wind miling in Cooling Tower

10/23/2009 11:21 AM

Thanks! I was wondering about electrical means to do it, but I didn't know of this technique. What are the calculations involved, to get sufficient holding force without overheating the motor?

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