High rise, whistling windows

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Old 11-17-13, 07:03 AM
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High rise, whistling windows

We live on the 7th floor in a building in the city. The windows sort of face a back alley area which I'm sure accounts for a lot of the wind channeling. When the windows are closed, everything is fine. The problem is when you open it, it creates a high pitched whistling noise. I liken it to the logic behind a whistle; high pressure, small area, LOUD WHISTLE!!

Has anyone ever come across something like this? I was wondering if there was something I could place in/on the window that would reduce the whistle or even redirect the breeze. Being winter in Chicago I'm not too concerned with an active breeze. Just a little temp change to counter the intense building wide heat!!

Thoughts??
 
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Old 11-17-13, 07:17 AM
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That's a hard one to engineer. I would be experimenting with window combinations and covering different portions of the noisy one to try to identify any changes. Like the little toy whistles, the sound changes as the air flow changes.

I assume you have some form of screen or steel covering the outside of the window.
Is the air exiting or entering? Check both high and low.
Does the sound occur only when the wind blows or anytime the window is open?

High rise building are subject to significant natural pressures due to temperature differences between inside and out. Is that 7th floor low, middle, or top of the building?

Bud
 
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Old 11-17-13, 07:41 AM
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First thing I'd do is identify the exact location of the whistle, using a cardboard tube held to the ear or similar.

I'm guessing the sound is being created in the same manner as blowing across the mouth of a bottle. Perhaps it's travelling up the side channels of the windows. Placing foam blocks in the hollow channels left and right of the window sash may shot that sort of whistle. If there is a screen, remove it, and see if that helps. If that doesn't help, you probably need baffles/louvers to change the way (the angle) the air is blowing across the window opening.

Is this radiant heat or what?
 
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Old 11-17-13, 10:00 AM
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Thanks guys!

Yes it is radiant heat set by the building. We don't have any control over it.

I will definitely have to play around see if I can get the wind pattern to cross quietly. It's air entering not exiting. If I open the window an inch, I get a high pitch whistle. If I open it a foot, it's much less apparent. Fine for the summer, cold for the winter!
 
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Old 11-17-13, 10:31 AM
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There may be a weatherstrip on the bottom of the windows that's fluttering. You could try holding your hands on the bottom of the sash and see if it will change the "tune".
 
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