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Popping Noises Coming from Aluminium Clad Windows. BS 5/9/2012
South facing windows to make a loud popping sound. The condition occurs when the windows are under solar load, and the exterior ambient temperature is 30 degrees F or lower, then if there is cloud cover or the sun sets, the windows make a loud popping sound. Infrared Images taken from the aluminum clad windows at the exterior indicate Delta T Temperatures of 70-80 degrees F. The Linear Thermal Expansion of Aluminum is 12.3 X 10-6 per degree F.
This condition has been occurring in some homes with no visible damage to the window, walls, sheetrock etc.

If someone has experienced this condition and knows of a possible resolve, please respond.
 
Re:Popping Noises Coming from Aluminium Clad Windows. JKEngineer 5/10/2012
Just a guess, but it sounds like thermally driven buckling. Sometimes called oil canning. Without being very sure, it suggests to me that the edges of the window frame are too tightly constrained so that when they grow due to the temperature increase they are forced to buckle rather than expand in the wall penetration.
JUST A GUESS! Don't take it to the bank. ;-)
Jack
 
Re:Popping Noises Coming from Aluminium Clad Windows. JKEngineer 5/10/2012
Just a guess, but it sounds like thermally driven buckling. Sometimes called oil canning. Without being very sure, it suggests to me that the edges of the window frame are too tightly constrained so that when they grow due to the temperature increase they are forced to buckle rather than expand in the wall penetration.
JUST A GUESS! Don't take it to the bank. ;-)
Jack
Jack M. Kleinfeld, P.E.
Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering

Bronx, NY 10463

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