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  #1  
Old 5/9/13, 11:08 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Analyize these

Dave A here is some info for you this would have had me scratching my head if the owner had not been present and answered some quetions for me

These images were from the interior looking at the exterior walls A/C
operating Delta T was 14 degrees the wall studs were metal with dry wall that one could see.

Question why can you not see the wall studs with that much delta T??????
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analyize-these-ir_6624.jpg   analyize-these-ir_6628.jpg   analyize-these-ir_6629.jpg   analyize-these-ir_6630.jpg  



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  #2  
Old 5/9/13, 11:56 PM
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Default Re: Analyize these

Thermal break, no studs touch both inner and outer wall?



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  #3  
Old 5/10/13, 7:55 AM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Analyize these

Quote:
Originally Posted by rstrand View Post
Thermal break, no studs touch both inner and outer wall?
They have to touch the inner wall



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  #4  
Old 5/10/13, 8:12 AM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Re: Analyize these

Staggered wall studs install.



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  #5  
Old 5/10/13, 8:18 AM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Analyize these

Quote:
Originally Posted by mgratton View Post
Staggered wall studs install.
Nope they were a standard wall install nothing special about them



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  #6  
Old 5/10/13, 8:21 AM
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Charley L. Bottger Charley L. Bottger is offline
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Default Re: Analyize these

Without talking to the owner my clue would have been the size of the A/C units there were 2 on this 5K+ home a 4 ton and a 2-1/2 ton



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  #7  
Old 5/10/13, 11:29 AM
Jeffrey Moore Jeffrey Moore is offline
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Default Re: Analyize these

How long has the AC been running and Delta T reached?



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  #8  
Old 5/10/13, 11:49 AM
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Peter C. Russell Peter C. Russell is offline
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Default Re: Analyize these

How old is the home?



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  #9  
Old 5/10/13, 12:43 PM
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Default Re: Analyize these

Does it have something to do with where the Delta T was measured or was it 14 in the room you took the photos?



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  #10  
Old 5/10/13, 1:15 PM
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Default Re: Analyize these

Mass.

Though we think of metal suds as highly conductive, there is little mass to conduct heat across the wall cavity.

Metal studs are more energy efficient than wood...



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  #11  
Old 5/10/13, 1:23 PM
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David A. Andersen David A. Andersen is offline
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Default Re: Analyize these

BTW: this is in direct conflict with all the miss-information posted on the internet that says otherwise...

So don't start posting all that miss-information here. Thanks.

Do the math. How many BTU's can pass through 16ga metal 3.5" long? (actually longer if you flatten it out).
This is about "volume" of heat energy, not the "rate" of heat energy transfer.

Metal also has a lesser ability to absorb heat energy than wood.

The amount of heat that passes through a length of thin metal is also widely displaced across a wide area where it contacts the sheetrock. Harder to measure because the BTU/mass is not sufficient to increase the temp of the sheetrock.



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Last edited by dandersen; 5/10/13 at 1:33 PM..
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  #12  
Old 5/10/13, 2:13 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Analyize these

Quote:
Originally Posted by dandersen View Post
BTW: this is in direct conflict with all the miss-information posted on the internet that says otherwise...

So don't start posting all that miss-information here. Thanks.

Do the math. How many BTU's can pass through 16ga metal 3.5" long? (actually longer if you flatten it out).
This is about "volume" of heat energy, not the "rate" of heat energy transfer.

Metal also has a lesser ability to absorb heat energy than wood.

The amount of heat that passes through a length of thin metal is also widely displaced across a wide area where it contacts the sheetrock. Harder to measure because the BTU/mass is not sufficient to increase the temp of the sheetrock.
All the math in the world woud not have helped in this situation because behind the drywall all exterior walls and the ceiling had plywood installed to the interior with drywall attached to the plywood as the owner stated one can hang pictures on the wall anywhere.

As I stated above this would have had my thinking cap on had not the owner informing me before hand. I have never had a wall covered with both drywall and plywood on the interior side

Not many homes the size of this one in OKla with 110 degree summers with some humidity that can be cooled with the size of the units that were in use



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  #13  
Old 5/10/13, 2:28 PM
John Ritter John Ritter is online now
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Default Re: Analyize these

Quote:
Originally Posted by cbottger View Post
All the math in the world woud not have helped in this situation because behind the drywall all exterior walls and the ceiling had plywood installed to the interior with drywall attached to the plywood as the owner stated one can hang pictures on the wall anywhere.

As I stated above this would have had my thinking cap on had not the owner informing me before hand. I have never had a wall covered with both drywall and plywood on the interior side

Not many homes the size of this one in OKla with 110 degree summers with some humidity that can be cooled with the size of the units that were in use

built houses and remodeled kitchens for many years and all kits had plywood behind sheetrock. Hang boxes any where you want to.
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  #14  
Old 5/10/13, 2:48 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Analyize these

Quote:
Originally Posted by jritter View Post
built houses and remodeled kitchens for many years and all kits had plywood behind sheetrock. Hang boxes any where you want to.
I hear they do things like that east of the mississippi just not out here



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  #15  
Old 5/10/13, 2:55 PM
Juan C. Jimenez Juan C. Jimenez is offline
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Default Re: Analyize these

Hey Charley,

Is that little yellow square in photo four a switch?



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