Solar heat gain, heat loss, and exterior temperature
This is something that as passed a few times in my background brain processes,
How does SHG on exterior cladding/glass influence heatloss ??
If glazings specs 50%VT , a part of the remaining 50% must be converted to heat?
If exterior cladding on a building is black, and sun is shinning on the south face,
it must affect the heatloss greatly for the shined on walls ??
As an example, let's assume a building up here cold north.
20c inside 0c outside.
Sun shines on a large flat south wall that was cladded with a black painted steel sheets finish.
The steel gets heated up to 20c, and it was installed flat , directly on the sheathing
( i know i know ..as an simple example )
Let's also assume a near mass less wall ( wall made out of EPS )
Logically, if i run my calculator to do heatloss on this wall,
it will get to 0 energy loss, because there is no delta t ...am i wrong ?
( theoretically please )
Then what about the glazings on windows.
During sunny winter days, the glazing gets much hotter than without sun.
So it must also affect the heat loss ??
I am sure some of you have the answer to that, or already though similarly.
Please share the knowledge !!!
Posted Aug 28, 2014 1:14 AM ET
Edited Aug 28, 2014 6:46 AM ET
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