If the temperature difference between the plenum and a duct is 8F (ie:
Plenum is at 120F duct at register is 112F) can this be translated into duct
Not that I can do much about it as all my ducts above a finished basement
ceiling just curious.
Easy enough....what you ask, as you ask, translates to no.
Now, had you said, after a run time of XX minutes, with a duct run of XX
feet, with a heat rise of XXX degrees, and a delta of XX with a velocity of
XXX FPS can this translate to a duct efficiency...and the answer would have
been a possible yes.
There is a bit more info that would be needed as well, such as duct
construction, age, diameter.......
8 degree loss on a run of say.....30 feet or less isnt enough to worry
Depending on how long the run time was, your delta with be less or
greater...so...as you ask...no.
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