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Poll on who believes that @ 0dt tecs will stop moving heat

post #1 of 7
Thread Starter 
Id love to see what this community thinks..

regards
lichking
Edited by lichking - 4/18/11 at 10:53am
LKTEC
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LKTEC
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post #2 of 7
Well I'm not an expert on TEC's, but will express my opinion.

We all know that at DTmax=0, Qc=Qmax. And so the TEC must be moving heat in order for DTmax=0. Otherwise how would DTmax=0 without moving heat?

I would stop being so disrespectful, zipdogso has always been correct regarding TEC's, and has been posting alot longer than you and I have. At least wait for zipdogso to post, before making small insults.
Edited by xtremetechuk - 4/16/11 at 11:59pm
post #3 of 7
I think of a TEC with a Pool on two sides, one of them constantly filling, connected with a Pipe which would be the maximum Wattage (heat) able to be moved across it. Once that pipe is filled to the maximum, the one side that is constantly filling will continue to fill, but that pipe will always be moving heat across it.

Dunno if that's what was being asked, but I feel that it's always moving heat, but if there is too much, it will back up on the one side, and there's your insulating blanket. (Hope this didn't make me look like an idiot, But it's what I saw when I tested this.) If it weren't moving heat, the heat would back up a hell of alot faster than it does on the one side.

EDIT: I guess a Dam is the best representation of what I was babbling about.
Edited by Krow - 4/17/11 at 1:45pm
Whitey!
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Whitey!
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post #4 of 7
When zipdogso said you can't move any more at a dt of 0 it's true. dt and Qc are inversely relational as Qc increases dt decreases. Such that at Qmax dt = 0. So the hot side and cold side reach roughly speaking the same temperate (in ideal physics). Since of course there are things such as thermal resistance these temperatures may not quite be the same but for all intensive purposes they are equal at dt = 0 and Qc = Qmax. When you try and move more heat there is no "energy" for that heat to be moved so it stays on the cold side warming it up. Try moving 420w with a 400w Qmax TEC. It will move a Qc of 400 and at it's Qmax 400 at a dt of 0. The other 20 watts will not be moved and so will warm the cold side up. This is just how all heat pumps work, including refrigeration (phase change cooling).
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post #5 of 7
@Flak-Spammer,
Common Sense.

I think the thread title is misleading, and suggests that at Qc=Qmax NO heat is being moved. When in actual fact heat is being moved at Qc=Qmax, however has reached maximum pumping capacity, and unable to move any additional heatload.
post #6 of 7
^^ Lichking hmmm i thought you were number 1 LOL!!!!
post #7 of 7
Unfortunately the error is due to the fact that lichking was not paying close attention to what zipdogso said. Which is basically what I just restated using a few different words.
theonering
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theonering
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