Anyone tried stacking TEC's?

[Poki]

I have read about people contemplating this before and i think in theory it would work quite well.
Example: coldplate/80wtec/coldplate/172wtec/waterblock on a gpu?

Somebody got the resources to try it if it hasn't been done?
I think the hardest part is coming up with the proper mass on the secondary coldplate between the two pelts.

[CSOFT]

It dont work that good, once a TEC gets so cold it gets way less efficent

[trakie]

theres alot of resources at http://www.overclockers.com/topiclist/index21.asp#PELTIERS about peltiers. there are some informative articles and stuff, but its a little old.

[Holst]

Its another one of those things that may work, but nobody has ever made a great success with it.

With lower wattages then you can stack TECs to get very low temps, but the efficency is very poor.

[Poki]

Thanks guys this (http://www.overclockers.com/tips313/) really put my entire thought into perspective. It may even be what i read to begin with long ago.

[Tedinde]

Tried it 3 years ago, Doesnt work well.

You would be better off just using the 80watt tec alone than trying to cool the 80 watt with the 172 watt.

or just use the 172watt

[IamAnoobieCheez]

Cooling the 80watt tec with a 172watt tec is quite stupid idea in my opinion.

Stacking the tec's is stupid idea as well in my opinion.

You don't want to stack pelt. The pelt itself already is inefficient. If you must use more than one pelt to cool one thing, go parallel, not stacking. This means it would require a bigger, longer cold plate to cover the pelts.

Another thing, even though stacking pelts is stupid idea, you wanting to use another cold plate between the pelts is bad too. You don't want to have too many layers between the hot side of the pelt and cold side of the pelt. You'll lose efficiency there as well.

[]JR[]

/me continues to beat his head against a brick wall...

one day youll all learn tecs arent inefficent, its they way u use them that makes them inefficent. An overclockers problem isnt the heatload, its the space constraints that causes a problem.

If you read the waterchiller thread youll see that its easy to obtain above unity efficency from a tec, i.e. more heat pumped than energy input (think a fan, it pumps more heat than input energy too)

Yes the efficency drops off exponentially with hotside temperature, but -100c is acheievable although not practical. You could put together a gpu cooler to get to -50c easily enough... lemme run a simulation.

]JR[

[IamAnoobieCheez]

Of course the way it is used varies in efficiency of the pelt.

What did the subject say. Stacking, not peltier itself alone.

I use a pelt + waterchilled on a vid card and use its low temperature power to clock the thing way up, no volt mods of any kind. Almost 300mhz core out of a GF3 ti200 with no mod. Oh yeah, one pelt.