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Peltier question...

post #1 of 10
Thread Starter 
My friend and I are thinking of making our own TEC CPU cooler, as an experiment to nuke some 775 chips with. Our question is - How do you prevent condensation on the peltier unit?

Thanks!
post #2 of 10
to prevent condensation you usually use a water tight gasket around the TEC and CPU socket then insulate around the gasket enough that the outside of the insulation is close to ambient temperature. Though I don't think you are going to need to worry about condensation because it is going to take a lot of TEC to give you sub ambient temps. I did a similar thing with an old celeron rig and a 45w TEC by 45w I mean rated at 45w of heat transfer. And even though the celeron has a TDP of 10w I could barely get it below 15C.
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post #3 of 10
If you buy a tec like the first(up) tec in the photo you have to sealed it with silicon if you buy a tec like the second(down)you dont have any problem.But the most sellers sale there tecs sealed.
post #4 of 10
5 pack

I ordered one of these 5 packs and have not gotten bold enough to try in on my main rig, but the one I tested open air did not have any condensation problems. What Heatsink are you going to use on top of your peltier.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by cook;15519116 
5 pack

I ordered one of these 5 packs and have not gotten bold enough to try in on my main rig, but the one I tested open air did not have any condensation problems. What Heatsink are you going to use on top of your peltier.

I was thinking of stripping down something like a megahalems or simply salvaging a heatsink from an older CPU cooler, then jdwelding the peltier onto it.

Which kind-of raises another question, is attaching a peltier to a molex as simple as red-to-red, black-to-black, or is there something I need to do to it?
post #6 of 10
You need to know how much current it will be pulling at the voltage you want it to run at. Anything more than 4 - 5A is pushing it with a molex connector.

Yellow = 12V
Red = 5V
Black = Ground

If you run at 12V, I think you'll be past the limit a Molex connector likes and will get really hot, discolor the connector, melt it or even start a fire.

5V make a really small delta, not enough to cool your CPU with those TECs as singles. I double even 12V would do it. You'ed have to have them running in parallel.
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Krow;15521386 
You need to know how much current it will be pulling at the voltage you want it to run at. Anything more than 4 - 5A is pushing it with a molex connector.

Yellow = 12V
Red = 5V
Black = Ground

If you run at 12V, I think you'll be past the limit a Molex connector likes and will get really hot, discolor the connector, melt it or even start a fire.

5V make a really small delta, not enough to cool your CPU with those TECs as singles. I double even 12V would do it. You'ed have to have them running in parallel.

I watched some videos, and even a 90w peltier froze water after about 30 seconds on a 9V.

Which makes me think, could it work if I stuck it on a 12V rail?
post #8 of 10
Quote:
Originally Posted by TakMan;15522060 
I watched some videos, and even a 90w peltier froze water after about 30 seconds on a 9V.

Which makes me think, could it work if I stuck it on a 12V rail?

first, that video was with no load... second... in order to prevent condesation you need to insulate... look at some of the stickies on the LN2 subforum... lastly... a 90W TEC wont get you anywhere... when i used TECs i tened to use a 600W TEC and just tone it down (more efficiant and more power if needed)... i would reccomend at least 200W if you want any kind of results... the problem is that at that point you will need a WCing loop to cool the hot side (air simply wont do that much load)... i would read somemore before you actual do anything with TECs as they can be hard to deal with if you dont know what to expect... just my 2cents.gifsmile.gif
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post #9 of 10
I would get a 12v fan controller to utilize the rheostat the monitor the current. You could also wire up an external 12v power supply to keep the psu intact until the proving phase is over. That is what I am playing with an I think I shorted one out already not having it touching anything.
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post #10 of 10
You might want to take a look in this thread:
http://www.overclock.net/peltiers-tec/1092075-drop-waterblock-sandy-bridge-without-tec.html
 
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