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Using TEC with standard Waterblock. Possible?

post #1 of 8
7/3/12 at 8:52am
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After I saw some Peltiers for sale, it piqued my interest in thermoelectric cooling, and so naturally, I came here for some info. After reading the stickies, I am a little confused. Do I have to use a specific waterblock with built in TEC? The reason I ask is that I already have a system with a nice Swiftech cpu block, and wouldn't want to go buy a nearly identical block, just because it has the TEC built in. Is there any way I could get a standalone TEC, and just sandwich it between the block and CPU? (of course, with the proper thermal adhesives, physical support, insulation, etc.)
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post #2 of 8
7/3/12 at 2:30pm
If you were able to mount it correctly and insulate the socket then you could use it. The reason people are making custom blocks with a TEC included is to regulate voltage and control temp more efficiently. The most important part of these blocks is the controller that cycles the TEC and keeps the temperature stable.

I am by no means an expert on the subject though.
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post #3 of 8
7/3/12 at 2:36pm
Majority of the time, a CPUs waterblock is focused on cooling the center of a CPU, which is where the Dies are located. When a TEC is to be cooled, it requires the ENTIRE surface area to be cooled equally; and also most CPU waterblocks are smaller than any TEC with some power behind it so there could be parts that are not being cooled, which will cause the TEC to have a shorter life.

Another problem with just sandwiching a TEC between the Waterblock and the CPU is that due to magnetic forces, a TEC is always trying to push itself apart, and requires, I think it was 150-300PSI to prevent these forces. Your motherboard can only take something like 75PSI. The reason you see waterblocks with a TEC integrated is because they're doing everything right.

They're cooling the hot side of a TEC with a waterblock the size of the TEC, the TEC is sandwiched between 150-300PSU, and the entire cold side is used to cool your CPU. That is another point, like the waterblock being too small for the TEC, the TEC will most likely be too big for your CPU, so you won't get the same efficiency as you would if you sandwiched it.

You can try to sandwich between Waterblock and CPU, but if your TEC is too big, the spots not cooled will get very hot and the solder inside will melt and cause the death of the TEC. Also the wires from your PSU, if you're using your computers PSU, will get hot with a draw greater than 4A.
Edited by Krow - 7/3/12 at 2:40pm
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post #4 of 8
7/3/12 at 8:33pm
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Thank you both for the advice. I'll have to look into these solutions. Maybe if I decide to grow into a bigger case I may do something with two separate loops, and actively cool the water in my loop with CPU and 2x GPU, and use a rad/fan combo to cool the loop that takes the exhaust heat from the peltier.
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post #5 of 8
7/4/12 at 12:25pm
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Almost everything here is inaccurate actually or just plain wrong.

TEC's do not produce a magnetic field that causes them to push apart.

They do not need HUNDREDS of PSI of mounting pressure


However, most waterblocks DO only cool the core, and the entire TEC must be cooled.
The point of the coldplate is to spread the heat from the CPU's IHS to the entire TEC. Else most of the heat would egress to the center of the TEC and make it less likely to handle the load.

More than likely you'd need a radiator upgrade as well to handle the extra load.

And it needs its own PSU to run properly. A controller is not necessary.
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post #6 of 8
7/4/12 at 2:06pm
I was just going by what has be stated over the years. And since no one had objected to certain comments, I remained uncorrected. So thanks for clarifying.
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post #7 of 8
7/8/12 at 11:40am
Quote:
Originally Posted by Krow View Post

Majority of the time, a CPUs waterblock is focused on cooling the center of a CPU, which is where the Dies are located. When a TEC is to be cooled, it requires the ENTIRE surface area to be cooled equally; and also most CPU waterblocks are smaller than any TEC with some power behind it so there could be parts that are not being cooled, which will cause the TEC to have a shorter life.
Another problem with just sandwiching a TEC between the Waterblock and the CPU is that due to magnetic forces, a TEC is always trying to push itself apart, and requires, I think it was 150-300PSI to prevent these forces. Your motherboard can only take something like 75PSI. The reason you see waterblocks with a TEC integrated is because they're doing everything right.
They're cooling the hot side of a TEC with a waterblock the size of the TEC, the TEC is sandwiched between 150-300PSU, and the entire cold side is used to cool your CPU. That is another point, like the waterblock being too small for the TEC, the TEC will most likely be too big for your CPU, so you won't get the same efficiency as you would if you sandwiched it.
You can try to sandwich between Waterblock and CPU, but if your TEC is too big, the spots not cooled will get very hot and the solder inside will melt and cause the death of the TEC. Also the wires from your PSU, if you're using your computers PSU, will get hot with a draw greater than 4A.

Quote:
Originally Posted by NoL View Post

Almost everything here is inaccurate actually or just plain wrong.
TEC's do not produce a magnetic field that causes them to push apart.
They do not need HUNDREDS of PSI of mounting pressure
However, most waterblocks DO only cool the core, and the entire TEC must be cooled.
The point of the coldplate is to spread the heat from the CPU's IHS to the entire TEC. Else most of the heat would egress to the center of the TEC and make it less likely to handle the load.
More than likely you'd need a radiator upgrade as well to handle the extra load.
And it needs its own PSU to run properly. A controller is not necessary.
Krow most likely mis-quoted someone that said 150 inch-pounds of torque, Can run off of PSU no problem as long as it is good quality and high enough rating. Controller is not totally needed but highly recommended, please do not throw stones at people in your glass house ! We are all human and as such are far from perfect. Keep your rigs cool. LOL
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post #8 of 8
7/8/12 at 2:34pm
Quote:
Quoted from http://www.overclock.net/t/855051/peltier-sandwich-has-this-been-tried#post_11160494 by zipdogso in 2010:

TECs will require at least twice this, with manufacturers recommending 150-300 p.s.i. This is necessary if you want the TECs to run properly.

Quote:
Quoted from http://www.overclock.net/t/212431/just-got-a-peltier#post_2445761 by ira-k in 2007:

...Its to small to cool a CPU..I have a 320W on a 150 Opty at 12V and it barely keeps me in the low teens OC'ed....150-300 psi is the best crush pressure...

Just wanted to prove I wasn't delivering just random "facts". I appreciate that I was corrected, as I do not want to spout falses. Thx for the back up gdesmo, but I was wrong lol.
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