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Peltier + Corsair AX850

post #1 of 11
Thread Starter 
Guys,

I want connect 2 TECs in AX850 Corsair to have sure they are always on with the computer.

The TECs are TEC-12712 (15,4V @ 12A = 184,8W). I will use 12v @ 12A = 144W, the 8 pin PCI-EX (150W max) connector should be enough for each TEC.

The PCI-EX 8 pin diagram is:

1 - YELLOW +12V
2 - YELLOW +12V
3 - YELLOW +12V
4 - BLACK GROUND
5 - BLACK GROUND
6 - BLACK GROUND
7 - BLACK GROUND
8 - BLACK GROUND

I'll make a custom 8 pin PCI-EX female connector.

My doubt is, I should wire together the 3x +12V for positive and 5x GND for negative?

Thanks a lot!
post #2 of 11
im pretty sure that one of the pins on the 2 pin extension of the 6 pin is +12v i would check with a multimeter first before wiring up the peltier so you dont fry your PSU
post #3 of 11
Surprisingly enough, they really are both ground. The 8-pin only has two additional ground pins over the 6-pin.
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post #4 of 11
A 6 pin connector has 2 grounds 2 +12V, 1 sense and 1 not connected. With a 8 Pin you have 3 grounds, 3 +12V, and 2 sense. Sense 1 is the ground that is in the same row as the +12v and sense 0 is the ground above the middle +12V

In order for a PSU to let a pin connector to give the full 125W you must ground BOTH sense pins. If you only ground sense 0 then you only get 75W. If you only ground sense 1 the you have a non support confiuration and who knows what might happen (More than likely the PSU designer was lazy and only checks sense 1 so you will get 125W).

In the real would this equates to the pin have 3 +12v on a single rail. So you can tie them together without any ill effects. Though it is good to remember that a 6 pin connector doesn't require the middle +12V pin, and while it may have the same number of pins as a pin, most PSU's with over current will trip if you try and draw over 75 watts from just a 6pin.

Here is the Offical Pinout:
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post

Surprisingly enough, they really are both ground. The 8-pin only has two additional ground pins over the 6-pin.
Quote:
Originally Posted by ionstorm66 View Post

Here is the Offical Pinout:

Thanks for the help!

Once everything is ready, I'll post some pics.thumb.gif
post #6 of 11
Thread Starter 
After a long, long, long time... and a couple of house, jobs and PC changes, I finally have time to testing the peltier.

Yep ... are just 2x RAMs water blocks from my X99 build with 2x peltiers in between.





I put the guetto chiller after the second radiator and mount another loop in the botton (another D5 + Swiftech MC-320 and 3x ADDA 38mm Fans + Meanwell 320w power supply)

PS: Because it's a test, I use flex tubing with quick connects on the second loop to speed up.

At night, I post the results.
post #7 of 11
http://www.overclock.net/t/1522183/soundless-devil/780#post_25741031
Hey man might want to look at my build log. To Run peltiers chilling the water you need allot of radator and allot of peltiers running at half to a quarter of the maximum voltage
post #8 of 11
Thread Starter 
X71 Watercooler + Peltier Update!





When I started testing I noticed the wires got warm, so I shortened the wires there was a noticeable improvement from 265W to 304W on average ...

However, the result was a little disappointing because at full load I only got 2 to 3º C of reduction of temperature in the VGA and CPU, in IDLE the result is better almost 6º C.

Maybe I'm doing something wrong or what could I change to improve the results?
post #9 of 11
no it does not look like you have done anything wrong here at all.

look at this way your TEC's are producing about 300watts of cooling power and the PC system is producing about 300Watts of heat into the water system. the result is ambient or a little below like what you have.

to go colder a little insulation and add a couple more TEC's .

I am using 9 TEC's for my water chiller, and really I should have 12 TEC's. biggrin.gif
post #10 of 11
You have radiators in the cold loop right? This will limit your cold side temp to basically ambient as the radiators are trying to get the coolant as close to ambient as possible, when the coolant is above ambient they lower the temp, when it is below ambient they raise the temp, this is because the air flowing through the rads is ambient temp and is trying to get the rad/coolant to ambient temp, this negates most of the effect your chiller has.

Also, there are a few things you could improve other than removing the radiators from the cold side loop. Don't run the TEC's so close to Umax, ie 13.67v is 90% of Umax, typically with voltage this close to Umax the TEC is creating excessive heat compared with minimal increase in Qc over say you were running the TEC at 12v, which is about 80% of Umax.

Ideally TEC's should be chosen so that your voltage is no more than about 67.5% of Umax, 50-67.5% is a good range, and use more of them to get the Qc and delta you want as Toolmaker has said. I wouldn't go more than 75% Umax. These 12712 TEC's are not suitable for your needs if you want noticeable gains unless you use say 6 of them at about 7-10v. 199xx TEC's are 24v and would be more suited to your needs.

With these 2 x 12712 TEC's at 13.67v and 22amps (11amps each) you have a Qmax of 220w (110w each) ie you can handle a heat load of 220w and there will be zero difference in temp from hot side to cold side of TEC. Actually because of the thermal losses of the water block and the delta of the coolant on the hot side above ambient this situation usually results in lots of power being used and higher temps than plain water cooling. If your total heat load was more like 150w, you could theoretically get a 20*c delta from hot to cold side of TEC, but most of this delta is lost in reality to hot side coolant delta above ambient and thermal losses in the water block. What I'm saying is you want to chose TEC's that can handle your heat load with a theoretical delta of 30-40*c across the TEC, this way you have a bit of headroom for losses etc. You also want the best waterblocks you can find to limit thermal losses. and you want as much radiator space as possible on the hot side loop to keep the delta above ambient as low as possible.

Your RAM water blocks are ok for low powered devices like RAM which is about 10w, but for a serious chiller they are not very efficient. ie if you had a 220w heatload, and your TEC power consumption is 300w, that is 520w of heat to be transferred through a very basic water block, this will result in a temperature difference between the water block and the hot side coolant probably greater than 15-20*c. This is a thermal loss of about 0.028*c/w-0.038*c/w (ie for every watt of heat being transferred through this block there will be a temp difference of 0.028-0.038*c between the block and the coolant) this basically wastes the delta the TEC creates, or in this case where there is no delta because the heat load is at Qmax, results in an increase in temps over plain water cooling. You want to aim for water blocks that can handle the total heat load (ie CPU+GPU+TEC) and have a thermal loss of about 0.01-0.015*c/w and have enough radiator space to keep the hot side coolant about 5*c above ambient, 10*c above ambient is absolute max otherwise you are just wasting too much of the delta across the TEC.

If you wanted to get some nice temps you could get 4 more ram blocks, 4 more 12712 TEC's, run them in 3 x 2 TEC's wired in series, ie 2 tecs wired in series to your 14v meanwell will get ~7v each x 3 pairs. This distributes the heat load across more TEC's, which helps with the thermal losses of the water blocks, puts the TEC's in a very efficient voltage range lowering power consumption of each TEC, but still maintaining a decent possible delta across the TEC. Then remove all your rads from the cold side loop and add them to the hot side loop to keep your hot side coolant as close to ambient as possible.

I'm not sure what your heat load is or how far below ambient you want to go and if you want to deal with condensation etc but those are all things you need to consider when messing with TEC chillers.
Edited by LiamG6 - 3/26/17 at 8:56pm
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