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Old 30-11-17, 05:07 PM
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Carrock Carrock is offline
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Peltier cooling

Hi,

I know this forum is not popular, but I am hoping for some help anyway.
It maybe should be under the normal water cooling forum.

My work has a lot of cooling, which means I have access to some active cooling components. Amongst other stuff I have access to 2 peltier units that are left over from some discarded project.
I also have a water block and an air heatsink, which fits together nicely.

I am thinking that this could be added to a water loop, since the waterblock as fittings that fit 9 mm inner diameter tubing.

However I am curious about if the lower temp will affect the performance.

I would like to bring the temp down below 30, but above 20. Because going under 20 gives a chance for condensation.

The parts are:

2 x peltier elements
PN CP85438
http://www.cui.com/product/thermal-m...es/cp85-series
75W each, but should not go that high, as there is a danger to go over the limit, which will just make it heat instead of cool :P
I am hoping to not get above 100W in total.

1 x water block
PN: CP10G18
https://www.lytrondirect.com/cp10g18...plate/cp10g18/

1 x air block
PN: LA 10 300 24 V
http://www.fischerelektronik.de/web_...0_/index.xhtml
300 mm length

I am aware that using a peltier for cooling draws alot of watts from the wall.
I ran a test on a single peltier, without water, which yielded some results.
My quick math said rule of thumb of for each W cooled you need 2 W more for the peltier.

My idea for loop looks like this:

Pump/Res -> Radiator -> Peltier -> GPU/CPU -> repeat

This way most of the heat will be removed from the water, before it gets to the peltier, which takes alot of pressure of the peltier and bring the water down below room temp.

Anyone have an input?
Other than it being a very bad idea if you have economy in mind :P

Best

- Carrock

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  #2  
Old 30-11-17, 05:33 PM
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Wraith Wraith is offline
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How are you going to combat the condensation from the Peltier?
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Old 30-11-17, 05:51 PM
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Carrock Carrock is offline
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Quote:
Originally Posted by Wraith View Post
How are you going to combat the condensation from the Peltier?
Well I was thinking of having the actual peltier outside my PC case and in another case.

I would prefer it running on a separate PSU and it will make it easier to move.
If I get some quick connect fittings for the cases.

Keeping the water temperature just above 20 degrees should keep the hoses clear of any condensation.

I have still to make the control circuit for the peltier, but it should not be hard to make.
I have access to PCB programs and you can order PCB's online fairly cheap.

Best

- Carrock
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Old 30-11-17, 06:55 PM
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Wraith Wraith is offline
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Interesting, keep us updated with the progress.
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Old 01-12-17, 08:16 PM
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I had some other work that needed drilling, so I drilled the 4 holes for my setup.

It looks like , but I should work!



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