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New Rig with 2x50mm tec chiller and controller 24/7 use - Page 2

post #11 of 22
Thread Starter 
Quote:
Originally Posted by xtremetechuk View Post
Thanks, the results are definitely interesting to say the least.

I'm actually planning on using two 480's in my TEC chiller setup. I'm still calculating the best percentage of Umax in regard to the amount of TEC's.

I'm choosing between 8*50mm CTE 245W at 5v or 6*50mm CTE 245W at 7.5v.
ya here is a few pics of my 480's external box build

http://www.overclock.net/water-cooli...tor-build.html
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post #12 of 22
Thread Starter 
here is another run with controller set at 15ºc I think I need to set the temp sending unit deeper into the water.. anyway results






Edited by lichking - 4/16/11 at 8:12pm
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post #13 of 22
Quote:
Originally Posted by lichking View Post
Here is a OCCT Log I just ran for you.. water temp was set to 5ºc on the controller.
Awesome, thanks for that.

Can you do another test for me please
  1. Download and install open hardware monitor
  2. Once installed, run it and under "view" in the top menu select "show plot"
  3. In the main window, check only the sensor(s) for your CPU temp(s).
  4. Set open hardware monitor to full screen
  5. Drag/expand the plot area to take up as much room as possible to easily show the ploted values
  6. Now set your TEC controller to a temp that is reachable under no load (ie. 10C)
  7. Now leave your PC at idle for 10 minutes
  8. After 10 minutes is up, take a screenshot of open hardware monitor (cropping everything else out is ok - just make sure the poltted data is viewable)
  9. Post the screenshot

Basically, that will test the temp control ability of your TEC controller

Quote:
Originally Posted by lichking View Post
I just want to inject that this is a build with the idea not to have to insulate the motherboard and have the chiller, controller all inside the case.
For sure mate, That's why I am keen to see the results of the test above - if your TEC controller can keep everything at a specific temp (ie. a couple degrees above the dew point) then that would be awesome

ATM I've not been able to use a TEC setup 24/7 on my rig because the TECs needed to keep my rig cool under load easily drop the temps under 0C with no load, and condensation kicks in like a mof

And that makes the whole TEC cooling idea useless for a 24/7 rig and only suitable for bench tests with everything insulated (for me at least, because I have nothing that can keep the chilled coolant above the dew point).

Quote:
Originally Posted by lichking View Post
Anyway on this test run ambient was about 24ºc and hot water temps peeked about 32º cold water was set at 5º via the controller..
How much radiator (and number of fans) are you using on the hotside? Sounds like you need more radiator *or more fans) lichking




Quote:
Originally Posted by xtremetechuk View Post
I'm actually planning on using two 480's in my TEC chiller setup...

...I'm choosing between 8*50mm CTE 245W at 5v or 6*50mm CTE 245W at 7.5v.
Don't forget to post hotside temps man - I'm also keen to see any results with differing radiator size/quanity.

I did a few tests over the last xmas break using 2x ebay "monster" TECs (lol, those 62mm china TECs) and at 12v to each I couldn't keep the hotside coolant at a stable temp at all, even with 2x 360 copper fin rads - it just kept on climbing while the CPU (AMD 965BE @ 4Ghz) was under 100% load.

Watching the open hardware monitor plot it was easy to see the plot trend going upwards every few minutes while running BOINC (like folding) on all 4 cores of the CPU.
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post #14 of 22
Yes, I have my doubts on whether or not two Phobya 480's can handle the heatload. I might use two Phobya 1080's instead, however this would increase the physical size, and I would like keep the chiller compact.

The two eBay 62mm TEC's at 12v with a Qc load of 200W, would produce a THL of around 800W. However 8*50mm CTE 245W at 5v with a Qc load of 200W, would produce a THL of around 500W.

In many cases, I think running multiple TEC's at 32-36% of Umax will outperform fewer TEC's at 64-68%. Not only in consumption but Tc temperature aswell. The heatload will be significantly reduced, and lead to lower Th temperatures...thus leading to lower Tc temperatures.
post #15 of 22
Thread Starter 
Quote:
Awesome, thanks for that.

Can you do another test for me please

Download and install open hardware monitor
Once installed, run it and under "view" in the top menu select "show plot"
In the main window, check only the sensor(s) for your CPU temp(s).
Set open hardware monitor to full screen
Drag/expand the plot area to take up as much room as possible to easily show the ploted values
Now set your TEC controller to a temp that is reachable under no load (ie. 10C)
Now leave your PC at idle for 10 minutes
After 10 minutes is up, take a screenshot of open hardware monitor (cropping everything else out is ok - just make sure the poltted data is viewable)
Post the screenshot


Basically, that will test the temp control ability of your TEC controller
I can see now I need to work on the software a bit to clean it up a bit. I just have the tecs turn off at the desired temp.. I'm going to put them at 50% duty cycle at temp and turn off at temp-1.. that should minimize the temp fluxuation.. Here is the initial graph anyway



Quote:
How much radiator (and number of fans) are you using on the hotside? Sounds like you need more radiator *or more fans) lichking
agreed.. I'm with xtreme that I was trying to keep it as compacts as possible.. I'm using two 480's atm.. I'm really considering maybe doing a watecooling bong for the hot loop.. that might be kinda interesting.
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post #16 of 22
Elloquins 4*50mm was holding an i7@4.2Ghz at 25-30C. I wonder how well your 2*50mm will cope once you start overclocking.
post #17 of 22
Thread Starter 
Quote:
Originally Posted by xtremetechuk View Post
Elloquins 4*50mm was holding an i7@4.2Ghz at 25-30C. I wonder how well your 2*50mm will cope once you start overclocking.
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post #18 of 22
Thread Starter 
Quote:
Originally Posted by un-nefer View Post
Awesome, thanks for that.

Can you do another test for me please
  1. Download and install open hardware monitor
  2. Once installed, run it and under "view" in the top menu select "show plot"
  3. In the main window, check only the sensor(s) for your CPU temp(s).
  4. Set open hardware monitor to full screen
  5. Drag/expand the plot area to take up as much room as possible to easily show the ploted values
  6. Now set your TEC controller to a temp that is reachable under no load (ie. 10C)
  7. Now leave your PC at idle for 10 minutes
  8. After 10 minutes is up, take a screenshot of open hardware monitor (cropping everything else out is ok - just make sure the poltted data is viewable)
  9. Post the screenshot

Basically, that will test the temp control ability of your TEC controller
@ Un-nerfer Here is another graph of the temp controller holding at 10ºc. I did some software tweeking in the controller..


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post #19 of 22
I'm assuming CPU temp is the red line or the light blue (cyan) line? If so, that's looking pretty good man.

Where is your TEC controller getting the tempertaure from? Is it measuring the coolant temp post CPU or pre CPU?
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post #20 of 22
Thread Starter 
Quote:
Originally Posted by un-nefer View Post
I'm assuming CPU temp is the red line or the light blue (cyan) line? If so, that's looking pretty good man.

Where is your TEC controller getting the tempertaure from? Is it measuring the coolant temp post CPU or pre CPU?

those lines are the 4 cores. One core runs a little hot, but some people have said the integrated vid can make that core run a bit hotter.

Temp sending unit is right after the chiller and before the pump..

chiller > sending unit > pump > cpu > chiller
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