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[Build log] New dual 50mm TEC block

post #1 of 59
Thread Starter 
Hi guys,
I am going to make a new dual 50mm TEC block! I will apply what I have learned and try to make it as good as possible.

Features:
0.02'' Microfins
Split flow design
fly-cut surfaces to ensure good contact
Acrylic top plate art engraving
Machined Aluminum hold down bracket
....

I am still working on the design, feel free to suggest new ideas smile.gif

-Fox
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post #2 of 59
Thread Starter 

Update Feb 26, 2014

It has been a long time since last update. But the block is ready! Test results coming soon.

























Here are the test results.

The block has two CTE 31.5V 17A Qmax 331W peltiers, working in parallel. Tests are done on a delid 4770K overclocked to 4.8GHz @1.4V Vcore. I use prime95 default blend for stress test.
I have thermal probes at the water inlet, hot plate and cold plate, as well as back of motherboard. You can see these temps in my TEC monitoring software below. What matters most in the test is the temperature difference (DT) between water and cold plate, as shown by W-C in the monitoring software. The blue curve shows how cold plate temperature changes versus time (in minutes). My radiators fans are controlled by on-off algorithm, that's why my water temps fluctuates by about half degrees.

TECs at 7V 8.8A:
Idle:

Load:


TECs at 12V 14A:
Idle:

Load:


TECs at 20V 25A:
Idle:

Load:


Summary:

Here you can clearly see the efficient power range of the TECs.

Lastly a Cinebench run at 5.1Ghz 1.5V showing how well the block holds during short benching run. You can clearly see cold plate temp spikes from -25C to -12C during benching.

Because the larger mass of cold plate and Qmax of dual TECs, this block holds much better than the single TEC block during Cinebench run.
Overall I'm very satisfied with the results.

Edited by foxrena - 2/28/14 at 9:01pm
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post #3 of 59
Here's what I'll be using for my dual 50 blocks, looking forward to your custom work. >>>
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post #4 of 59
Nice, cant wait to see em!
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post #5 of 59
Thread Starter 
Quote:
Originally Posted by gdesmo View Post

Here's what I'll be using for my dual 50 blocks, looking forward to your custom work. >>> Warning: Spoiler! (Click to show)


Good looking chiller plates! I love the ground finish. It's the best way to ensure flatness thumb.gif
Quote:
Originally Posted by Puck View Post

Nice, cant wait to see em!

Working on the modelling now. Pictures coming tomorrow.biggrin.gif
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post #6 of 59
Quote:
Originally Posted by foxrena View Post

Hi guys,
I am going to make a new dual 50mm TEC block! I will apply what I have learned and try to make it as good as possible.

Features:
0.02'' Microfins
Split flow design
fly-cut surfaces to ensure good contact
Acrylic top plate art engraving
Machined Aluminum hold down bracket
....

I am still working on the design, feel free to suggest new ideas smile.gif

-Fox

:O

Which TECs are you using? You should be able to get some pretty ridiculously low temps with two 2 50mms, assuming you could get the coldplate figured out properly.
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post #7 of 59
Was thinking about it and saw that you are going with a 20 thou microfin structure, be careful with your feed speed so that the copper does not run into any galling issues. Damn copper is harder to machine because of it's softness, also how deep do you plan on making the fins ? I'm sure you know this, but throwing it out so people know. Waiting to see your plans ! cheers.gif
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post #8 of 59
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

:O

Which TECs are you using? You should be able to get some pretty ridiculously low temps with two 2 50mms, assuming you could get the coldplate figured out properly.

I will probably use two 331W Qmax 50mm TECs. It should be over kill for a quad core processor. So I'm aiming for a big overclock and >30C DT cold plate to water.
Quote:
Originally Posted by gdesmo View Post

Was thinking about it and saw that you are going with a 20 thou microfin structure, be careful with your feed speed so that the copper does not run into any galling issues. Damn copper is harder to machine because of it's softness, also how deep do you plan on making the fins ? I'm sure you know this, but throwing it out so people know. Waiting to see your plans ! cheers.gif

Yeah pure copper is damn difficult to cut!! Copper 110 and 101 machinability rating is only 20%. It easily gums up and leaves bad edges. My mini mill lacks rigidity so I have to pay extra attention to reduce machine load. In my case using very sharp cutter, lowering cutter RPM and using cutting oil helps. I didn't have any problem with 32 thou fins, but smaller than 20 thou fins can be easily pushed around when machining. I need to use a lot of coolant and lower my feed rate to about 0.5 inch per minute. I have tested maximum 0.07'' depth with 0.02'' saw, and 0.04'' depth with 0.012'' saw in one pass. Hope that could help smile.gif
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post #9 of 59
Thread Starter 
Here is my design. The Cold plate is 1/2'' thick, hot plate is 1/4 thick and acrylic/aluminum tops are all together 3/4'' thick. Input flow is injected into the center of the hot plate then split to left and right. That way the hottest area of the hot plate should get good cooling. I will measure the C/W performance of the hotplate once it's made.

Copper cold plate:


Copper hot plate:


Acrylic Injection plate:


Acrylic Top:



Top Aluminum hold down :

Edited by foxrena - 7/29/13 at 7:52pm
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post #10 of 59
Sweet !!! thumb.gif
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