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Foxrena's 4 TEC Water Chiller - Page 3

post #21 of 27
@Fox

Your quite right. In terms of power consumption; your results are very close US2's calculator. The 260W figure you say, would that be from the wall?

I'm quite astonished of how well the waterblock has performed, I wouldn't expect such a design to perform well! Regarding the temperatures. The CPU maxed out at 21C, with delta to water of 18.8C. So I'm right in saying water temperature was 2.2C? Or have I misinterpreted the results?

I don't have the time for TEC's anymore; well not with college and a-levels to study. Unless I find a decent CNC service; I have a lovely sheet of copper 10mm thick doing absolutely nothing! I should really send it to Crabid or Zipdogso, and be put to good use. biggrin.gif
post #22 of 27
Thread Starter 
Quote:
Originally Posted by xtremetechuk View Post
@Fox
Your quite right. In terms of power consumption; your results are very close US2's calculator. The 260W figure you say, would that be from the wall?
Yes, the 260W is from the wall. I used a wattage meter. The wattage does scale linearly with PWM %.

Quote:
Originally Posted by xtremetechuk View Post
I'm quite astonished of how well the waterblock has performed, I wouldn't expect such a design to perform well! Regarding the temperatures. The CPU maxed out at 21C, with delta to water of 18.8C. So I'm right in saying water temperature was 2.2C? Or have I misinterpreted the results?
In the results I posted, the values of core temp is read from AMD CPU core sensors, which every AMD users know is inaccurate for the absolute value. I usually add 10C or 15C on that.

The core temp difference (between TEC and straight water system) still makes sense though.

The WaterT at 18.8, is the cold loop water temperature (water running through the CPU block). This should be the most important number in the graph.

Quote:
Originally Posted by xtremetechuk View Post
I don't have the time for TEC's anymore; well not with college and a-levels to study. Unless I find a decent CNC service; I have a lovely sheet of copper 10mm thick doing absolutely nothing! I should really send it to Crabid or Zipdogso, and be put to good use.
yeah...CNC is quite expensive in my place too. That's why I made it by myself. It did cost a lot of money and time... But a lot of fun. I'm very happy with it.
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post #23 of 27
Quote:
Originally Posted by foxrena View Post
To be clear I'm using Ebay 400W TECs, I believe the specs you show is from Customthermoelectric. I also thought they are basically the same until now
What you have to remember is TEC's are electronics, manufactured individually on the same line...not all TEC's are the same, even neighbours on the manufacturing line. Like CPU's and most other HQ components, TEC's are binned based on their size and resisitance, there is a fair bit of leeway in the set parameters. Customthermoelectrics are a reputable manufacturer and will have tighter binning and for extra charge will grade the TEC's sent to you. Whether this is neccessary or acceptable (from cost POV) is down to the purchaser.
Ebay TEC's are budget in the main they MIGHT be bin rejects or maybe just simply unbinned, that would explain why not all Ebay TEC's are carp.
That said I think the general consensus that you get what you pay for prevails.

Certainly when using multiple TEC's in a project it is pretty damn near impossible to get them all working the same, certainly it will be highly unlikely the resistances match unless you have requested, and paid for, matching units. So when using results from the whole project there will be a discrepancy.
It is worth noting here the importance of correct pressue on the TEC's, as you tighten the TEC's down you compress the material in the TEC's, this alters the resistance of the material. It is important to stay within the recommended torque to increase the chance of the TEC performing like the performance charts. With that one can probably see why it is considered good practice to get TEC's milled to the same depth when they under a common hotplate. But again performance gains are debatable and down to personal choice.
post #24 of 27
Thread Starter 
Quote:
Originally Posted by zipdogso View Post
What you have to remember is TEC's are electronics, manufactured individually on the same line...not all TEC's are the same, even neighbours on the manufacturing line. Like CPU's and most other HQ components, TEC's are binned based on their size and resisitance, there is a fair bit of leeway in the set parameters. Customthermoelectrics are a reputable manufacturer and will have tighter binning and for extra charge will grade the TEC's sent to you. Whether this is neccessary or acceptable (from cost POV) is down to the purchaser.
Ebay TEC's are budget in the main they MIGHT be bin rejects or maybe just simply unbinned, that would explain why not all Ebay TEC's are carp.
That said I think the general consensus that you get what you pay for prevails.

Certainly when using multiple TEC's in a project it is pretty damn near impossible to get them all working the same, certainly it will be highly unlikely the resistances match unless you have requested, and paid for, matching units. So when using results from the whole project there will be a discrepancy.
It is worth noting here the importance of correct pressue on the TEC's, as you tighten the TEC's down you compress the material in the TEC's, this alters the resistance of the material. It is important to stay within the recommended torque to increase the chance of the TEC performing like the performance charts. With that one can probably see why it is considered good practice to get TEC's milled to the same depth when they under a common hotplate. But again performance gains are debatable and down to personal choice.
Very informative and I can't agree more.
For my chiller I wasn't able to machine a perfect flat surfaces for the TECs, so the pressure issues you mentioned certainly exist.
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post #25 of 27
foxrena you have inspired me to start my tec project here is what i have so far.
Attachment 231812
I don't have mill or a bench drill. So i used a trim router and assorted hand tools.
tec
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post #26 of 27
Thread Starter 
Quote:
Originally Posted by prototype990 View Post
foxrena you have inspired me to start my tec project here is what i have so far.
Attachment 231812
I don't have mill or a bench drill. So i used a trim router and assorted hand tools.
That's quite impressive, man! I'm not brave enough to process copper like that
Did you carve the water channel with hand tools?
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post #27 of 27
i did the water channels with a dremel tool and a straight edge. i will start my own tread soon as its finished with more details as i don't want to hijack yours.
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