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Thermoelectric cooler - Page 3

post #21 of 33
that TEC probably doesnt have enough power to hold that CPU below ambient even if undervolted...
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post #22 of 33
the water cooling loop needs to be able to "handle" tec (in your case 130w) and the cpu (in your case 65w) so you would need a loop that can dissipate 130+65=195w (plus the small amount added in by the pump) just to make the tec break even (when i say break even i mean its like not having a tec) to get benefits from a tec you need a tec that has a higher wattage than your cpu (140w cpu tdp, get a 200w tec and a loop that can dissipate 200+140=340) so this is the way i understand it, im sure duckie is going to correct A LOT of things that i just said since hes more or less a genius
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post #23 of 33
Thread Starter 
if u came to my house and see the sit my dad has done u would laugh with just thermal **** lol its a mess but all works
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post #24 of 33
Thread Starter 
but before i do it im going to do the math with will be all done tomorrow and will post and just see what i come out with so ty for all the help
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post #25 of 33
Quote:
Originally Posted by Nvidia,XFX View Post
but before i do it im going to do the math with will be all done tomorrow and will post and just see what i come out with so ty for all the help


I'll move this thread under the TEC forum.

Hopefully, ultrasonic2 will be able to jump in and run the numbers for you.
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post #26 of 33
Oh dear, yeah this isn't going to work. First the Qmax, meaning the maximum amount of energy the TEC can move, is only 80.6 watts. At stock your CPU is 65w. So The TEC dumps about 130watts of heat with no Q addition. Q is the energy the TEC moves. With the 65w of Q that's 190w of heat that your H50 has to dissipate. Now the second problem Unless you are planning on using the TECs Vmax which is 16.1V not a Voltage that comes from any regular power supply it isn't going to move as much power. Lets say you used 12v that's about 75% of the input power and so your TECs Qmax will no longer be 80w, it's probably closer to a theoretical 75w. But to be safe we will say anywhere from 60-75w will be the new Qmax. The COP in this case would probably be nearing 1. That means for 1w of energy that is put into the TEC, 1w is also moved by the TEC. The heat load will be less but at the same time Dt and Qmax is less too. If the TEC cannot move all 65w of the CPU, it will cease to function well at all and instead of acting as an active cooler, it will act as a thermal insulator. So I would suggest trying to find a TEC larger than this. If you really want to do it, there's some danger of cooking your CPU, leaking water on your CPU, etc. So don't say you weren't warned.
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post #27 of 33
ok first thing . The TEC you posted is a 80 Qmax tec . This means it will move 80watts from one side to the other, and while doing so both sides of the TEC will be the same temp.
now if you apply 80 watts (CPU) to the TEC then there's no benefit in having the TEC

Actually you'll be far worse off with the TEC because now your water cooling system will need to dissipate the 80watts from the CPU and the 130watts the TEC is using. Meaning your water temps will be FAR higher than without the TEC meaning you'll get higher temps


To TEC cool you need 2 things

1 FAR FAR more Qmax than the load your trying to cooling. This is needed to ensure a delta between the 2 side of a TEC can be achieved with your heat load

2 AN awesome water cooling system. this is needed because the water cooling system needs to dissipate a significantly greater heat load. Even if you have a huge TEC that is achieving a large delta this delta can be MORE that lost when the water on the hot side increases past the delta the TEC is achieving


TECing IS NOT A CHEAP WAY TO GET BETTER TEMPS. It is a very expensive way to get better temps.


your money would be better spent on a new CPU and better water cooling
Edited by Ultrasonic2 (muffy) - 7/12/10 at 3:13am
post #28 of 33
Well, I'm guessing this didn't turn out well as he's not been on to tell us the results
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post #29 of 33
Quote:
Originally Posted by j0n3z3y View Post
Well, I'm guessing this didn't turn out well as he's not been on to tell us the results
Well im not sure what maths he was going to post. im sure it wasn't gonna have much to do with TEC's

Actually people posting snippets of formula seems to be all the rage. I wish life and TEC's were as simple as some would like it to be.
post #30 of 33
Quote:
Originally Posted by Ultrasonic2 (muffy) View Post
Well im not sure what maths he was going to post. im sure it wasn't gonna have much to do with TEC's

Actually people posting snippets of formula seems to be all the rage. I wish life and TEC's were as simple as some would like it to be.
lolrite! I can't quote them off the top of my head. But,that's ok. I know where to find them when I need them

The cooling system started to get complex enough (read: expensive), that it made me buy a window ac for a phase change system for the near future. Thankfully,I have a friend who is a micro machinest by trade.
Edited by j0n3z3y - 7/12/10 at 3:59am
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