Peltier no work?

InfamousHindu · May 8, 2003

K, i just hooked up my peltier to my computer and i hooked it up to 2 PSU's in parellel using the 12volt lines from each PSU. I hooked up everyting correctly with a copper plate, but i get a temp reading of 34C on idle(thaz what my basic watercooling gave me). Well, i took it off, and then just powered it up with my waterblock on it just to see how cold it gets, and it gets pretty cold, i think somewhere between 0 and -2C. So, how come it isn't cooling my CPU that well?

NiTrO bOiE · May 8, 2003

Do you have a coldplate? If you do, is the coldplate making good contact on the CPU?

InfamousHindu · May 9, 2003

Since87 · May 9, 2003

I've heard of cases with a P4 where the temperature measurement barely moved even when chilled water was used. Bad CPU temp measurement may be the problem.

Otherwise, it's likely the problem is an inadequate water cooling system.

What is your watercooling system composed of?

Do you know the temperature of your water?

Punkmasterflick · May 9, 2003

Or... you simply don't have a strong enough tec.

do you know the wattage of that tec?

InfamousHindu · May 9, 2003

its a 226W peltier, the water block gets extreme hott but the water coming out of the radiator is bout room temp. 68F

Since87 · May 9, 2003

InfamousHindu said:
its a 226W peltier, the water block gets extreme hott but the water coming out of the radiator is bout room temp. 68F

Hmm. You do know that you want the water that is flowing through the radiator to also flow through your waterblock, right?

Your statement doesn't make much sense. If your water is at 68F, then the parts of your waterblock that you can touch are likely to be about 68F also.

What waterblock, pump and rad are you using? (I asked this before. If you really want people to help you with your problems, you need to answer their questions.)

InfamousHindu · May 9, 2003

Sorry about that, i didn't clearly read the questions, i meant that the water coming out of the radiator is about 78-85F and the radiator is from the Aquarius2(swapped the fan with a 76CFM) and the waterblock is the on from the Aquarius2 and the pump is one from xoxide(http://xoxide.com/rapu.html). My setup goes like this, Pump--->Block---->Radiator---->back to the pump.

Colin · May 9, 2003

Sounds like the coldplate is not making proper contact with your CPU. You may want to reseat your block.

Since87 · May 9, 2003

Ahhh.

Sorry to say, but that's not nearly good enough watercooling to be able to get good results with a 226 Watt TEC.

As a start, you should at least replace that radiator with a heatercore and 120mm fan.

Voodoo_fx · May 9, 2003

I don't think that Thermaltake waterblock is made for this stuff man.. you may want to get a new WB and a heatercore at autozone or something for like 20 bucks.. get an Escort if you want, there a good size, and get a nice waterblock, something with a ton of surface area, if push comes to shove I have a copper block that has a 1/2 in and two 3/8 outlets that I had made at a machine shop.. if im understanding correctly what you wrote i believe that may be your problem.. good luck though, just becarefull, if you don't think its running right up hook it.

InfamousHindu · May 10, 2003

Should i replace the radiator frist of the waterblock, i was thinking the waterblock because the radiator is a pure copper radiator.

Since87 · May 10, 2003

Both really need to be replaced. I suggested the radiator first because it is cheaper. You can pick up a Chevette heatercore for around $20.

The rad you have may be all copper, but surface area is the biggest factor when it comes to radiators.

Really though, the whole watercooling system should be replaced, because of the small tubing size. I'd suggest going with a 1/2" system all the way around.

Colin · May 10, 2003

Wait a minute... A CPU temp 34C over the temp of the coldplate indicates the coldplate is not making proper contact with the CPU.

Since87 · May 10, 2003

Colin said:
Wait a minute... A CPU temp 34C over the temp of the coldplate indicates the coldplate is not making proper contact with the CPU.

I don't see where he said the CPU was 34C above the coldplate temperature.

I do see where he's saying that the TEC/WC setup got down to about 0C with no heatload. (i.e. not mounted on the CPU)

Actually, the fact that the setup with no heatload only got down to about 0C, is a pretty good indication that the watercooling needs serious work.

Colin · May 10, 2003

Since87 said:
I don't see where he said the CPU was 34C above the coldplate temperature.

I do see where he's saying that the TEC/WC setup got down to about 0C with no heatload. (i.e. not mounted on the CPU)

Actually, the fact that the setup with no heatload only got down to about 0C, is a pretty good indication that the watercooling needs serious work.

Ok, I'll put it this way. An idle temp of 34 to 36C above the unloaded coldplate temp indicates there is a problem with the coldplate/cpu interface.

While I agree this block and radiator are not going to provide optimum results with a 226 watt pelt, the results are sub par for the equipement used. In addition to poor coldplate contact with the CPU, I suspect there is not enough pressure on the pelt between the coldplate and the waterblock.

Since87 · May 10, 2003

Colin said:
While I agree this block and radiator are not going to provide optimum results with a 226 watt pelt, the results are sub par for the equipement used. In addition to poor coldplate contact with the CPU, I suspect there is not enough pressure on the pelt between the coldplate and the waterblock.

Yes, quite likely all of the above are issues.

InfamousHindu · May 11, 2003

how can i know if the cpu is making proper contact with the cold plate, cause i don wanna over tighten it.

InfamousHindu · May 11, 2003

because i've tighten it quite a bit but if u say there isn't sufficient contact, then how do i know

Colin · May 11, 2003

Take it off and check the contact patch on the coldplate. FWIW, it takes me about five mounts on average to find the best one, and that's just with a heatsink. Pelt systems with neoprene insulation around the ZIF socket often make it even more difficult.

Peltier no work?

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