Peltier cooling

[ibmkg]

I want to cool my P4 with peltier. Thing is, the current WB I have has a round base similar to Intel Stock Heat Sink. I was wondering if I can use this WB to cool down this peltier:

http://www.virtualvillage.com/Items/...eltier%20Plate


The WB's round base area would be in contact with the center area of the peltier. The rest of the peltier will be exposed... Can this work?

I have not thaught of how to mount this peltier. I am thinking to mix AS5 and epoxy to glue WB and peltier together.

To avoid condensation, I will lower the voltage so that CPU remains in 25C range.

The water block: http://forums.procooling.com/vbb/att...1&d=1210745356

[billbartuska]

Originally Posted by ibmkg

I want to cool my P4 with peltier. Thing is, the current WB I have has a round base similar to Intel Stock Heat Sink. I was wondering if I can use this WB to cool down this peltier:

http://www.virtualvillage.com/Items/...eltier%20Plate


The WB's round base area would be in contact with the center area of the peltier. The rest of the peltier will be exposed... Can this work?

I have not thaught of how to mount this peltier. I am thinking to mix AS5 and epoxy to glue WB and peltier together.

To avoid condensation, I will lower the voltage so that CPU remains in 25C range.

The water block: http://forums.procooling.com/vbb/att...1&d=1210745356

You'll need a "Cold Plate" between the tec and the CPU to even out the temps.
You'll need to fabricate a mounting bracket too. Pelts need significantly more contact pressure than a typical heat sink.
Changing the peltier's voltage to avoid condensation will be tricky, since the heat load of the CPU changes constantly. To keep the CPU "in the 25'c range" the tec itself (and the cold plate) will have to be significantly cooler.

[ibmkg]

I have a 2mm Cu sheet that I can use for base plate.

What worries me is the contact area between peltier and WB. It is not much, I do not have a pic of my WB but see this pic for an idea:

http://www.frostytech.com/articleima...lpentD_bot.jpg

The WB I have has a round base contact area of about 28mm diameter.

The peltier is 40mm x 40mm.

[billbartuska]

I don't have an answer for that.

[ibmkg]

How to mount a peltier. The one I have does not have any mounting holes...

Maybe mix thermal paste with epoxy or silicon sealant?

[ben333]

No, the TEC has to be tightly pressed between two surfaces. Pretend you have a normal block and see here:

The peltier can be held with a LOT of pressure between the block and cold plate without crushing the CPU. You pretty much just mount the pelt very tightly to the block and then the block/pelt combo with normal pressure to the processor.

with your block's round base you will need a hot plate also. Two pieces of copper with the peltier sandwiched between them.

See this noobish mspaint example of how it can be done: http://ben.333networks.com/peltblockmount2.png

[Wil1948]

Iam using a rheostate, dimmer switch, could you tell me, how did you control the watts and volts.

[ibmkg]

Wil1948:

I never pelt cooled. Mostly becuase I never found it practical to my setup.

Your approach lowering amps is one way and the simplest. It will cause a lot of heat generation and thus power loss but the other way is PWM and that my friend will require effort unless you have cash to buy a pre built module for it.


For PWM my approach would be to use a microcontroller which will sense temp and lower or raise voltage accordingly. I might build such a thing in a few days for some other application.

[Wil1948]

Try this for a controler.
http://www.whatcircuits.com/store/dc...ere_LX033.html

[ibmkg]

wil1948:

That is a PWM controller, yes. I do not know your application but if you want to control temprature and voltage to control condensation (as I had planned and mentioned in my post) then that module won't be enough.

I think it is just a adjustable PWM controller, has a timer IC, and a transistor. What it does is lower or raise the voltage by turning the knob. There is no automation. It is WAY better than a simple adjustable resistor in series.

Be warned that they have mentioned 15amps max and pelts require much more constant current.

[Wil1948]

This PWM will handle more amps.

[url]http://www.whatcircuits.com/store/dcmotorcontrol-none-B000WYAN92-Electronic_DC_Motor_Speed_Controller_Device_Modula tor_30_Ampere_LX066.html[/url

Taping in to your power supply will allow you all the amps you need with over amp protection.

http://www.thermaltakeusa.com/Product.aspx?C=1245&ID=1512#Tab1

[Wil1948]

This is an easy solution to peltier cooling.

http://www.coolitsystems.com/index.p...&id=3&Itemid=5

It cost alot more but very cool.

http://www.coolitsystems.com/index.p...&id=3&Itemid=5

[Wil1948]

Here is a peltier co. that custom orders your peltier.

Check out the amps.

http://www.shop.customthermoelectric...2&productId=41

Try the sealed pelt.

[billbartuska]

CPU Pelt
VGA Pelt
Power supply