CPU power and TEC equations

[yoda]

A few years ago I got into using tecs and had all the equations in an excell spread sheet ect... unfortunatly I lost them...
basically, I have a P4 nortwood I think, but non HT (x86 family 15 model 2 stepping 9 genuineintel ~2660Mhz)

My CPU is water cooled but I want colder...
Aparently my CPU is 82.2W....
I'm lookin for the tec equations now....

Whats the best way of 'frost' proofing the socket?
Is their any easy way of automatically controling how much power the tec uses?

This is allmost my curent PC setup....

yes ok, it in an xblade case....

 

[yoda]

I just orderd a tec of a well known bidding site...

At 50°C it consumes 10.5 amps @ 17.4v giving a ferocious consumption of 182.7w (0.183Kw). At 25°C it gobbles up 10.5 amps @ 15.2v = 159.6 (0.16kw). It's pumping power or Qcmax is equally phenomenal @ 50°C being rated at a healthy 96w, equally as impressive @ 25°C it's Qcmax is 85w.

This TEC has 127 couples and a resistance of 1.24 ohm @ 50°C and 1.08 ohm @ 25°C. It's ΔT N2 @ 50°C is a very respectable 75°C and 66°C @ 25°C. And Finally it's voltage range is 0 - 15.2v @ 25°C and 0 - 17.4v @ 25°C, and it's leads are AWG 16 Teflon and approx. 6 inches (15cm) in length.

I've got the equations... I'm going to drop them into an excel spread sheet... but by the looks of it I'm going to dump upto 200W of heat into my water cooling rig ... (starts whistling)

Also, the 'guidelines' reccomend that you DONT cycle the power to control the temps so that means usin a variable voltage regulator...

I've allready got a cold plate... all I need to do now is polish the cold plate and figure out how to bolt this lot together and onto my CPU/mobo...

 

[Amonlym]

my tec-fu isnt exactly nop notch, but i think that tec is far far to low powered to cool your cpu effectively.

take care (start with an underclock/volted cpu and work up to stock then oc)

 

[drunkenmaster]

its 10.5amps right, so at 12v it would use 126W or are you going to be using a separate power supply? anyway, thats how much power it uses, as it shows you don't get that much cooling, if its only giving 85W cooling at 15v, then you're getting less cooling power at 12v than your cpu is giving out. it will not cool your cpu at 12v possibly at all let alone well.

to get sub zero temps, even sub ambient temps you'd need a massively more powerful TEC. something pumping out, honestly haven't looked into it in ages and can't remember, but i'd guess to even get cpu sub ambient temps you'd be looking at 226W tec, but probably even higher. the 80W tec's in gpu blocks were only working well when the gpu's were putting our 40-50W and even then not that well. you need a big overhead.


the money would be much better off spent on a 775 board, cheapest you can get and any low end cheap dual core.

also at minimum, if you're cooling both the 140W of the tec and 80W for the CPU, even more when overclocked then you're dumping more than 200W into a very small rad. its just a bad idea all around.

 

[yoda]

small rad.... it's 120mm
most of the time I leave the 120mm fan on idle... and my CPU barely goes above 40C... turn it upto full and my CPU is 30-35C

the TEC has arived... I went for this one because it is just above the 'supposed' heat output of my CPU. I wanna see if my water cooling system can handle it first....

and later on, if I decide to get a more powerfull tec I can use this one on my gfx card.... it should be powerfull enough to freeze the GPU

Besides, I'm having fun freezing my fingers....

But yes, I know what you mean about the 12V/15V... I'm looking into it... I allready worked it out yesterday...

The alternate would be to buy a second tec and put them in paralelle...