yeah....I have

dry ice

 

ohh forgot to mention.. i meant in a closed loop system

using liquid CO2 to cool it, and compressors to compress the gas back to liquid form

 

Quote:

Originally Posted by r34p3rex ohh forgot to mention.. i meant in a closed loop system using liquid CO2 to cool it, and compressors to compress the gas back to liquid form

oh...in that case no...lol.

sound very elaborate though.

 

I think in some systems they have used CO2 but I dont know of the characteristics of that gas as compared to other refrigerants. I dontthink it performs as well but could be wrong.

 

yeah..more than likely, CO2 is used because of the small heat load a fridge has to deal with..it only needs to cool occasionally, as food, etc does not continually produce heat.

The fridges can probably use a small compressor, and the system is not only environmentally safe, but very low cost to refill.

..a cpu is not a fridge. It needs much more to keep it cool, especially something like a highly OC'd Quad core..you could be talking about a 200W heat load, or even higher. With trying to keep your temps to a minimum, you would need something capable of dissipating much more.

 

the fridge my place uses is HUGE haha its supplied CO2 by a tank thats at least 3 feet tall and a foot in diameter..

the fridge itself is around 9 feet tall..

seems like something i may try when i get some free time

 

you dont get it though.... the things you put in a fridge do not continually produce heat. Even a fridge of that size would be affected by a constant heat source.

 

well it sounds to me that it is possible, the biggest minus point i see is that you'll have to get a rather powerfull compressor to get it cooldown that much again, since like the man above me said, a fridge needs to keep stuff at 1 temp all the time, and occasionaly needs work it's way up again, but that doesn't go in an instant it takes some time.

while cooling you CPU you don't have as much time to get the CO2 to it's low temp as you do with the fridge, and the CPU will process ALOT of heat more then you can put in your fridge (in matter or terms ofcourse).

i think it is possible but that the compressor needs to be more powerfull then the one in that fridge, and that will come at a price.

 

You could always run a coil into another container with water or whatever. I was thinking easy acess with a plug at the bottom for draining old fluid and a lid up top for new. It would take the hassle out of bleeding lines and would greatly reduce the risk of spilling anything on or in the pc during fluid changes.

 

next time i go there.. i'm gonna ask the professor in my lab if i can use the top shelf to place a few 100watt light bulbs inside and see the results

.. they only use the bottom 3 shelves anyway

 

Quote:

next time i go there.. i'm gonna ask the professor in my lab if i can use the top shelf to place a few 100watt light bulbs inside and see the results .. they only use the bottom 3 shelves anyway

Good 'heat-load' test.

post back some results

 

only problem i can see is that c02 will turn into liquid around 870psi(60bar) where common coolants in standard cooling systems condense around the 300psi(20bar) compressor that can do that with adequate flow will cost a pretty penny but it does cool much better than standard coolants so if you can do it then it will get the job done. could cool an oc'd server farm with it probably

 

I Am The Only M'sia Fella Around?! This Forum Must Suk For Non-english Users

 

Quote:

Originally Posted by r34p3rex Has anyone ever attempted CO2 cooling? the lab where i do my research in uses CO2 cooling for its fridges to keep them at -70C constantly and i was wondering if it would be feasible to set up a phase change type system using CO2 instead of R404a/R507 edit: i meant liquid CO2 - in a closed loop system (liquid co2 onto the processor -> boils -> compressor compresses CO2 gas back into liquid -> repeat)

Hey Just to let you know im am in the first stage of a prototype co2 cpu cooling system, it is NOT Closed circuit though, i have a series of copper tubing running though the cpu heat sink and a paintball co2 bottle with a value to purge the system

 

We use Co2 in the HVAC industry all the time. To properly condense it though at a normalized pressure you have a decent feat. Around -25C will do at 15bar, and the cooling effect needs alot more work to be controlled to avoid the dry ice effect that is common with Co2.
Normally you won't see it out of cascading or autocascading systems.
The systems now being implemented with them in single stage configurations are very costly or very high pressure (which is not cost effective with constant upkeep and all that).