Liquid CO2 cooling?

[CreePinG_DeatH]

Anyone know how cold liquid carbon dioxide gets? I know it's not as cold as freon or anything, but it is rather abundant. It's not as dangerous if there is a leak either right?

[macci]

I don't think there is such thing as "liquid C02" :)

It's either solid (dryice, -79°C) or gas.

[CreePinG_DeatH]

well that sucks. I just assumed there was. I had a paintball air canister charged with co2 and the o-ring broke so all the air decompressed rather quickly and the entire outside of the bottle froze my hand to it. And it's not thin aluminum or anything it was 440 stainless steel. rather thick too. Can compressed co2 just do this?

[Koooler King]

liquid CO2 exists only under very special pressue and tempurature conditions ... not a really good choice in any case, even for extreme cooling, whether solid or liquid unless the need requires it. Industy is working on A/C systems that use CO2, but the pressures involved are so extreme that it is not a good fit for normal or industrial e-cooling. It can be done, but the components are so heavy duty and expensive, it does not make sense in an "Earth" environment. Good luck!

Koooler KIng

[Silversinksam]

Originally posted by macci
I don't think there is such thing as "liquid C02" :)

It's either solid (dryice, -79°C) or gas.


Hey Macci,

Glad you decided to drop by. For those that don't know Macci he is my Video card Guru and a helluva nice guy that helped me several times.

Macci.....When I first saw this pic of the World Record CPU in the post above, I thought you were up to your old tricks again. :)

Didn't you deep freeze your Radeon:p

[macci]

Hello Sam :)

And yes the Raddy had been deep frozen :) 380MHz GPU so far..
Might try some ln2 cooling there soon and aim for 400MHz :D

[Teacher_Doug]

originally posted by the Kooler King

liquid CO2 exists only under very special pressue and tempurature conditions

Completely agree. Liquid CO2 is one of the weirder liquids. It is liquid at high pressure (about 100 -200 bar) and room temp.(like inside a paintball canister, or fire extinguisher) or at a low temperature
(-40 to -70C) with a medium pressure around 4 bar.

If you look at a phase diagram its almost piccaso .

There was an accident in germany, when some dumkopf let the pressure out of a refrigerated CO2 vessel. This thing held about 20 tonnes of CO2. To keep it liquid, there nust always be some pressure acting on the CO2, even if it is refrigerated. Anyway, this guy let the pressure drop too quick, and the whole 20 tonnes of CO2, which was being used to put some fizz in beer, turned into 20 tonnes of dry ice...no CO2 gas, no fizz, no beer.
Because the tank was super insulated (to help keep the CO2 liquid), it took about 3 months for all the dry ice to sublimate back to gas.

[Yakbak]

http://www.muropaketti.com/artikkelit/cpu/northwood2200/ln2/

Those guys had fun...:D

[res0r9lm]

Originally posted by CreePinG_DeatH
Anyone know how cold liquid carbon dioxide gets? I know it's not as cold as freon or anything, but it is rather abundant. It's not as dangerous if there is a leak either right?

boiling point is -195 it's still dangerous if you have a leak though. I think you would need a cascade system. It is used in cyrogenics in place Ln2

[JFettig]

Originally posted by Silversinksam



Macci.....When I first saw this pic of the World Record CPU in the post above, I thought you were up to your old tricks again. :)



world record cpu? were? linkage!!! the WWW doesnt work....

[Mr. $T$]

dumkopf is german for dumb head for all the non speaking german type people.


CO2 must be kept at a certain temp or pressure(mm Hg) to stay liquid.

[CreePinG_DeatH]

jesus res- what the hell made you bring up this old thread? lol... I mean I kinda moved on once I started getting into propane cooling.

[res0r9lm]

Originally posted by Mr. $T$
dumkopf is german for dumb head for all the non speaking german type people.


CO2 must be kept at a certain temp or pressure(mm Hg) to stay liquid.
thats what I thought and why you would need a cascade system or a one screw type compressor. seem to complicated to me.

[res0r9lm]

Originally posted by CreePinG_DeatH
jesus res- what the hell made you bring up this old thread? lol... I mean I kinda moved on once I started getting into propane cooling.
courisity, I was wondering if you use 2 compressors in series with co2, oh well seem to much of a pain