Water as a PCM?

UselesKnoledge · Jul 27, 2003

Does anyone have any info on using water instead of freon in a phase change system, or any idea's on how to build this system?

I know there is systems that use ammonia, but I dont really feel like spending the money on aluminum. If I can't use water, then maybe something else that is non-harmful, cheap, and easy to obtain.

nealric · Jul 27, 2003

Well, you can do evaporitive cooling with a bong... Its basically a phase change reaction, but it wont get super cold- just a few degrees below ambient.

If you want really low temps, just stick with standard refrigerants. r404 (propane) and r134a are easily available and cheap.

I.M.O.G. · Jul 27, 2003

UselesKnoledge said:
Does anyone have any info on using water instead of freon in a phase change system, or any idea's on how to build this system?

I know there is systems that use ammonia, but I dont really feel like spending the money on aluminum. If I can't use water, then maybe something else that is non-harmful, cheap, and easy to obtain.

Water will freeze, that's why need to use standard refridgerants for phase changeing. If you want more information, you can find some at this site:

www.phase-change.com

Ciffer · Jul 27, 2003

can freon be bought anymore, i thought it was outlawed and replaced with puron

nealric · Jul 28, 2003

LOL, no

Freon has become just a generic name for a refrigerant.

R22 and R12 were prohibited because they are harmful to the ozone if they are ever released. However, they can still be bought with a lisence.

The replacement is R134a. It dosent perform quite as well as r12 and r22, but it works just fine. Almost all household refrigerators and acs today run on r134a.

Hydrocarbons are also used such as r404 (propane)- Its flammable, but works awesome in a phase change setup.

Ciffer · Jul 28, 2003

yeah, that is probably for the better

Paxmax · Jul 28, 2003

Melting ice is pretty safe.. as doc said "Poor mans phase change cooling". I would work out great if you work at, or, know someone at the local McDognutts store. Free ICE !

UselesKnoledge · Jul 28, 2003

I kind of like the R404 idea, thats pretty easy and cheap to get hold of. I just really dont feel like blowing my *** up.

I'm not too worried about the water freezing, I'm sure it can be worked around. I want to make some kind of closed water cooling system that will cool better than just running water through a heater core, or just sucking it through a bong.

I.M.O.G. · Jul 29, 2003

UselesKnoledge said:
I kind of like the R404 idea, thats pretty easy and cheap to get hold of. I just really dont feel like blowing my *** up.

I'm not too worried about the water freezing, I'm sure it can be worked around. I want to make some kind of closed water cooling system that will cool better than just running water through a heater core, or just sucking it through a bong.

If you are setting up a phase change cooling loop and intend to use water there is really only one somewhat reasonable way of doing this.

Submerge the cooling coils into a resevoir and use it as a chiller. Sometimes people often say that if you are going to do this however it only takes a bit more work to cool the CPU directly and not use water at all.

vonkaar · Jul 29, 2003

I would suggest that smokers not use a Propane based phase change system in conjunction with a bong.

Water as a PCM?

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