Phase change chiller, unique, must see

[m0tion]

Custom phase change setup - Setup I used to run a chill a 1/3 methanol 2/3 water loop. Works great, uses R22, fluid temps
get down to about -30C. Custom evap coils are made of about 16 feet of 1/4" copper
refridgeration tubing. Shown here with a Comair Rotron 10" fan. Looking to go chilled fluid? This will get you cold QUICK! Just submerge the evaporator coils in a resevoir full of your favorite coolant you you'll be good to go.


http://www.cse.sc.edu/~wigginjs/phasechange1.jpg

http://www.cse.sc.edu/~wigginjs/phasechange2.jpg

[BBQ-J]

how much u want for it?

[m0tion]

$75 shipped without the fan.

[tripodal]

i wanna see i wanna see
the pic links are dead

[m0tion]

sorry, fixed.

[tripodal]

very sweet . you made that yourself?

[m0tion]

umm, yup..

[tripodal]

what is the lowest achieveable temp for R type coolants?

[m0tion]

Hmm, research that question a little more and you'll find it doesn't make much sense.

[tripodal]

oh so im supposed to figure it out myself? ic ...
i know there is a specific boiling point for all such coolants. maybe thats what i was suposed to ask. obviously they can only cool down to thier boiling point. at that point they cannot be compressed anymore. and that would be the lowest temp.

[Player0]

Hi trip, I think its like -40c for most stuff readily available. Somewhere in there.

[m0tion]

Well, there are lots of refridgerants that have been given an R-#, but they vary so greatly it's really impossible to answer your question without first knowing how you'll be using it. For your more common ones (R-134A, R22, R12, R290) it's probably going to be somewhere between -15C and -40C depending on how they're implemented. I didn't intend my original reply to be condensending, but after re-reading it I suppose it was. You can do some google searchs and find the information you'd like to know about refridgerants, just keep in mind that you probably won't be using the vast majority of them in a home-made unit. I've found that if you live in the US and don't have an EPA license or have a friend that does your options basically scale down to R134A(-26.1C) and R290(-41.2C) =). Boiling points shown are at 1 atmosphere. It's also important to take into account a refridgerants molecular wieght when looking at cooling efficiency, higher molecular wieght refridgerants will be able to carry more heat.

[tripodal]

thanks a bunch. thats exactly what i was wondering about.
how much heat do you suppose your cooler can move? did you ever try it with a pelt?

[m0tion]

I don't know and no. I have no doubt in my mind it will be able to remove the 300W+ you'd be throwing at it with an overclocked CPU and a good sized TEC, but as for how much heat total it can remove I have no idea. Generally these things scale, you put x amount of load on it, you get x temperature. The more load you put, the higher your temperature. Guaranteed this thing will cool the cpu + tec below -10C no problem, most likely much lower.

[tripodal]

interesting.... how difficult would it be to make another?

[m0tion]

I've seen case mods that were more complicated =). The real problem is that parts are expensive, thats why it's a good idea to rob them from old air-conditioners/refridgerators.