Building Phase change system

[whitehat_optix]

Does anyone have any ideas/plans for building a phase change system?
I am interested in building one, for about $300, I would just like some wise words before i go about doing so.

What coolant is the best? R134a, r12, R290?

How do I build a condenser block?

[UselesKnoledge]

I don't know anything about R290 but R134a is cheaper and much more safe than R12 if you have a leak. $300 seems a little steep for a phase change setup, just rip apart an old window unit A/C or fridge.

[johnnyw]

I am also looking for guides on how to make a phase change !! everyone says it´s tremendously easy but no one explains how to

[tgp]

phase-change.com has some breif tutorials.

should be less than 300$ too. way less.

r134a is probably the worst coolant (temp wise), but its one of the easiest to get and maybe cheapest next to r290

r12 is old and i dont know if you can even get it anymore. its also expensive.

r290 is propane. and you know how easy you can get that. its also dirt cheap. saw a 16oz can the other day for 4 bucks. youd only use a couple of ounces btw so do the math.

you dont build a condensor. you build the evaporator.
need to make it out of copper and know someoen who has a milling machine or at least a drill press. pretty much forget it if you think your gonna do it with a hand drill.

and you need to know how to solder/braze it all together.

laters.
t

[johnnyw]

tgp : everything very simple the way you narrate it , but is there any setp by step guide to build a phase change in the net??

[tgp]

nope.

this is close as your gonna get:
http://phase-change.com/index.php?action=Articles_page&cat=Guides&id=23&page=1