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Originally Posted by redleader
Yes its been done. Making a case air tight and then chilling the air on the inside is one way to reduce condensation on multiphase cascade systems. My opinion is that its rather pointless if you're operateing well below -100C. Above that insulation is a more elegant solution (IMO of course).
Other then that your idea is pretty solid. AIM for a high heatload (couple hundred watts) when you size the cap tube so that you don't have to wait forever for the coolant to pull down, even if it makes the temps a bit higher.
What refrigerant are you thinking of? R-22 or R-404 would be great if you can get them.
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I'll probably use R-12. My boss has a couple bottles stashed away, for the classic cars that want to keep their A/C system in original order.
It'll take some work, and time (which, I can't seem to get enough of).