That chiller. See the heat exchangers in the bottom left? I would love to build one of those, but if I could do that, then I would probably start getting into phase change.
I guess I should say that it is not a matter if I can build it or not, but getting into the gas part is something I haven't done. I have worked a little bit with 134a in my car, and even went so far as to replace the main gasket on my AC Compressor, vacuumed, and recharged the lines, but that is about it. I would love to build a tiny chiller like that one. I just don't know where people get those compressors, condensers, and heat exchangers etc...
And where do you get those thermal probes?!?