First of all, Munchies, Airsoft guns use CO2 and refrigerants aren't always liquids, they are also gasses and the changing from one state to another is what allows heat to be pumped from one location to another. R-404A is all well and good (with a boiling temp of -51.0F) but it is also more expensive (compressor, gas, etc.) than R-134A (with a boiliing temp of only -15.1F) and you can get a pretty cheap R-22 system (yeah it depleates the ozone a little, but with the size of the system Munchies would be using it's just as bad as someone driving an old beat up car to work every day and anyways, if R-22 is that harmful to the ozone, you had better watch the news because i leaked 15lbs of the stuff into the atmosphere over the past three days because of a leaky solder joint in my A/C) and it will have a nice boiliing temp of -41.5F which will be nice. Oh, and Yucky, HFC means Hydrofluorocarbon, R-22 has a 10F lower boiling point than R-22 and liquid isn't compressed, it's called a condensor which cools the compressed gas into a liquid which is then sent to the evaporative coil to evaporate and draw heat out of the surroundings. You can't thermal epoxy the pipes together, they would not be tight enough of a seal at 200+psi. You need to braze the copper tubing together with 10% silver solder. And obviously you have to find a compressor specifically designed for the coolant you chose. You had better be really comfortable with working with plumbing and you should become friends with a refrigeration shop so that they can evacuate (draw a vacuum) your system, leak check it and then fill it for you, since most compressors won't tolerate moisture at all. If you have any other questions about phase change cooling please feel free to direct them to <ace41984@yahoo.com>.
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