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Originally Posted by Chris Hibner
Heat removal is done by expanding a gas. This is how refrigerators and air conditioners work. You put gas into a cylinder and then pull back on a piston (like the opposite of what a compressor does). The expansion of the gas causes the temperature of the gas to drop. If you remember the ideal gas law from chemistry class, you can see the relationship.
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I'll dabble some research into the ideal gas law tonight. The article didn't say, I guess I assumed it was "wire-cooled". If I'm reading that right, it would basically have something like a fridge cooling system, just toned down for a keg?
Would this be silent (or relatively quiet)? I just can't picture how one would repetitivly expand a gas without releasing, unless the gas is standard air and is released back into the general air supply after each stroke.