in other words, a phase change cooler is the same thing you find in a air conditioner or refrigerator, uses a compressor and a special type of coolant. (as I understand it) you have the compressor pump coolant into a radiator or some other kind of hot side. The quick increase in pressure causes it to condense, which releases alot of heat. Then it goes through a very narrow tube (creating a pressure differential) into another radiator or 'cold side'. The sudden drop in pressure causes it to turn to vapor, and going from liquid to vapor is endothermic (absorbs/sucks up heat). So that side gets very cold. Then it goes back to the compressor and around again.
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