Actually, a phase exchanger cools itself...
The freon (or whatever other more environmentally friendly refrigerant) actually cools the pump.
The only fan used in a refrigerator is the one that recirculates the inside air through the cold loop. Some models however, do have a fan for the pump.
A phase change cooler can achieve a lower temp, usually somewhere about -25 to -15F, but that depends on the pump.
The problem is that they are more complicated, because it involves compressing a gas to pressures in excess of 200psi. They are a closed loop, and you can't manipulate them very much because that loop must remain closed, otherwise you have to refill the system, which involves a lot of guesswork if you don't know anything about it.
I'm looking into all this phase change stuff right now. I'm trying to find a way to measure the resulting cooling, and to put together a how-to DIY guide. The theory is simple, but the application is nebulous at best.
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