For those thermodynamics people, the energy loss is as follows: E from cool water to steam -> radiator -> ambient.
By recirculating the warm water mass multiple times for each equal amount that gets returned to the vacuum evaporation chamber, the maximum amount of heat gets removed from the coolant before it returns to the cold water reservoir. While that water should be slightly above ambient, the majority of the water in that chamber will be well BELOW ambient, leaving you with a coolant mass that is well below ambient in the evap chamber. The only real heat input to that chamber will be from the heat exchanger.
Nooge. A phase change system using water as the refrigerant and no melted bones to show for it. I wouldn't be surprised to see a system like this get over 10C below ambient in straight coolant temperatures.
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