I think that in order to make this idea work, the necessary temperatures are too high. i.e. it would need to be boiling to transfer the amount of heat needed and at atmospheric pressure 100C is a bit too high for a CPU.
If you evacuated the WB chamber it might work, feed a small supply of water and draw off the vapour to somewhere it can be condensed and reused. Oh, a heatpipe!
If you took the vapour away via a tube to be dumped or reused then you have part of a very conventional phase change system with a very inefficient (at these temperatures) refrigerant.
It'd be very interesting getting it to work, there are very critical balances of pressure, temperature and water volume which have to be maintained in order for it to work at all, let alone be efficient. I'd be concerned that the band of efficiency would be too narrow for the load fluctuations of a CPU.
It'd be pretty neat though.
Cheers
Incoherent
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