> As I wrote before, and again, water is an excellent coolant etc, JUST
> NOT AT 1 ATM PRESSURE. If you keep a good vacuum in the vessel then
the
> water will keep much less than 100 degrees C by boiling off as low as
> 40 degrees C. And you only need a vacuum pump at the beginning because
> with a large condenser the vacuum will stay high in despite of water
> boiling off, without a pump.

Ok, so adjust the point where the closed system meets the atmosphere, so
that the water boils at the proper temperature. 

I could even see working it as part of a heating loop, just circulate
the water faster if the temp on the peltier gets too high.   

I think it's possible to use water in a closed loop design, one way or
the other, to regulate the system. Maybe even with passive circulation,
but I'm not sure of that.  Higher temperature peltiers would help a lot.



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