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Originally Posted by AngryAlpaca
I think the problem with water may be that it has an insanely high boiling point! I'm pretty sure that the boiling point is the lowest temperature your system can be after stabilizing. Yeah yeah, the vacuum thing, but do you really want to deal with that much vacuum? Why bother with actively doing it? That will be a bit of a hassle, to say the least, and I doubt it would turn up much. The highest I've seen a manufacturer reporting is 200,000W/m^2k, but that was for a flat plate. I think that a well done (heat pipes are in their relative infancy, in my opinion) heat pipe will offer all the performance we'll ever need.
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Yes maintaining a vacuum deep enough is the main issue. For water to evaporate @ 10c (50f) it must be maintained at about .18 psia or about 29.56" of vacuum. That is why I am intrested in other fluids, R11 has a boiling point of about 23.8c (74.9f) at 0 psig... in other words in a 72f room it would remain a liquid in an open canister but would immediatly boil if placed in your palm. Unfortunatly it does not have the incredible latent heat of vaporization that water sports.