[moon161]

I've had an itch to watercool my CPU in the following fashion:

Water or alcohol phase change, with no compression-Heat boils fluid at the waterblock, and heat is rejected at a condensor at the same temp. Fluid/mist will drip down and refill the block. The whole system operates at a vacuum to depress the boiling point- no compressor is used. Nobody else seems to be doing anything like this, my guess is the unfashionably high operating temp (steady state design point of 120-130 F).

A look at the steam tables says operating pressure is .1 or .2 bar absolute pressure, so pulling the appropriate room temperature vacuum may be a trick. Denatured alcohol will mean less of a vacuum, but a potential steam explosion is bad enough, I'm not sure about adding ETOH to it =8-0X.