>"## How the heck do they do vapor phase cooling with a cpu ? Vapor phase
cooling works on the premise that the water is brought up to a boil. And
thats
with normal sea level pressure."
Vapor phase cooling doesn't require a completely closed system under
pressure. In the case of the Alpha 70V, outlet temperature is held to about
70 degs. C with standard atmospheric pressure. Under demand, a thermostat
closes, boosting boxer fan speed, increasing air flow past the condenser
fins.
Bringing the water to a boil isn't necessary, nor is it wanted. As water
temperature approaches 100 degs. C under standard atmosphere, bubbles build
and form an insulator against the tube's boiler. Left out of control, the
boiler surface will exceed 100 degs C if too much of the surface is within
air bubbles. For the same reason, I doubt any well-designed vapor-cooled PC
or SS amplifier uses a water outlet temperature above 70-80 degs. C.
Paul, W9AC
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