Correction, I should have fact-checked myself. Jim is right in that under
vapor cooling, water *does* approach 100 degs. C, then converts to steam
vapor, then cools through the condenser where it gives up energy and
converts to a liquid state. I had thought the outlet was limited to about
70-80 degs, C. as in pure liquid cooling systems.
Paul, W9AC
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Paul
Christensen
Sent: Friday, February 17, 2017 4:48 PM
To: 'Amps Amps' <amps@contesting.com>
Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>"## 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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