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Re: [Amps] SS amps watercooling - was PowerGenius XL

To: "'Amps Amps'" <amps@contesting.com>
Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
From: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 17 Feb 2017 16:58:47 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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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