From: John Larkin
Subject: Re: modeling a water cooling system
Date: Wed, 23 Oct 2002 11:47:46 -0700
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On Wed, 23 Oct 2002 01:10:56 GMT, Satan's Little Sister
>On Tue, 22 Oct 2002 20:22:04 +1000, Mark Hathaway babbled:
>My personal experience with water cooling puts the typical heater core
>at about 30W/K, 1 gal/min water, 60 cfm air. There's only minimal gain
>with more water/air. Typical arrangement is four parallel cores around
>the perimeter of a plastic milk crate with a single central fan above
>(ugly, but effective). A transmission oil cooler would work even
>better for you.
>If you are willing to do some digging (or have a well), ground sink
>cooling would be ideal.
Ideal air cooling (perfect coupling between the heat source and the
exit air) gives about 1.75 K/W per CFM, or about 0.03 K/w for 60 CFM
available air flow. And that's almost exactly what you're seeing. That
implies that your situation is dominated by available air flow, and
not by any other thermal resistances. So in your example, more air
would substantially reduce the effective thermal resistance, but
better cooler geometry couldn't help much.
1 GPM of water flow has an intrinsic thermal resistance of about
0.0037 K/W, so there's plenty of water flow in this example.
(but, as someone pointed out, the amplifier in question is insane)