Reply-To: "Fred Bartoli"
From: "Fred Bartoli"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
Subject: Re: modeling a water cooling system
Date: Fri, 25 Oct 2002 23:59:30 +0200
X-Newsreader: Microsoft Outlook Express 5.00.2919.5600
Organization: Guest of ProXad - France
NNTP-Posting-Date: 25 Oct 2002 23:57:57 MEST
"John Larkin" a écrit dans
le message news: firstname.lastname@example.org...
> On Thu, 24 Oct 2002 21:42:48 +1000, "Mark Hathaway"
> >No doubt the amps are off the deep end, but they do sound good. I'm
> >on water cooling my computer rack too, and would like zero noise (studio
> >conditions) and will probably tap into the amp cooling system if all goes
> >I've built many amps, including current feedback ones with a flat
> >structure, flat out to 900khz, and single ended class A mosfet amps sound
> >really nice to my ears. Possibly a case of less is more
> >Anyway, thanks for the confirmation on the numbers achievable from such a
> >heat exchange system.
> >Mark Hathaway
> how about a cooling pond? That would be thermally efficient and
> decorative. If you ran some copper pipes along the bottom as a heat
> exchanger, you could run clean water-antifreeze through the loop and
> still raise carp in the pond.
> Here's my water-cooled pulse generator:
> The coldplate is on the bottom, a thing we bought from the McMaster
> catalog for about $28. It's a big aluminum block with pressed-in
> copper tubing. Inside the box, the serious semiconductors and
> resistors are bolted to copper heat spreader blocks. After working
> with air-cooled heat sinks, water cooling is stunning... hundreds of
> watts of dissipation barely warm things up. The problem then becomes
> the thermal resistance of insulators when a semi can't be bolted
> directly to the blocks; it's a shame that BeO is toxic and diamond is
You could use alumina, which is not too bad. There's also aluminum nitride
which has lower K, and far better heatconduction than Al2O3 (thermally &
electrically almost equivalent to BeO).
It is more expensive than alumina, but far less than diamond ;-), and also
is a much better insulator.
I believe it's available from people that sells the DYI hybrid and RF stuff.