----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "mikea" <mikea@mikea.ath.cx>; "AMPS" <amps@contesting.com>
Sent: Monday, August 22, 2011 12:35 PM
Subject: Re: [Amps] Liquid cooling
> Thermal conductive is directly related to the electrical conductivity in
> metals.
> Silver conducts heat better than copper and so on.
> Copper is good becasuse it is easy to solder to and plate unlike
> aluminum.
> Stainless still is very bad due to the fact that it has a very low thermal
> conductivity
> and difficult to drill and solder to.
> A good and easy way to make a heat sink is to get some thinwall copper
> tubing
> and you can even flatten it slightly to improve the contact with the
> copper plate and
> solder it to the plate. As long as the path of the water flow is very very
> long compared to
> the ID of the tubing all of the water will be involved in the heat
> transfer.
Ive been running a pair each water cooled 3CX100A5/7289's on 1296 and 2304
for close to 20 years using standard copper plumbing fittings and a 4%
silver solder. High silver content will raise the melting temperatur and
possibly cause seal failure.
The HV is only 1500V and standard DI water and clear plastic hose has been
satisfactory. The water gets changed every few years and Ive made no attempt
to monitor the conductivity. With surplus SS modules now readily and cheaply
available at more power than Im generating its time for a change.
OTOH Id be a little more careful if this was a 3CW20000A7 running at 7KV (-;
Carl
KM1H
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