This may be somewhat basic, but salt in itself is corrosive. When I was deep
into building (and rebuilding) water cooled engines, those that had either a
glycol based additive or some other form of rust inhibitor the cooling passage
ways showed little or no signs of corrosion. Those that had been operated with
water only, the passageways were often thick with rust, corrosion and scale.
When no need for an anti-freeze was indicated, a slight amount of soluble oil
was added to the coolant. The soluble oil was easy to find, all that had to
been done was go to the auto parts store and ask for "water pump lubricant."
If I were to operate a water cooled tube, I wouldn't mind at all answering the
question as to "what is that white stuff in the water?" (the soluble oil)
rather than explain why there was one double HH of an explosion when the
cooling water hit the white hot elements inside of the very expensive and now
destroyed transmitting tube.
Pardon the long explanation, (that is my personal downfall,) some of it not
directly aimed and amps and such, but a better understanding of why, Imo,
beats the dickens out of I wish someone had given me more info.
73,
Gary... wa6fgi
----- Original Message -----
From: David Smith
To: amps@contesting.com
Sent: Thursday, March 10, 2005 9:44 PM
Subject: Re: [Amps] Liquid Cooling Systems
I'm certainly very interested in this discussion as I'm contemplating a
water-cooled 23cm amp project shortly.
> ... In both applications you are trying to increase the heat transfer
> into and out of a liquid. You don't really need a
> USE-IN-TRANSMITTING-TUBES-ONLY label on a product to use it in a liquid
> cooled tube..
One thing that you do need to consider in cooling a tube amp is the
conductivity of the coolant. It's not a concern in a race car, but when
there's 4kV+ at the cooler, it certainly IS a concern in an amp. This
rules
out any use of salt. Does anyone know if Glycol or "Water Wetter" makes
the
solution conductive at all?
There's also corrosion problems to consider. As I understand, Glycol-based
coolants also contain corrosion inhibitors. Would corrosion be an issue in
an amp using just distilled water?
Regards,
Dave
VK3HZ
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