Mineral oil works well - high thermal conductivity and a insulator as well
Harold Mandel wrote:
> Fletch,
>
> The subject of cooling fluids was covered in this
> reflector not too long ago under the topic of
> water-cooled RF dummy loads such as the Bird
> Econoload series.
>
> The bullet points were:
>
> 1. Ordinary tap water
> 2. Distilled water
> 3. Purified water
> 4. Ethylene Glycol/Distilled water tinctures
> 5. Antifungal treatments in solutions
>
> Different manufacturers have different recommendations.
>
> W9AC runs a Stanley Steamer and has had that in good
> condition for many years, so you might ask him what
> coolant he is happy with.
>
> I run a 50KW Econoload/Calorimeter, and use
> Zephyr Hills Reverse-Osmosis purified drinking
> water and Wal-Mart poolside antifungal treatment
> in a 0.05% tincture with no deleterious effects
> on conductivity.
>
> Since your rig will probably never be below
> freezing, forget antifreeze.
>
> Hal Mandel
> W4HBM/4
>
>
>
>
> {snip}
> I am in the process of getting a water cooled
> GS-15B cavity on line and I wonder if the
> group has any recommendations on coolants.
> {snip}
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>
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