[Amps] SS amps watercooling - was PowerGenius XL
k8ri at rogerhalstead.com
Sat Mar 4 20:26:23 EST 2017
Good summary of the differences between DI and distilled water Jim.
As for cooling a SS amp I'd just use plain old tap water.
73, Roger (K8RI)
> ## distilled water is water that has been boiled, and the steam
> condensed back to water. Its pure water. AFAIK, distilled
> water is not ion depleted. If it is ion depleted, bad news, it will
> eat the insides out of any external rad used....esp Aluminum.
> ## de-ionized water is a chemical process, so you end up with pure
> water..... without having to go through the boiling process.
> ## You cant use 100 % distilled water in any eng or supercharger closed loop
> system, unless corrosion and rust inhibitors are used. 100% distilled water
> extracts a lot more heat vs a 50-50 mix of distilled water + glycol.
> ## so dunno if distilled water would work in a SS application. Do you really require
> the high resistivity for a 50 vdc device ? I thought there was an electrical insulating
> barrier between the LDMOS and its mating heatsink. If so, water resistivity is
> a moot point.
> ## Plane jane tap water is used for water cooled dummy loads. 20 kw into 50
> ohms = 1414 V peak. Those type of dummy loads are not an issue. Available
> up to 200 kw.
> Jim VE7RF
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