[Amps] SS amps watercooling - was PowerGenius XL

Roger (K8RI) 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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