[Amps] SS amps watercooling - was PowerGenius XL

Richard Solomon dickw1ksz at gmail.com
Mon Mar 6 12:16:19 EST 2017

What is the percentage of Distilled Water
vs Water Wetter ?

73, Dick, W1KSZ

On Mon, Mar 6, 2017 at 9:32 AM, Jim Thomson <jim.thom at telus.net> wrote:

> Date: Mon, 06 Mar 2017 14:04:26 +0000
> From: Manfred Mornhinweg <manfred at ludens.cl>
> To: amps at contesting.com
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
> Okay, folks, can we then perhaps reach some consensus, or recommendation
> about what exact liquid to use in watercooled electronics?
> It has to be water-based, because there is simply no other liquid that
> matches water in terms of specific heat, availability and cost.
> We don't want buildup of anything in out heat exchangers. So we must
> make sure that the liquid is pretty much free from calcium, magnesium,
> carbonate, silicate, sulfate and other such ions that tend to
> precipitate on hot metal surfaces and form scales. This rules out tap
> water (unless it's very soft).
> We don't want algae growing either. This pretty much requires some sort
> of alguicide added to the liquid. Otherwise we WILL get them, in the
> long run. What to use? Chlorine ions? Hypochlorite? Some alcohol?
> We don't want corrosion. But a tiny amount of corrosion should be no
> problem. If we load the amplifier with distilled water, and that water
> rips some copper from our tubing and heat exchangers, until reaching a
> balance, is that so bad? I think we can live with it. If not, then we
> would need some sort of corrosion inhibitor if we start from distilled
> water.
> Conductivity may or may not be an issue. With a typical LDMOSFET amp,
> that has the source (and cooling block) at ground potential, and every
> other metal part of the cooling system at ground potential too,
> conductivity is a non-issue, as long as there are no metals with very
> different electrochemical potential there (because then one of them
> would corrode the other, by electrochemical action). It should be easy
> enough to make the whole system just from copper and plastic, so that
> there would be only one metal, and no electrolytic corrosion. Then we
> simply don't need to worry about conductivity.
> Manfred
> ##  IF conductivity is NOT an issue, then Id suggest using what is already
> being used in car eng radiator setups.  Distilled water + a corrosion
> inhibitor.
> Typ a 50-50 mix of glycol + distilled water is used.  The glycol offers the
> inhibitor properties, and also raises the boiling point by a bunch, to typ
> 265 deg F,
> IF under  typ pressure of 10-15 psi.  Less, with lower pressure, but
> still  more than
> 212 deg F.  That 50-50 mix  will also lower the freezing point to aprx
> -40 deg F.
> You can also buy the 50-50 premixed, just pour it in.
> ##  But for absolute max heat transfer,  100 % distilled water  from your
> grocery store,
> + redline water wetter is the bomb.  The water wetter has the anti
> corrosion  + anti
> electrolysis inhibitors in  the formulation..and anti everything else.
>  It also stops bubbles
> from forming, when the water does get to the boiling point.   100%
> distilled water + water
> wetter is used all the time, in spring, summer, fall  months, for the hot
> rod folks.  Its ALL that is allowed on
> most race tracks, including oval, road course and also drag strip.   On
> our local track, unless the car is
> under warranty, they  will not allow the use of glycol.
> ##  100% distilled water +  redline water wetter  will not put a dent or
> corrode or damage
> pumps, aluminum eng rads, brass fittings,  AN fittings, SS, etc and  also
> supercharger intercoolers
> and  heat exchangers.   Folks have been running the distilled water +
> water wetter for years on end,
> with  zero failures.   80 %  distilled water  +  20%  glycol will  also
> work good.   Its not like you
> have to worry about freezing temps in your home.   How often do you flush
> the rad in your car.
> Jim   VE7RF
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