Date: Thu, 16 Feb 2017 00:15:55 -0500
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
To: Big Don <bigdon39@gmail.com>
Cc: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
Wouldn't Amps, or Ham Amps be a better reflector for this thread?
Were talking distilled water here. If it's conductive enough to present
a danger, it's long past time for a replacement.
When I was a Tech (before going back to college) it was rare to have
water spraying around inside those 100, 200, and even 250 KW generators
and the load coils were exposed.
Water cooling is a simple, mature technology. Water cooling is rather
simple. It's the monitoring that can get complicated. In high voltage
areas, we used linear (solenoid) coils of clear Tygon tubing to get the
necessary high resistance.
The simplest was a clear plastic block, drilled and tapped for all the
water exhausts. You could see at a glance how well any water circuit
was doing. Simple, cheap, and foolproof "IF THE OPERATOR PAID ATTENTION".
73, Roger (K8RI)
On 2/15/2017 5:24 AM, Big Don wrote:
> Water-cooled amps HEALTH TIP --
> There are enough ways to *electrocute* yourself playing with amps
> without having leaked water spraying everywhere....
> Don N7EF
#### Wife uses distilled water for her breathing machine at night. I just
checked the
resistance of distilled water... vs tap water. Distilled water resistance is
sky high, I mean
really high. Distilled water comes in 4 litre jugs, dirt cheap at any of the
local grocery stores.
## I use it myself for the mustang engine and supercharger. Ditto with the
ford fusion.
At the telco I worked at, we used nothing but distilled water for the huge 2
v dc cells, typ
24 in a series string. We brought in pallets loads of 5 gal distilled water
containers. We also
used distilled water for the big start batteries for the emergency generators.
These days,
start batteries are all sealed.
## distilled water is so dirt cheap, and resistance is so high, and LDMOS
only uses 50 vdc,
whats the issue ? You could toss a bucket of distilled water into a 7 kv dc
B+ supply..and
nothing will happen.
## BTW, per einacs care and feeding, it sez air cooling will remove 50 watts
per square CM
of internal anode area. Vapor phase cooling will remove 135 watts per
square CM of
surface area. Water cooling will remove 1000 watts per square CM. Vapor
phase cooling is
only more eff, in that it does not require a pump, and uses a lot less water.
Depending on the size
of the rad, and if its mounted vert or horz, u may not even require a fan for
the rad.
## water cooling requires more water circulation, and a big rad, and forced
air through the rad,
but it will remove heatr faster than any other method... except maybe freon.
## If u look at modern HVAC cooling sytens on commercial buildings these
days, they now mount the
huge rads parallel to the roof, instead of vertical. Heat rises, and the
rads work more eff if mounted
horz vs vertical. They still use a fan below the rad though. telcos use
lotsa AC during winter, due to the
heat of the equipment, so in winter, night time, cool wx, the fan for the rad
is not always required.
## In a lot of cases, they will shoot water through the vert mounted rads,
to cool em. They use
freon to do the actual cooling, and water to cool the freon, then more water to
cool the rads,so 3 loops
in total.
## For LDMOS, the pair of water lines could easily be routed to else where,
then a speed
controlled fan on a small rad, and ditto with a variable flow rate pump. A
12,000 BTU small rad
from jegs, or any of the other speed shops cost < $50.00 And thats for a
.75 inch thick core.
The higher capacity rads are just thicker, like 1.5 inches thick. I use one
for my auto tranny.
oem cooler is marginal when a supercharger is used, so added a high eff bar +
plate type rad, in
series with oem rad, problem solved. Old style tube and fin type rads are
going out of vogue these days.
Small oil coolers and auto tranny rad coolers would work just fine with
distilled water.
## U would end up with a dead quiet LMOS setup. Use enough combiners, and
you could get..on paper,
5 or 10 kw pep out if required. Combining 2 or even 4 ... of those 2.4 kw
pep output LDMOS amps
has already been done. So you could use them as building blocks. This is
all into a dummy load
of course, for pure scientific analysis.
Jim VE7RF
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