Distilled water is deionized by definition. Ions have a much lower vapor
pressure than H2O and thus aren't boiled off in the process. Distillation is a
common way of producing deionized water.
Water is not "highly corrosive". It has a pH of 7 - completely neutral. If the
water being distilled has corrosive contaminates whose vapor pressure is
greater than water, then the distillate will have them too, but since the VP of
water is already higher than the mineral salts that are the typical corrosives,
the most likely contaminates are organic.
This anecdote has some more complicated explanation than "distilled water is
highly corrosive".
Al
AB2ZY
________________________________________
From: Amps <amps-bounces@contesting.com> on behalf of Roger (K8RI)
<k8ri@rogerhalstead.com>
Sent: Monday, March 6, 2017 1:54 AM
To: amps@contesting.com
Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
Distilled water is highly corrosive. Brass hose fittings with DI flow 24
X 7 will reduce those shiny brass hose barbs to a dull redish brown
color that can be crumbles between your thumb and forefinger with very
little pressure.. Even DI water was not without some problems. We used
a thousand gallons at a time for our banks of 12 KW RF generators.used
for float zone refining of silicon. If distilled water were De ionized,
it would not be corrosive.
Time to change the fittings was usually announced when a hose barb
failed and water was sprayed all over the 6 or 7 KV circuits.
Now days the polycrystaline Silicon is more pure out of the reactors
than 1 or 2 passes in the zoners. and a whole lot less expensive. When
you see the 3 or 4 main producers output is in thousands of metric tons
at a tiny fraction of the price 50 years ago. It's no wonder SS devices
are as inexpensive as they are.
73, Roger (K8RI)
On 3/5/2017 2:41 PM, Al Kozakiewicz wrote:
> Distilled water is deionized - it is one of the ways deionized water is
> produced. All else being equal, deionized water can be cheaper to produce.
> It takes less energy to remove the ions from an aqueous solution than the
> water. Think desalination as an example.
>
> Al
> AB2ZY
>
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Jeff AC0C
> Sent: Sunday, March 05, 2017 2:29 PM
> To: amps@contesting.com
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>
> I suspect the terms are being mixed up here as well. We use DI water for
> cleaning in many of the processes in the semiconductor process specifically
> because of it's aggressive nature - it's an excellent solvent. But the
> generation of DI water is a very expensive process.
>
> For the purposes of amp cooling, distilled water would be just fine and save
> you the hassle of mineral deposit accumulation. It will have high volume
> resistivity initially but as metals leach from the cooling system the VR will
> drop slowly over time.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message-----
> From: Jim Thomson
> Sent: Sunday, March 05, 2017 1:17 PM
> To: amps@contesting.com
> Subject: [Amps] SS amps watercooling - was PowerGenius XL
>
> Date: Sun, 5 Mar 2017 01:44:43 +0000
> From: Bill Turner <dezrat@outlook.com>
> To: Amps group <amps@contesting.com>
> Subject: Re: [Amps] SS amps watercooling - was PowerGenius XL
>
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Sat, 4 Mar 2017 20:26:23 -0500, Jim wrote:
>
>>> ## de-ionized water is a chemical process, so you end up with pure
>>> water.....
> REPLY:
>
> De-ionized water is NOT pure, it is merely free of ionized atoms or
> molecules. There may still be impurities which are not ionized such as
> organic molecules.
>
> When I worked in the avionics industry, we used de-ionized water to clean
> circuit boards. Distilled water was strictly forbidden due to it's corrosive
> properties on the plumbing.
>
> 73, Bill W6WRT
>
> ### Ok, what do you call rain water, that falls from the sky ?
> It was not boiled, but was evaporated. I should collect a sample of rain
> water in a SS bowl, then pour into a plastic cap, then stuff the fluke 87
> probes into it, and see what the dc resistance is. I did this with tap
> water,
> and also distilled water. Distilled water was WAY higher, by several
> magnitudes. Interesting to note that Paul bought distilled water at
> wallgreens
> that had low resistance. Caused grief in his vapor cooled alpha. Sounds
> to me like they were selling plane tap water....labeled as distilled.
>
> ## Folks on here have mentioned the use of distilled AND de-ionized water.
> AFAIK, the 4 litre jugs of distilled water, sold at my local grocery store
> are distilled only.
> IE: Clean water that has been boiled, and the steam condensed back to water.
>
> Jim VE7RF
>
>
>
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