My XYL, a research biologist, concurs but adds that DI may be more risky
as the ION exchange process could end up leaving behind chemicals if it
is not properly balanced. Water is water. I am a physicist and have to
comment on all the anecdotal evidence that somehow adding a fluid of a
lower heat capacity (antifreeze) to one of a higher heat capacity
(water) raises the fluid's ability to absorb heat. This just is not
true. If you can use water, it is the easiest to obtain and use as well
as one of the best thermal transport fluids around.
Paul Marbourg wrote:
> This massage was bounced originally due to an outlaw email masseuse
> accountant submission.
>
> -----Original Message-----
> From: Paul Marbourg [mailto:zborg@earthlink.net]
> Sent: Saturday, March 05, 2005 10:20 AM
> To: 'amps@contesting.com'
> Subject: RE: Liquid Cooling Systems
>
> Hi group. I am sorry, but I can't stand it any longer!
>
> There is virtually NO difference between "D.I." and distilled water if the
> purification system(s) is (are) in good working order. Either process
> exposes the working fluid (water) to potential environmental contamination
> if the process stream is not properly engineered from a materials
> standpoint. Typically, an in-line conductivity meter monitors the fluid
> conductivity of the process stream. When the conductivity of a DI stream
> rises above the set point, the flow is routed through a fresh column or
> production is terminated until the column can be replaced. DI systems
> consist of passing the water through a bed of cascade-cycled ion-exchange
> resin beads, one bed for positive and one bed for negative ions. There may
> be an additional activated carbon filter for stripping non-polar trace
> organics out of the process stream as well, in high purity systems.
> Distillation stills, although very effective at removing ionic impurities,
> run the risk of still being contaminated with trace organic impurities
> (which have sufficient vapor pressure to be entrained through the still or
> transfer via azeotropic interaction with water). Thus either source of
> deionized water benefits by running it through an activated carbon filter.
> Once high purity water has been produced, it's origin does not mean a damn
> thing. Perhaps you were confusing DI water with softened water?
>
> In addition, ethylene glycol (1,2-Dihydroxyethane) and poly-ethylene glycol
> (PEG) are not the same substances! PEG is a long-chain polymer of very high
> molecular weight compared to a little ethylene glycol molecule. Their
> associated toxicities are radically different!
>
> Trust me, I am a chemist.
>
> 73, Paul WN7T
>
>
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>
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