See on below,
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On 3/5/05 at 12:22 PM David Kirkby wrote:
>Japerlick@aol.com wrote:
>
>>Sure, you could use Glycol, but why would you want to?
>>
>>Glycol has very high "Enthalpy" which means it can hold a lot of heat per
>>unit volume.
>>
>Which is what you want for a good coolant!! You want a small amount of
>the liquid to be able to absorb a lot of heat, with the minimum change
>in temperature.
>
>However, I think water has one of the highest specific heat capacities,
>which is why it is a good coolant.
>
>>It is also really poinsonious.
>>
>I don't think there is such a chemical as 'glycol', but there are many
>'glycols'.
>
>http://www.thermalfluidsinc.biz/generic2.html
>
>has a coolant based on ethylene glycol (I can't be bothered to look at
>their data, as it is in Microsoft Word format). but ethylene glycol is
>dangerous as you say
Etheylene Glycol was the first "anti-freeze" that was developed by my
undersatnding and happened years ago, about 60 miles from here, as an accident
actually. It was developed in Dupont, West Virginia by the Dupont Chem. Co.. It
used to just be a by-product and was pumped into the Kanawaha river as a waste
(Bet the fish enjoyed that). During the winter months, the engineers there at
the Dupont works noticed that in the winter, the river would never freeze over
from there and some piece below the plant. A bright chem. engineer got some,
mixed it with the water in his radiator, and whala, anti-freeze was born. Of
course he had to let Dupont get by with the patent and licensing because he
worked there. Isn't it lucky that the EPA finally seen it shouldn't be pumped
into rivers as a waste too? I think the time line on this was around 1942-1943
or so as the "chemical valley" here was formed about that time when WWII broke
out.
The dangerous part is that only a small amount can do permenant damage to the
kidneys. Enough of a dose, kidney failure happens and you die. This very
chemical still kills plenty of pets and some humans if they're dumb enough, or
not old enough to know any better, to drink it.
>
>But 'Thermasafe'
>
>http://www.thermalfluidsinc.biz/generic3.html
>
>is based on propylene glycol, and is said to be okay if there is
>accidental contact with food.
>
>But I doubt any have the specific heat capacity of water, which why it
>is one of the best liquids for removing heat,
>
>> There are LOTS of other good fluids
>>one could use, but why? Water is great!
>>
>It has its downsides, as have been referred too.
>
>>Cray Research used Flourinert, made by 3M, in their computers. The
>entire
>>computer, circuit boards and all, were inside a flourinert solution which
>was
>>continously circulated to draw heat out of the ECL logic.
>>
>
>Just thought I'd mention that if anyone wants to use a Cray
>supercomputer for free, you can get an account here
>
>http://www.cray-cyber.org/general/start.php
>
>Just don't expect much performance, as the machines are very old.
>
>It sure checks the portability of your code, as sizeof(short)=8 !!!
>
>A paper describing the original Cray and its cooling can be found there
>too.
>
>--
>Dr. David Kirkby,
>G8WRB
>
>Please check out http://www.g8wrb.org/
>of if you live in Essex http://www.southminster-branch-line.org.uk/
>
>
>
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