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Old 26th July, 2008, 08:19 PM
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Thumbs up Dielectric fluid

i just had an interesting conversation with a gentleman [one of the rare ones that fit that description!] He came over to have an infected HDD formated. As it turned out, a few years back, he and a friend joined skills to build a liquid cooled computer. He is in refrigeration & his friend is in computers.
Apparently dielectric fluid is 100% non-conductive. They built one in which
the motherboard and HDD were completely immersed in dielectric fluid and then the liquid was cooled!
They accurately built one!
He said 3-m made it very difficult to get the fluid and it ended up costing to much to build, $4000.
I Know when I was hitting a lot of the OC'ing sites, there were all kinds of far out things being tried and I believe some thing like this has been attempted before. The concept sounds neet!
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Old 28th July, 2008, 05:21 AM
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I don't know who your friend is, but yes, there have been several attempts at super-cooling a computer using mineral oil, and the dielectric fluid from 3M. He's quite right; the cost of the 3M fluid is quite expensive. IIRC, it also starts to gel at around -100C or so. (It seems to me that I recall some guys immersing a machine in the 3M stuff and then cooling the thing with dry ice. It worked for a few minutes.)

Last edited by Gizmo; 28th July, 2008 at 05:22 AM.
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Old 28th July, 2008, 05:45 AM
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Fluorinert is the name I couldn't remember.. Expensive stuff. 250+ for 100ml of the FC40

I'm lucky enough to have equipment, so I just lathed out a D.I container. Never did manage to get to the point of using LN2 though. Probably never will as there just isn't as much play time as there used to be..
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Old 28th July, 2008, 08:28 AM
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Quote:
Originally Posted by ccperf721p View Post
I'm lucky enough to have equipment, so I just lathed out a D.I container. Never did manage to get to the point of using LN2 though. Probably never will as there just isn't as much play time as there used to be..
I hear ya there.........I've got the parts laying around here to build myself a phase-change system. Just haven't had the time.
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Old 28th July, 2008, 12:18 PM
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If I remember right, he said they ran the dielctric fluid through some sort of of refrigeration unit. That's about all I know. He definitely wasn't on the computer side of the partnership!
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Old 28th July, 2008, 03:39 PM
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One downside of doing this is that not all components on circuit boards like being cooled that much. Electrolytic capacitors contain a working fluid that's often water based. When it freezes, the capacitor stops working, and the circuit around the capacitor stops working too. This is why people tend to cool things like the CPU and chipset, rather than the whole board.

You could use FC-87, which won't start to gel until it gets down to -115C, but it does boil at 30C
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