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I've heard some people talk about cooling a computer by immersing the hardware in mineral oil, and seen a few videos on YouTube demonstrating it. Maybe I'm just overthinking it, but this sounds a little bit hazardous to the user's health.

ISTM that putting a strong heat source inside an open container full of a petroleum distillate product, and then staying in an enclosed room with it for a significant period of time, is a real good way to end up learning why huffing gasoline fumes is generally considered a bad thing. What am I missing? How is a cooling system like this safe?

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I don't have hard numbers, but the evaporation rate of mineral oil is, to my understanding, VERY low (as opposed to say, gasoline, which has a pretty high evaporation rate, even under normal temperatures, or even water). Heating it up by the amount put off by a PC doesn't change that very much, so the amount of evaporation stays very small, and you don't end up with a problem.

If you are really paranoid, but want to get into immersion cooling, then you should find yourself a source of de-ionized water. That's water that's filtered so heavily that there's nothing conductive in it, and thus it's safe to immerse electronics in it. (If memory serves, the original Cray computers were cooled in this way.)

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The problem with deionized water is that unless the enclosure is 100% airtight that you'll probably get impurities from air circulation over top of the water. (I have no idea what time scale it would take for this to become a problem, but it's there.) – Shinrai May 23 '11 at 18:18
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You'd also have evaporation issues, I'd think. I imagine that working with a deionized water system would sort of require easy access to de-ionized water for flushing, topping off, etc, etc. so it's probably not the best plan for a hobbyist. – Michael Kohne May 24 '11 at 10:41
Oh, yeah, duh. I didn't even think about the obvious problem >.< – Shinrai May 24 '11 at 14:07
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The same way that you can use oil to lubricate an engine without killing the driver:

  • It requires REALLY high temps to ignite
  • It's in a closed system where the fluid recirculates
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I'm not talking about igniting it, but about hydrocarbon fumes getting out into the air that the user is breathing, which is hard on your brain. – Mason Wheeler Aug 4 '10 at 17:50
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