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Vacuum Cooling

post #1 of 6
9/24/12 at 9:53pm
Thread Starter 
when you decrease the pressure around a liquid It boils. Water boils at room temperature once the pressure is low enough. What is interesting is that this decreases the temperature of the liquid. so could you use this in a cooling loop or other situations to further reduce your temps.
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post #2 of 6
9/24/12 at 10:31pm
i mean its an interesting concept, but achieving a system with 0atm that has flowing water is just nearly impossible, almost any liquid you use would be turned to gas?
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post #3 of 6
9/25/12 at 6:35am
It's the decrease in pressure that causes the temperature drop. Hence, somewhere in your loop, there would be an increase in pressure that produces higher temperatures.

What you're suggesting is actually the reason why radiators use many small pipes in there design. The thin pipes in the radiator cause an increase in pressure due to the small volume, hence higher temperatures. The high temperature water is then cooled by the air. When water exits the radiator, there is a slight drop in pressure which causes the temperature to drop again.

There are other fluids much better suited for this type of cooling. What you're suggesting essentially phase change cooling.
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post #4 of 6
9/25/12 at 8:05am
They do it on gpus, though I don't think they do the lower pressure. But a vapor chamber is essential the same thing that you are thinking of, see http://www.legitreviews.com/article/1462/1/

The liquid is boiled off at the contact area at the chip, moves up vertically as steam, condenses on the top surface because of heat sinks on the exterior, and then collects as liquid back to the chip contact area.

If you're doing it in a chamber, why not use something with a lower boiling point, like alcohol? Would be interesting to see if a water cooled vapor chamber (using the water to condense the other liquid) improves efficiency.
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post #5 of 6
9/25/12 at 4:19pm
Thread Starter 
guess its been thought of and to a more advanced extent than I had thought.

only use I could think of is it would be with cpu pots
It would be interesting to put Liquid nitrogen or even something else (it would be cool to see some experiments) in a pot and then bring it to 0atm to further drop the temps about 10 degrees less In the case of Liquid nitrogen. at that point the nitrogen begins to solidify so idk how that would effect things.

cant think of any way this could be implemented into a loop at least in any simple way.
I thought maybe something with a bucket or reservoir but idk have not thought that all the way out.

but yeah phase change is already something so.
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post #6 of 6
9/27/12 at 10:13am
What the OP is describing is phase change. It exists already. Water wouldn't work because we have an atmosphere pressurized to 14.7 psi. Freons work because they boil far below ambient temperature at normal atmospheric pressure. It takes a lot of pressure to turn it back into a liquid.
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