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Minimum operating temperature of heatpipes

post #1 of 9
Thread Starter 
I just bought myself an Arctic cooling freezer 64 pro, and i was wondering if anyone knew what kind of liquid they load the heatpipes with?

I need to know because i am thinking of making myself a dry ice system for cooling the case temperature down a bit, mainly for the fun. I need to know if i can aim a duct, kicking out freezing temps directly at a freezer 64 pro, because im worried that the liquid inside might suddenly freeze, causing the heat pipes to be completely innefective. Any ideas? ill knock up a quick design sketch soon.
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post #2 of 9
well i'm not 100% sure, but i dont think that they put any gas or anything in the heatpipes. i think that they are solely meant to transfer heat to the fins.
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post #3 of 9
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The way heat pipes work is that they have a wick, and a low boiling point liquid in them. When the liquid in the wick boils, it evaporates in the tube and transfers the heat to the cooler side of the pipe, i.e. the end cooled by the cooling skives. I was just wondering if anyone knew what the liquid they use is, because the information is very thin on the ground as regards to the actual effective operating temperatures and properties of it.
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post #4 of 9
i thought it was some sort of liquid metal fillament.
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post #5 of 9
Typical 'Working Fluids' are Water, Ethanol and Mercury, and in some cases Helium, with a vapour phase of the fluid in a air tight pipe.
They rely on the Heatsink end being cooler then the Processor end. Chances are the Processor will heat it enough... But I'm no expert.
Have a look: http://en.wikipedia.org/wiki/Heatpipe
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post #6 of 9
Thread Starter 
Good find! i imagine in CPU HSFs they use ethanol, as mercury would expand too much and pop the tube. that is a good find indeed. Now i can find out if shooting dry ice vapour at my CPU HSF will case it to be more or less effective. I will post a new thread soon detailing the experement, this could be serious fun
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post #7 of 9
Good luck man =)
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post #8 of 9
well, i'm not sure that it would be very effective as everything in the pipes would freeze. dry ice is nealy -150C and the freezing point of alcohol is around -92C. still wish ya good luck though man because if you pull this off you could have one of the coolest cpus on the forum
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post #9 of 9
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Hahaha, Thas my point really, i dont want to cool it too much so that the pipes freeze, i want to angle it so that the cpu is damned cold, but still effective. The rest of the cold i want just to hang out in my case and chill the rest down a notch


Once i have some gfacts and i can prove some theory here, ill kick this up a gear and actually start the mod. Itll be fun

Also, once i have learned some more i was thinking of writing an FAQ on Heat pipes. What do you think?
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