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What lquid do most CPU heatsink heatpipse contain? - Page 3

post #21 of 67
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Quote:
Originally Posted by BonzaiTree View Post

Trust me, dry ice is not dry in the end.

It creates so much condensation it's not even funny. Trust me, I handle the stuff on a daily basis--I work at a dry ice plant. I would not want that near my computer...unless you insulated well.

I'm sure the case is even more so with LN2, but either way you need to take special care and insulate your board if you're using it.
Dry Ice and LN2 are generally just for benchmarking anyways, not daily use. Way too much of a hassle/risk of damaging your electronics.

As for acetone....just no.

I know how cold dry ice is, I have used it before. I also have my board insulated to the teeth. I almost would be willing (say for $100) to pour a glass of water on the board. I mean its balls deep in dragon skin and eraser. Too cold ain't no problem.

Acetone is used with dry ice because of its low freezing point, it can be used to transfer heat from something faster than dry ice alone because dry ice only cools the surface it is in contact with (which is not much as dry ice pellets) but inside of a liquid it touch all the liquid, which as we know touches the entire inside of the container it is in. Thus cooling with the dry ice more efficiently.


(With all these warnings it feels like everyone is my mom, jeez guise I wont spill nothing or lick the dry ice blocks. But I did install a flash light in the back of the case so you might want to tell me to not go blind from using it so much yessir.gif)
    
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post #22 of 67
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Quote:
Originally Posted by Minnetonka16 View Post

You realize that article has nothing to do with CPU coolers, right? That's for things like refrigerator heatsinks...

https://www.google.com/#hl=en&output=search&sclient=psy-ab&q=cpu+cooler+with+heat+pipe&oq=cpu+cooler+with+heat+pipe&gs_l=hp.3..0i22l2.79.4005.1.4131.27.22.1.0.0.0.491.5151.6j3j4j7j2.22.0.les%3B..0.0...1c.1.4.hp.jEuegIVQ58k&psj=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.42768644,d.aWM&fp=14e0e787545be73c&biw=1043&bih=712

Look it up, almost every cpu cooler has heat pipes in them.

EDIT: Read this page
http://en.wikipedia.org/wiki/Heat_pipe
Then if you still have questions as to what a heat pipe is and how it works let me know, I got it down.

I still cannot figure out though what most manufacturers use as their working fluid?
Edited by SkeeterSkeeter - 2/25/13 at 5:32am
    
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post #23 of 67
Heat pipe coolers usually have either pure water, light oil, really high percentage alcohol, acetone also.. due to their low boiling temps.. particularly when in a sealed tube and the only environment is the vapor from the fluid it's self. How the liquid travels in them even when on it's side, is a wick. A wick can be either grooves on the inside of the pipes, or a physical wick, typically cotton if I recall. How the wicking works is by pure pressure.. the gas/ working fluid want to even the pressure inside the pipe as it is the only atmosphere inside the pipe. As the gas is heated it will flow towards the cool end and condense to a liquid, the difference in atmospheric pressure forces the liquid along the wick back to the hot end to balance pressure (this is my take on it after all that I have watched and read about them) I've wanted to play around with making my own heatpipe cooler, see what fluids work best for PC use... hmm wonder if one could be filled with CO2, pipes would need to be good enough to withstand roughly 1100 psi though (CO2 condenses to a liquid at ~900 psi... better make that 1300 psi to be safe). Yes you can make your own heatpipes that do work.. look it up on you tube. And if I recall right.. heat-pipe technology was developed by NASA to even/regulate temps on satelites, where temps and be +1500 on one side, and -1500 on the other, this causes problems with circuit boards working right.

Hope this Helps thumb.gif

edit* B4igetflamed I know those temps may not be realistic.. it was just an example

edit2** here look at this.. there's more, but this is a start.. How to make heat pipe
Edited by Bahlzeron - 2/25/13 at 5:46am
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post #24 of 67
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Quote:
Originally Posted by Bahlzeron View Post

Heat pipe coolers usually have either pure water, light oil, really high percentage alcohol, acetone also.. due to their low boiling temps.. particularly when in a sealed tube and the only environment is the vapor from the fluid it's self. How the liquid travels in them even when on it's side, is a wick. A wick can be either grooves on the inside of the pipes, or a physical wick, typically cotton if I recall. How the wicking works is by pure pressure.. the gas/ working fluid want to even the pressure inside the pipe as it is the only atmosphere inside the pipe. As the gas is heated it will flow towards the cool end and condense to a liquid, the difference in atmospheric pressure forces the liquid along the wick back to the hot end to balance pressure (this is my take on it after all that I have watched and read about them) I've wanted to play around with making my own heatpipe cooler, see what fluids work best for PC use... hmm wonder if one could be filled with CO2, pipes would need to be good enough to withstand roughly 1100 psi though (CO2 condenses to a liquid at ~900 psi... better make that 1300 psi to be safe). Yes you can make your own heatpipes that do work.. look it up on you tube. And if I recall right.. heat-pipe technology was developed by NASA to even/regulate temps on satelites, where temps and be +1500 on one side, and -1500 on the other, this causes problems with circuit boards working right.

Hope this Helps thumb.gif

edit* B4igetflamed I know those temps may not be realistic.. it was just an example

edit2** here look at this.. there's more, but this is a start.. How to make heat pipe

Thank you, this helps. I guess Ill see if I can make one. I currently am making one of every type of cooler it seems lol.

And yes, developed by NASA.
    
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post #25 of 67
Quote:
Originally Posted by SkeeterSkeeter View Post

https://www.google.com/#hl=en&output=search&sclient=psy-ab&q=cpu+cooler+with+heat+pipe&oq=cpu+cooler+with+heat+pipe&gs_l=hp.3..0i22l2.79.4005.1.4131.27.22.1.0.0.0.491.5151.6j3j4j7j2.22.0.les%3B..0.0...1c.1.4.hp.jEuegIVQ58k&psj=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.42768644,d.aWM&fp=14e0e787545be73c&biw=1043&bih=712

Look it up, almost every cpu cooler has heat pipes in them.

EDIT: Read this page
http://en.wikipedia.org/wiki/Heat_pipe
Then if you still have questions as to what a heat pipe is and how it works let me know, I got it down.

I still cannot figure out though what most manufacturers use as their working fluid?

So your logic is if I look up "cars" on wikipedia and it mentions a W16 engine in a bugatti, that must mean your 1995 minivan must have a W16 and 1100hp as well?

FLAWLESS.
    
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post #26 of 67
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Originally Posted by Minnetonka16 View Post

So your logic is if I look up "cars" on wikipedia and it mentions a W16 engine in a bugatti, that must mean your 1995 minivan must have a W16 and 1100hp as well?

FLAWLESS.

Give me some examples of heat pipes with NO working fluid that actually work to cool a CPU. Hell even a heat pipe that works with NO working fluid. Hell prove anything you think you are saying and I might believe it.

What are you even trying to say now? That heat pipes do not exist? They are not used to cool CPU's? They do not work?


EDIT: FLAWFULL
    
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post #27 of 67
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Quote:
Originally Posted by Minnetonka16 View Post

I'll cut open my old h212+ tonight when I get home. It's air, honey.

KK honey.

Also they are under pressure. And FILLED WITH A LIQUID that has a low boiling point. So if your lucky all the liquid will turn to gas and evaporate and you will think that you a right. (A terrible condition where you believe your own lies)



Please enlighten me, how can a heat pipe work with no WORKING fluid? How can it do anything at all filled with plain air?

What you are proposing is extremely worse that using just a air heatsink directly on the CPU alone. If you speak of a system with your types of heat pipes (only air in them, So essentially a cylinder of copper closed at each end) Well if we put that on the cpu and let it get hot. It is just going to keep getting hotter until it reaches the cpu lid temp. The air inside will just get hotter and the copper tube itself will get hot. And seeing as the heat sink for heat pipe cpu coolers is held above the cpu a few inches it will actually cool worse than usuall if filled with air.


Have fun destroying a heat pipe tonight.
    
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post #28 of 67
Quote:
Originally Posted by SkeeterSkeeter View Post

KK honey.

Also they are under pressure. And FILLED WITH A LIQUID that has a low boiling point. So if your lucky all the liquid will turn to gas and evaporate and you will think that you a right. (A terrible condition where you believe your own lies)
Heatpipes have some liquid in them, but not much.
Heatpipes are vacuum not pressure.

Minnetonka16
Cut the heatpipe and it will not work again. End of.
post #29 of 67
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Quote:
Originally Posted by doyll View Post

Heatpipes have some liquid in them, but not much.
Heatpipes are vacuum not pressure.

Minnetonka16
Cut the heat pipe and it will not work again. End of.

I know they have liquid. To correct myself. They have an amount of liquid determined by the desired application.

A vacuum means empty of mass. The pipe is not empty of mass, it has the working fluid. The fluid is under pressure determined by the desired application. Because Pressure*Volume = number of moles * R (constant) * Temperature, we change the pressure inside the tube to change the temperature at which the working liquid will boil.

Ex. at sea level water boils at 100C, far below sea level water boils at merely 72C.

** Not sure if R in PV=nRT is a constant or a value based upon the gas in question. If I remember correctly it is just a constant of value .021?



Minnetonka16: Hows your experiment coming along over there? (hopefully your heat pipe is filled with an inert gas, don't want you breathing in something bad when you open it...)
    
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post #30 of 67
Quote:
the boiling point of water raises and lowers in accordance with pressure. at atmospheric pressure water boils at 212f/100c, raise that 18psi and it will boil at closer to 260f. however if you lower it to 28-29inHG it will boil at room temperature. thus if the heat pipes contained distilled water under vacuum, they can be engineered to be at the point of phase change around standard cpu operating temperatures. furthermore distilled water is cheap, easy to handle and no toxic, all beneficial from a manufacturing point of view
.

Found this quote on another forum and it makes sense, to me at least. Lower atmospheric pressure would make the distilled water boil at a much lower point. Years ago I read about the challenges mountain climbers faced. For instance, water will boil at such a low temperature at high altitudes that an egg placed in the boiling water will never cook.
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