Eclipse-1313

ok, well iwas wondering if it were possiable to make efficent heat pipes for a relitivly lowcost to impliment in a heatsink i was designing. I was thinking i could:

# get copperpipe
#crimp and solder both ends
#drill a hole in the top
#inject a liquid {Am reserching what to use}
#Heat the bottom of the pipe to a higher then operating tempreture
#seal off the top {Allowing the liquid to contract creating a vaccuum hopfully lowering the boiling tempreture of the liquid inside}

Ok so what i was opeing to find out:

1:What Liquid should i use for best proformance?

2:Should the inside of the pipe be polished before crimping and soldering the ends?

3:What percentage of the pipe should contain liquid? {Or how full should it be?}

and another relevent information would be greatly appreicated!

i was hoping to make a thread on how to make a low cost generic heatsink suitiable for a silent Cpu cooler {Probably only suitiable for the lowerend 45nm cpu's running at stock} or GFX cards.


Thank you all in advance .

Marshmellow17

"2:Should the inside of the pipe be polished"

From what I remember, I saw a picture of a cut of a heat pipe and it almost looked as though the inside has steel wool on the walls of the pipe...

Eclipse-1313

Are you refering to a wick? Because the heat pipe was going to be used on a vertical orientation, and i think it is beyond me so i was not even going to attempt it. I have rethought my earlier plan. Now i am, as before going to crimp and silver solder one end of the copper pipe. Fill it probably with acetone or maybe propane?, put a one way valve on the top. Heat the entire thing to like 150c with a oxy torch and hope that creates a good low pressure area when it cools, so the evaperation will take place at a lower temp . I was thinking i would post a working drawing of what i mean if that will help? Has anyone out there seriously tried to make there own heatpipe before?

DuckieHo

1) http://www.cheresources.com/htpipes.shtml Distilled water's working range is 30-200C.

2) No. You want to decide on a wicking technique for non-vertical heat-pipes. The most common method for smaller pipes is sintered metal. For larger pipes, you can use mesh or groves.

3) You have to do calculations for that....

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Eclipse-1313

Hmm ok i am not going to try to make a heatpipe with a wick at this stage, atm i am only going to use it vertically. I did see that but acetone has a lower boiling temp so wouldnt it give better cooling from a lower temp. As in lets say distiled water in a heat pipe starts cooling at like 30c, wouldnt i be able to get acetone to start cooling from like 25? I mean even if it doesnt have as large of a range i am hoping what ever i put it on never goes over lets say 80c so wouldnt i be better sacrificing the x amount on the higher range for the 5c on the lower? Also i quickly read over that link you gave me, i am going to go over it properly tomorrow (atm i am replying on my phone so it is a bit hard to view properly). Thanks for the help .

DuckieHo

There's a list of working ranges in there. Don't forget that you need to consider temperature and pressure. Water is just MUCH easier and safer to work with. Boiling acetone can be dangerous.

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

Eclipse-1313

Ok thanks mate, i will go over the site tomorrow and give it some in depth thought. But for now, goodnight lol.

SLeeZeY

I wanted to have a go at this with a standard gauge water pipe

The only thing I found similar was a guy that used copper wire as a wick (he stripped a load of electrical cable and just put the snipped lengths or raw wire into the pipe. Then put 5ml of cheap vodka (water/ethanol) inside before he sealed it (with the bottom end in water and the top end heated (obviously) as he soldered it.

(I believe ethanol's boiling point is 75*C-ish... its been a while since I was at school lol)

Personally, acetone would be better like you said, I used to use that stuff to clean styrene off tools, it evaporates so fast on your hands they feel like ice.

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Eclipse-1313

Did you hear if that guy had any luck? Tomorrow i was planning on looking into weather you can get one way valves with a pressure release no them, my hope was to do as i mentioned above and then adjust the initial heating temp and in turn the inside pressure to work out what pressure would be the best. Once i was able to make a working heat pipe i was planning on making a cpu heatpink initialy as mentione above, it was going to be a aluminum block mounted to the cpu with the 4 heat pipes running through it and up, slightly bending out with fins attached to give air better flow through the sink. Rough sketches will be posted soon. Any suggestions no that design?

SLeeZeY

I'm guessing his idea was the same-ish to mine, I was just gonna make a standard looking design before trying anything 'odd'.

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