hi , for pc cooling system , what are some inert liquids with high boiling point ? where i find ? other info tooSkyjumper - 6-5-2010 at 11:55
How about the liquid you buy for pc cooling? You dont need a high boiling point.
UTFSE!
Anti-freeze for a pump system. The whole system could be submerged into mineral oil. But thats stupid pointless.
Once again UTFSESedit - 6-5-2010 at 15:19
I have seen a clear computer that was completely sealed and they filled it with glycerine to aid cooling and hinted at the idea that this is how all
the computers in the future will be cooled since its far superior then air cooling.JohnWW - 7-5-2010 at 01:25
Inert liquids with high boiling points? If you want some that are only difficultly flammable, are not electrically conducting, and only poor
conductors of heat, try liquid fluorocarbons and silicones of appropriate molecular weights. Paraffin hydrocarbons could also do, but are inflammable.
But if you want a liquid with a really high boiling point, and a long liquid range above 30ºC, but which is electrically and thermally conducting,
you should look at gallium. Mercury could be used in the latter case, but is toxic, and probably more expen$ive.
For a PC cooling system, a thermally conducting liquid would be MUCH more efficient, but use of gallium would be possible only with all parts of the
cooling system above its melting-point of about 30ºC, not easily possible except in the hottest climates. Other than that, Hg would have to be used
instead. The eutectics of Ga with Al or Zn or Sn have melting-points only very slightly less than this. The eutectic of Na with K is out, because of
the extreme reactivity and fire hazard of this alloy if it were ever exposed to air or water (or to any common gas other than argon).
While water has a high specific heat capacity (although only a low thermal conductivity), it is liable to be corrosive to many ferrous or aluminium
alloys, and its electrical conductivity would short out circuits if it were to leak. Its short liquid range at normal pressure, only to 100ºC, is
also a disadvantage; although this can be extended by use of pressure, but again this would require a cooling system also designed as a pressure
vessel, and the consequences of a rupture of such a cooling system - superheated steam - would be serious.
[Edited on 8-5-10 by JohnWW]DJF90 - 7-5-2010 at 02:21
I'm fairly certain there's a hardcore computer cooling company that uses NaK as the heat exchange fluid! Its supposedly designed so that its "safe",
and so that theres close to 0% chance that the NaK can be exposed to air.
Of common fluids, water is pretty good, as it has a high specific heat capacity, and if you're able to, you could rig up an evaporative cooling
system, as someone here tried for condenser cooling. Typically high end fluids for "watercooling" of PC's consist of water, ethylene/propylene glycol
and corrosion inhibitors as far as I remember, plus UV active/fluorescent pigments for "wow factor"franklyn - 7-5-2010 at 05:09
High boiling point ?
What are you talking about ?
The peak operating temperature of a CPU is not over 90 ºC
realistically this should be down around 55 ºC or less if you
expect it to behave reliably with some lifespan.
Commercial liquid cooling is far more expensive than a good
fan and offers practically no advantage in terms of heat
removal. It offers a theoretical advantage only with high
overclocking , what it is intended for.
To give you some idea , you can buy a 5000 BTU room window
air conditioner on sale for as low as $80. A computer liquid
cooling system which can handle perhaps a fifth of that is
$ 300 or more. You would do better to remove the door to
your computer case and attach the room air conditioner with
a cardboard shroud and duct tape.
Idealy vapor heat transfer is the most effective means of
sinking heat. A heat pipe as the ones used in Laptops with
the radiator immersed in a container filled with a volatile fluid
will maintain the operating temperature at the boiling point
of the fluid.
Drop in some dry ice and for as long as it takes to boil
away you will maintain the teperature low enough to
overclock to at least 3 times the rated clock speed.
Using the cooling coil , pump and radiator from a small
refrigerator will serve almost as well as the dry ice.
.psychokinetic - 7-5-2010 at 23:56
Water?
If your pc is going over 100C, I think you have bigger problems.Sedit - 8-5-2010 at 00:10
Title suggest high temp fluid but you want one with a high heat transfer rate not a high boiling point as much.
[Edited on 8-5-2010 by Sedit]fludyoptasyphos - 9-5-2010 at 10:07
thks!!Skyjumper - 10-5-2010 at 08:45
NOT GLYCEROL. You need a NON CONDUCTIVE substance. Mineral oil was used in a demo I saw (a PC was submerged into a fishtank filled with oil.)ndriley97 - 23-3-2011 at 16:06
For reals? NaK is pretty nasty stuff. Explodes on contact with air/water. Plus its thermal coefficient is lower than water. Looks cool and sounds
cool though to have a liquid metal as a coolant. How about mercury?bahamuth - 23-3-2011 at 17:26
For reals? NaK is pretty nasty stuff. Explodes on contact with air/water. Plus its thermal coefficient is lower than water. Looks cool and sounds
cool though to have a liquid metal as a coolant. How about mercury?
Thermal coefficient?
Thermal conductivity of NaK alloys is very high, probably the highest of any cheap, liquid at low temp substance there is with a thermal conductivity
almost 40 times higher than water both in liq. state. Specific heat capacity is another matter, while still high it is roughly one quarter that of
water
Mercury amalgamates with copper and a number of other commonly used heat sink materials as aluminium, so it is unsuitable. Another option would
perhaps be a gallium alloy as Galinstan with a thermal conductivity reaching about 70% that of a eutectic NaK alloy.
And believe me, to those who discussed submerging your PC components in almost any oil or solvent for cooling purposes will certainly dissolve or ruin
the rubber/plastic parts of e.g. capacitors in a very short while.
My bad - I meant capacity, not conductivity. The mention of mercury was facetious - I was just pointing to another dangerous compound that has no
place in a household appliance.peach - 26-3-2011 at 06:47
It's used in supercomputers and to cool equipment in the semiconductor industry.
Being fluoro saturated, the oils tend to display exceptional properties (similar to PTFE); e.g. high breakdowns, essentially 100% unreactive,
vanishingly low dielectric constants.
These fluoro oils are also not as 100% safe and easy as they at first seem. I have heard from people who work with them that they tend to make your
skin dry and flaky if you get it on you, and that they can get around certain elastomer seals; so they disappear over time for no apparent reason.
I think I have seen people mentioning mineral and silicone oil.
Because the clocks run at such high frequencies, it's not just the resistance of the fluid that need to be thought about. The high frequency signal
will couple between points or go missing (dissipate) if the fluid has a high dielectric constant; as you've built a capacitor around every exposed pin
on the board with the fluid.
Here are some examples of permeability;
Vacuum, 1
Air, essentially 1
Sulphur Hexafluoride, 1-2 <---- this is that gas that's 5x denser than air. It's used by the national grids because it's an excellent electrical
insulator and can actually extinguish arc faults on the transmission line switches, fuses and breakers. In fact, they're one of the primary users. It
has other odd properties, like being a good thermal insulator, so it's used in super double / triple glazing and for soundproof glazing due to it's
density.
Fluorinert FC-77, 1.9
Silicone oil, 2.5
Glycerol, 42
Water, 80
Submersed cooling is a lot of effort given the results. If you miss something out (e.g. the coolant gets contaminated), it'll do more harm than good.
There are certainly far more realistic and fun games you can play with girls for $600.
[Edited on 26-3-2011 by peach]White Yeti - 4-8-2011 at 07:10
Does ethylene glycol cooling fluid have a high enough boiling point? It's cheap, readily available, and reasonably inert. Surely, your computer
doesn't bet much hotter than 200C, unless your pump stops working.fludyoptasyphos - 4-8-2011 at 21:01
Freon NH3 N2 ? It's betterfludyoptasyphos - 4-8-2011 at 21:27
doh ! but the disvantage the boiling point is too low
needed another refrigerant (thermal exchanger) system, extern of PC / supercomputer
mainfream huge-supercomp. and one is like-mainstream (I can't remeber the name, use also to drive money)
need a high refrigeration, the systems for they ?fludyoptasyphos - 6-8-2011 at 17:56
The options are not complicated for a computer at home.
Heat sink with fan
Massive heat sink on it's own
Water in a loop
Mineral oil submersion
Phase change cooler (by far the most common for those after high performance)
Liquid nitrogen / dry ice cup on the CPU
Are you trying to overclock your PC? Because if that is the case, I suggest you use a fluid with a very low freezing point, and a low boiling point.
Ethylene glycol should do the trick if you are trying to run your PC at normal temperatures. Mineral oil is so inert that you can run it right through
the CPU without damaging it.
Another, (more dangerous) option is to use a molten metal of some kind. NaK or mercury would work amazingly well as heat transfer fluids because of
their very high thermal conductivities. Mercury would work really well, but be sure not to use any aluminium parts because the fluid will react with
them, forming an amalgam and eating through the parts in question. Copper parts should do the trick. NaK would also work extremely well, but as we all
know, it reacts vigorously with water. Cs wouldn't work very well because it freezes at too high a temperature for use in a high performance computer
cooling system. Just be sure to electrically insulate the CPU from the cooling fluid, or else you're in for a big surprise
