dielectric liquids at -50-c?

[pwnt by pat]

i was just wondering if anyone knows of a dielectric liquid that can reach -50c or below while keeping a viscosity about that of water? plain and simple.

thanks
pat

[Surreal]

florienert

the spelling is off maybee...

check out 3m.com they make it. VERY EXPENSIVE $500 per gallon and thats not even the best they have.

but not like water. thicker. movable by a good pump. maybee eheim 1262



http://products3.3m.com/catalog/us/en001/electronics_mfg/electronic_materials/node_BTX63C85CFge/root_GST1T4S9TCgv/vroot_2FCSL3BCQXge/theme_us_electricalmaterials_3_0/command_AbcPageHandler/output_html

[pwnt by pat]

florinet rocks (or so says octools.com) but yea, thats waaaay too expensive. i would need about 4-5 gallons of some liquid and $2500 is too much.

[L337 M33P]

You could try something like petrol (gasoline) or some other light hydrocarbon. Trouble is that you would need a closed system to reduce the risk of explosion/poisoning/death :-/

Antifreeze is out as that is only good for -10 or so, Methanol is toxic, I think Ethanol would be a good choice as it freezes at -114C. I think it remains fluid and doesn't become viscous as it's a hydrogen-bonded small molecule. Also it has a decent specific thermal capacity :)

[pwnt by pat]

Ethanol hmm... well i guess i should explain what im doing. origionally i planned on submersing my mobo with the freezing element of a dehumidifer. however, now im thinking that i might just make my own rad out of some 1/2" copper tubing, and submersing that with the freezer of the dehumidifier and maybe antifreeze. then running the, say Ethanol, in its own submersion loop. i figured that way, i could use less of the Ethanol to get about the same cooling. sealing the loops is no problem. i already have a full wc setup so either theoretically could work. ideas?

edit: found 50:50 water:ethanol for 20 bucks a gallon... not too bad. i dont know if ill have enough for a full submersion like i was hoping but 2-3 gallons will suffice for the second plan.

[pwnt by pat]

found some motor oil thats good to -45c, which is good but its about 23 bucks a gallon which is bad (i need about 4 ouch)

[walkerIV]

Consider windshield fluid. It's a methanol/water mix, not sure how low the temps range goes, but should be well in the sub-zero area. Motor oil is not exactly ideal for the system, since it's designed to be run in a warm engine and not at constant -50.
My favorite mineral oil link:
http://www.geocities.com/thetropics/lagoon/3373/

[pwnt by pat]

so he did use mineral oil for that? i got that link in teh plain watercooling forum no more than an hour ago. what can i get mineral oil in? on line ive only been able to find it as horse laxatives.

also, wouldnt the water in a methanol/water mix allow some electricty to flow?

oh and im sure it wouldnt be a constant -50. thats just a 'safety' range. what is going to be cooling this liquid is the freezing part of a dehumidifer submersed with the mobo.

[pwnt by pat]

okay, so i noticed some windshield washer fluids pour temp are -45f which should work provided they are dielectric. mineral oil works but i am looking up its pour temperature. ive decided motor oil is out of the question because of its cost (look at my vid card).

edit: does mineral oil gel or does it just freeze and at what temps? after a bit of googleing i couldnt find either.

[walkerIV]

Scrap the washer fluid. It will most likely conduct, although the best way to check would be with a simple tester.

Take a look over here:
http://forums.2cpu.com/showthread.php?threadid=40039&highlight=mineral+oil

and in general search those forums for beppi and mineral oil projects.

[lclark2074]

Originally posted by pwnt by pat
Ethanol hmm... well i guess i should explain what im doing. origionally i planned on submersing my mobo with the freezing element of a dehumidifer. however, now im thinking that i might just make my own rad out of some 1/2" copper tubing, and submersing that with the freezer of the dehumidifier and maybe antifreeze. then running the, say Ethanol, in its own submersion loop. i figured that way, i could use less of the Ethanol to get about the same cooling. sealing the loops is no problem. i already have a full wc setup so either theoretically could work. ideas?

edit: found 50:50 water:ethanol for 20 bucks a gallon... not too bad. i dont know if ill have enough for a full submersion like i was hoping but 2-3 gallons will suffice for the second plan.

may i make a sugestion if you use this put CO2 or argon on top of it so it cant go kaboom

[pwnt by pat]

i think what im just going to do is get food grade mineral oil since its about 4-10 bucks a gallon. then once everything is set up, wait for the oil to gel or freeze or sludge, whichever comes first. then ill just run the board frozen in a block of mineral oil. (it will be safer to take to lans in a solid form anyway - i have to show this thing off when its completed.

[soccrstar]

Originally posted by pwnt by pat
i think what im just going to do is get food grade mineral oil since its about 4-10 bucks a gallon. then once everything is set up, wait for the oil to gel or freeze or sludge, whichever comes first. then ill just run the board frozen in a block of mineral oil. (it will be safer to take to lans in a solid form anyway - i have to show this thing off when its completed.

um....

did i hear that correctly...
u submergin' ur mobo in liquid? while turnin it on?
freezin it?

might i ask wats dat gon accomplish?

explain? linky?

[lclark2074]

he is trying to refrigerate the mother board for hi overclock but condsation is problem so the oil will stop it. but i havent heard of it done this way before.

[-=Mr_B=-]

i do remeber a sience project where they simply used those waterproofing spreys on a mobo, with everything connected, and tossed it in a aguarium... they dident go in to overclocking tho. If i remeber right eventualy it fryed, was the memory socket somehow getting shorted and everything went dead. never got it sorted if it was over exposiure to water, or fysical movements that broke the water proofing....

B!