-50 or lower mixtures.....

[chew*]

Liquid frostbyte came home from the HVAC shop last night.......Froze Windshield washer fluid in 1/2 hour..........added some denatured still froze but temp pulldown was alot longer......Tried some straight propylene glycol later today and started gelling at -40F. Anyone got a tried trued and tested mix that = has quick pulldown guranteed to -75F and is very thin as in to aid pump flow output? I'm tired of wasting money on mixes i pour down the drain.
I know denatured alcohol works but temp pulldown takes forever.

[RussC]

Wow,
I can't think of anything besides a the antifreeze/alchol mix. But that won't go as low as you want it to.

Im stuck, this will take some research.

RussC

[chew*]

Wow,
I can't think of anything besides a the antifreeze/alchol mix. But that won't go as low as you want it to.

Im stuck, this will take some research.

RussC

Thx russc, appreciated. Heh never had to complain about something getting to cold before.....Just think after this I get to search for a submersible pump that won't fail at those temps either.......luckily I think i found it

This just ran across my mind russc, kerosene with antigel additive.......maybe mixed with propylene glycol what are your thoughts? Of course taking into consideration how the hoses will react to it.

[RussC]

Umm, with kerosene, I guess fuel hose for automotive stuff? I don't know the antigel does, or how it works.

RussC

[chew*]

Umm, with kerosene, I guess fuel hose for automotive stuff? I don't know the antigel does, or how it works.

RussC

keeps diesel/kerosene from gelling up at really low temps....

[Kunaak]

http://automotive.gillroys.com/Fluid...t-s573906.html

-67F there.

I am trying to remember this stuff we use on boats here in alaska.
winters here in some places can get well below -50F outside on a clear night, and theres almost nothing ever keeping a boat in a harbor warm.
I use to see this stuff around all the time... but its been ages since I been anywhere near a marine store.

anyways, thats what I would suggest.
look for marine grade antifreeze.
not just automotive.

however, the above stuff might be worth a shot, at -67 F as it's freeze point.

[Gautam]

I don't understand why you aren't using pure denatured alcohol? Obviously the best choice for this application. Best viscosity and the cheapest out of anything that can hold temps that low.

[chew*]

I don't understand why you aren't using pure denatured alcohol? Obviously the best choice for this application. Best viscosity and the cheapest out of anything that can hold temps that low.

i already stated it has a very long pulldown time......pulldown of 4 hours + versus propylene glycol at 1 hour or less.........

[fatty]

Try some 3M Fluorinert http://products3.3m.com/catalog/us/e...er/output_html

[ixtapalapaquetl]

Try some 3M Fluorinert http://products3.3m.com/catalog/us/e...er/output_html

At $260 a liter, that definitely qualifies as extreme cooling!

http://www.parallax-tech.com/fluorine.htm#price

[chew*]

WOW thats exactly what i need..........expensive but meets my requirements to the T. I wonder how easily attainable it is......

[fatty]

I don't know but I may know some one who is getting some to play with over the next month or so ......

[chew*]

LMK when he gets it..I may need some as nothing else seems to work the way i want it to as it kills pump flow harshly.

[Kunaak]

flourinert is basically a thick goo if I recall...

your gonna need alot more then a pump to move that through a watercooling system.

[alexio]

http://www.icecoldcomputing.com/

Seems ethanol and methanol are your best bet. Methanol is a bit toxic though. Spiritus would be good te use as it consist of about 85% alcohol and 15% methanol. You should add demi water until it starts to freeze up because water is always better than any other coolant in therms of viscosity and thermal conductivity. It's also easy to discolour the spiritus using filtrating paper.

Spiritus may be a Dutch word but I don't know how to translate it.

[Byron]

interesting thread about which fluid does this job best at these temps

Just think after this I get to search for a submersible pump that won't fail at those temps either.......luckily I think i found it

could you send a link of that pump m8? i'm interested to know

Cheers

also, did you test any of the combos/mix's yet?

[Jonathan_S]

I would be interested in the link to the pump also! I am working on my chiller right now, my computer is water cooled but I don't think my pump is going to like -20 - temps. Please post a link for us.

[wdrzal]

regular anti freeze should get you there, something like prestone, you can use a mixture between 50% and 70% with water. water has great capacity.

Be sure to get the pure form and not the pre-mix which most places are selling now. Also look at the freezing point of different brands, some are lower than the others.

[{.bLanK} GoD]

Yeah i just got my hands on some prestone too.

That flourinert Has a viscosity of <50@-75c which isnt too bad. bout the same as motor oil. water pump wont cut the mustard but its not totally outta the question.

[{.bLanK} GoD]

No sorry i was looking at the wrong item.
flourinert fc-84 has a viscosity of 4.0 @ -57c which is really thin. water pump will be sweet as
http://multimedia.mmm.com/mws/mediaw...999c&bLX____Z-

[[486]]

use 190 proof vodka

[Byron]

use 190 proof vodka

[epion2985]

so what did you end up using?

[Jonathan_S]

My chiller has not reached -50c and doubt it will. I have got it down to -32c and the pull down time is pretty fast less than 2 hours. My holding tank capacity is 3 gallons but I am filled only to 2 1/2 gallons. I used 1 gallon of strait antifreeze (prestone) it states that at a 70% antifreeze 30% water it is good to -84f or 64.5c. I diluted it with one gallon of pure denatured alcohol (ace hardware brand =, Methanol, Ketones, and Ethanol. SMELLY STUFF). I then added 1/2 gallon of distilled water, this really cut the smell of the denatured alcohol.

I believe that this mixture will do very well at -50c, Ethanol freezes at -114c and a 70-30 % mixture of the antifreeze and water freezes at -84f or -64.5c. Even if I did not even bring the alcohol into the equation, the antifreeze water mixture is 75-25% so it would freeze at a even lower temp (not much granted maybe -65.5c) . Then adding the gallon of denatured alcohol will bring that temp lower and thin the solution considerably at that temp, IMO. I haven’t studied much thermo dynamics but do understand the mixture solution equation is not linear, but it only has a minor curve and approximations will suffice. This solution will probably freeze around -70c or so.

6quarts + 4 quarts = 10 quarts so I have 6 tenths that freezes at -65c and 4 tenths that freeze at -114c . I believe that I can safely say that -70c is a safe freezing temp to assume the mixture will freeze at ( it could be lower but -70c is 20 degrees lower than -50c)