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Sub zero liquids

post #1 of 45
Thread Starter 
So, in the pursuit of performance I have come up with a plan to get some nice cold water in my loop. Having a window box (I have started using google sketch to make a quick mock up, I'll post pictures tonight). Though I have a couple question/reservations.

1.) Ethynol and Propylene Glycol's freezing point is pretty low (70-30 water mixture is around -50C), but it seems to get a little thicker around the -30 to -40 C. Can the D5 handle that without breaking or wearing down?

2.) 90% Isopropyl alchy seems to have a lower freezing point (-89), but I don't really know how to use it inside a loop. Do you make a 50-50 mixture or use it pure in the loop? Does it pose a danger to the components (ie: combustion, corrosion). Can I get away with a 30-70 mix (30% iso 70% water) and still be freeze proof. Will the Iso degrade upon contact with water and require more to be effective.

3.) I'm planning on two seperate loops with 2 Koolance heat exchangers. One loop will be under Car Prestone (ie:Ethynol Glycol) and the other preferably under distilled with some Isopropyl alchy. Being that the loop in the computer will not be sub zero, I just want to make it freeze proof when it enters the heat exchangers so as to not cause a clog up. The second loop will be anywhere from -10 to -40 during winter.


The reason why I want two seperate loops is one; ease of maintanence and two; best thermal liquid inside the computer.

Don't worry about condensation, I have that coverd. I get 15 to 18% humidity during winter here, which means at 20C ambients my due point is -5 C before dew occurs. I'll be using my rads in a pull config inside the case and will have the cold water and fans heating up the water just a little and cooling the inside of the case to sub ambients also. I have bought neopryne to give me a back up incase of dew however.

Thanks!
Edited by Rognin - 8/12/11 at 9:19am
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post #2 of 45
alcohol or acetone will give the best temps by far... they will not freeze.. they WILL eat your pump impeller and crack your pump housing..along with dissolving the inside or your tubing. *I have pics if you need proof I reached -70c without any issues using my chiller.

For 2x loops, I would recommend you use option #1 for your exterior loop.. and straight distilled for the interior loop.
post #3 of 45
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post
alcohol or acetone will give the best temps by far... they will not freeze.. they WILL eat your pump impeller and crack your pump housing..along with dissolving the inside or your tubing. *I have pics if you need proof I reached -70c without any issues using my chiller.

For 2x loops, I would recommend you use option #1 for your exterior loop.. and straight distilled for the interior loop.
The thing I'm scared of is ice build up within the heat exhangers on the distilled loop side of things. If one side is reall cold the distilled could freez in the pipes and clog up. It would also give me no performance if there's and ice build up in the heat exchangers. Or so I would think.
Edited by Rognin - 8/12/11 at 9:27am
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post #4 of 45
If your getting temps down that low.. then you will need anti-freeze on both sides/loops. You can run your internal loop about 80/20 [water/ethyl] for less viscosity and strain on the pump.. and keep the outside loop 60/40 for better protection against icing.
post #5 of 45
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post
If your getting temps down that low.. then you will need anti-freeze on both sides/loops. You can run your internal loop about 80/20 [water/ethyl] for less viscosity and strain on the pump.. and keep the outside loop 60/40 for better protection against icing.
Yeah that's what I was thinking. I just don't like having that stuff inside the computer loop. But I guess if I go down this road I won't have much of a choice in the matter.

Use regular car prestone and mix myself or is there some special stuff sold to computer ehtusiasts?
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post #6 of 45
bloody hell mistah how did you get -70c out of a chiller?
For what it's worth i use 60% M.E.G. and 40% distilled water but even then i only get a max of -32c
Maybe its the 3 metre run from the res to the first block,i dunno
I R Jelly!!
Edited by MightyMission - 8/12/11 at 9:35am
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post #7 of 45
Thread Starter 
Quote:
Originally Posted by MightyMission View Post
bloody hell mistah how did you get -70c out of a chiller?
For what it's worth i use 60% M.E.G. and 40% distilled water but even then i only get a max of -32c
Maybe its the 3 metre run from the res to the first block,i dunno
I R Jelly!!
Sorry, I'm not a chemist... =P

What's M.E.G.?
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post #8 of 45
What about condensation? Assuming you're not sitting outside with your rig gaming in full ski gear
    
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post #9 of 45
haha i only know what it is cost it cost me both arms to buy it,typing with my nose...
MEG is Monoethylene Glycol i'm not sure of your location but in the UK it's a little difficult to get and costs £30/gallon,i use 3 gallons
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post #10 of 45
Thread Starter 
Quote:
Originally Posted by CarlosSpiceyWeiner View Post
What about condensation? Assuming you're not sitting outside with your rig gaming in full ski gear
I covered that point in the OP.

20C Ambients
18% Humidity
-5C Dew point
Neopryne.
Rads taking cold water and heating it up to cool inside of the case bringing dew point even lower.
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