Lowest Safe loop temp?

[FallOutBoyTonto]

With the colder temperatures arriving, and my location way up north I have access to some very cold dry air that I could put in front of my 360 rad (with push/pull fans).  I also have a temperature sensor on one of the plugs on the loop to measure water temperature.  While testing to see how cold I could get the loop it got all the way down to -2°C!  I got a little concerned of the coolant getting thicker and losing flow so I stopped the cold air intake.  What is the coldest safe temperature of a water loop?

[Guest]

8 minutes ago, FallOutBoyTonto said:

With the colder temperatures arriving, and my location way up north I have access to some very cold dry air that I could put in front of my 360 rad (with push/pull fans).  I also have a temperature sensor on one of the plugs on the loop to measure water temperature.  While testing to see how cold I could get the loop it got all the way down to -2°C!  I got a little concerned of the coolant getting thicker and losing flow so I stopped the cold air intake.  What is the coldest safe temperature of a water loop?

 

Maybe I would gather around -10c to -20c if they used Propylene Glycol in the AIO loop would be ok. 

(Assuming you have an AIO....)

 

 

[The_russian]

6 minutes ago, ShrimpBrime said:

 

Maybe I would gather around -10c to -20c if they used Propylene Glycol in the AIO loop would be ok. 

(Assuming you have an AIO....)

Wouldn't going below ambient temps cause condensation to form on the pump/block and motherboard area?

[Guest]

1 minute ago, The_russian said:

Wouldn't going below ambient temps cause condensation to form on the pump/block and motherboard area?

depends on the dew point. But yes possible.

[FallOutBoyTonto]

I've got an expanded AIO using EK Cryofuel and the cold air intake is going through the case as well as the rad so condensation shouldn't be an issue.  

[FallOutBoyTonto]

D'oh!  I could have just checked the bottle.  I'm an idiot, I got very close to the listed freezing point of -3°C...   phew

 

What kind of pre-mix can I purchase that can get lower?

[Guest]

1 hour ago, FallOutBoyTonto said:

D'oh!  I could have just checked the bottle.  I'm an idiot, I got very close to the listed freezing point of -3°C...   phew

 

What kind of pre-mix can I purchase that can get lower?

Long life engine coolant. Usually good for -40c on a 50/50 distilled water mix.

[LogicalDrm]

-> Moved to Custom Loop and Exotic Cooling

(Because of coolant discussion)

[For Science!]

7 hours ago, FallOutBoyTonto said:

D'oh!  I could have just checked the bottle.  I'm an idiot, I got very close to the listed freezing point of -3°C...   phew

 

What kind of pre-mix can I purchase that can get lower?

Anything rich in ethylene/propylene glycol: https://www.mayhems.net/products/mayhems-xt-1-nuke-v2-clear-concentrate-250ml

 

I personally wouldn't recommend engine coolant because it is more toxic and poses health/environmental risks if not handled correctly compared to PC coolants designed to be used on the desk.

[FallOutBoyTonto]

Ordered myself some Koolance 705 coolant: https://koolance.com/liq-705-liquid-coolant-bottle-low-conductivity-700ml-clear

 

Has a freezing point of -35 and is pre-mixed to prevent corrosion.  Now I'm anxious to put it in

[FallOutBoyTonto]

Now I'm wondering is it safe to add some dye to this specific coolant without raising the freezing point too much?  No biggie if not, just curious