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post #1 of 12 (permalink) Old 12-27-2018, 05:53 PM - Thread Starter
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Need help on Chiller Fluid

Hello,
this probably should've gone in the regular water cooling section but oh well. Anyway, I need advice on the fluid for my chilled loop. I need one that wont kill my acrylic blocks but will help me go as low as possible. Thank you!
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post #2 of 12 (permalink) Old 12-29-2018, 02:19 AM
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Most people use automotive antifreeze/engine coolant as far as I know.


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post #3 of 12 (permalink) Old 01-02-2019, 07:08 PM
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The best option that is cost effective is pure or nearly pure ethanol. You can find it in the form of indoor fireplace fuel. I’ve had trouble sourcing legitimate pure ethanol but have taken the fireplace fuel down to -40 with no freeze up. You can also use methanol in the form of windshield wiper fluid but methanol can be dangerous.
Glycol based coolant will start to gel at lower temps and put major strain on your pump.
If you can’t source ethanol at all you can use Everclear drinking spirits but that is pricey.
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post #4 of 12 (permalink) Old 10-01-2019, 03:49 AM
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Quote: Originally Posted by Veltri View Post
The best option that is cost effective is pure or nearly pure ethanol. You can find it in the form of indoor fireplace fuel. I’ve had trouble sourcing legitimate pure ethanol but have taken the fireplace fuel down to -40 with no freeze up. You can also use methanol in the form of windshield wiper fluid but methanol can be dangerous.
Glycol based coolant will start to gel at lower temps and put major strain on your pump.
If you can’t source ethanol at all you can use Everclear drinking spirits but that is pricey.

What are you using chill the ETOH to -40c?
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post #5 of 12 (permalink) Old 10-01-2019, 05:08 AM
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Quote: Originally Posted by Veltri View Post
The best option that is cost effective is pure or nearly pure ethanol. You can find it in the form of indoor fireplace fuel. I’ve had trouble sourcing legitimate pure ethanol but have taken the fireplace fuel down to -40 with no freeze up. You can also use methanol in the form of windshield wiper fluid but methanol can be dangerous.
Glycol based coolant will start to gel at lower temps and put major strain on your pump.
If you can’t source ethanol at all you can use Everclear drinking spirits but that is pricey.
Unfortunately, ethanol will damage acrylic, as do most solvents.

I believe there are some engine coolants that will still stay fairly fluid at very low temperatures. Another user on the forum just bought a bunch of antifreeze brands and just put samples in the freezer at different ratios to see which gels up the least with the highest water content.(water still hast the highest thermal capacity)
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post #6 of 12 (permalink) Old 10-01-2019, 07:39 AM
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Hi,
Which chiller ?
Home made/ retail ?

CPU
i9-9940x With Heatkiller IV Pro and VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
AOC G2460PG 24"G-Sync 144Hz
Mouse
Red Dragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Hard Drive
eLeaf MELO-3 4ml
Power Supply
SE US18650VTC6 3120mAh 30A 3.6V 18650 Li-ion Battery - GREENx4
Case
ANGIS Legion MOD 200w Geek Vape
Operating System
VapeWild RazzleBerry 50-50-0mg nic
▲ hide details ▲
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post #7 of 12 (permalink) Old 10-02-2019, 01:32 AM
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Quote: Originally Posted by Gilles3000 View Post
Unfortunately, ethanol will damage acrylic, as do most solvents.
Yes it will...but there are also plenty of non acrylic blocks...if you go this way just swap out the blocks.

Acetal is ethanol and methanol safe, as are EPDM and Nitrile...plenty of blocks and o-rings not made from acrylic. Acetal is even ok with Acetone. for that matter there are plenty of full copper/nickle blocks.. also safe with ethanol.

even plenty of reservoirs made from glass which again is safe with ethanol.

your biggest issue is could be your pump choice...which again...even EK lists the materials... Stainless steel, PPS-GF40, EPDM O-rings, Aluminium oxide... all ok with Ethanol.

PPS-GF40 - (Xytron) - which is the impeller mould...again excellent resistance to acetone at and ethanol.

Last edited by Thermal_Preist; 10-02-2019 at 01:36 AM.
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post #8 of 12 (permalink) Old 10-02-2019, 01:37 AM
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Quote: Originally Posted by Thermal_Preist View Post
Yes it will...but also plenty of non acrylic blocks...if you go this way just swap out the blocks.
Spoiler!
I know, but OP specifically asked for a coolant that won't damage his acrylic blocks, so I'm pretty sure he wants to keep them.
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post #9 of 12 (permalink) Old 12-01-2019, 08:50 PM
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Quote: Originally Posted by Thermal_Preist View Post
What are you using chill the ETOH to -40c?
Home built chiller.
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post #10 of 12 (permalink) Old 12-01-2019, 08:59 PM
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Quote: Originally Posted by Gilles3000 View Post

Unfortunately, ethanol will damage acrylic, as do most solvents.

I believe there are some engine coolants that will still stay fairly fluid at very low temperatures. Another user on the forum just bought a bunch of antifreeze brands and just put samples in the freezer at different ratios to see which gels up the least with the highest water content.(water still hast the highest thermal capacity)
True. But acrylics really aren’t suitable for chillers anyway. If OP wants to play around near dew point, sure, they will work. But the real low temperatures will destroy off-the-shelf water cooling components regardless of the coolant. The waterblock on my chiller is fully brazed shut and all copper. It looks a lot like an evap from a phase unit. No O rings or gaskets or plastic parts anywhere. They just don’t hold up to low temps.
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