Presureized water cooling?

Myth · 07-13-2004, 02:27 PM

Hi

Just had a thought..

Would running a type of water cooling setup under pressure be possible? If water was at eg. 2 bar would it absorb more heat at the head and release more in the rad?

Forget it! i saw the flaw.. i'm just a bit too tired to be allowed near the keyboard tonight!

jlrii · 07-13-2004, 04:21 PM

No gains for running under pressure as it does not effect the thermal properties at all..

berg · 07-13-2004, 05:46 PM

U sure about that??
- I have seen people report good results from pressurizing their system with about 2 bar. Dont know the technical reasons, but it seems to do something. Planning to try it myself at some point..

redleader · 07-13-2004, 07:39 PM

Water is basically uncompressible, so i doubt it would have any affect at all. If anything it might just force more air into solution with the water.

greenman100 · 07-13-2004, 09:14 PM

delta P(ressure) is important, will not change if sys is pressureized

bobkoure · 07-13-2004, 11:13 PM

Pressure is important if you're cooling something hot enough to flash-boil water. Even small bubbles of steam can be bad as they insulate - and increasing pressure increases the boiling point.

I don't think we're cooling anything in our PCs that's hot enough for this to be necessary. Not a bad idea for your car, though (assuming it's water-cooled).

Bob

myv65 · 07-14-2004, 10:10 PM

There is one potential benefit, but rarely would it apply. If you have a cavitation problem with your pump then raising the overall system pressure will tend to eliminate it. Since cavitation doesn't happen too often in PC systems, I wouldn't recommend it. The only harm in trying is the added potential for a leak, so if you're OK with that then by all means give it a go and report back.

greenman100 · 07-14-2004, 10:22 PM

heatercoreswill bust at anything over 20-25psi, making pressurizing a computer or car system a poor choice

jaydee · 07-14-2004, 10:27 PM

Quote:

Originally Posted by greenman100

heatercoreswill bust at anything over 20-25psi, making pressurizing a computer or car system a poor choice

Could use a oil cooler with solid copper pipe.

greenman100 · 07-14-2004, 11:37 PM

Quote:

Originally Posted by jaydee116

Could use a oil cooler with solid copper pipe.

at what benefit?

jaydee · 07-14-2004, 11:41 PM

Quote:

Originally Posted by greenman100

at what benefit?

Copper pipe will withstand 25+ psi?

bobkoure · 07-15-2004, 12:11 AM

Quote:

Originally Posted by greenman100

...pressurizing a... car system a poor choice

But they are pressurized - at least a bit.

LPorc · 07-15-2004, 12:48 AM

Quote:

Originally Posted by jaydee116

Copper pipe will withstand 25+ psi?

Heck, soft copper tubing, 1/2 ID .035" wall is rated at 618 psi @ 100F, so I think the answer is a resounding yes!

However, the JOINTS we sweat, and barbs, and tubing and stuff is much less.

Mars · 07-19-2004, 04:07 PM

You won't benefit from pressurizing the system. The only reason you need to pressurize a system is if you want to increase the boiling point.

For every 1psi you add to a sealed system you increase the boiling point 3deg.

That is why Car radiators have a pressure cap.

07-13-2004, 02:27 PM	#1
Myth Cooling Neophyte Join Date: Jan 2004 Location: Denmark Posts: 69	Presureized water cooling? Hi Just had a thought.. Would running a type of water cooling setup under pressure be possible? If water was at eg. 2 bar would it absorb more heat at the head and release more in the rad? Forget it! i saw the flaw.. i'm just a bit too tired to be allowed near the keyboard tonight! Last edited by Myth; 07-13-2004 at 03:05 PM. Reason: Stupid post ;-)

07-19-2004, 04:07 PM	#14
Mars Cooling Savant Join Date: Jul 2004 Location: Brampton, Ontario Posts: 108	You won't benefit from pressurizing the system. The only reason you need to pressurize a system is if you want to increase the boiling point. For every 1psi you add to a sealed system you increase the boiling point 3deg. That is why Car radiators have a pressure cap. __________________ The Rage is Relentless

07-13-2004, 04:21 PM	#2
jlrii Cooling Savant Join Date: Feb 2004 Location: Massachusetts, USA Posts: 158	No gains for running under pressure as it does not effect the thermal properties at all..

07-13-2004, 05:46 PM	#3
berg Cooling Neophyte Join Date: Apr 2003 Location: Denmark Posts: 2	U sure about that?? - I have seen people report good results from pressurizing their system with about 2 bar. Dont know the technical reasons, but it seems to do something. Planning to try it myself at some point..

07-13-2004, 07:39 PM	#4
redleader Thermophile Join Date: Jun 2001 Location: The deserts of Tucson, Az Posts: 1,264	Water is basically uncompressible, so i doubt it would have any affect at all. If anything it might just force more air into solution with the water.

07-13-2004, 09:14 PM	#5
greenman100 Cooling Savant Join Date: Jun 2004 Location: Florida Posts: 414	delta P(ressure) is important, will not change if sys is pressureized

07-13-2004, 11:13 PM	#6
bobkoure Cooling Savant Join Date: Feb 2003 Location: USA - Boston area Posts: 798	Pressure is important if you're cooling something hot enough to flash-boil water. Even small bubbles of steam can be bad as they insulate - and increasing pressure increases the boiling point. I don't think we're cooling anything in our PCs that's hot enough for this to be necessary. Not a bad idea for your car, though (assuming it's water-cooled). Bob

07-14-2004, 10:10 PM	#7
myv65 Cooling Savant Join Date: May 2002 Location: home Posts: 365	There is one potential benefit, but rarely would it apply. If you have a cavitation problem with your pump then raising the overall system pressure will tend to eliminate it. Since cavitation doesn't happen too often in PC systems, I wouldn't recommend it. The only harm in trying is the added potential for a leak, so if you're OK with that then by all means give it a go and report back.

07-14-2004, 10:22 PM	#8
greenman100 Cooling Savant Join Date: Jun 2004 Location: Florida Posts: 414	heatercoreswill bust at anything over 20-25psi, making pressurizing a computer or car system a poor choice

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