Go Back   Pro/Forums > ProCooling Technical Discussions > General Liquid/Water Cooling Discussion
Password
Register FAQ Members List Calendar JavaChat Mark Forums Read

General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

Reply
Thread Tools
Unread 05-27-2008, 09:09 AM   #1
bbaall
Cooling Neophyte
 
Join Date: Jan 2008
Location: uk
Posts: 8
water cooling help

hey,
i am designing a water cooling system and was wondering how does the flowrate and pressure drop effect the heat carrying capacity of water, is it a way to find out the required flowrate and pressure drop or is there any formulas? another thing i was wondering is how to calculate the pressure drops in water blocks and ideally what should be the normal inlet and outlet water temperature diffrence.
bbaall is offline   Reply With Quote
Unread 05-28-2008, 05:30 AM   #2
billbartuska
Cooling Savant
 
Join Date: Jun 2005
Location: Skokie, Illinois
Posts: 322
Default Re: water cooling help

Quote:
Originally Posted by bbaall
hey,
i am designing a water cooling system and was wondering how does the flowrate and pressure drop effect the heat carrying capacity of water, is it a way to find out the required flowrate and pressure drop or is there any formulas? another thing i was wondering is how to calculate the pressure drops in water blocks and ideally what should be the normal inlet and outlet water temperature diffrence.
Well, the restriction a pump has to work against will effect it's output, both pressure and flowrate. Martin's Flow Rate Spreadsheet is an excellent tool for determining these effects.

You'll also need some information on how the block(s) and rad you plan on using perform at various flow rates. Here's a good guide on how to determine what you need to know.

And, of course, searching these forums will answer pretty much any other questions you may have concerning watercooling.
__________________
My new rig....
Intel SE440BX-3, PIII 550 (@ 680)
MX440 275/332 (@ 350/400) and 3DFX Voodo 5 5500 160/160 (@180/180)
Two Opticals and 120 gigs (w/28gigs in RAID0) on 4 Maxstors
billbartuska is offline   Reply With Quote
Unread 05-28-2008, 07:17 AM   #3
bbaall
Cooling Neophyte
 
Join Date: Jan 2008
Location: uk
Posts: 8
Default Re: water cooling help

thanks billbartuska, the spreadsheet is quite good and i will have a look at the forums as well.
thanks for ur help
bbaall is offline   Reply With Quote
Unread 06-09-2008, 07:15 AM   #4
#Rotor
Cooling Savant
 
#Rotor's Avatar
 
Join Date: Feb 2002
Location: Dione, sector 4s1256
Posts: 852
Default Re: water cooling help

Damn haven't had my hand at this for a while, but they say it's like a bicycle, so here goes....

rule of thumb: The bigger the Delta in Temp between your transducers and your carrier, the more heat energy will be transferred.

what does this mean???.... simple really, flow-rate is everything. well almost.

but you will do good by making it your nr1 goal, to have as high a flowrate as is possible with what you have to work with...

__________________
There is no Spoon....
#Rotor is offline   Reply With Quote
Unread 06-10-2008, 01:46 PM   #5
Brians256
Pro/Staff
 
Brians256's Avatar
 
Join Date: Oct 2001
Location: Klamath Falls, OR
Posts: 1,439
Default Re: water cooling help

Flowrate is good for a REALLY good reason: barrier region.

High velocities make the region of slow moving coolant next to heat exchanging region (waterblock or radiator) thinner. So, the dT is moving heat over a thinner volume of stagnant water.

#Rotor, I'm not sure what you are talking about, since the velocity doesn't affect the water temp in between heat exchange elements. Well, actually a higher-power pump can add another parasitic element to the system by heating up the water, but that's another matter.

As for the bicycle metaphor, I'm not sure that the person who came up with it ever *had* sex. If he/she did... then that must have been a REALLY good bicycle ride to even think about comparing it to a real relationship. Who ever heard of make-up bicycle rides?
Brians256 is offline   Reply With Quote
Unread 06-11-2008, 07:32 AM   #6
#Rotor
Cooling Savant
 
#Rotor's Avatar
 
Join Date: Feb 2002
Location: Dione, sector 4s1256
Posts: 852
Default Re: water cooling help




well the way I see it.... the longer the carrier ( water) resides in an exchanger, the more heat is absorbed or expeled... this is usually the thing most people think of as a good reason why the water should flow slowly.... but not, since the longer it stays, the smaller the difference in temp between the water and the exchanger becomes. And it's the Delta-T that is the primary key to good effective cooling. Without Delta-T nothing will happen, no matter what you do.

So to actually put it more correctly, do whatever it takes to have your Delta-t's, be it between the water and block, or between the water and the radiator, as large as you possibly can....
__________________
There is no Spoon....
#Rotor is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 12:52 AM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
(C) 2005 ProCooling.com
If we in some way offend you, insult you or your people, screw your mom, beat up your dad, or poop on your porch... we're sorry... we were probably really drunk...
Oh and dont steal our content bitches! Don't give us a reason to pee in your open car window this summer...