Overclock.net › Forums › Cooling › Water Cooling › 2 pumps, 2 radiators, 1 cpu block
New Posts  All Forums:Forum Nav:

2 pumps, 2 radiators, 1 cpu block - Page 2

post #11 of 15
As mentioned before, parallel pumps are a bad idea. Not only do you not get much performance boost, if one pump fails the water more or less just recirculates through the failed pump, meaning that your loop gets almost no flow.

As for the rads, the problem with slowing the water down is that the heat transfer rate suffers.

When the water is moving fast it goes into turbulent flow - this means that the water mixes very well through the tube. When the water slows down it goes into lamina flow - all the water goes in a straight line down the pipe:

laminar_turbulent_flow.gif

The problem with lamina flow is twofold - one is that a static boundary layer forms on the surface which provides an insulating effect, the other is that the flow doesn't mix. This means that the "hot" water in the centre of the flow can't easily transfer its heat to the wall and out of the tube.

Whether a flow is lamina or not depends on its Reynolds number which in turn is based on fluid properties and flow channel dimensions, which we can't change, and flow rate, which we can.

Ideally you want to keep the rate of flow nice and high so as to ensure you stay in the turbulent region. This helps heat transfer rates stay high. Don't worry about the water not having time to cool down much in the radiators, it also doesn't have time to heat up much in the block so the effect is negated (a lot more too it but that is close enough).

TL:DR - Series, not parallel, for pumps. You want to keep your flow rate high through heating and cooling components, for this serial is better than parallel.
Main
(21 items)
 
HTPC
(10 items)
 
 
CPUMotherboardGraphicsRAM
i5 2550k P8P67 Pro Sapphire HD 7950 G.Skill RipJaws X 1600 Cas 9 
Hard DriveHard DriveHard DriveCooling
Corsair Force 120 WD Blue 500GB WD Caviar Green 1TB XSPC RayStorm 
CoolingCoolingCoolingCooling
RX240 MCR 220 EK 7950 Copper Acetal  DDC-1T 
OSMonitorMonitorKeyboard
Windows 7 64-bit Dell U2311H Oculus Rift DK2 Ducky Shine 3 MX Brown 
PowerCaseMouseAudio
Corsair TX 750W CoolerMaster CM690 II G500 Klipsch ProMedia 2.1 
Audio
Asus Xonar DX 
CPUMotherboardRAMHard Drive
A10-6800K Gigabyte GA-F2A85XN-WIFI G Skill 1600 CAS9 Kingston SSD Now 60GB 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 1TB LG Slim Blu-Ray player Silverstone NT06-PRO  Widows 7 Home Premium 
PowerCase
Silverstone Sfx Series ST45SF 450W Silverstone SG05 
  hide details  
Reply
Main
(21 items)
 
HTPC
(10 items)
 
 
CPUMotherboardGraphicsRAM
i5 2550k P8P67 Pro Sapphire HD 7950 G.Skill RipJaws X 1600 Cas 9 
Hard DriveHard DriveHard DriveCooling
Corsair Force 120 WD Blue 500GB WD Caviar Green 1TB XSPC RayStorm 
CoolingCoolingCoolingCooling
RX240 MCR 220 EK 7950 Copper Acetal  DDC-1T 
OSMonitorMonitorKeyboard
Windows 7 64-bit Dell U2311H Oculus Rift DK2 Ducky Shine 3 MX Brown 
PowerCaseMouseAudio
Corsair TX 750W CoolerMaster CM690 II G500 Klipsch ProMedia 2.1 
Audio
Asus Xonar DX 
CPUMotherboardRAMHard Drive
A10-6800K Gigabyte GA-F2A85XN-WIFI G Skill 1600 CAS9 Kingston SSD Now 60GB 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 1TB LG Slim Blu-Ray player Silverstone NT06-PRO  Widows 7 Home Premium 
PowerCase
Silverstone Sfx Series ST45SF 450W Silverstone SG05 
  hide details  
Reply
post #12 of 15
Quote:
Originally Posted by Giantmuffin View Post

Hmm I see.

What if I create 2 complete loops, but they join and split right before and after the cpu block? That would make both loops work with consistent flow, wouldn't it? Since the pumps pull and push... 2 pumps, 2 reservoirs and 2 radiators.

If one pump fails you still won't have any redundancy with that kind of setup.
Shinobi XL
(11 items)
 
Cosmos 2
(9 items)
 
Raven RV03
(8 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Asrock Z77 OC Formula XFX Radeon HD 7870 XT Kingston HyperX Predator 2400 MHz 2*4 GB 
CoolingCoolingOSPower
EK Supreme HF EK-VGA Supreme HF Windows 7 Ultimate  Silverstone 1200W Strider Gold Evolution v2.0 
Case
Cooler Master Cosmos II 
  hide details  
Reply
Shinobi XL
(11 items)
 
Cosmos 2
(9 items)
 
Raven RV03
(8 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Asrock Z77 OC Formula XFX Radeon HD 7870 XT Kingston HyperX Predator 2400 MHz 2*4 GB 
CoolingCoolingOSPower
EK Supreme HF EK-VGA Supreme HF Windows 7 Ultimate  Silverstone 1200W Strider Gold Evolution v2.0 
Case
Cooler Master Cosmos II 
  hide details  
Reply
post #13 of 15
Thread Starter 
Ok that makes good sense. I understand and know more now. Serial it is hehe.

If I want to cool a gfx card in that same loop, where does it go? Would this be the best setup?

Res - Pump - CPU - Rad 1 - GPU - Rad 2 - Res
post #14 of 15
Quote:
Originally Posted by Giantmuffin View Post

Ok that makes good sense. I understand and know more now. Serial it is hehe.
If I want to cool a gfx card in that same loop, where does it go? Would this be the best setup?
Res - Pump - CPU - Rad 1 - GPU - Rad 2 - Res

Time for more science! (I love science)

It takes a surprising amount of energy to heat water up, roughly 260W to heat water moving at 1GPM (US gallon per minute) by 1°C. I can provide the maths if you wish.

This means that even after going through your CPU block the water is only going to be ~1°C warmer at most. Given that it really doesn't matter too much if you put your CPU right before your GPU or even the other way round, as the change in temperature is minimal.

The best thing to do is to lay out your loop in the order which gives the least amount of tubing.
Main
(21 items)
 
HTPC
(10 items)
 
 
CPUMotherboardGraphicsRAM
i5 2550k P8P67 Pro Sapphire HD 7950 G.Skill RipJaws X 1600 Cas 9 
Hard DriveHard DriveHard DriveCooling
Corsair Force 120 WD Blue 500GB WD Caviar Green 1TB XSPC RayStorm 
CoolingCoolingCoolingCooling
RX240 MCR 220 EK 7950 Copper Acetal  DDC-1T 
OSMonitorMonitorKeyboard
Windows 7 64-bit Dell U2311H Oculus Rift DK2 Ducky Shine 3 MX Brown 
PowerCaseMouseAudio
Corsair TX 750W CoolerMaster CM690 II G500 Klipsch ProMedia 2.1 
Audio
Asus Xonar DX 
CPUMotherboardRAMHard Drive
A10-6800K Gigabyte GA-F2A85XN-WIFI G Skill 1600 CAS9 Kingston SSD Now 60GB 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 1TB LG Slim Blu-Ray player Silverstone NT06-PRO  Widows 7 Home Premium 
PowerCase
Silverstone Sfx Series ST45SF 450W Silverstone SG05 
  hide details  
Reply
Main
(21 items)
 
HTPC
(10 items)
 
 
CPUMotherboardGraphicsRAM
i5 2550k P8P67 Pro Sapphire HD 7950 G.Skill RipJaws X 1600 Cas 9 
Hard DriveHard DriveHard DriveCooling
Corsair Force 120 WD Blue 500GB WD Caviar Green 1TB XSPC RayStorm 
CoolingCoolingCoolingCooling
RX240 MCR 220 EK 7950 Copper Acetal  DDC-1T 
OSMonitorMonitorKeyboard
Windows 7 64-bit Dell U2311H Oculus Rift DK2 Ducky Shine 3 MX Brown 
PowerCaseMouseAudio
Corsair TX 750W CoolerMaster CM690 II G500 Klipsch ProMedia 2.1 
Audio
Asus Xonar DX 
CPUMotherboardRAMHard Drive
A10-6800K Gigabyte GA-F2A85XN-WIFI G Skill 1600 CAS9 Kingston SSD Now 60GB 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 1TB LG Slim Blu-Ray player Silverstone NT06-PRO  Widows 7 Home Premium 
PowerCase
Silverstone Sfx Series ST45SF 450W Silverstone SG05 
  hide details  
Reply
post #15 of 15
Quote:
Originally Posted by Giantmuffin View Post

Quote:
Originally Posted by REPUBLICOFGAMER View Post

ps. when water cooling the res ALWAYS has to be above the pump and the res has to go into the pump first ALWAYS so it would be


res - Dual pump-rad-cpu block-rad-back to res for a good set up tongue.gif

Thanks for the reply. I'm sorry if my sketches are sketchy. This is how I want to do it:

Res - splitter - 2 pumps - splitter - cpu block - splitter - 2 rads - splitter - res

The idea is to get a slow water loop. Would a single 300L/h pump be better if I split the loop at the radiators? (150l/ hour through the rads)

You don't want a slow water loop. Ideally you want the water to be moving infinitely fast so the water exposed to the blocks is always "fresh". Practically you only need a few gallons per minute of flow to equalize the temperature in all parts of your loop. If it helps, look at it in another way. If the water was infinitely slow (stopped) then you would have a bunch of really hot waterblocks.

You just want to hook everything up in series. Pump -> Rad -> CPU -> GPU -> Res -> (Repeat).
Edited by dr/owned - 5/30/13 at 12:37pm
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Water Cooling
Overclock.net › Forums › Cooling › Water Cooling › 2 pumps, 2 radiators, 1 cpu block