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Dual Serial DDC and ridiculous loop lengths.

post #1 of 8
Thread Starter 
Hello.
Right now I'm working on some quite conceptual PC design that requires enormous length of water cooling loop (about 12 meters of unrestricted 10mm ID). I'm not too familiar with water pump properties so I thought you guys can help me with that. I have only two blocks in the system (GPU+CPU) and Dual DDC pumps with Bitspower tops connected in serial. Would it be enough for normal operation or I should change them to something or connect differently?
Thanks a lot for your attention.
post #2 of 8
Dual pumps connected in serial will double the head pressure. This will allow you to push the water through twice as much "stuff"
There is a formula for pressure loss through a tube:

dPressure = (pipe friction coefficient) * (Length/Diameter) * (density/2) * (v^2)

Unfortunately because pumps operate on a Flowrate/Pressure Head curve, you would need to recalculate several times to reach the limit of the function. You would also need to calculate the friction coefficient using the reynolds number, which varies with velocity.

TL:DR The easiest way to find this solution is to just buy the tubing and test it out. If you have a big reservoir, put the intel in the top so you can visualize (maybe even take video for reference) the difference in flowrate.
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RPI Compy
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post #3 of 8
Thread Starter 
I've used DDC curves in Solidworks Flow Simulation (just placed it as an "internal fan" into the liquid volume) and it showed me that it's going to work just fine. But yeah, would be better just to buy a long hose and test it for science sake smile.gif
post #4 of 8
They should do the trick, but if you haven't purchased them yet, I would opt for a D5 Vario. Even one of those should do it.

I would get a flow meter to make sure things are working as intended.

http://koolance.com/coolant-flow-meter-stainless-steel-with-temperature-sensor-sen-fm18t10
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Jarvis
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ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump Bitspower D5 Mod Top V2 Pom version 
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post #5 of 8
Thread Starter 
Unfortunately D5 does not fit into my design (literally, too big frown.gif ), was my initial choice. Yep, flow meter is a must-have in such tricky situations, thanks for the suggestion.
post #6 of 8
I once put 20 meters of garden hose onto a single ddc 18W pump, and can tell you that it is not a problem smile.gif
post #7 of 8
Quote:
Originally Posted by Zhilin View Post

Unfortunately D5 does not fit into my design (literally, too big frown.gif ), was my initial choice. Yep, flow meter is a must-have in such tricky situations, thanks for the suggestion.

So what are you planning?

Sounds interesting, massive amount of hose and very little space.
post #8 of 8
Thread Starter 
Quote:
Originally Posted by Holst View Post

So what are you planning?

Sounds interesting, massive amount of hose and very little space.
Unfortunately I can't tell you specifics about the build at the moment 'cause there is some commercial interest involved, but be sure I'll post a complete build log here as legal issues will be resolved! What I can say for sure: it won't be like anything you've seen yet biggrin.gif
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