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Two Pumps in Series or Not?

post #1 of 16
Thread Starter 
Hi guys,

I am just starting with my much expected new water cooling mod on the Cosmos S, during analyzing how i can best place the two pumps (in single loop config)

Recommendations seen to run them in series, therefore,
- 1st pump outlet connects to the 2nd pump inlet
- In my drawings i had the pumps split so that the first pump would run to 2 rads (then to the CPU), then the second pump to one rad (then to the GPU).

anyone having experiences for those type of setups, running in series or split configuration? does it make any difference at all, measurable?

thanks for your help as always!

Will post a work log in progress soon...stay tuned...

Stephan
    
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post #2 of 16
One 355 for that, not nearly enough stuff in the loop, If your you were trying to cool dual xeon's and quad sli, with some hefty radiators then you may want to get a second pump.
Edited by freakman300 - 1/24/11 at 9:05pm
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post #4 of 16
I went with option 3 (rads in series with pumps in between):

Res/pump > rad > res/pump > rad > CPU > GPU

Both pumps are external on PWM (max RPM at 40C) and are mounted via UnDesign brackets to 120x25 fans. Both stay nice and cool, regardless of workload, I doubt they dump a full 6W (3W per pump according to Swiftech) into the total load. I went for redundancy, not additional head, or flow rate. Second res adds some bling, but not much else.
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post #5 of 16
Thread Starter 
Quote:
Originally Posted by freakman300;12132122 
One 355 for that, not nearly enough stuff in the loop, If your you were trying to cool dual xeon's and quad sli, with some hefty radiators then you may want to get a second pump.

Agree but i want to go for redundancy and in case one pump fails i have one spare ;-) thanks for the info mate
Quote:
Originally Posted by Daetlus;12132429 
http://www.overclock.net/water-cooling/519131-series-versus-parallel-liquid-cooling-loops.html

A link I used in making my choice.

Thanks for the link, i already bought the second pump and res, so thats why i wanted to know what the best location is...thanks
Quote:
Originally Posted by adamlau;12132824 
I went with option 3 (rads in series with pumps in between):

Res/pump > rad > res/pump > rad > CPU > GPU

Both pumps are external on PWM (max RPM at 40C) and are mounted via UnDesign brackets to 120x25 fans. Both stay nice and cool, regardless of workload, I doubt they dump a full 6W (3W per pump according to Swiftech) into the total load. I went for redundancy, not additional head, or flow rate. Second res adds some bling, but not much else.

Do i need to use the second res? i bought it already, but i believe i would not need it since i can run one only...

I am looking for the redundancy too thats why i want to integrate two pumps into one loop.

If i get you right then you have the pump in front of each rad, means, the pump/rad is in series, and then it goes to the water blocks...

Do you have any pictures to have a glimps at it :-)

Thanks for the info mate, cheers
Edited by elysion - 1/25/11 at 3:22am
    
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post #6 of 16
Sorry, late to the party frown.gif . I just finished modifying my loop and have the second pump on the side until I can figure out exactly how I want to provide it with airflow. I had the second pump mounted via a modified Infinite bracket to Z2 bracket to a rad push fan. Now I could put it back to the way it was with the pumps in series in between rads, take a snapshot and upload it, but I think you get the picture smile.gif .

192469d1296130164-guide-diy-pump-dampener-pump-cooling.jpg
Edited by adamlau - 1/27/11 at 5:00am
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post #7 of 16
having two serial pumps is great as you not only get more flow, b ut should a pump fail, the second one will keep th eliquid going - so your system doesn't overheat - kindof a fail-safe setup
    
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post #8 of 16
Someone should start a dual (or more) pumps club smile.gif ...
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post #9 of 16
Thread Starter 
how did you fit the second pump horizontal or vertical.
i was looking for a vertical mount but not sure if the pump is capable of it
do you really need a fan to cool the pumps? Thanks

+1 for anew dual pump club ;-)

post some pics of your build, looks interesting your tubing and concept...
Edited by elysion - 1/27/11 at 8:15am
    
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post #10 of 16
Quote:
Originally Posted by Daetlus;12132429 
http://www.overclock.net/water-cooling/519131-series-versus-parallel-liquid-cooling-loops.html

A link I used in making my choice.

The only posts worth much reviewing there are martinm's & ira-k's on the second page imo.


The maths in the OP is highly flawed if I'm not much mistaken.



Edit:
To OP.

Laws of pumps:

Pumps in series will double pressure. This is useful for a highly constricted systems that require a large pressure for a decent flow rate

Pumps in parallel will double flowrate. This is useful when you have a large temperature difference around your loop. It is unlikely that a home computer system will have such an issue however, and more likely that you will exceed the cooling capacity of your radiator.

I believe smile.gif
Edited by Crabid - 1/27/11 at 10:16am
    
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