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Single / Series / Parallel?

post #1 of 5
Thread Starter 
I was thinking of getting another D5 to put in series or parallel with my other D5. However, are there any other pumps (single or dual) that are a better deal (performance / price / quietness / longevity?)
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post #2 of 5
The 50Z are supposed to be good dual pumps because of their low heat dump they spec out just a little worse then the D-5 performance...I'd just get another D-5 since you already have one...The 18W DDC's new version sucks so I would stay away from them, if you can find any of the older orange impeller version 2 18W DDC's they are good pumps...The newer 3.2 version has the blue impeller in them, they are barely better then a D-5....


Do a Google on dual 50Z in series you should be able to dig up some good info on them...


...AquaXtreme 50Z

Series seems to give the best flow.....
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post #3 of 5
Thread Starter 
I can get another D5 for $70 at Jab-tech.com. I don't need the Vario version, as I am hardly interested in slowing down my loop.
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post #4 of 5
Martin did some testing with the vario D-5 and the D-5 with-out and the non-rheo pump ran comparable to the 4 setting on the adjustable pump...So you might need to set your rheo pump to 4 to get them running at the same speed...That should be plenty anyway....
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post #5 of 5
Yeah we need some electronics guys to figure out the circuit mod needed to bring those basic D-5's up to setting 5 or more..

As far as series vs. parallel, for a typical water cooling setup, you'll always gain more from running in series, we just have too much restriction for the other to work better. Not to mention running in pararallel would require at best some Y splitters and/or a multiport reservoir to feed and combine those flows.

When you run pumps in series, you stack the pump curves vertically so you effectively double the pressure per flow rate, but you have the same maximum flow rate. When you run them in parallel you effectively stack the curves horizontally or you double the amount of flow rate per pressure unit. Parallel will double your maximum flow rate, and give you the same maximum head pressure as one pump.

The end result of the comparison makes running in series better when a system is more restrictive, and would make parallel better when using a lower restriction. As it turns out a typical water cooling setup is generally better fitting of the series condition because it is on the more restrictive side of things.

I should look into simulating a system with an MCW30 and a PA160 and 1/2" tubing. That might just be free flowing enough to where parallel would be better Not that you would ever do that!!!
    
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