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2 different pumps in loop?

post #1 of 7
Thread Starter 
Working on my loop before my case gets here on Tuesday and I'm using a MCP355 pump mounted under a Aquacomputer Aqualis DDC 150 ml res. in the order below.
http://www.performance-pcs.com/aquacomputer-aquacomputer-aqualis-ddc-150-ml-g1-4.html

The first 360mm would be mounted in the bottom of the case and the 240mm rad. on the side mount bracket with the other 360mm at the top of the case. All but the 240mm with be push/pull and all radiators will be pulling air from inside of the case. The 2-140mm stocks in the front and 2-140mm stocks in the back will be pulling outside air into the case to feed the rads.

Pump/Res.
Black Ice Nemesis L-Series 360mm Xtreme Radiator, 54mm thick (bottom)
Black Ice Extreme 240mm, 40mm thick (side)
Powercolor R9 290X LCS with factory installed EK full cover water block (may add a second card later)
Black Ice Extreme 360mm, 40mm thick (top)
Swiftech Apogee XL CPU block
Back to the res.

I have an MCP350 pump with an XSPC top not being used and I was thinking about installing it inline after the 240mm rad. to help with the flow after those first 2 radiators.


Would there be any advantage to this setup?

Would the weaker 350 pump cause problems for the 355 pump in the long run?


Thanks
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GrandPa's Gamer
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post #2 of 7
You shouldn't have any problems, unless you put the weakest pump right after the more powerful one, but that would be pointless smile.gif
post #3 of 7
Thread Starter 
Quote:
Originally Posted by d3viliz3d View Post

You shouldn't have any problems, unless you put the weakest pump right after the more powerful one, but that would be pointless smile.gif

Yeah right after the stronger pump would not be a good idea. But I'm thinking the flow would be reduced a little after going through the first 360 and then the 240 radiators and then the MCP350 would help boost it a little.

Thanks
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GrandPa's Gamer
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post #4 of 7
Quote:
Originally Posted by By-Tor View Post

Yeah right after the stronger pump would not be a good idea. But I'm thinking the flow would be reduced a little after going through the first 360 and then the 240 radiators and then the MCP350 would help boost it a little.

Thanks

To be honest I think that all those rads are overkill just for a CPU+single or dual GPU setup. I'm handling the same configuration (i7 2600k + GTX580) with a single 360 rad, 2 of them are more than enough in my opinion. You could ditch the 240 one.
post #5 of 7
Thread Starter 
Quote:
Originally Posted by d3viliz3d View Post

To be honest I think that all those rads are overkill just for a CPU+single or dual GPU setup. I'm handling the same configuration (i7 2600k + GTX580) with a single 360 rad, 2 of them are more than enough in my opinion. You could ditch the 240 one.

Yeah I was thinking about just using the 2-360's, but I'll have the 240 and the extra pump laying around and will have plenty of space in the Phateks Enthoo Primo case to use it.

Once I get setting it all up I'll make the call at that time.

Thanks
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GrandPa's Gamer
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post #6 of 7
Putting two pumps in a loop is fine and it makes no difference where they are placed. Putting them right next to each other is no different to having one half of the loop away. In fact having them both together, close to the res, is probably always the best option for keeping air out of pumps.

Centrifugal pumps just spin water fast. They don't really care what the flow rate is. The flow of a loop is determined by the total pump pressure created by the spinning water VS the total loop resistance. Where different components are placed does not affect anything at all.

Flow in the loop does not slow down after components. It is exactly the same along the entire loop. If you think about it for flow to be high at the pump and lower after several components would require water to be vanishing.

For these reasons a stronger pump can never overpower a weaker pump or anything like that. The pumps spin the water much faster than the water flows, especially at the flow rates possible in a loop. So a strong pump can never supply fluid to a weaker pump at rate faster than it is spinning or can output.
As an example, two pumps in a loop will provide the exact same flow rate if the first is at full speed and the second at min, or if the first at min and the second at full.
Edited by Jakusonfire - 5/22/15 at 12:08am
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post #7 of 7
Thread Starter 
I have thought about moving to a Swiftech D5 pump for this build. Just not sure the 355 DDC is up to the task with the extra rads.

Thanks
GrandPa's Gamer
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GrandPa's Gamer
(16 items)
 
Mini -ITX build
(14 items)
 
 
CPUMotherboardGraphicsRAM
4790k @ 5.0ghz Asus Maximus 7 Hero PowerColor R9 290X LCS w/Factory EK Waterblock 16gb of G.Skill Trident X 2400mhz 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 500gb, 840 EVO 250gb, 840 Pro 1... 1 TB something.. Asus CD/DVD Drive Custom Water Loop cooling CPU and GPU 
OSMonitorKeyboardPower
Windows 7 Asus 24" VG248QE 144hz, Asus 24" VE247H Razer Blackwidow Ultimate XFX Pro Black 850w PSU 
CaseMouseAudio
Phanteks Enthoo Primo Black/Red Razer DeathAdder Turtle Beach PX21 headset 
CPUMotherboardGraphicsRAM
Intel g3258 @ 4.2ghz  Asrock B85M-ITX XFX R7 250 4gb PNY 
Hard DriveOptical DriveCoolingOS
Samsung 840, 120gb SSD Samsung USB drive stock Windows 7 
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