two pumps in series

craarc

craarc

craarc

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2 Feb 2012
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and before anyone says why not by this pump or that pump instead im doing it to try something out

anyway just ordered a ek dpc4 to add into a system with a dcp2.2

going to run them in seires dcp2.2 at tiop of loop and the dcp4 at the bottom just to see what the additional slosh factor of the water in my top res is

going to run the top res half full and see what sort of turbulence in it i can create

so the loop from pump will be

external 2.2pump > cpu block (thru case and 1m of pipe)(soon to be inserted gpu block here) > internal tube res > internal 4pump > (thru case 1m of pipe) > external rad > external half full res so i can see the turbulance and flow rate > small pump header tank about a foot below the top res,

so in effect the small pump will super charge the lower one even tho there is a distance between them i didnt want to put one right in front of the other to start with i may do after to see what diference it makes


cant see it causing any problems with the pumps ive worked with that theory with large capacity high pressure pumping systems before where a small pump charges the main pump and improves overall system flow

i can also run it as a open loop system if need be to compare cooling but initially it will be closed
any one see any probs?
 
Sounds interesting, only thing I would have done maybe is have the same speed pumps, but it may work out fine, your loop is a unique setup so with the distance between them it might not be an issue.
 
yer its sort of an experiment in other industries a small pump is used to provide like a precharged flow to a larger one like a supercharger idea and this then helps the larger pump perform much more effieciently. so im wondering how this will effect a closed loop as it were i can always pop the top of one of my resevoirs at the top of the system to compare closed and open

im really interested to see how the flow is effected if at all ? if not ive got a spare pump for use somewhere in the parts bin .... tbh the ek4 is only 30 odd quid so it dont matter it dont make to much diference i will swap it out wihth the 2.2 and compare them in the same system also

as you know im sort of a fan of using a small pump in a large volume system so this will give me some pratical comparisons rather than just looking at figures on a spec sheet
 
Understand, should be interesting :) Not sure if you've tried the EK4 before but its a lot noisier than the 2.2 vibration wise, make sure you have a gel pad or something like it to isolate it from any hard surface.
 
yer all my panels are covered in foam any way but the 2.2 is in an external box the 4 will be in the main pc .. tbh i dont hear anything as i only use my pc with headphones anyway tbh

but will do a sort of comparison between the 2

if its to noisey i will chuck it ....
 
I suppose this would depend on the pressure inside the pumps themselves. As in are they pressurized inside.

I would imagine they'll both end up running at the smaller pumps speed without some sort of release valve.

small pump > low pressure > large pump > high pressure > small pump.
 
mixing pumps is not usually a good idea.
Your supercharger comparision dosn't really work as the system is a loop.
where as superchargers are in a linear flow system.
 
Putting the two will give you higher pressure and thus a higher flowrate. Not to sure on the pump specifics, but putting a smaller pump in series tends not to give you that much of a boost, over the single big pump.
 
Adding the second pump also dumps in some extra watts into the loop, who knows if this is offset by the flow increase, probably not by much if at all if it is a small pump.
 
shadowscotland said:
mixing pumps is not usually a good idea.
Your supercharger comparision dosn't really work as the system is a loop.
where as superchargers are in a linear flow system.
Click to expand...

martin did some testing with parallel and serial pumps and he found that even with mismatched pumps the pressure curves basically stack on each other so in high restriction loops it works exactly like the supercharger comparison
 
I ment to add more to my post but got called away.
What I was going to say is it can cause damage to the smaller pump in the long term (over rotation)
In a high restriction loop where the flow is significanly reduced this will not be an issue.

Off to check out martin's data - nice to know he agrees (but the risk of missmatched pumps overspinning is even less that I thought)
 
Last edited:
okie here is an update

i have a reasonable increase in flow rate as expected and so far using sensors in the same positions as previously i have 1 degree of reduction in water temp compared to cpu temp . meaning i have more diference between the 2 of one degree and also have noticed a reduction overall of approx 1-2 degress but that may well also be down to lower ambient temp as today it is cooler than it has been and i have actually turned the AC down a bit

so i cant say for sure if it has improved overall cooling by a significant amount

turbulance is the highest diference in the top resevoir which has an airgap so i can see what it is doing.

i cant see a problem with the pumps at all they are both near as silent tbh and both the 2.2 and the 4 hardly murmour even with the case open i can hardly hear the 4 with my ear nearly next to it . i havent secured it i cut the pipes so the actual pipe tension and weigh holds it in place on a noise reducing mat which i use on all my non see thru panels ( the base of the case)

so in a closed loop i cant see any negatives the smaller pump doesnt seem to have any adverse effects on it

i will try and turn it off completly in the loop and see how the turbulence suffers with just the larger one

btw i found out today ek do a version 2.6 dcp.

so is it better ? well its nicer to see more water movement in the res will need a longer term look at it tbh to see if there are other benefits / negatives time will tell.

gonna play with a few things and see over the next week

added

heat dump into the loop i dont think is a prob as i have so much external pipework which also acts as a passive cooler ..
 
added when i checked my pipework masterkleer with mayhems blue pastel i am getting some discoloration now on the pipework so maybe the masterkleer isnt as good as originally thought


so next month its gonna be tygon i guess as thats the only one i beleive no one has had problems with is that right ?
 
Tygon, well, a little birdie told me in testing its the same as Primochill, I've had great luck with XSPC tubing at 1/2" and 7/8" and have been informed its good stuff.
 
well i dont mind what i buy as long as i dont get any dixcoloration


weird that i only noticed it on this build not last one but there is definatly a white film today on inside of tubing nothing on resevoirs at all so it tube leaching i guess

so xspc clear you reckon ?
 
ok thx

tbh i dont think its an imediate problem so over the next couple months i will replace my 9 metres of pipework i guess. more fun with stuff is the xspc resistance to kinking ok ?

sayin that i can always buy some more 45 and 90 degreee fittings i guess
 
Not had too much of a problem as its thick walled, 1/2" ID - 3\4" OD (13-19mm) Tubing

Depends how hard you want to bend it :) This is as tight as I went.
P1160640.jpg
 
well just ordered 9 metres of xspc 13/19mm clear so will see how that does will swap out all of my masterkleer blue when it arrives and take some pics of the masterkleer discoloration bizarre that originally i didnt have any discoloration or milking for ages but now its getting a milky layer inside it pita. i will have to use some 45 and 90s in there especially in my control box just ordered some new phobya alluminium allen keyed hose clamps also as they are so neat so i will use some of those some black compresions depending on where in the build they are
 
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