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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

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Unread 05-10-2005, 10:26 PM   #1
WeaselBlade
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Default Running L20s in series/parallel?

I'm working on a compact gaming system, and trying to decide what to do about a pump. I've got 3 Hydor L20s on hand that I picked up cheap a while back, and I'm thinking of using two or 3 in the system; the only other pumps I have on hand are a Mag5 and Mag3, which are too bulky to fit without enlarging the case. Also, the pump would be directly above the motherboard, hardly ideal for the Mags which are AFAIK prone to leaking. And before someone says to get a MCP600/650 or a couple of the new C-systems pumps, I'm flat broke and unemployed, so its not an option. My questions are:


Are the L20s likely to be damaged by running in series?


Should I run series, or parallel? (for the pumps. the rads/secondary blocks will be in parallel either way)
Series:
T-splitter->(2 or 3 L20s in series)->WW->MCW50->DtekCore->T-splitter
_______________________________->MCW20->HC->T-splitter

Parallel:
T-splitter->WW->MCW50->DtekCore->L20->T-splitter
_____________________->MCW20->L20->HC->T-splitter



And finally, is it going to be a problem to have L20s REALLY close to stuff like the RAM, the CPU, and the HDD cables? Talking like a couple inches tops.


Any and all constructive input appreciated
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Unread 05-10-2005, 11:39 PM   #2
Brandon_Tyler
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I run two L30's in series inside my external box. The box consist of 2 chevy caprice heater cores 2 l30's 2 med speed Panflo's and nexus rheobus. Here are a few pics:
Attached Images
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File Type: jpg DSCF0033r.jpg (40.4 KB, 9 views)
File Type: jpg DSCF0034r.jpg (68.5 KB, 11 views)
File Type: jpg DSCF0031r.jpg (31.3 KB, 8 views)

Last edited by Brandon_Tyler; 05-11-2005 at 12:02 AM.
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Unread 05-11-2005, 02:31 AM   #3
WeaselBlade
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Excellent, how long have you been using them that way?
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Unread 05-11-2005, 03:23 AM   #4
Brandon_Tyler
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about 2 weeks no issues.. at all. honestly its just a band aid for a upcoming external box.
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Unread 05-15-2005, 06:51 PM   #5
Byron
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nice one, btw how come you didn't use the pumps in parallel? i've seen they gain much more power in parallel.
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Unread 05-16-2005, 05:08 AM   #6
Pajax
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I think(maybe I am wrong): Centrifugal pump do not work that way. It provides almost constant pressure. It depends on rate of rotation only. It has nothing to do with input pressure. I think serial connection is meaningless.
Paralel - much better but also almost meaningless.

I will never understand why do you need so big flow rate. I has 1LPM(0,25GPM) and temperatures looks cool.
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Unread 05-16-2005, 05:10 AM   #7
Byron
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yes but double the flow rate.
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Unread 05-16-2005, 05:17 AM   #8
Pajax
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Quote:
Originally Posted by Byron
yes but double the flow rate.
Parallel version do so. Serial don´t. Or am I wrong?
/ I have to refresh my memory .
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Unread 05-16-2005, 05:24 AM   #9
Etacovda
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Serial is better than parallel in a watercooling environment.
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Unread 05-16-2005, 06:15 AM   #10
Pajax
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Quote:
Originally Posted by Etacovda
Serial is better than parallel in a watercooling environment.
Shame on me! You are 100% right. Pressure increases with 2 or more pump in serial. I trusted incomplete equation. Sorry!
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Unread 05-16-2005, 12:58 PM   #11
Byron
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i've seen a few reviews, and they say in parallel it gives much more flow and a tad more pressure... while in series it only gave a tad higher pressure... waterblocks need more water flowing through them, hence why they preffered the higher flow pumps.
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Unread 05-16-2005, 05:35 PM   #12
Razor6
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In series the pressure doubles, in parallel flow would theoretically double but it doesn't. Look at Systemcooling’s review of the CSP 750s. In parallel, the flow only increased about 33%, probably because of the Y fittings.

http://www.systemcooling.com/cs_pump-04.html
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Unread 05-16-2005, 06:05 PM   #13
maxSaleen
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The temperature difference between the two should be minimal (couple of degrees). Since you are working with a small case, I would say use whatever configuration fits in the case. If you are worried about EMF interference, you could simply cover the pump in some sort of metal shielding (I think aluminum foil would cut it). Might look ghetto... I'd only tell you to do it if you are extremely paranoid. Make sure your system is leak free. I had problems with an L30 about a year ago (there was a leak at the inlet). Luckily mine was at the bottom of my case. One drop of water in your case, due to the proximity of the pumps, could spell disaster.
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