i think it's best run with the configuration on the left. you already explained it yourself why. coz of the different angles.
the left, you get equal flow restriction on both sides of incoming flow although the differences are pretty minor.

This post has been edited by MetalZone: Aug 1 2007, 03:06 PM

i thought ur Y joint is 120 degree angle... soli my bad...

yeah, but if run the configuration on the right will make my tubings looks cleaner, do it affect much? i need to bend some of my tubings if run the config on left, which means more difficult to route the tubings properly. Another question is, i know tht running dual 240mm radiator in parrallel bring better effects for the loop. if i run both on series will it kill the flow? the loop is pump, radiator1,radiator2,cpu block, gpu block, reservoir. i using mcp650, laing d4 pump. if run in series will make my tubings looks even neat but gotto sacrifice performance.

if i remember correctly, the Y-barb i sold u, the top of the Y is even sharper than a 90 degree angle. probably 60 degrees. i don't think the flow would like that bend, but then again, the differences might be pretty minor.

i had a look again at the pressure drop vs flow graphs of the MCR220 and MCW60
MCR220 at 1.5gpm has a pressure drop of 0.6psi
MCW60 at 1.5gpm is 0.75psi

So based on that assumption, adding another MCR220 to the loop in series is like adding a slightly less restrictive MCW60 waterblock. it doesn't appear to kill the flow that badly.

This post has been edited by MetalZone: Aug 1 2007, 10:25 PM

icic, so do u think setting up in parrallel with improper flow directions give better performance or dual rad at series? need some idea and some info before setup my loop as i gonna use it in long term, lazy to redid the loop as this semester are quite pack for me and i'll do it nxt week as having midterm break.

I'll frankly say I can't say for sure.
we know that higher flow rates contribute to higher efficiency, so with any component, whether the rad, or waterblock will perform better with higher flow rates. however, in general terms, radiators don't benefit from that much from increased flow rates; in fact much less than current waterblocks.

overall flow rates will be slightly higher with parallel rads. thus flow rates thru the waterblocks would be higher. but flow rate thru each of the rads alone will be halved.

in a serial rad setup, overall flow rate is slightly lower, that is, the waterblocks too. but the flow rates thru the rads are now equal to the rest of the loop.

which will perform better you say? to be sure, we're gonna need someone to test for real or do computational fluid dynamics. i'd GUESS with setups with less pump head pressure, running a parallel rad setup will benefit more, whereas with high head pressure pumps, the difference may not be so apparent.
you probably can get away with a serial setup since that's more sensible for your tubing routing needs.

UPDATE:
http://www.xtremesystems.org/forums/showthread.php?t=145954
Read up this thread for further info.
I had totally forgot about the Delta T (temperature differential between water temp and ambient temp) of the radiators, and in this case, parallel wins. radiators are more efficient the higher the delta T is. with parallel rads, both rads have the same Delta T. whereas, with rads in series, the second rad will have a lower delta T than the first because the water temp has already been lowered by the first rad.

This post has been edited by MetalZone: Aug 3 2007, 12:09 PM

MTZ sifu, need some advise from you. Like I told you yesterday, I obtained my modded Alphacool block for GPU and it is a high restrictive block. So I am planning to add another 655 pump after my CPU Block. But I am not sure how effective is it and will those heat produced by the pump affect the temp my entire setup. Below my current setup. Res > Pump > Rad > CPU Block > Res

Thanks

I believe you can get away with just adding the alphacool nexxxos xp into the loop (after cpu block of course) since the FuZion isn't very restrictive, and the PA is one of the least restrictive rads around.

@irangan.. what casing do u use?? thinking of that casing for my WC too.. currently run without casing a.k.a bogel..

Thanks for the heads up.

Lian Li V2000B Plus II.

ok thanks for the info bro, i think i'll go for series setup as the difference is small and i'll choose more convinient and easier setup.

irangan,
can that case having 2 x 240mm running in parallel side by side at the bottom of the case??? i'm running dual 240mm rads n i have not much idea what casing i can use so i send my tower casing to my fren for mod... how much is the lian li casing???

That case cost RM958 ....

I don't think it could fit a 240mm fan nor rad as the case's width is about 21cm only ...

anyway what do u guys think about this small babe for simple PC setup ..

Swiftech Compact H20-120 CPU Cooling Kit

I think it's pretty decent for a single waterblock(CPU) loop.
I wouldn't advice adding too much heat load to as you'll end up with mediocre performance only. You might wanna look out for the 2x120mm version soon.

hmm .. actually I never want to place a full wc set into the case to cool off GPU and CPU ...

I'm just looking to cool off either one ... it's just to massive to cool off the two component ... since dual or triple rad would be needed ...

anyway seems like u got insight that there would be dual rad version for this type of kit ... am I right ??

coz ur last statement sounds possible alternative ...

yes, swiftech is coming out with a version 240mm rad... with that u can coolf of the ur gpu too i guess...

err guys...my gigabyte 3d galaxy pump broken already....where can buy nirox p2800 within sunway/puchong/bangi area arr??? any recommended shop???

try contact metal zone, or u can get the oem pump from uglyvamp. If got extra money go for D5.

MTZ; i'am using antec P160. Can i use some WC for CPU ?

Bro, wrong thread to discuss this. Discussions and questions should go here: http://forum.lowyat.net/topic/180866/+1780
But to answer your question anyway, yes you can. You could mod the top panel. Please discuss further via pm or in the aforementioned link.