Black Ice vs DD Cooling Cube

[JML]

How do these two compare to each other, (let's assume they are both using a single YS-Tech fan)?

And how much of a temp drop should I expect if I used a higher CFM fans like 120mm Sunons (108cfm) instead of the Panaflo L1A fans I have now (70cfm) on my DD cube (one is on intake, one on out-take).

If the Black ice is any better I'm gonna split the flow between the cube and black ice radiators (high flow in block, lower flow in radiators)

[ButcherUK]

The black ice is generally a bit better than the DD cube (source: Bill's radiator article). Definitely worth running both in parallel if your temps are much above ambient.

[BillA]

JML, work on using the info in that article

look at the pressure drop of the 2, the DD Cube is 1/2 that of the Black Ice
so it will be difficult to equalize the flow between the 2
- if you assume that your pump has the pressure capability to drop, say 1/2 psi across each (and such an assumption may NOT be warranted, depends on your pump);
then read the graph horizontally and you will see that the DD C has about 0.7gpm and the BI about 0.4gpm for a total system flow rate of 1.1gpm

I don't know what your pump is, nor what your other system components are, but 1.1gpm is probably much higher than what you have.

take a different approach:
see what you have to do to get a (total) system flow rate of 0.6gpm (very desirable due to the cooling "spike" shown in the DD C's dissipation graph)

now if at the same time you can push about 70cfm through the DD C (air flow taken off the backpressure/air flow graph), you'll have it doing more cooling than the BI (with the same flow rates)

so what fan will it take to push a REAL 70cfm AT a backpressure of 0.15in.H2O ?
now it gets a bit tricky; as stated in the article, high output at higher backpressure is difficult and the typical fans won't hack it
-- looking at the P-Q fan curves in an ORION fan catalog,
the ONLY suitable candidate is a 120mm, thick bodied, high speed 120VAC fan (model #OA109)
(120VAC fans have higher torque, can push against a higher backpressure)
[you probably want to put the fan outside your case]

start the whole process by verifying your pump's flow capability through the whole system exactly as it will be, in the case

look hard at your waterblock, all connection sizes, right angle fittings, tubing size
to optimize the DD C, you have to have a flow rate of 0.6gpm

hope this helps a bit
JoeC wants a writeup on how to actually apply the info in the radiator article
I guess this is a dry run, any and all - feel free to comment

be cool

[ButcherUK]

Bill, I've been considering getting a more powerful fan for radiator cooling, would one of these (http://www.comairrotron.com/dcfans/MajorDC.htm) provide a significant improvement over two YS-TECH 120s?
Heater core style rad.

[ButcherUK]

OMG I just found one of those online for £5 ($7.50)! Definitely getting it :D

[BillA]

for sure, compare their P-Q curves

I use some big Nidecs, but at 66dba you'll not forget they're on

be cool

[ButcherUK]

yeah 54dBA isn't quiet but I'll have it on a temperature controlled PWM speed controller (electronics is a hoobby of mine), and for the price (£5+£3 shipping) it can't be beat - less than the ys-techs cost each for double airflow and much better static pressure handling :)

[JML]

Concerning the pump:
I have a Mag Drive 7 (700gph at 0 lift; 550gph at 2foot lift), anyways my dd cube is about 2feet above where my pump would be, so my flow rate would be about 9gpm (550gph divided by 60); Is this right? And how would I get this flowrate in my dd cube but keep a high flowrate in my Maze2?

Concerning the Fans:
Aren't 120vac fans normally very loud? A loud computer is one thing, but I don't want something ridiculously loud.

[BillA]

the output of the pump will define the flow rate for the system,
you can fiddle with the velocity by changing the diameter

measure the time to fill a gallon jug using the return line to the pump and divide by 60, that's the flow rate in gpm
and you can only measure it, you don't have the info to try to calculate the flow

a high speed 120VAC fan will be fairly loud (to me)
you could do as ButcherUK is describing and use a temperature controlled fan

be cool

[JML]

k thanks :cool:

[ButcherUK]

JML, just as a quick FYI, caseetc sells fans similar to the one I'm getting in 12V for $30, with a temp controller or lower voltage setup they should be a lot less noisy.

[JML]

butcher- thank yee :D