Another Possibly Stupid Question

SlipoftheKnife · 03-30-2008, 06:32 PM

Would it be effective to put three 120mm fans on the bottom of the radiator facing the same way the three on top do? Here's a graphic

pHaestus · 03-31-2008, 09:07 AM

Hi

I tested this out with a single black ice extreme, and tried it with and without fan shrouds too. For the life of me I can't find the original damn post I made about it, but the info is referenced (and discussed) here:

http://forums.procooling.com/vbb/showthread.php?t=10513

Basically the gains are so small compared to the massive increase in noise that it's just not worth bothering.

billbartuska · 03-31-2008, 09:49 AM

Quote:

Originally Posted by SlipoftheKnife

Would it be effective to put three 120mm fans on the bottom of the radiator facing the same way the three on top do?

Not a stupid question at all. Yes, adding more airflow (never mind how it's done for now) will increase cooling. But the answer to how much air flow and how much cooling is "It depends".

The attached chart for an older ThermoChill series seems to indicate that water flow rate, air flow rate and heat dissipation are related, as one would expect!

Note the conclusion that can be drawn from the graph:
At low water flow rates increased air flow has a minimal effect.
A high water flow rates increased air flow has a large effect.
Increacing the air flow beyond a certain limit yields diminishing returns at any water flow rate.

So, which part of the curve for your rad are you on now?

oh BillA.................

pHaestus · 03-31-2008, 10:56 AM

The noise increase from using 2 fans in push/pull is HUGE compared to the temp gain (if any).

SlipoftheKnife · 03-31-2008, 10:59 AM

I'm using a Black Ice X-Flow Stealth GTS 360 Radiator with a Swiftech 655 and 3 120mm Scythe fans

ben333 · 03-31-2008, 05:04 PM

Again, if you don't care about noise and want cooler, do it. But really, its not worth it unless you don't mind the noise.

jaydee · 03-31-2008, 05:17 PM

Quote:

Originally Posted by pHaestus

The noise increase from using 2 fans in push/pull is HUGE compared to the temp gain (if any).

100% agree.

3 fans one one side should be more than enough anyway. Doubtful 6 would gain much.

03-30-2008, 06:32 PM	#1
SlipoftheKnife Cooling Neophyte Join Date: Feb 2008 Location: Bridgewater, MA Posts: 16	Another Possibly Stupid Question Would it be effective to put three 120mm fans on the bottom of the radiator facing the same way the three on top do? Here's a graphic

03-31-2008, 09:07 AM	#2
pHaestus Big Player Making Big Money Join Date: Aug 2001 Location: irc.lostgeek.com #procooling.com Posts: 4,782	Re: Another Possibly Stupid Question Hi I tested this out with a single black ice extreme, and tried it with and without fan shrouds too. For the life of me I can't find the original damn post I made about it, but the info is referenced (and discussed) here: http://forums.procooling.com/vbb/showthread.php?t=10513 Basically the gains are so small compared to the massive increase in noise that it's just not worth bothering. __________________ Getting paid like a biker with the best crank... -MF DOOM

03-31-2008, 10:56 AM	#4
pHaestus Big Player Making Big Money Join Date: Aug 2001 Location: irc.lostgeek.com #procooling.com Posts: 4,782	Re: Another Possibly Stupid Question The noise increase from using 2 fans in push/pull is HUGE compared to the temp gain (if any). __________________ Getting paid like a biker with the best crank... -MF DOOM

03-31-2008, 10:59 AM	#5
SlipoftheKnife Cooling Neophyte Join Date: Feb 2008 Location: Bridgewater, MA Posts: 16	Re: Another Possibly Stupid Question I'm using a Black Ice X-Flow Stealth GTS 360 Radiator with a Swiftech 655 and 3 120mm Scythe fans

03-31-2008, 05:04 PM	#6
ben333 Uber Pro/Mods Join Date: Aug 2007 Location: New Hampshire (USA) Posts: Two hundred somethin Posts: 432	Re: Another Possibly Stupid Question Again, if you don't care about noise and want cooler, do it. But really, its not worth it unless you don't mind the noise. __________________ Pro Slacker

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