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Fans for a large rad?

post #1 of 22
Thread Starter 
I have almost completed my build but it seems passively cooling my radiator will not work. Radiator is about 360 x 600mm and is supplied heat by a i7 930 @ 3.5 at 1.2v, Northbridge on a MSI X58 Pro-E, and a lightly overclocked R9 380. Any ideas for a large quiet fan or should I be considering several small quiet fans? Currently the only fans running are the PSU fan and a 120mm pointed at the GPU memory.

Currently the loop stabilizes at 46C under load with 24C ambient. I would like a little more headroom for some overclocking. Max CPU temp currently is 63C on hottest core and GPU at 58C.



Edited by viper121 - 10/31/15 at 4:19am
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post #2 of 22
How will you mount the fans to the radiator? I think the easiest way is the way to go. The largest computer fans I can see are 240mm. You might find bigger fans for car radiators... pretty sure they could work on 12v but you might need to change the connector. Although it's probably not going to be small and fitted for your needs.

Edit: Woah woah, 2010 and first post! Long time lurker wink.gif

Found out this:
http://www.amazon.com/Rexus-360mm-Silent-Jumbo-Fan/dp/B002BTQUJ8
Edited by Just a nickname - 10/27/15 at 7:04pm
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post #3 of 22
Thread Starter 
As for mounting I was thinking zip ties or to make brackets to hit the corners or the rad. I had looked at automotive fans but I think noise would be a problem even if run under 12v.

That fan looks promising and at 22db it should be quiet enough.

I thought maybe I would get more out of the forum if I posted. I have read most all of the forum biggrin.gif
Edited by viper121 - 10/27/15 at 7:23pm
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post #4 of 22
Automotive fans are too loud AND they pull more amps than your average PSU can provide wihtout melting down smile.gif


The problem with the suggested Rexus fan is that it lacks the static pressure for use on a radiator. You'ld probably be better of with a handfull of relative silent 120mm fans
post #5 of 22
with 300x600, I'd put 8 140mm fans per side for 280*560. You won't have much space wasted.
post #6 of 22
Quote:
Originally Posted by Duality92 View Post

with 300x600, I'd put 8 140mm fans per side for 280*560. You won't have much space wasted.

The fans won`t be supported on their edge. Unless he makes a shroud, I doubt zip ties will do the trick. Plexi-glass is easy to work with and could make a shroud but that will requite a bit of free time and the right tools. For 20-30$, if he can find a better 360mm fan, I think this is the easiest and cheapest way to go IMO. He's only cooling his cpu / gpu? if then he doesn't need more than a big fan or 2-3 120mm.
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post #7 of 22
Quote:
Originally Posted by Just a nickname View Post

The fans won`t be supported on their edge. Unless he makes a shroud, I doubt zip ties will do the trick. Plexi-glass is easy to work with and could make a shroud but that will requite a bit of free time and the right tools. For 20-30$, if he can find a better 360mm fan, I think this is the easiest and cheapest way to go IMO. He's only cooling his cpu / gpu? if then he doesn't need more than a big fan or 2-3 120mm.

Put the tie wrap right through the fins with a washer on the other side. This is how it was done back in the day with heater cores.
post #8 of 22
I don't think yyo need to go from no fans to loads of fans.

A relatively small number of fans running slowly will still give you a decent drop in temperature in comparison to passive.

A couple of 140 or 200mm low rpm fans might be all you need, a shroud would make a big difference.

You can make a basic shroud from cardboard and tape to test the concept.
post #9 of 22
Wow, that is one huge radiator! If you have free space available around your computer, you may not need to give up on passive cooling it. Try building a "chimney" of sorts on top of your radiator so that there is a large column of heated air above it to create the pressure difference you need for effective cooling. The key to good convection current will be the height between the radiator and the top of the exhaust outlet.

http://sustainabilityworkshop.autodesk.com/buildings/stack-ventilation-and-bernoullis-principle

https://en.wikipedia.org/wiki/Stack_effect
post #10 of 22
Quote:
Originally Posted by CastleBravo View Post

Wow, that is one huge radiator! If you have free space available around your computer, you may not need to give up on passive cooling it. Try building a "chimney" of sorts on top of your radiator so that there is a large column of heated air above it to create the pressure difference you need for effective cooling. The key to good convection current will be the height between the radiator and the top of the exhaust outlet.

http://sustainabilityworkshop.autodesk.com/buildings/stack-ventilation-and-bernoullis-principle

https://en.wikipedia.org/wiki/Stack_effect

Totally forgot about this (I hated anything relating to thermodynamics and ventilation!). This would be epic.
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