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Can a fan pull air trough a radiator? - Page 2

post #11 of 30
the rad would act as a shroud, eliminating the dead spot in front of motor on fan. g.gif
post #12 of 30
martin has tested push vs pull vs with/without shroud at different fans/speeds. Push was slightly better at higher rpm range, pull slightly better at lower rpm range. Test was here
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post #13 of 30
Quote:
Originally Posted by opt33 View Post

martin has tested push vs pull vs with/without shroud at different fans/speeds. Push was slightly better at higher rpm range, pull slightly better at lower rpm range. Test was here

i dont see that being very truthful in a way seeing as ive done the shroud stack myself on rads,i have not seen it make that kind of difference.

im running 2 fans in pull on my RS240, its doable, and efficient
post #14 of 30
Quote:
Originally Posted by risiss View Post

the rad would act as a shroud, eliminating the dead spot in front of motor on fan. g.gif
Quote:
Originally Posted by tuffarts View Post

Could be better in theory, as the rad would act as a shroud, eliminating the dead spot in front of motor on fan.
But as said before not a lot of difference.
Quote:
Originally Posted by risiss View Post

the rad would act as a shroud, eliminating the dead spot in front of motor on fan. g.gif

Without an actual shroud it won't. It will be pretty much the exact same. The fan motor is still the same amount of distance from the fin array in either a pull or a push setup, so unless you actually move the fan further away from the fin array, you don't eliminate any dead spots really. Maybe a TINY TINY TINY bit, but nothing worth doing anything about it.

As for push or pull being better than the other... Any and all test conclusions done on this have not only been conflicting across multiple sources, but the gains seen from either setup over the other is so minimal it can be attributed to environmental variables.

A very thick fin array with a 38mm thick fan may see a difference between push/pull though, most likely due to the increase in pressure from a push setup and the decrease in pressure from a pull setup, the increase in pressure will also increase heat transfer slightly whereas the decrease in pressure from a pull setup would slightly increase temps. This is all theoretical of course because the difference in temps can't be measured accurately enough nor can the conditions in which they are tested be identically reproduced without great effort.
Edited by Shrimpykins - 1/3/12 at 8:49am
 
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post #15 of 30
I've always believe in a pull configuration over push. Considering both configurations the fans are tightly fitted to the radiator in a pull configuration the fan is able to draw air immediately around the radiator rather then gather the air on the intake side of the fan and force through it self and the radiator in front of it. Its always made sense to me considering if you put your hand in front of the intake side of a fan the air is less turbulent then the focused blast on the exiting side even tho the exact same volume is going in as is coming out. The turbulent air being forced into channels could never be as efficient as negative less turbulent pressure being drawn between the channels of the radiator. Thats just my belief.

A push pull config is obviously going to be best.
Edit: I should say a lot of these more modern radiators are meant for low cfm so does it really matter?
Edited by DigitrevX - 1/3/12 at 9:03am
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post #16 of 30
I run my fans on my Silver Arrow as Pull rather than the default Push as my VRM-G2 gets in the way so I cant use my fans as push.

The temps are exactly the same.
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post #17 of 30
No you just put fans on a radiator for the hell of it.
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post #18 of 30
Quote:
Originally Posted by lifeisshort117 View Post

interesting. i always thought it went push/pull > push >pull.
i assume the differences are more diverse with low flow rads versus high flow rads?

Too many variables to simplify it like that. The fans and radiators used will be the real determining factors. I generally go with pulling on low air flow and pushing on high airflow...mainly because the radiators I have seem to stay dust free longer in that configuration which will effect performance more in the long term unless I want to be cleaning more often. Temps will largely be the same on day one though.
Edited by Vagrant Storm - 1/3/12 at 9:14am
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post #19 of 30
Even if the temps would or wouldn't be the same at least the dust will accumulate on the radiator in a spot you can clean with a pull config rather then between the fan and the rad with a push and you have to pull the fan off!biggrin.gif

I remember having to do that every month and pull the fans off with my old push config
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post #20 of 30
Quote:
Originally Posted by SoliDD View Post

if you are doing p/p that would be optimal, you always your stronger fan pushing

As far as I've been told, if you run two fans at different RPM at one another (or even different CFM ratings), the stronger one will kill the weaker one by making it run too fast (forcing too much air through it), destroying the bearing and cutting the lifetime down by about a tenth.
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