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[POLL]Radiator Fans: Push or Pull?

Poll Results: Is it better for fans to push or pull air through a radiator?

 
  • 63% (93)
    Push
  • 36% (53)
    Pull
146 Total Votes  
post #1 of 22
Thread Starter 
Push or Pull

Lately I've been hearing a few contradictions on some people saying that radiator fans are able to push more air through the radiator rather than pull it from the radiator. And others have been saying quite the opposite. So I decided to make a poll and see what you guys think. Here's your chance to voice your opinions. Please vote and feel free to comment.

The Question: Assuming you have one simple layer of fans on a radiator, is it better to have them push the air through the radiator or pull the air from the radiator?



Edited by Open1Your1Eyes0 - 5/27/10 at 6:42pm
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post #2 of 22
Changed my mind after seeing this test was using an XSPC RS rad.


Edited by Seeing Red - 5/27/10 at 7:02pm
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post #3 of 22
You should keep in mind martin's conclusion after that particular test though, and that was that at higher rpm's push was better, lower pull, and in a mid range of rpm's it didnt make much of any difference.
post #4 of 22
It is not too difficult to understand the theory behind. I will attempt to explain, in my best and plain English, the basic fluid mechanics:-

When a fan spins, air passes from behind to the front through the blades. The blades rotate and a pressure differential is generated between areas of the forward facing and backward facing surfaces. Because of this difference, air is thrusted from behind to the front via the blades. Key point is: higher pressure in the back, lower pressure in the front. Air molecules are accelerated from behind.

So, when a fan is used to pull air, its rear is obstructed and it is relatively more difficult to develop a higher pressure zone. To be more precise, it is harder to develop that pressure differential.

Contrarily, if a fan is used to push air, its front is obstructed but its rear is clear. So it can formulate a higher pressure zone relatively more easier.
post #5 of 22
Quote:
Originally Posted by windfire View Post
It is not too difficult to understand the theory behind. I will attempt to explain, in my best and plain English, the basic fluid mechanics:-
When a fan spins, air passes from behind to the front through the blades. The blades rotate and a pressure differential is generated between areas of the forward facing and backward facing surfaces. Because of this difference, air is thrusted from behind to the front via the blades. Key point is: higher pressure in the back, lower pressure in the front. Air molecules are accelerated from behind.
So, when a fan is used to pull air, its rear is obstructed and it is relatively more difficult to develop a higher pressure zone. To be more precise, it is harder to develop that pressure differential.
On a pull setup, the suction (intake) has less area to suck air from due to the space taken up by the rad fins. Which in turn would mean a higher D/P would be developed across a fan, as the discharge is unobstructed. On the contrary, on the push method, the suction is unobstructed but the discharge is, which in turn results in a lower D/P. Take for instance a pump, we throttle with the discharge valve not the suction valve. If you throttle the suction, you create a lower pressure zone in the volute which causes cavitation (formation & subsequent collapse of vapor bubbles) which means a higher D/P suction to discharge. If you throttle with the discharge, you maintain a less D/P which prevents cavitation from occurring by maintaining suction pressure. Long story short...lol....I vote PULL.
post #6 of 22
I don't know much about WCing but it seems kind of obvious to me that Push would move more air. Because it's either pushing air through or sucking air through. You would want the "hard" part, ie moving air through a radiator, to be later rather than later, so that you can accumulate the momentum first, and then be press through the rad.

Hard to explain. But it just feels right in my head haha.
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post #7 of 22
Quote:
Originally Posted by Seeing Red View Post
Changed my mind after seeing this test was using an XSPC RS rad.
Unless Im reading this totally the wrong way... lower is better?

"Water Out - Air In Temperature (Degrees Celsius)"
post #8 of 22
what ever configuration you decide on, put a shroud.
post #9 of 22
ok here is the easiest way to explain this

go get a shopping trolley full it with a whole lot of crap then round around the shopping center pushing it then try the same thing but this time pulling it you should be able to see a difference just try not to let the shopping trolley hit you in the back of the ankles it hurts
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post #10 of 22
Quote:
Originally Posted by b-roca View Post
ok here is the easiest way to explain this

go get a shopping trolley full it with a whole lot of crap then round around the shopping center pushing it then try the same thing but this time pulling it you should be able to see a difference just try not to let the shopping trolley hit you in the back of the ankles it hurts

Sir, your logic is irrefutable...

Ive never seen it explained quiet that way before.
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