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Fans on the radiator

post #1 of 6
Thread Starter 
1. What's the optimal way to place the fans for an one-side solution? Having the radiator on the top the case, should the bottom fan be blowing on the radiator or should the fan be placed on-top of the radiator? Blowing on, or for that sake blowing out.
To keep in mind here that the case temp is warmer than the ambient room temperature, so having a fan on top and getting air outside the case could be preferred.

2. What's the optimal way to place the fans for a two-side solution? Having the radiator on the top of the case, the bottom fan blowing on the rad, but the question is how should the top fan be blowing? On the rad, or out of the rad?
post #2 of 6
The established terms for what you're talking about are "push" (a fan blowing air through a radiator across the fins) and "pull" (a fan taking its input air through the fins and blowing it away from a radiator).

In most cases, push is better than pull. The most common exceptions are when using shrouds of a sufficient size.

To answer your last question, for fans on both sides you absolutely want them "push-pull" so the airflow is always travelling in one direction. "Pull-pull" or "push-push" would result in almost no air flow across the rad fins and would give terrible results.

In case you were wondering, push+pull is better than push alone, too.

BTW far more relevant than the difference in air temp inside and outside the case is the delta between air temp on the input side of the fan and the water temp inside the radiator.

For a ton of extremely useful data on this and pretty much every other watercooling subject, check out http://martinsliquidlab.org/
Edited by threephi - 3/20/13 at 10:26am
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post #3 of 6
For my Prodigy build, I have the rad on top with fans pushing air from the outside into the case. I get better temps than pushing air from inside the case through the rad.
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by Zero383 View Post

For my Prodigy build, I have the rad on top with fans pushing air from the outside into the case. I get better temps than pushing air from inside the case through the rad.

Worth mentioning is that when you push air into the case, your case temp will raise duo to the heat from the radiator. You might get better temps when you push air from the outside into the case, as ambient temperature will provide better cooling to your rad. So in that case you will get better temps on your CPU and the other parts that come from the start of the loop. But your GPU may suffer more, as it's probably the last cooled part in the loop, due to higher case temp.

To overcome this, a good case cooling setup is significant. A side fan blowing towards the motherboard and a rear fan that is pulling air out of the case.
Edited by nicoliani - 3/21/13 at 10:34am
post #5 of 6
Thread Starter 
How much resistance will the top barrier create? Should I instead attach the fans on top of the radiator inside the case? The fans will be pushing air from outside.

27-Top-Fan-Openings.jpg
post #6 of 6
The effect of the grating is negligible. It will probably be a lot easier to install the fans & rad together under the grating inside the case proper instead of sandwiching the grating between them.
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