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Quick question from nooby

post #1 of 19
Thread Starter 
Just a quick question:

EDIT: I just realized that I have to put the rad in the front of the case do to space issues.

Is the direction (exhaust) still the same?

Thanks

I have a 4670k and 7970 i wanna watercool and have my 360 rad thats going on the FRONT of the case.

Which way should the fans be blowing to?

Im only using one rad if that matters.

Thanks a lot!
Edited by legitlegit - 3/15/14 at 7:00pm
post #2 of 19
Set them up for exhaust, with the fans between the radiator and the case wall so that the airflow gets pulled through the fins. Make sure your fans have damn good static pressure, as pressure is what is going to force the air through the fins.
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post #3 of 19
Quote:
Originally Posted by legitlegit View Post

Just a quick question:

I have a 4670k and 7970 i wanna watercool and have my 360 rad thats going on the top of the case.

Which way should the fans be blowing to?

Im only using one rad if that matters.

Thanks a lot!

 

Hey man, most times you mount a rad in the top of the case you would want it to be pushing/exhausting out the top of the case, just so your not dumping hot air in to the middle of your case.

post #4 of 19
Thread Starter 
Quote:
Originally Posted by Cyrious View Post

Set them up for exhaust, with the fans between the radiator and the case wall so that the airflow gets pulled through the fins. Make sure your fans have damn good static pressure, as pressure is what is going to force the air through the fins.

Alright thanks for the response!

I'm not sure if my fans have enough static pressure from my fans , their nzxt ones but I already made a order for gt's, but their not coming till much later for some reason.

What would happen if there isn't enough static pressure tongue.gif?

Thanks again
post #5 of 19
Thread Starter 
Quote:
Originally Posted by Buttsy View Post

Hey man, most times you mount a rad in the top of the case you would want it to be pushing/exhausting out the top of the case, just so your not dumping hot air in to the middle of your case.


Alright thanks a lot!
post #6 of 19
But what about fans sucking in cooler air from outside and then thru the radiators? I have this idea, thats why I mounted radiator on the bottom so the fan suck cold air (usually cold air is in the bottom) thru the radiators and then out of the case. Then the OP can just have a sidefan blowing out hot air from the case, or if he was a fan in the back, that can will be blowing out hot air from the case anyways.
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post #7 of 19
Quote:
Originally Posted by legitlegit View Post

Alright thanks for the response!

I'm not sure if my fans have enough static pressure from my fans , their nzxt ones but I already made a order for gt's, but their not coming till much later for some reason.

What would happen if there isn't enough static pressure tongue.gif?

Thanks again
If there isnt enough static pressure in a push situation, where the fans are blowing into the fin array, the air "piles up" in front of the fins, slowing down and bleeding out of every gap possible before passing through the fins, including bleeding back through the fan blades themselves. If it is in a pull situation, the same happens in reverse: the fans are starved of air and due to the lowered pressure on that side, sucking in air from every small gap possible to try and even out the pressure difference. On top of that, the fans spin faster due to the lowered air resistance from the drop in pressure, which in turn create more noise.

With a fan with higher static pressure, it can force more air through dense fin arrays, delivering more cooling and preventing air from bleeding back through the blades. If the fans in question have broad fan blades as well as stator vanes immediately behind the blades, these help immensely in increasing static pressure. Its actually why jet engine compressors have stator vanes in the compressor case. They help boost pressure and greatly reduce air's tendency to flow the wrong way back towards the area of lowest pressure i.e the intake.

Just keep in mind, with few exceptions fans with stator vanes are noisy.
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post #8 of 19
Quote:
Originally Posted by PachAz View Post

But what about fans sucking in cooler air from outside and then thru the radiators? I have this idea, thats why I mounted radiator on the bottom so the fan suck cold air (usually cold air is in the bottom) thru the radiators and then out of the case. Then the OP can just have a sidefan blowing out hot air from the case, or if he was a fan in the back, that can will be blowing out hot air from the case anyways.

 

Hot air rises, so it is counter productive to have the fans sucking in air from the top and trying to push down to exhaust out the side which is lower, any side fans venting will exhaust hot air out and will rise and part portion will be sucked straight back in the top.

 

If the OP has the ability for side fans they are better as intake, blowing cool air over components and then having fans exhaust thru the rad out the top. Being nowhere near as counter productive.

Quote:
Originally Posted by legitlegit View Post


Alright thanks for the response!

I'm not sure if my fans have enough static pressure from my fans , their nzxt ones but I already made a order for gt's, but their not coming till much later for some reason.

What would happen if there isn't enough static pressure tongue.gif?

Thanks again

 

How thick is your rad? thicker and thinner rads seem to run better with different levels of static pressure. For example, my 30mm 360 rad works better with my Corsair SP120s running around 1100rpm-1500rpm, over and above that it doesn't make any real difference to temps if I pump them all the way up to 2400rpm.

post #9 of 19
what case do you have? and if you only have that 1 rad, yep, exhaust.
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by Cyrious View Post

If there isnt enough static pressure in a push situation, where the fans are blowing into the fin array, the air "piles up" in front of the fins, slowing down and bleeding out of every gap possible before passing through the fins, including bleeding back through the fan blades themselves. If it is in a pull situation, the same happens in reverse: the fans are starved of air and due to the lowered pressure on that side, sucking in air from every small gap possible to try and even out the pressure difference. On top of that, the fans spin faster due to the lowered air resistance from the drop in pressure, which in turn create more noise.

With a fan with higher static pressure, it can force more air through dense fin arrays, delivering more cooling and preventing air from bleeding back through the blades. If the fans in question have broad fan blades as well as stator vanes immediately behind the blades, these help immensely in increasing static pressure. Its actually why jet engine compressors have stator vanes in the compressor case. They help boost pressure and greatly reduce air's tendency to flow the wrong way back towards the area of lowest pressure i.e the intake.

Just keep in mind, with few exceptions fans with stator vanes are noisy.

Thanks a lot for the info!

So if the static pressure is not enough, will this cause damage to the rad at all? Or should I wait till my gt's come?

Thanks again
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