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Cool Air In vs. Warm Air Out, aka beating a dead horse - Page 2

Poll Results: Which is better? Radiator as intake with better performance or radiator as exhaust with better case temps?

 
  • 52% (12)
    Intake, of course. You want to feed your radiators the cool air, dummy!
  • 26% (6)
    Exhaust, obviously. What's the point of dumping that heat back into your case?
  • 21% (5)
    It's a zero sum game, man. Why are we still talking about this?
23 Total Votes  
post #11 of 20
Quote:
Originally Posted by mmurray View Post

I hope. I would like more feedback. The fact is that I'm using a relatively small case (650D) and there are few other options for exhaust unless I want to push case air through a rad.

you can click the link I put in my post and send him a PM.
he is offline now as he is in the UK, I think it's late there, not sure off hand.
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post #12 of 20
Quote:
Originally Posted by jlhawn View Post

outside cool air into the radiator, I have never found the heated air from a radiator to be hot enough to cause that big of an issue inside the case.
just have good exhaust fans.


^^^this

the air passing through the radiator gets a little bit warmer as the ambient... about like 2°C if you have a very efficient exchange

Even IF the air passing through would be raised dramatically -like +10°C- the end result would still be that the temp inside the case is still not higher as it would be "on air". Almost everything inside the case is designed to operate at these elevated temps till MBTF.

Of course, keeping the stuff cooler is better.. for longlivity

So, yes, every radiator should be intake.

To get rid of the "hotter" air in the case you need at least one decent fan. Cut out the rear grille and put a (quiet) hi-flow fan inthere.

But there is more to it. Because of all the intake, you end up with a "positive pressure" case. Anything which is perforated or any gap will "leak out" the "hotter" air (and noise). Most modern cases are sieves!

Only if you have a case designed for "absolute" silence (eg Antec P180) you might have problems getting rid of the "hot" air; but that is just because silent cases run hot -its a design flaw.
But that is because most of the cases are derived from "the atx standard", which was a flawed compromise to start with.. BTX is a much better design smile.gif

EDIT:
650D ... cut out the rear grille, dont use the the pci slot blanking plates (or replace with more perforated ones) and eventually mount the PSU upside down, so its breathing air from inside the case (although only do that as a last resort)

Note:
the Obsidian is the only Corsair case I would consider for myself, IF it weren't for the fugly grille/intake on top. Look at the Fractal Design ARC to see how TOP intakes/grilles should done smile.gif



oh a warning to others who may want to chime in while invoking the "hot air rises" adagio (these posts tend to attract those smile.gif ) :
be prepared to be hit over the head with a Bernoulli biography - in a windtunnel - while wearing a pink chicken suit - after been thrown out of the basket of a Montgolfier biggrin.gifbiggrin.gif


.
Edited by RnRollie - 11/2/15 at 2:22am
post #13 of 20
There is testing that shows the advantages of intake. I have seen many people claim their way (whatever it is) is better but never any actual testing and results to back it up.

http://www.overclockers.com/forums/showthread.php/700744-AirFlow-direction-for-rads?p=7111920#post7111920

http://www.overclock.net/t/1430077/corsair-750d-owners-club/400#post_21061809

After the testing I have done I came to the conclusion that the warmer air (though usually more than just a couple of C warmer, it can be 8 or more easily, if it wasn't the rad wouldn't be doing much) coming out of the radiators is usually mostly made up for by the increased air flow rate. Higher temp at higher flow can be not a lot different to cooler temp at lower flow.

Once the really hot parts, ie the ones that come with active cooling as standard, are taken care of the remaining passively cooled parts are just not critical or sensitive.
Edited by Jakusonfire - 11/3/15 at 7:41am
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post #14 of 20
Thread Starter 
Quote:
Originally Posted by RnRollie View Post


oh a warning to others who may want to chime in while invoking the "hot air rises" adagio (these posts tend to attract those smile.gif ) :
be prepared to be hit over the head with a Bernoulli biography - in a windtunnel - while wearing a pink chicken suit - after been thrown out of the basket of a Montgolfier biggrin.gifbiggrin.gif


.

lol great reply! Thanks for that. I feel more confident in executing my original plan to employ two 280mm radiators as intake with only a single high airflow fan as exhaust, but will gladly take your advice to cut out the inside of the fan mount space at the rear of the case to eliminate as much restriction as possible.

So far, I am using all Noctua A14 iPPC 3000. Two in push at the top, 4 in push-pull at the front. Should I just get another Noctua (158.5 CFM) for the rear or do you think I would be okay with a Corsair AF140 (67.8 CFM) or Performance Edition AF120 (63.47 CFM) as the single exhaust fan?
post #15 of 20
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

There is testing that shows the advantages of intake. I have seen many people claim their way (whatever it is) is better but never any actual testing and results to back it up.

http://www.overclockers.com/forums/showthread.php/700744-AirFlow-direction-for-rads?p=7111920#post7111920

http://www.overclock.net/t/1430077/corsair-750d-owners-club/400#post_21061809

After the testing I have done I came to the conclusion that the warmer air (though usually more than just a couple of C warmer, it can be 8 or more easily, if it wasn't the rad wouldn't be doing much) coming out of the radiators is usually mostly made up for by the increased air flow rate. Higher temp at higher flow can be not a lot different to cooler temp at lower flow.

Once the really hot parts, ie the ones that come with active cooling as standard, are taken care of the remaining passively cooled parts are just not critical or sensitive.

Thanks for those links, man. That's basically what I was looking for before I started this horse-beating thread.
post #16 of 20
I think you'll be ok with the AF140... thumb.gif
although, pure on principle, i'ld go for something else... Corsair fans aren't the best in the world, no matter what the fanboys want to believe smile.gif
post #17 of 20
See the link in my signature! smile.gif
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post #18 of 20
Thread Starter 
Quote:
Originally Posted by RnRollie View Post

I think you'll be ok with the AF140... thumb.gif
although, pure on principle, i'ld go for something else... Corsair fans aren't the best in the world, no matter what the fanboys want to believe smile.gif

I see what you did there.
post #19 of 20
I can't answer... I haven't tried my setup any other way. I do think the case might matter and what might be good for one isn't good for another.

I have 5 case fans and 14 rad fans. Only one fan is for exhaust and I believe I could just turn it off. My case is cool and quiet.
post #20 of 20
Thread Starter 
Quote:
Originally Posted by Snowmen View Post

See the link in my signature! smile.gif

Great post.
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