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post #21 of 35
It's just convention that's carried through in terms of fan direction and component location.. Why not bottom to top? That's how heat travels in the first place. A grid of fans on the bottom of a case without a bottom panel and an identical grid of fans on the top of the case without a top panel would be more ideal--with constant airflow across the space of the case, there would be no dead spaces and the flow direction would be coincident with heat movement. In fact, I'm sure cases like this exist already, they're just more expensive.

I think the only down-side to back-to-front cooling is PSU location in conventional cases (I mean, other than the obvious things like dead spaces and such). With the PSU at the back, if you employ back-to-front cooling, then the hot air from the PSU would just vent into the case, as opposed to directly out, which it does right now.

There are many more-efficient case designs for optimal cooling, but what we have works well enough in terms of design and cost, there's no real reason to change it.
    
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post #22 of 35
Its this reason why I sat with a couple engineering majors and spent a few hours simulating air travel with my case.

I have 5 fans in total. The top 4 are intake, and I have the front as an exhaust. Dead silent, 50C max load on everything.
 
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post #23 of 35
Quote:
Originally Posted by TitaniumClocker View Post
Its this reason why I sat with a couple engineering majors and spent a few hours simulating air travel with my case.

I have 5 fans in total. The top 4 are intake, and I have the front as an exhaust. Dead silent, 50C max load on everything.
interesting...you have four top side fans pulling air in, and one front as exhaust? i'm curious to know what sort of effect that has on your PSU, did you realign it so it would be blowing out the front as well?
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post #24 of 35
Quote:
Originally Posted by blupupher View Post
Because in reality it would look like this:
I approve of this professionally-drawn graph.
post #25 of 35
Quote:
Originally Posted by b3machi7ke View Post
interesting...you have four top side fans pulling air in, and one front as exhaust? i'm curious to know what sort of effect that has on your PSU, did you realign it so it would be blowing out the front as well?
The PSU doesn't seem to have an issue with air circulation in real world observations... It seems to be pulling air from the opening that is near it and exhausting just fine. The PSU stays relatively cool, the thermometer I had on the exhaust rarely broke 40C under load....

PSU blows out the back like any standard PSU, mounted on the bottom of the case. I can post a video of my rig in action if you guys are interested...
 
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post #26 of 35
Ever try turning that top exhaust into an intake and have it basically blow ambient air right into your CPU heat sink? Though then of course have the back fan being an exhaust.

Doh...TitaniumClocker already posted it

but basically the whole "heat rises" bit doesn't really matter when you have fans blowing air the way you want it...it might if we were talking about really extreme temps, but stuff under 100° C won't really matter.
Edited by Vagrant Storm - 10/26/11 at 9:23am
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post #27 of 35
Quote:
Originally Posted by Vagrant Storm View Post
Ever try turning that top exhaust into an intake and have it basically blow ambient air right into your CPU heat sink? Though then of course have the back fan being an exhaust.

Doh...TitaniumClocker already posted it

but basically the whole "heat rises" bit doesn't really matter when you have fans blowing air the way you want it...it might if we were talking about really extreme temps, but stuff under 100° C won't really matter.
Thank you for recognizing this fact.

Heat/hot air will rise very slowly. Most "heat" that rises is convection heat, the hot air actually moving up is very slow and gradually builds up over time. With 3 meters, taller than most PC Cases, heat wouldn't even generate enough upward thrust to lift a piece of paper. One fan can cause a stack of papers to be blown off a desk.
 
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post #28 of 35
Quote:
Originally Posted by TitaniumClocker View Post
Its this reason why I sat with a couple engineering majors and spent a few hours simulating air travel with my case.

I have 5 fans in total. The top 4 are intake, and I have the front as an exhaust. Dead silent, 50C max load on everything.
Man that post really got me thinking. My 140mm literally sits like 1/4 of an inch above my Mega and like 2 inches from my rear Scythe S-Flex F exhaust. If I flip them around..? But you have more fans than I do.

Could make an interesting experiment. Which I am no doubt to lazy to try right now. Maybe when my gpu gets here in a couple of days.
 
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post #29 of 35
Quote:
Originally Posted by TitaniumClocker View Post
Thank you for recognizing this fact.

Heat/hot air will rise very slowly. Most "heat" that rises is convection heat, the hot air actually moving up is very slow and gradually builds up over time. With 3 meters, taller than most PC Cases, heat wouldn't even generate enough upward thrust to lift a piece of paper. One fan can cause a stack of papers to be blown off a desk.
+1

Common sense isn't coupled with science often enough!

hehehahhqr *cough*
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post #30 of 35
Thread Starter 
Quote:
Originally Posted by crashdummy35 View Post
Man that post really got me thinking. My 140mm literally sits like 1/4 of an inch above my Mega and like 2 inches from my rear Scythe S-Flex F exhaust. If I flip them around..? But you have more fans than I do.

Could make an interesting experiment. Which I am no doubt to lazy to try right now. Maybe when my gpu gets here in a couple of days.
ha I love the attached picture!

If I turned the front 140mm fan round too so that is an exhaust..what then? My GPU is not rear exhausting....
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