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Positive Pressure Setup - Page 3

post #21 of 29
I guess I'm missing something because I don't see any difference between "positive pressure" and "positive airflow". Positive airflow requires positive pressure... and the only pressure we are dealing with is what is created by resistance of case intake grill, filter, HDD cage, cables, etc. and exhaust vent grill. That's not much "positive pressure". So the area behind the intake fans would be higher barometric pressure reading then the reading at exhaust vents.. which would be slightly higher than room.

I understand normal airflow as being the use of intake and exhaust fans moving equal amounts of air... barometric pressure inside of case is same as room, but still the area directly behind intake and exhaust fans would be slightly higher barometric pressure reading.

Isn't airflow simply air with higher pressure moving t fill area of lower pressure? So if there is no pressure differential in the air there is no airflow?
post #22 of 29
positive airflow = little to no resistance to airflow
positive pressure = strategically placed airflow resistance to direct exhaust to desired location since air will flow to location of least resistance.

the difference in pressure is VERY small. however it doesn't take much pressure to redirect airflow to where you want it to go.

the primary difference is that "some" of the airflow in a positive flow schema would essentially be blow-by airflow. little to no heat is removed by that airflow. whereas a positive pressure, the airflow will be directed over the heat source so little to no airflow is wasted since air is forced to move over the heat source.

both schema works. and the difference is pretty much hair splitting small and almost immeasurable.
post #23 of 29
Indeed. biggrin.gif

Reminds me of "Which came first, the chicken or the egg?" thumb.gif
post #24 of 29

Actually, a positive pressure case is like a bagpipe. A bagpipe inflates because of the restricted outflow. When it is full, the pressure inside is higher than that outside.

 

A positive pressure case is like that. And hotspots develop.

 

What I am calling positive flow you can call whatever you like. How about free flow? Or airstream? Don't care what you call it, but the point is to remove all restrictions.

 

I modded my case to do that (forgive me doyll; I know you've seen this pic before):

 

900x900px-LL-90e5eb1f_Myrig2011-12-03003.png

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post #25 of 29
Nothing to forgive ehume. Your case is very nicely done. thumb.gif

That's a good explanation.

Positive pressure = restricted airflow (normal case)
Positive airflow = low restriction airflow (ehume design)
Free-flow = no restriction airflow (test bench design)
post #26 of 29
I got like 5 fans pushing air in and 3 out.

3 on rad, 200mm on the side panel, 1 on front pushing in.
2 on top, 1 on back pushing out.

PSU pulls the air from outside the case and pushes it outside the case.
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post #27 of 29
Quote:
Originally Posted by Stige View Post

I got like 5 fans pushing air in and 3 out.

3 on rad, 200mm on the side panel, 1 on front pushing in.
2 on top, 1 on back pushing out.

PSU pulls the air from outside the case and pushes it outside the case.
Another 3 fan case preheating system. biggrin.gif
post #28 of 29
Quote:
Originally Posted by doyll View Post

Another 3 fan case preheating system. biggrin.gif

Yup temps are totaly out of control and all over the place! thumb.gif
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post #29 of 29

+ rep, doyll. Hilarious.

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Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
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MonitorKeyboardPowerCase
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