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Positive computer case pressure: myth? - Page 3

post #21 of 54
Quote:
Originally Posted by adamjp View Post

Let's say you have no exhaust fans but a lot of fans all pushing air across the top portion of the case and toward the top exhaust vent. Due to the dead spot in the bottom of the case, do you think air is gonna be drawn in or out of the air vent at the bottom of the case?
Yes it will be until the pressure there is equal to the pressure of air coming out of fan. Higher pressure moves to lower pressure areas until pressure equalizes. Just like poring a cup of water into a full bowl. the water surface remains flat and whatever water does not fit into bowl runs over the top. Basically the bowl it case and top of bowl is vent area.
post #22 of 54
Quote:
Originally Posted by adamjp View Post

Let's say you have no exhaust fans but a lot of fans all pushing air across the top portion of the case and toward the top exhaust vent. Due to the dead spot in the bottom of the case, do you think air is gonna be drawn in or out of the air vent at the bottom of the case?
Since the presure anywhere inside the case is the same. So, yes, the air will also exhaust out the bottom. While "wind" will have an effect, the effect of pressure is likely orders of magnitude greater.
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post #23 of 54
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Proof:

The total pressure of all intake fans minus the total pressure of all the exhaust fans equals the pressure inside the case.
That's the way you god made it work when he/she created time and space!

It is true though that if those pressures are equal there would be no pressure inside the case.

As stated above, read this
 
 

LOL, let's see some manometer proof, rather than abstract calculations.

I have no doubt there's a pressure differential near the fan inlets or outlets, but let's see that reflected in a case pressure reading.

Computer cases are hardly airtight.
post #24 of 54
You are missing the point... Evidence doesn't mean much without theory to back it...

I'm not exactly sure what your contention is here - are you arguing that pressure is neutral in a chassis? Negative? That it does not exist???

Smoke and dust videos are your "proof," as well as Doyll's temperature results, but if you don't understand why...

Edit: a simple test is to load your case with intake fans at max speed. The chassis will not explode, but watch those temperatures rise
Edited by claes - 8/31/16 at 1:12pm
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post #25 of 54
Ah, ye olde "pressure" myth arises once again.

It is not pressure but flow. People have a hard time visualizing what is going on so an analogy is helpful. Air behaves like a fluid. Truly it does! To explain this in a computer case I like the babbling brook scenario.

Take your case to a babbling brook and drop it in facing forwards and then watch the water flow in the front, around the components and then out the rear. You will see that just like the water is flowing around and over rocks and sticks and such it is flowing around the components and creating swirls and eddies.

It is your sworn duty to reduce or eliminate those swirls and eddies!! medieval.gif

Of course when it is turned on and the powerful fans cooling the GPU start blowing hot air forwards and up your job becomes a bit more complicated. kungfu.gif

But seriously it is not about pressure. When you stick your hand into that babbling brook you will feel pressure, but it is not pressure but flow that you are feeling.
Edited by miklkit - 8/31/16 at 2:31pm
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post #26 of 54
Quote:
Originally Posted by claes View Post

You are missing the point... Evidence doesn't mean much without theory to back it...

I'm not exactly sure what your contention is here - are you arguing that pressure is neutral in a chassis? Negative? That it does not exist???

Smoke and dust videos are your "proof," as well as Doyll's temperature results, but if you don't understand why...

Edit: a simple test is to load your case with intake fans at max speed. The chassis will not explode, but watch those temperatures rise

This definitely happens. Set my top radiator to all intake, and temps went up a measurable amount. Only exhaust was rear, and yeah, not good, not good at all. 3c difference on my water cooled card. I would imagine it would be worse with an air cooled one. 'Course my situation is a bit different, it was dumping that slightly warmer air from the radiator into the case, but still. Set them back to exhaust and life is good! thumb.gif
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post #27 of 54
Quote:
Originally Posted by billbartuska View Post

[
Ah, the third law of thermodynamics says that can't happen. The amount of air entering and leaving the case is exactly the same. You need intake fans that have more pressure than the exhaust fans have vacuum, and the closer the amount of pressure is to the amount of vacuum, the less fan efficiency you loose.

Seems like it is simpler to reference a fluid continuity equation and incompressible flow.
post #28 of 54
Quote:
Originally Posted by miklkit View Post

It is not pressure but flow. People have a hard time visualizing what is going on so an analogy is helpful. Air behaves like a fluid. Truly it does!

Flow always moves along pressure gradients, no pressure gradient equals no flow.
Quote:
Originally Posted by miklkit View Post

But seriously it is not about pressure. when you stick your hand into that babbling brook you will feel pressure, but it is not pressure but flow that you are feeling.

You cannot separate them, you are feeling the pressure of the water above your hand (upstream) pushing the water into your hand with the water downstream pushing on the other side, but not as hard. You can also simplify this pressure gradient into a flow rate at your hand and think about it like that. They are the same thing.

Edit: Flow = pressure gradient with time included
Edited by Asmodian - 8/31/16 at 2:47pm
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post #29 of 54
Quote:
Originally Posted by miklkit View Post

But seriously it is not about pressure. When you stick your hand into that babbling brook you will feel pressure, but it is not pressure but flow that you are feeling.
What! You're feeling higher pressure on the upstream side of you hand and lower pressure on the downstream side of you hand.
If you didn't feel those then the brook would not be babbling - it would be a puddle.
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post #30 of 54
Quote:
Originally Posted by claes View Post

Edit: a simple test is to load your case with intake fans at max speed. The chassis will not explode, but watch those temperatures rise

Depends on where components are in relation to flow.

When I was running my air cooled 3930k and reference CFX 7950s I had five intake fans and no exhaust fans. This config was by far the coolest of the half dozen or more I tested because it put cool intake air directly over the CPU VRM of my motherboard and the CPU heatsink, as well as forcing a great portion of total flow through and around my GPUs. More air went through the case with a more balanced fan setup, but less air went through the components that needed the most cooling.

78d91697_DSCN0754.jpeg

Edit: Actually, there were six intakes here, the door had one as well; so six 1200rpm 140mm Cougars as intakes. I did eventually remove the lower front intake and block off that area as my HDDs were getting too cold.
Edited by Blameless - 8/31/16 at 5:18pm
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