Positive vs negative pressure in perfect conditions

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filflops

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Jan 14, 2014
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Lots of people opt for positive pressure for cooling their PCs because of the dust that comes with negative pressure.

Say I taped pantyhose to every grill, fan occupied or not. I think it's fair to say that we can now compare apples to apples. If logic serves correctly, negative pressure would be optimal, would it not?

Negative pressure expels all hot heat, and the passive air being pulled in is filtered, no matter where it comes in

Positive pressure leaves hot pockets in the system, and the advantage of dust reduced is no longer present
 
Solution
makkem
Hi
According to thermodynamics the rate of heat exchange (cooling effect in this instance) is proportional to the difference in temperatures.
So you need to be replacing the hot air with cool air as quickly as possible.
As you can see its all about how much air you can move through the case.

The air pressure does not really come into it whether it is positive or negative as with high air volumes and enough fans (front,rear,top and also even side and bottom) then you will not have dead areas.

The problem with negative pressure even with intake fan filters is that dust will be pulled through all the non airtight gaps and holes in the case but if you are prepared to blow the dust out occasionally then it's fine.
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Newbbuilder11

Newbbuilder11

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Feb 6, 2014
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Are you saying you are making pantyhose into fan filters? I guess,, that would keep the dust out o3o... waste of pantyhose though...(hugs pantyhose collection)
 
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filflops

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Jan 14, 2014
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That's exactly what I'm saying. It's been discussed that pantyhose act like a dust filtered would, and had been used many times to mimic the results of a fan filter. I steal my mom's so there's no worry about cost or waste... Selfish me lol
 
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mouse24

mouse24

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Nov 30, 2010
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That is really creepy...
 
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Newbbuilder11

Newbbuilder11

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o3o, hope you don't get in trouble lol.. I guess go for it?...
 
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filflops

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How would gpu's Suck in the dissipated heat? My sli 760s are non referenced, so the cards expel heat in the case. If they did Suck in heat with negative pressure, I don't see why they wouldn't with positive pressure.

If it changes anything, ill be upgrading cards and will water cool both.

Also, if more airflow means more cooling, then would it be better to create a directed air flow, like a wind tunnel, I. E. #Exhaust=# intake? This avoids stagnant air from positive pressure and weak cooling from negative pressure(in my mind).

Remember guys, this difference is so minimal, but I'm looking for people that have the same knack for optimization like i do. I'm not asking for permission to do this, I'm asking for constructive feedback and thoughts.
 
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plaintuts

plaintuts

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The psu and air cooled cpu generate heat inside the case, also the Gpu heatsink cant dump all its accumulated heat thru vent at the back of the case..

Warm air rises because it tends to be lighter but without adequate cool air from outside, it generally tends to hover in the middle of the case.
 
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makkem

makkem

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Jan 22, 2012
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Hi
According to thermodynamics the rate of heat exchange (cooling effect in this instance) is proportional to the difference in temperatures.
So you need to be replacing the hot air with cool air as quickly as possible.
As you can see its all about how much air you can move through the case.

The air pressure does not really come into it whether it is positive or negative as with high air volumes and enough fans (front,rear,top and also even side and bottom) then you will not have dead areas.

The problem with negative pressure even with intake fan filters is that dust will be pulled through all the non airtight gaps and holes in the case but if you are prepared to blow the dust out occasionally then it's fine.
 
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