Quick question!

[JioFunny]

Hello,

 

Say that we have a midi tower ATX case, horizontally placed on a desk for horizontal motherboard position, with noctua nh-d15, 3 of the most powerful 140 fans up front, and 3 exhausts in the back, one for gpu a normal one and even fit a smaller one on the side..

The point is imagine massive amounts of airflow. 3000 rpm fans.

 

My question is, wouldn't a build like this obviously benefit as far as cooling goes if you have the big side lid (upper if it is in the position that I described) closed? 

Or would removing the lid still somehow be better? I have a hard time understanding how it would be better as the air would not be properly directed towards the other side of the case.. and a good amount would escape upwards before it effectively reaches the other side of the case.. am I right?

 

Thank you

 

[Lordmage]

air flow can restrict airflow if that make sense the goal is either a front to back with some bottom up flow. 

 

you want your intakes to be in balance with your exhaust. maybe a little faster intake in some use cases.  so people use internal fans to direct flow or even 3d print air flow guides so fresh air goes to the correct area. 

 

heat rises and swaps places with cooler naturally so in some use cases that's how air move around a case. 

[Moonwalker53]

If you mean the side panel, then no. It will prob make it worse, because there wouldn't be any positive pressure inside the case, and there will be more dust.

P.S And generally you want more intake fans (the ones that blow air in) than exhaust, to achieve positive pressure

[JioFunny]

25 minutes ago, Lordmage said:

air flow can restrict airflow if that make sense the goal is either a front to back with some bottom up flow. 

 

you want your intakes to be in balance with your exhaust. maybe a little faster intake in some use cases.  so people use internal fans to direct flow or even 3d print air flow guides so fresh air goes to the correct area. 

 

heat rises and swaps places with cooler naturally so in some use cases that's how air move around a case. 

Yes. I described a front to back system with all fans equally powerful. This was not an answer to my question though..

I agree with the use of internal fans in some cases. I have done it. Depends on the pc case and what kind of fans you have.

[JioFunny]

26 minutes ago, Moonwalker53 said:

If you mean the side panel, then no. It will prob make it worse, because there wouldn't be any positive pressure inside the case, and there will be more dust.

P.S And generally you want more intake fans (the ones that blow air in) than exhaust, to achieve positive pressure

Yes the side panel. I also thought it will make it worse for the reason you described. 

But. Dust is not a problem. I have an air compressor in my home (it's a very powerful air blowing machine.. car mechanis use this) and clean pc once a month. 

But anyway I was talking about that positive pressure. The reason I am making sure is because, wherever you turn your head and look.. there's people taking the side panel off and reporting better temps.

 

So my guess is this happens because they don't have very powerful fans correct? So their heated air does not leave the case through the exhaust on time and heat builds up.. correct?

 

I will add one more thing. In a build like the one I mentioned.. 3 powerful fans front and 3 back.. and horizontal placement, would it not benefit if I closed the area over the cpu? (Top side in vertical motherboard/case placement).. so as not to allow air to leak through there and increase positive pressure?

[Lordmage]

2 minutes ago, JioFunny said:

Yes the side panel. I also thought it will make it worse for the reason you described. 

But. Dust is not a problem. I have an air compressor in my home (it's a very powerful air blowing machine.. car mechanis use this) and clean pc once a month. 

But anyway I was talking about that positive pressure. The reason I am making sure is because, wherever you turn your head and look.. there's people taking the side panel off and reporting better temps.

 

So my guess is this happens because they don't have very powerful fans correct? So their heated air does not leave the case through the exhaust on time and heat builds up.. correct?

 

I will add one more thing. In a build like the one I mentioned.. 3 powerful fans front and 3 back.. and horizontal placement, would it not benefit if I closed the area over the cpu? (Top side in vertical motherboard/case placement).. so as not to allow air to leak through there and increase positive pressure?

your generally correct but in most of those side panel off case the intakes are to slow or restricted or even not getting cool air in the first place so the positive pressure is hurting there cooling. 

positive pressure is simply determined but the intake fan speed x amount of them. 

with a system having 3 in and 3 out.

If the in's are faster than out = positive pressure would exist the only way to increase the pressure is to increase the amount of intake fans or speed on those fans without changing the exhaust speed or amount fans negative pressure is the reverse of the above. 

 

if a part of the case is open to the air then there is no positive pressure relative to ambient  

[JioFunny]

11 minutes ago, Lordmage said:

your generally correct but in most of those side panel off case the intakes are to slow or restricted or even not getting cool air in the first place so the positive pressure is hurting there cooling. 

positive pressure is simply determined but the intake fan speed x amount of them. 

with a system having 3 in and 3 out.

If the in's are faster than out = positive pressure would exist the only way to increase the pressure is to increase the amount of intake fans or speed on those fans without changing the exhaust speed or amount fans negative pressure is the reverse of the above. 

 

if a part of the case is open to the air then there is no positive pressure relative to ambient  

Ok. For that specific horizontal build side panel should be closed. Now.. what about the top side (right side in my horizontal build) over the CPU? I feel like even if I would stack it with three intake fans there just to increase fresh air volume in the case, it would probably do more harm than good because last two fans are too close to the exhaust.. and.. all of them are blowing a different direction from the main intake ones.. I don't know but it feels like they would hinder the positive pressure. 

[Lordmage]

they would Jio in my experience the top of a case should be exhaust and only if you have the right air flow pattern.

heat will rise up and to much down intake would create turbulence in the case against the front intake. 

[JioFunny]

3 minutes ago, Lordmage said:

they would Jio in my experience the top of a case should be exhaust and only if you have the right air flow pattern.

heat will rise up and to much down intake would create turbulence in the case against the front intake. 

Remember. I am placing my case horizontally. Top of the case is the side panel.

[Lordmage]

1 minute ago, JioFunny said:

Remember. I am placing my case horizontally. Top of the case is the side panel.

so in my Top of case i refer to the top as in orientation. so the side panel is the top.

you may benefit from exhaust over the CPU at your top. and intake from your front.

 

PSU intake from case and exhaust out. so you have 3 intakes at max speed. PSU and Top exhaust.  GPU flow thur. so it would pull available front air and push up and out or down and out. 

[TPCEA]

On 9/9/2023 at 6:56 AM, JioFunny said:

Hello,

 

Say that we have a midi tower ATX case, horizontally placed on a desk for horizontal motherboard position, with noctua nh-d15, 3 of the most powerful 140 fans up front, and 3 exhausts in the back, one for gpu a normal one and even fit a smaller one on the side..

The point is imagine massive amounts of airflow. 3000 rpm fans.

 

My question is, wouldn't a build like this obviously benefit as far as cooling goes if you have the big side lid (upper if it is in the position that I described) closed? 

Or would removing the lid still somehow be better? I have a hard time understanding how it would be better as the air would not be properly directed towards the other side of the case.. and a good amount would escape upwards before it effectively reaches the other side of the case.. am I right?

 

Thank you

 

It depends but generally it'll be cooler without the side panel. 

 

On 9/9/2023 at 8:32 AM, JioFunny said:

So my guess is this happens because they don't have very powerful fans correct? So their heated air does not leave the case through the exhaust on time and heat builds up.. correct?

No, if the side is off, the air is less restricted and, thus, can usually achieve lower temps, depending on load and the quality of the fans. You can easily test to find out...

[thrasher_565]

with a balanced fan setup having the side on can be as good or better then just and open case. but with out a balanced setup taking the side off making it an open case gets better temps. even if the case is open it can still benefit from air across it.

 

for a closed case if the air in cant escape fast enough then fans will try and push air in but cant so most air will just bounce back out. you can over come some of it with fast fans or good static presher fans but some point the fan will be restricted.

 

best is to have slight more air coming it then out. and the way you do it is also importend. front to back or bottem to top. most do front to back with bottem in and top out.

 

back fan is needed for gpu exhaust

bottem fans if your case can have em help with gpu temps

front fans for cpu cooler and gpu to push the gpu exhaust towards the back and give it fresh air.

top fans can be good or bad depending on the setup. if one back fan for exhaust is not enough then the back top fan can also be exhaust.

if you have a tower cooler and front intake you most likey want the front top fan intake or no fan at all. as it can mess with the front fan air flow (front to back)

 

using an aio front mount would be best for cpu temps but worse for gpu temps as it will dump its hot air at it but its like 1-3c diffrance

top mount aio slighting hotter temps as it takes some of the gpu exhaust and suckes it up but will alow for gpu to get fresh air from the front. agane about 1-3c diffrance

 

vertical mout gpu can be good or bad depending on the setup. most people do it for looks and give up some temps to do so.

 

the best case would be a case that has 2 diffrant chambers one for gpu and one for the mb. there kinda some out there but i dont think there the best design yet imo.

 

an open case makes it so there no presher and can disapate all the heat in to the room faster. kinda like boiling water more water takes longer to heat up.

 

then there things that reduce the profromace of the fan like grills, dust filters, solid pannals.

 

ducting air to the part would be the best way but no one dose it.

 

 

 

[JioFunny]

On 9/10/2023 at 6:30 PM, RevGAM said:

It depends but generally it'll be cooler without the side panel. 

 

No, if the side is off, the air is less restricted and, thus, can usually achieve lower temps, depending on load and the quality of the fans. You can easily test to find out...

It really doesn't make sense that it will be cooler with an open side panel based on the setup I described.. which is with powerful fans both in and out. The point is that heat will travel out of the case on time before it starts building up inside the case. 

I guess best thing to do is test though indeed.

Thank you 

[TPCEA]

6 minutes ago, JioFunny said:

It really doesn't make sense that it will be cooler with an open side panel based on the setup I described.. which is with powerful fans both in and out. The point is that heat will travel out of the case on time before it starts building up inside the case. 

I guess best thing to do is test though indeed.

Thank you 

I understand. Consider that having high airflow can cause airflow problems that actually result in hot air being trapped in some places, as well as turbulence. Having a mesh case or the main panel open causes that to cease to be possible. 

 

Let us know the results. 

[JioFunny]

I will. Thank you all.