Need help

[Nemoo88]

I need some help.

 

Look on the picture.

is this good? or shulde i change something? 

Im getting some kind of negative airflow. 

in top i have a radiator.

Shulde i change something to get it cooler or better?

 

 

want more pics. just ask and ill fix it

 

Ty for help

[W-L]

-SNIP-

 

Welcome to the Forums!

 

If your wanting to keep positive pressure I would ditch the extra 140mm in the front 5.25" bays it will be slightly more positive pressure then with the large 200mm intake.

[Jacktastic-Mofo]

You want more fans taking air in than you do exhausting. Switch that rear fan to intake and it'll help cool of the back of your GPU and directly cool your CPU's AIO. Then you'll be all set

[Nemoo88]

You want more fans taking air in than you do exhausting. Switch that rear fan to intake and it'll help cool of the back of your GPU and directly cool your CPU's AIO. Then you'll be all set

 

 

Okey hmm

 

wont the front fan and back fan push air -> <- so it will get "stuck" in center of case?

[Jacktastic-Mofo]

Okey hmm

 

wont the front fan and back fan push air -> <- so it will get "stuck" in center of case?

No, because the top fans are already pulling the front air up and out of the case. Trust me, I have a very similar setup in my PC. I have two intakes in the front, two exhaust in the top, and another intake in the rear- I even have the H100i.

[Nemoo88]

No, because the top fans are already pulling the front air up and out of the case. Trust me, I have a very similar setup in my PC. I have two intakes in the front, two exhaust in the top, and another intake in the rear- I even have the H100i.

 

Okey will change that tomorrow then. shulde i move the radiator to the 2 first fan on top? so the 140 will blow out over the mb?

[Jacktastic-Mofo]

Okey will change that tomorrow then. shulde i move the radiator to the 2 first fan on top? so the 140 will blow out over the mb?

Just put that 140mm fan in the front if you can, that'll give you much better, much more efficient airflow.

[Nemoo88]

Just put that 140mm fan in the front if you can, that'll give you much better, much more efficient airflow.

 

hmm that is going to be hard.

i have this case: http://www.phanteks.com/Enthoo-Luxe.html  and i use the lower 5.25" for my led controller. 

 

and the hdd case in bot is gone aswell.

[petem]

It looks like you have the right idea.

 

If I see things right, your PSU exhausts at the back bottom, your CPU has a (2 fan) liquid cooling radiator at the top, and your GPU exhausts out the back.

 

A few questions:

1. Does your PSU intake from the bottom or inside the case (on the PSU top).
2. What are the CFM specs for the fans at their usual speeds?
3. What do you mean by "some kind" of negative airflow? - where is the air flowing poorly?

[Nemoo88]

 

It looks like you have the right idea.

 

If I see things right, your PSU exhausts at the back bottom, your CPU has a (2 fan) liquid cooling radiator at the top, and your GPU exhausts out the back.

 

A few questions:

1. Does your PSU intake from the bottom or inside the case (on the PSU top).
2. What are the CFM specs for the fans at their usual speeds?
3. What do you mean by "some kind" of negative airflow? - where is the air flowing poorly?

 

 

I have h100i so i have 4x fans on radiator.

PSU intake is in bot.

I use 4x Corsair SP120 Quiet edition 37.85 cfm on radiator, but dont know if thats @ full speed or not?

and 1x Corsair SP 120 Quiet edition @ back.

In front i have: PH-F200SP  and it have 110.1 CFM @ 100%

And in top i have 1x Phanteks PH-F140SP 82.1 CFM @ 100% and 1x in mid bot aswell.

And the other one in bot is a random 140 fan and i dont know the CFM on it.

 

If i put a paper on the right side of the back fan where there is some small holes. the paper wants to "stick" to it. so i think i have negativ pressure.

[petem]

OK, that's what I needed to know.

 

You have too many exhaust fans, creating negative pressure in the case.  As a result, wherever there's a crack or opening, the case will be sucking air in at those spots.

 

The whole purpose of the fans is to direct airflow across items that need cooling in the most efficient manner.  In your case (pardon the pun), there is so much draw at top that air is being pulled in right next to the fans that are pulling it out!

 

To avoid pulling GPU/PSU heated air being pulled in at top back fan, you need more intake fans, or else speed up the intake fans and/or slow down the exhaust fans.

 

The easiest way to approximate relative fan performance is by assuming they all have roughly the same CFM per their fan area, and calculate from there:

 

For case fans, I count 916 (5x12x12 + 14x14) square cm. of exhaust fan area, and 792 (2x14x14 + 20x20) sq. cm. on intake.  

Plus, don't forget the GPU is pulling air from the case and exhausting it out the back, so that's probably another 100-150 sq. cm. exhaust, but at a reduced efficiency, so we'll play it safe and call it 100 sq. cm. equivalent to case fans.  

The PSU does not affect the air flow in the case much since it has a separate intake and exhaust.  

 

The radiators won't have as smooth an air flow as open fans, but since you want positive pressure, match the intake and exhaust fan area and you should be OK.  This all assumes that the fans are all producing roughly the same CFM for their fan area.  If you have have fan(s) that are significantly higher or lower CFM for their size, adjust accordingly.

 

Ok, lessee - 916 + 100 = 1116 exhaust fan area, and just the 792 for the 3 intake fans.  Assuming roughly equal CFMs to area ratio, that leaves you with a 324 sq. cm. intake deficit.  

 

A single 200 or 2 x 140s or 3 x 120s oughta do the trick - deck out the front of the case with some more fans!

 

Either that or speed up the intake fans vs. the exhaust fans (such as slowing down the back fan, since the CPU has a cooling block so it's not as important as it otherwise would be).

 

Good luck!

[Nemoo88]

I have moved some fans and moved the rad.

I think this is working. cant see any negative airflow now.

is this good or is bad?

 

[petem]

 

I have moved some fans and moved the rad.

I think this is working. cant see any negative airflow now.

is this good or is bad?

 

 

 

Much better info in that pic ...

 

New approximation maths (using the fan sizes in cm to simplify math):

 

• exhaust: (14*14 + (5*12*12))@5% = (196 +720)*.05 = 45.8
   
• intake (assuming HD fan is in a tight cage with the only inlet from the front of case):
      12*12*.05 + 2*(14*14)*.25 + 20*20 = 7.2 + 98 + 400 = 505.2

 

You've got a huge amount of head room to increase your exhaust fans.  

 

You can easily bump them up by a factor of 10, to 50%: exhaust = 458, intake = 505

Or, if that's too noisy, bump them to 25% and run the 200 @ 50%: exhaust = 229, intake = 305

 

That will get you in the ballpark, then adjust them as desired to get a moderate positive air pressure in the case.

You don't want too much, though, because that means the radiator isn't pulling it's fair share of the air ; )

[Nemoo88]

TY ALL for the help.

[petem]

You are very welcome