3xPc fan = 33-37 degrees ????

[S-V-K]

On picture number 2 fans are in inline position-new position is one on top of other-top one fan is blowing stright on tubes.Tubes are not hot at all,i can nearly touch them.
For intake i have 2x 120mm pc fans with unknown airflow but they are 27A.
For exhaust 1x 120mm 3000rpm 133cfm fan.Exhaust fan has 2 cm wall of activated carbon in carbon mat on it.Isn't this home made carbon filter preventing any outflow ???
After removing filter i'm getting temps 26-30 degrees celsius.
Guys, what am i doing wrong ??? Why are temps so high ???
Thank you very much

 

[FidelCashflow]

switch one or both of the intake fans to exhaust and just use bigger passive intakes. with three fans you've got the ability to drastically increase the amount of air circulating through your cab at any given time, but right now you're not capitalizing on it. if you're getting around 80*f with just one exhaust, another two will bring you down to where you want to be, even with odor control

 

[Aerohead]

I would move the rear exhaust fan right up next to the sockets if possible. You mentioned you unstacked those intakes? Also, others here have tried those carbon mats and they restrict lots of airflow but don't work on the odor so well. You might have to go with a DIY cage type filter to gain a little flow. So the 120mm's in front are .27a stock ones that come with the case, what is the amp rating on the rear fan. You might have to get a stronger exhaust fan if you want to use carbon.

 

[CloudNine]

I was tinkering with my pc case today, and I realized it's not the amount of exhaust fans you have. Because obviously there isn't much air inside of it to exhaust.

More importantly is to keep the air inside of the pc moving.

My fan setup is like this:
______________
|0................ 0|
|....................|
|....................|
|....................|
|...................0|
|_____________|

0=fan

The fan on the bottom is pointed toward the fan on the top left. The fan on the top left is blowing across 4 26w cfls, and the fan on the top right is exhausting hot air through a small homemade carbon filter.

All 3 fans are used 80mm.



I have one exhaust. 70º ambient temps, and my cab is at 74º after 18 hours of lights on.

 

[Kuroth]

Just wondering what your room Temp is... It is hot as hell right now where I am and my Room Temp is around 79 to 82 and my lights on temp is 3 to 5 degrees hotter.. Which I dont thank is too dang bad... So during Fall and Winter, my Room Temp is in the upper 60's so my case will be just right...

 

[S-V-K]

Thank u very much for speede responses.2x 120mm fans suplied with case are for intake and are placed at the top of the front panel.one is blowing stright onto the tubes.for outake i'm using 1x120mm 3000rpm 133cfm fan.I can't place one fan at the front to the bottom of the panel because there will be tank with water.rear outtake fan can be moved up BUT it will destroy the image of staelth case,if u know wat i mean.I have allready tryed to take out both intake fans and use only passive intake,tamps was nerly 40 celsius.Should i get stronger intake fans???

 

[S-V-K]

Just wondering what your room Temp is... It is hot as hell right now where I am and my Room Temp is around 79 to 82 and my lights on temp is 3 to 5 degrees hotter.. Which I dont thank is too dang bad... So during Fall and Winter, my Room Temp is in the upper 60's so my case will be just right...

Hehe temps over here are not going more than 20 deg.celsius.My room temp is roughly between 19-22 degrees.

 

[Aerohead]

How many lights? 3 X 55w? Just curious because I am using the same intake fans as you but my exhaust is different. I don't think stronger intake fans will solve the problem as well as making the passive intake larger and upgrading the exhaust fan. I know it's rated @ 133cfm but in reality it's probably pushing less than 40cfm through that filter. The original fan that came in the bottom front of the case, I removed the fan and removed all of the metal from end to end and cut it 3" higher too, basically doubled the size. I am also using the power supply hole in the rear bottom as a passive intake with low density black foam to stop light leaks and dust.

 

[S-V-K]

How many lights? 3 X 55w? Just curious because I am using the same intake fans as you but my exhaust is different. I don't think stronger intake fans will solve the problem as well as making the passive intake larger and upgrading the exhaust fan. I know it's rated @ 133cfm but in reality it's probably pushing less than 40cfm through that filter. The original fan that came in the bottom front of the case, I removed the fan and removed all of the metal from end to end and cut it 3" higher too, basically doubled the size. I am also using the power supply hole in the rear bottom as a passive intake with low density black foam to stop light leaks and dust.

Thanks for stoping in Aero.Yes 3x55W pll tubes.Basicaly this is just copy of your project.same case-same fans.i was trying to avoid cutting rear panel because of stealth look.carbon filter is gone and temps are still between 26-30 degrees.see that tubes,they are not hot and i can keep my hand below them with easy.i haves sealed that rear bottom psu hole-will try to open it when i come home.what temps did u have in your case ???

 

[geekusa]

Aero: Where did you find the low density black foam?

I'm curious what does passive intake mean?

 

[cork144]

2 inlets and 1 exhaust means youve got prosative pressure, no wonder its getting hot in there!

youll need 120mm pc fans, with alot of cfm, ive seen some rated at 110cfm, 2 of those stacked would pull through a filter with ease, if you wish to still use inlet fans, find 2 that have a low cfm, which adds to under the cfm of your exhaust.

(baring inmind you will lose some airflow through the scrubber)

 

[geekusa]

cork:

What's your opinion of these 120MM's? They are freakishly quiet, and 43CFM seems pretty good.

http://www.silentpcreview.com/article695-page5.html#sflex

I was looking at the ones at the top: the: Kama Flow SA1225FDB12L (1,000 RPM)

 

[cork144]

May 5, 2008
The updated airflow results here are the result of improvements in our testing procedures. They are more accurate than the original results above, but they are not directly comparable. Please compare these only with fan reviews published after May 5, 2008 — or ones that have updated results published in a box like this one.
12V

22 dBA@1m

1040 RPM

29 CFM

0.61W

theyre 29cfm

ive found games consoles to be louder than my 80cfm 120mm fan, its run directly from a pc powersupply unit.

 

[Aerohead]

Aero: Where did you find the low density black foam?

I'm curious what does passive intake mean?

I get the low density black foam from my local fish store. It is commonly used as a pre-filter for reef sumps. comes in different size and thickness sheets. The stuff I use is 1cm thick.

Passive intake is any air exchange hole in the case without a fan mounted in it. Passive means it does nothing on it's own but a fan in another location can draw air through it.

2 inlets and 1 exhaust means youve got prosative pressure, no wonder its getting hot in there!

Cork144 is correct here if all three fans are equal, or if the 2 intakes combined are more powerful than the exhaust fan. In my case (no pun intended) my exhaust fan greatly overdrives the 2 intakes so I have neg pressure as result. Before the passive intakes, my exhaust fan would spin the intakes that were unplugged, I added passive intakes until the intake fans stopped spinning. I only have intakes to blow on the canopy while saving space, If I had my way I wouldn't have intake fans. I mounted them between the front cover and the inner wall so they didn't take up any room in the case. This decision made them intake fans because they are outside the main chamber in the case blowing air across the canopy. Also, stacking fans is very inefficient and doesn't work well, however, I haven't tried stacking to pull through a filter so maybe it helps there. Your intakes are not trying to pull through a filter so don't stack them it will pull less cfm stacked in free air I am sure of that. If you have to run a scrubber you will likely need a centrifugal fan that sounds like a 747 lifting off.

I also think the location of your exhaust fan is too low (I understand stealth) but in reality, if someone gets close enough to that PC case to notice the rear fan location, it's cover will be blown by other than that fan anyway. I mounted all of my ballasts and gizmos on the rear of the case because people will only see it if they climb under the desk and look, that's not going to happen on my watch. IMO don't worry about the rear of the case, concentrate on the front, sides, and it's location in the room it's in.

Take a closer look at where I mounted my intakes, on the other side of the inner wall than yours, there's plenty of room between the front door and the inner wall of the case:




Here is a pic of the rear with stealth blown all to hell:

 

[S-V-K]

2 inlets and 1 exhaust means youve got prosative pressure, no wonder its getting hot in there!

youll need 120mm pc fans, with alot of cfm, ive seen some rated at 110cfm, 2 of those stacked would pull through a filter with ease, if you wish to still use inlet fans, find 2 that have a low cfm, which adds to under the cfm of your exhaust.

(baring inmind you will lose some airflow through the scrubber)

Inlet fans are only 2x27A and outlet fan is 60A.I'm guessing they are realy weak in comparison to outlet fan.i have tryed all sort of options.only passive intake,only one fan at a time,two fans tied together,two fans separately ect.

-------------------
l..........................] fan inlet
[fan exh...........] fan inlet
l........tank.........l
l........tank ........l
-------------------

 

[S-V-K]

I have moved rear exhaust fan up.but bloody temps are stil between 25.5C-28.5C ...
Should i put one more fan for exhaust ???

 

[vany]

Hi S-V-K. I too had problems with very high temperatures in my micro grow box with 138 Watts CFLs.

So the only way too solve this annoying hot thing is to read some very good threads like this one here. There are many other good thread also, explaining pc fans.

I hope you will lower temperature soon. I lowered it from 37 deg.C to 26 deg.C, mayor decrease of temperature was made by attaching glass under lights.

Have fun.

 

[cork144]

why not turn the 2 exhuasts round and the current exhaust around? 2 exhaust fans 1 inlet fan.

 

[S-V-K]

why not turn the 2 exhuasts round and the current exhaust around? 2 exhaust fans 1 inlet fan.

Oooh man i feel so stupid that i didn't try this option.i was depending on that 3000rpm fan as a only option for exhaust.plus i have cuted half of the rear panel away only to get exhaust fan higher-it didn't help at all.will defenetly try when get back home.do u mean thatne weak fan for intake and one strong with another weak will help??? I'm not that familiar with aerodynamics :-( thank you for tip mate

 

[Aerohead]

S-V-K, I saw you posted the amp draw of your exhaust fan (.60)amps, This is about half of what you will need to cool 3 X 55 PL-L. You need an exhaust fan that is at least 1.20 amps, your choice, 2 X .60 exhaust fans (quieter) or 1 X 1.20 or higher exhaust fan (louder). Your intakes 2 X .27 = .54 amps, barely less than your .60 exhaust. You need to double the exhaust to intake ratio to get the cooling going as well as lots of passive vents.