Ventilation of a tower

[CNCBCN]

well, as I mentioned yesterday, Bm4n has a new branch on the topic of proper ventilation for a PC tower.
as an example, I'll use my tower (I won't comment on Bm4n's, as I don't even know what it looks like :D:D)
this is a standard NZXT ALPHA Black modding case NZXT ALPHA Black Modding Case ALPHA BLACK PC Cases prices sale buy - Online computer store ::: Individuals - Wholesalers - Distributors ::: Agrupa.es
this is my ALPHA ImageShack - Online Photo and Video Hosting fans"]404 Not Found 2 Ventus Fluxus Pro fans of 50 cfm, 1 Xilence 120 of 68 cfm, 2 Revoltec of 49.21 cfm, and 1 Noctua of 54.3 cfm. As of today, they are arranged as follows: one Tacens drawing in air, placed in the 5/4 bays, cooling the three hard drives; one Xilence mounted on the floor of the tower, drawing in air (facing the GTX280); one Tacens drawing out air from the back of the tower; the Noctua replacing the stock fan of the Triton 88 (which I cleverly burned); and the two Revoltec drawing in and out air from the Triton. I'm missing one fan drawing in air at the bottom front, but since it's covered by the plastic front, it doesn't do much :nono:
total 118 cfm of intake (this is wrong, because what I should have put is the cubic meters they intake per hour) and 50 cfm of exhaust (I don't count the FA fan because it's off all day :nono: it takes residual heat); and in the heatsink, I'll only count the one that moves the most air, 54.3. Simplifying a lot, 118 -54.3 =63.7 that are left for the graphics card, the MB, and other gadgets. This gives me a CPU temperature of 36 degrees and an MB temperature of 32 with an ambient temperature of 23.5. My tower is poorly set up because I'm drawing in more air than I can exhaust, but it would be worse if I were exhausting more than I can draw in
then I'll edit and add some recent photos ImageShack - Online Photo and Video Hosting ImageShack - Online Photo and Video Hosting ImageShack - Online Photo and Video Hosting

Noctua NF-P12 92.3 cubic meters per hour. The others... provide quite a lot of data :nono:

[DefSoul]

I think the key is in your last sentence, of course what is clear is not to take out more than what goes in, and for me it is not, it is to take out the same as what goes in, what I think is ideal is to create to begin with an upward flow, from bottom to top, and evacuate from above 50% of what has been put in…
what I propose is rather this:http://imageshack.us/photo/my-images/525/68351678.jpg/

[CNCBCN]

the graph is very explicit but what F.A do you have? because mine only blows air when it reaches a certain temperature, and all the more or less modern F:As work the same way, so you better forget about the F.A fan

[Bm4n]

The two most important things to ventilate a case are to create an airflow and extract hot air.

Normally a fan is placed in the front to bring cold air to the disks and the CPU cooler, and then you have to extract the hot air with extraction fans in the back, top or even on the side.

It is not necessary to calculate the air volumes, what works best according to my experience is to always have more air extraction. If the opposite happens and there is a lot of air coming in, what usually happens is that the hot air expands faster through the case and accumulates, if there is more extraction and well placed the hot air will come out faster and will promote a negative pressure and that the cold air enters through the grilles that the cases always have.

[Obione]

Fluid dynamics is not a simple thing, and it's even less simple for a manufacturer to provide real performance data, hehe.

Def the negative or positive pressure (colloquially called, positive pushes more in, negative pushes more out) can help. For example, the LanCool PC-K62 has 3 fans pushing out with low restriction and one pushing in with a lot of restriction but it works well with negative pressure (flow from front to back-top), and it works even better with the high positive pressure of the Raven or Fortress with a flow from bottom to top.

CNBCN the heatsink fan won't have much impact pushing air out of the case, I think you shouldn't count it and I'll tell you more, I don't see the point of getting out the calculator to put fake data into an equation that we don't fully understand.

What I would do in your case is use a dremel on the top of the power supply to draw air from outside, put the grill you have in the window, seal the window (you can use something cool if you want) and remove the front panel.

Editing: I would also advise you to get decent fans, there's a world of difference from a Gentle Typhoon to a Revoltec and in the end, what you pay more for also lasts longer.

[CNCBCN]

so you're lying down :D:D according to that (which I see very well) only one problem comes to mind, that manufacturers usually mount more intake fans than exhaust fans, example (my favorite) http://www.tienda-traxtore.com/tienda/index.php?page=pp_producto.php&md=0&ref=CHA643 from my humble point of view the ideal thing would be that the following elements (CPU cooler, GPU cooler, power supply) take in air directly from outside and expel it directly outside with that I say that we would achieve that we would only have to "ventilate" the PB and the hard drives ¿a couple of fans?

[Obione]

That's not so easy to do, I've seen it in configurations where there were 2 or 3 top ones and a Hydro behind, by air I see it as complicated. I wouldn't bother with that, if you have a heatsink near the rear and the flow facing there I think it's already good. If you have a reference design graphics card and that doesn't leave as much heat in the case as other designs better for GPU and even quieter, but that leave more hot air in the case. I don't think you need a lot of airflow in the case, although you don't have a big case in this sense, the important thing is (cooling and heat evacuation of CPU and GPU).

[Bm4n]

@Obione:

and the Raven's or Fortress's high positive pressure still works better with a flow from bottom to top.

I'm sure this box would work better with negative pressure, if it works its ventilation is due to its orientation and that it has very open grilles at the top.
@Obione:

I don't see the point of taking out the calculator to put false data into an equation that we don't fully understand.

:lol:

[Obione]

I'm going to tell you something curious that I found out recently about my setup. The TriCool 14 in Low is not noisy and that's why I left it. It runs at 700RPM and had much more flow than the GT when it was running slow. The thing is that the other day I started thinking about it and I checked that not only was the rear not pulling anything but air was entering towards the TriCool and the GT was stopping it when it was turning. I had to raise it to 850RPM because I have the heat sink flow facing backwards and it seemed more convenient than to function passively looking for silence at rest (turning off the heat sink and rear, the CPU temp is good) since I would have a few more degrees in the case if I don't put the front ones running that are more noticeable in terms of noise compared to their rear and upper companions.

I don't know if I should get a 14 SilentWings USC or a molex to 3-pin adapter and connect the upper one with a regulated duplicator like the rear one or directly look for a quieter case, when I got the 300 it was one of the queens of price-performance but now there are more interesting things that don't go out of price and I value silence more than before. When you're changing quieter hard more quietly you realize the noise that other components make.

Editing: By the way CNBCN the TriCool 12 are the worst and your sweetie has a few of them :chuckles:

[CNCBCN]

more awesome :D:D:D my fans are a mess, especially the revoltec :cry: :cry: not pretty either, and less effective but …. they have their years already. one of these days (since the economy isn't for many H****) I'll think about buying a couple of these SCYTHE ULTRA KAZE FAN 3000rpm 120x120x38 the idea would be to put them blowing air in and by default another one blowing it out (total of 3) maybe I'll fall into temptation and put some more in the triton 88 but it's difficult because the wires are for 25mm fans. about the dremel I accept donations :D:D:D:D I have no problem putting a sticker on the tower that says "sponsored by SR Obione "
about my tower, my idea was to drill the top cover with a 2 mm drill bit, but I got laid off and I intended to do it with the CNC (never mind that I fried the pc control card, too bad I wouldn't give it up to burn and destroy the whole company with a few H***%&%· of $&%&%% inside :D:D) my idea was to put a 140 fan between the FA and the CD drive blowing air out, since I don't have CNC I'll have to make a hole with the drill bit, file and since I know the hole with the drill won't come out well, put one of these DEMCIFLEX MAGNETIC FILTER 140x140mm. another idea I thought of today while having a beer at the bar is to put the FA on the floor of the tower and put two fans on top instead of one (keeping the theme of the grilles, unless you lend or give me a dremel) :D:D and of course drilling another hole so the FA can get air from outside

Editing: By the way CNBCN the TriCool 12 are the worst and your sweetie has a few
my opinion is the same as the one about the heatsinks, I hope that one day the manufacturers stop shoving the fans they buy by the pound down our throats and we can choose which fans we want, although there will always be idiots like me who bought revoltec fans about 10 years ago :D:D it seems like yesterday, but they still work and without making noise (maybe they're not so bad? )

[DefSoul]

Summary: Negative pressure, just the opposite of what I thought xD

[XRAYBoY]

Even though I agree with what was said, I think we are mixing up the concepts of convection ventilation and forced ventilation.
In passive mode, hot air flows upwards, but with the obsession (somewhat unnecessary in my opinion) of putting 14 fans, a whirlwind forms in the case
and that's where the concepts of convection are worthless.

Having exclusive ventilation on the CPU and GPU, with air renewal is worth it. You can't fight against the ambient temperature.
My Q6600 with OC is a furnace and with one blowing in the front and another blowing out the back (+ the power supply on top), happier than a lark, hoygan.

[Sylver]

@XRAYBoY:

Even though I agree with what was said, I think we mixed up the concepts of convection ventilation and forced ventilation.
In passive mode, hot air flows upwards, but with the obsession (somewhat unnecessary in my opinion) of putting 14 fans, a whirlwind forms in the case
and that's where the concepts of convection are worthless.

Having exclusive ventilation in the CPU and GPU, with air renewal is fine. You can't fight against the ambient temperature.
My Q6600 with OC is a furnace and with one fan blowing in the front and another blowing out the back (+ the power supply at the top), it's happier than a lark, hoygan.

+1 XRAY, couldn't agree more xD

And by the way, let's remember that the more fans we put in, the more noise we accumulate, no matter how quiet they are, the greater the number of decibels is noticeable.

Regards

[CNCBCN]

I ask how the noise increase (decibels) is calculated. For example, if I mount two ventis that generate 50 dB, I don't get 100 dB, right?

[Sylver]

If you had 50 dB in fans you would feel overwhelmed which is not written

Obviously not, the increase in noise is not 50+50 = 100
although by logarithmic formula it does increase a small percentage of decibels each time you increase the emission sources.

Here you have a decibel calculator to check it
http://www.cesva.com/es/Servicios-y-utilidades/Calculadora-de-dB/t477.html

Regards

[Obione]

It is a logarithmic function, every 3dBs we double the noise. That is 25+25=28.

Silver fans make noise starting at 1000 RPM and this increases exponentially, in my opinion, performance/silence is more worth having 2 GT 1150s than 1 of 1850. Another important aspect is harmony, if you have a noisy graphics card or power supply, it doesn't make sense to buy some SilentWings USC and put them to run slow if we want silence under load :nono: If we want silence at idle and under these conditions both the power supply and GPU (here we could intervene via software) relax RPM quite a bit, then maybe yes, it also depends on what we are looking for and how we regulate the fans. The GT 1850 for the aforementioned case of silence at idle and performance under load seems like a good option when regulated.

I thought I had nailed it with my equipment but I got a little surprise in the summer, on a hot day with a demanding game the Sapphire makes a little noise :rollani: The next graphics card I get will have a decent cooler that I can OC without sacrificing silence under load.

[CoUgSt]

@Obione:

I thought I had nailed it with my rig but I got a little surprise in the summer, on a hot day with a power-hungry game the Sapphire makes a bit of noise :rollani: The next graphics card I get will have a decent cooler so I can OC without sacrificing silence under load.

Get an Accelero S1. It's as quiet as you want it to be (you can leave it passive or put the fan you like best). I've had it for several generations of cards and it's served me well for all of them, even for the ones it's not officially meant for

[CNCBCN]

@CoUgSt:

Get an Accelero S1. It's as quiet as you want (you can leave it passive or put the fan that suits you best). I have several generations of cards and it's working for all of them, even for the ones it's not officially meant for

almost at the beginning of the branch, they say it heats up the inside of the tower. I don't know how much it would affect the performance

[CoUgSt]

@CNCBCN:

almost at the beginning of the branch, they say it heats up the inside of the tower. I don't know to what extent it would affect the performance

Well, I've had it for a while. And with the OCZ Vendetta 2 the micro didn't go over 70º at 4Ghz, now at 3'4Ghz with the Archon it doesn't go over 43º, I have to try to push it more but anyway if you have the components reasonably well cooled it's one of the best solutions

[Obione]

@CoUgSt:

Get an Accelero S1. Silent as much as you want (you can leave it passive or put the fan that suits you best). I have it for several generations of cards and it's serving me for all of them, even for those that it doesn't officially support

I don't know if it will be easy to disassemble my graphics card or if it will be noticeable later, so I don't rule it out for the upcoming summer, it's cool in winter.

By the way, sometimes I look at heatsinks and I see few compatible with the 6850 (see the S1), on top of that, I don't know if mine is the reference one. Let's see if I'm going to get something that I can't anchor later :eoh: