Lounge Rack

I want a very quiet case. This means fans at low speed, for the most part. So, I know that airflow is going to be important. If it’s not coming in/out the right way, this could lead to a lot of heat build-up inside the case. Especially since the soundproofing material is probably not a very good thermal conductor (although I was unable to find any conclusive evidence either way).

One of the main things I’ve realised is that the power supply fan will be crucial to case airflow.

Looking at the design of the case, it has a vent in the floor for PSUs with a 120mm fan to suck air from underneath the case, which will cool the PSU before being blown out the back. Now, this set-up is fairly self contained and doesn’t help the rest of the airflow.

So I decided I need to use a PSU which sucks air from inside the case, and expels it out the back. This needs to be the primary output fan, simply because there isn’t much space in the case for any other fans in any useful position.

The case has two large vents in the roof, to serve the CPU fan, and it has four vents in the side. However, there are only screw holes to mount one 80mm fan by the front left vent. I’ll be replacing the supplied fan, as it’s pretty noisy.

So, cool air in the front left, and warm air out the rear back via the PSU. I don’t see a need for the rear left vent, so I’ll cover it up to reduce noise output. Same goes for the rear right, as the PSU will be in the way anyway (really, I don’t see the point having a vent there.

Although there’s no fan in front of it, I decided not to cover up the front right vent, because there will be hard drives near it, which will benefit from some cool air being drawn through by the PSU.
As for the top vents, I decided that I only needed one, and I covered the other to reduce noise output. I also chose to cover the one nearest the CPU fan. This sounds odd, but let me expiain: One of the main sources of noise is going to be the ‘whoosh’ of air turbulence through the holes in the vents. Roof vent 2 (see diagram) overlaps the fan on the CPU heatsink, and I think that the proximity, while offering good cooling, will lead to more noise. So, I’ve left ‘roof vent 1′ open, because I believe that the CPU fan will still be able to draw air through, and it removes the direct line of sight/sound to the CPU fan.

My airflow design for the Moneual 301

Here’s my little diagram. It shows the ‘naked’ case with the key heat producing components shown. The yellow blocks are the fans. Most of the arrows are the result of direct fan blowing, but the little ones are what I think will happen in that corner.

I’ve tried to think of most things but any tweaks or comments would be welcome.

Cooling, Hardware