I'm building my pi home server, with nginx(php,cgi-bin), ssh, btsync, iptables, cron, ramlog. I'm running the pi as the DMZ of my network, so I can access my pi services from anywhere with a dynamic dns update.
I've installed a small single heat sink cutted off with my dremel from an old video card bigger one.
I'm planning to make 2 more heat sinks for eth controller and current regulator. I thought it was enough.
While I was installing the software, I ended up writing a simple cgi-bin to monitor my pi-status.
At this point I realized that the temperature of the cpu of my pi inside the enclosure was 51.5°C!
I'd like to run my pi 24/7, so I think I'll need a sort of cooling system.
Without the top enclosure the pi is exposed to dust and the temp is 45°C.
I took an old cpu fan. It's a 12v x 0.12A = 1.44W fan. 50mm x 50mm
I've connected it to pin 4-6 -> 5v-ground and it' spinning enough to keep my pi to 31°C.
1.44W / 5V = 288mA is it too much to run 24/7? the current regulator is cool right now.
In case I would connect some usb devices without an external powered hub, would it be a problem?
I think I'll have to use a second cellphone psu, and conltrol the fan status with gpio.