Cooling Server Closet – No A/C Is Possible

Well, let’s work this out;

  • 2 x 24 port switches (say Cisco 3750-E’s) can output 344 BTU/hr each so that’s 688 in total
  • 1 x router (say a Cisco 2921) can output 1260 BTU/hr
  • 1 x VDSL modem (say a Draytek Vigor 2750) can output 120 BTU/hr
  • 1 x Desktop (say a Dell Optiplex 790, with monitor switched off) can output 850 BTU/hr
  • 1 x 4-Bay NAS (say a Netgear ReadyNAS Ultra 4 with 4 x 2TB disks) can output ~600 BTU/hr
  • 1 x HP Microserver can output 511 BTU/hr
  • 1 x UPS (say an APC Smart-UPS 2200VA that can handle the ~1.2Kw you may be drawing) can output 275 BTU/hr

That’s 4300 BTU/hr.

You’ve got 5.2 cubic metres of space (minus the items inside it), so not including natural heat loss you’re going to have to install a minimum 29cm fan with a 900 cubic metre per hour rating with 29cm conduit all the way to the room if you don’t want to hit 42 degrees C (the lowest recommended highest temp of the kit listed above) from a nominal of 20C in 17 minutes.

Basically get an external A/C unit that can scrub 5k BTU/hr ok – a fan’s going to literally and figuratively suck 🙂

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