Re: [very very OT] noisy power supply
Chuck Stickelman writes:
> Having fans inside a computer case (such as those mounted on the CPU's
> heat sink) lower the air pressure inside the case - Bernoulli's
> principle.
No. Those fans just stir the air around inside the case, transferring heat
from the cpu etc to that air.
> Turn the fan around like Joerg has suggested. This will make the case
> positively pressured and will keep air (and junk) from infiltrating those
> nooks and crannies.
Joerg's fan is mount in his power supply. Turning it around will result in
air being drawn into the power supply, heated by the components there, and
then blown into the computer. This will result in the power supply running
cooler but the computer running hotter. His fan is also
tmeperature-controlled: reversing the flow may screw that up such that the
fan doesn't run at all.
> The solution to THAT problem is to put a filter in front of the fan.
A _seperate_ fan. Leave the one in the power supply alone.
> As for noise, get the quietest fans possible - ones with ball bearings
> seem to be better than those that use brass bushings or sleeves.
That is only because those that use brass bushings or sleeves are very low
quality. Normally bushings are quieter than ball-bearings.
Taking the fan apart, removing all the grease, and replacing it with Teflon
lubricant may help. The lubricant the manufacturers use seems to quickly
turn to tar.
--
John Hasler
john@dhh.gt.org
Dancing Horse Hill
Elmwood, Wisconsin
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