New Computer Thread Back in March

[Howard Gibson]

On Sun, 05 Aug 2007 13:02:42 -0400
Evan Leibovitch <evan-ieNeDk6JonTYtjvyW6yDsg at public.gmane.org> wrote:
> 
> I was told it's actually easier to make a big case quiet (the Sonata is
> standard "mid-tower" shape) than a small one, as larger fans don't need
> to turn as fast as small ones to move the same amount of air and it's
> fan RPM that affects noise more than anything (which is why 1U cases are
> so noisy).

Evan,

   This is _one_ of the reasons airliners have switched from turbo-jets to the high bypass turbo-fans.  If you move more air at a lower speed, you make less noise.

   If you look in a fan catalogue, you will see airflow and pressure curves and you will see the noise, usually ‌in decibels.  I have never tried to select a quiet fan, so I do not have a feel for this subject.  My fans have to deliver airflow no matter how much stuff we put in front of them, the space for them is limited, and they go into aircraft where everything is noisy anyway.

   If you want to replace an existing fan, you should be able to remove it from your computer, identify the part number and search for the fan on the internet.  You need to equal the airflow _and_ the back pressure (also called head), as well as the voltage.  There might be a quieter one out there.  Fan blades vary wildly in shape between fans that otherwise, would appear to be identical.

-- 
Howard Gibson 
hgibson-MwcKTmeKVNQ at public.gmane.org
howardg-PadmjKOQAFn3fQ9qLvQP4Q at public.gmane.org 
http://home.eol.ca/~hgibson
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