[time-nuts] HP5370 power supply measurements

[William H. Fite]

The fact remains that there are some very quiet equipment fans besides the
little muffins that sound like drones lifting off.


On Friday, July 15, 2016, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> --------
> In message <
> CANy2iXq6ONvriDoFgNFkEBQjDKntP7t8KuE7BOUpxJWLCuxLsw at mail.gmail.com
> <javascript:;>>
> , "William H. Fite" writes:
> >David Kirkby scripsit:
> >>
> >> I often here of people replacing fans with quiter ones, but I suspect
> that
> >> all they really do is reduce the airflow.
> >
> >Not necessarily, Dave. The Austrian company, Noctua, for one, makes
> >extremely quiet fans with excellent airflow.
>
> ... at zero pressure differential, which is easy to do (Think: ceiling
> fan).
>
> The hard part is to make fans silently move air when they also have
> to build up pressure to get the air to move places.
>
> This is where the gap between the wings and the frame must be minimized,
> or the pressure will leak out through it.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>


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