[Beowulf] ammonite

Jim Lux James.P.Lux at jpl.nasa.gov
Mon Oct 4 19:11:30 EDT 2004


At 03:19 PM 10/4/2004 -0700, Jack Wathey wrote:
>http://jessen.ch/ammonite/


Very nice.. particularly the efforts you put into the cooling air. The 
comment about flow against a pressure drop is very sound.

I realize it's a time thing, but had you considered removing the fans from 
the power supplies?

What's a rough order of magnitude cost on the blower/VFD?  Does this VFD 
have a "servo" input that could be used to automatically change blower 
speed in response to temperature?  (some VFDs have an analog input that can 
be used to set up a speed = linear function of input voltage, and by 
cleverly setting the gain and offset, you can do quite nicely)




James Lux, P.E.
Spacecraft Radio Frequency Subsystems
Flight Telecommunications Systems
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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