[Beowulf] materials for air shroud?

Douglas Eadline deadline at eadline.org
Wed Aug 31 11:20:03 PDT 2011


I have experimented with some simple ducting for my Limulus
system. I found a Vinyl Flashing from Union Corrugating Company
(purchased at Lowes home center) that has some nice features, it is
bendable, holds its shape, easy to cut, and has a low carbon content
(harder to burn than most plastics), and it is fairly stiff.

My needs are "low temp" air ducting. I have not tested it
with constant warm/hot air.


> Anybody know of a nice cheap, high melting point, easy to work with
> sheet material, for making a custom air shroud?
> We have one box with stuff in it that looks similar to HDPE, the
> material the white flexible cutting boards are made of, but it is a bit
> thinner and more rigid that that.  Unfortunately there are no markings
> on it, so HDPE is just a guess.  Whatever it is, it cut easily with
> scissors (I had to trim it slightly at one point.)
> Background.  We have an older Supermicro SC-823 server with dual
> processors.  The air shroud it came with only covers the first
> processor.  That didn't matter much when it had two low power processors
> in it, but after upgrading it to dual Opteron 280s, the uncovered second
> one runs considerably hotter than the covered front one.  (Swapping the
> processors around didn't help - the heat stayed where it was, so a
> ventilation issue, not a processor issue.)  Supermicro does make a newer
> shroud which extends to the back of the case, but the manual (google for
> "SC-823 air shroud user's guide") indicates that it is designed for
> Intel CPUs.  So it may or may not fit around the Opterons.
> The redesigned air shroud will probably work, but I'm about 90%
> confident that taping a sheet of plastic onto the back of the existing
> shroud would work as well - if I can find a plastic that won't flap
> around or melt.
> Thanks,
> David Mathog
> mathog at caltech.edu
> Manager, Sequence Analysis Facility, Biology Division, Caltech
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