Paul,
          This is kinda off subject due to it being on a chicken barn. So,
          you may want to contact me privately and tell me to
          take my fan and ......
          Either way, thanks.
          Dave D

   Paul,
   I am a bit confused. But here is the question(s) I have that really does
   relate to rotary exhaust, just without the heat and velocity.
   These large fans exhaust air out of the barns horizontally and the air
   currents / wind at that time carry the air and particulates across the
   ground (to aggrevate me).
   I am trying to give the company some info / facts that ducting that
   exhaust UP and away would allow neighbors and me to breath better.
   And possibly a baffle to restrict the particulates or at least some of
   them from going into the air.
   The fans presently are belled on the outside.  Which the company says
   allows the air to loose energy and more easily escape the confines of
   the duct.  (Hmm, really?)
   All this is much the same with the rotary exh, most often due to
   necessity, bend 90 degrees into an expanding volume and baffle /
   diverter plates to further reduce energy.
   Seems very similar.  Where do I get some info?
   If I don't get them to do something with the smell, you guys will not
   want to fly to the farm airstrip for a visit.  :(
   But, if I do get them to duct the air UP, it is recommended to hold your
   breath while in the pattern.
   Thanks,    Dave D


   Ducting the air up 90 degrees will help just a little bit as far as
   the stink
   of just the air is concerned. What will really help is the
   particulate content of the
   air, if any, will be removed. It will accumulate inside the 90 bend
   due to centrifugal force
   throwing  the particulate outwards towards the outside wall. This
   will have
   to be cleaned from time to time depending how much particulate is in
   the air.
   That alone should reduce the stink from just the particulate itself.
   As it is now that stuff is falling to the ground and accumulating
   and of course
   stinking in the process.

   Paul Lamar ...No rotor no motor.


If the chicken barn is dumping particulate on you, it should be possible
to force them to filter the exhaust - almost like they are littering on
you.  Should be able to determine this with some simple tests.

However, I suspect that the stink is more likely coming from aromatic
gases - hydrogen sulfide, ammonia, and methane - not mechanically
filterable.  It should be possible to electrochemically react-out these
gases.  Expensive, but possible.

A better solution in my opinion is to talk the owners into investing in
a recycling plant which would recover these gases and produce a little
power at the same time.  Or make the plant self-cooling/heating.  Birds
don't like to be too hot.

http://www.siouxcityjournal.com/articles/2007/07/11/news/local/4f529b4b4093392486257314008359ca.txt

It seems unlikely that ducting the gas upwards would have any consistent
benefit - depends too much on atmospheric conditions.  At least not with
any practical length (height) duct.

The bell mouths on the ducts probably do indeed increase the volume of
air moved per watt of electricity consumed.  A duct mouth that has the
same diameter as the duct body (fan diameter) will cause a larger
pressure rise at the duct mouth than one with a bell mouth..


Matt-


The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Youtube key word UTUBPLEASE
Copyright 1998-2008 All world wide rights reserved.