[Stoves] Cooking With Corn Cobs in Saipina, Bolivia

[Dean Still]

Dear Jim,

Our continuing experience has shown that a constant cross sectional
combustion chamber that is 3 times higher than the height of the fuel
entrance is clean burning but, the added draft can pull in cold air that
decreases the temperature of hot gases delivered to the pot. If a skirt is
used, i.e., if there is very good heat transfer to the pot, the combination
is effective. When a skirt is not used and heat transfer is not as good,
(hot gases contact only the bottom of the pot in a correctly sized channel
not the sides as well), then a shorter combustion chamber in this
combination can be more effective. It is always preferable to combine
optimal combustion and heat transfer efficiencies. However, as we all know,
the cook determines effectiveness and things like combustion chamber height
have to respond to her requirements.

Each combustion chamber/pot combination has to be tested and adjusted. Even
our standard 12mm channel gap often is changed to fit pot diameter or
firepower. Baldwin's book, "biomass Stoves..." on the STOVE site has great
charts that explain all this or it's summarized in "Design Principles".

Best,

Dean

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of
jameshensel at comcast.net
Sent: Monday, June 04, 2007 12:27 PM
To: stoves at listserv.repp.org
Subject: [Stoves] Cooking With Corn Cobs in Saipina, Bolivia

Robert,  I was curious about the height of the combustion chamber.  It
appears much shorter in height than other rocket stoves including the Onil
Stove and the six brick stove.  

I would be interested in whether you are seeing complete combustion in such
a short chamber.

Maybe Dean or Don could chim in with thoughts about the height of the
combustion chamber as well.  I did not see anything on the aprovecho site
discussing this point.

Jim
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