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<div class="moz-cite-prefix">Dear Crispin, Richard and Vincent,<br>
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503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><big><span
style="mso-ansi-language:EN" lang="EN">I should like to
make some remarks
regarding the practice in the use of a stove with a grate
fuelled
with thin sticks or appropriate pellets:<br>
<br>
The lighting is greatly simplified if one places igniting
paper in the form of
three or four rolls, crosswise to the steel bars. One can
then ignite the paper
rolls (with the kinlding on them) from the heating port,
after having already
inserted the pot. The smoke-phase is then short and heat
loss is reduced.<br>
<br>
With experience one can ensure that the insertion of the
sticks is stopped in
time, so that the sticks burn completely and the pot
contents are parboiled -
but the cooking is finished in the thermos-container
(haybox, haybasket) as
mentioned earlier. The wood consumption may be 330 g
(corresponding to 5 MJ of heat
content) for cooking 6 kg of food (requiring theoretically
about 1.9 MJ heat
supply). Thereby a little ash (about 2 g) is produced.<br>
<br>
This method reduces the stress on the cook. A consumption
of charcoal of more
than 1.3 tons per year (more than 8000 kg chopped tree
weight) by a household
is reduced to about 600 kg of thin sticks, moreover with
more comfort for all
involved and less health burden.<br>
<br>
I believe that this technology is in the sense of E. F.
Schumacher that is promoted
exemplary through Practical Action.<br>
<br>
With kind regards</span></big><span
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<![endif]-->Dieter<br>
<br>
<br>
Am 22.01.2014 23:51, schrieb Crispin Pemberton-Pigott:<br>
</div>
<blockquote cite="mid:12a601cf17c4$6d7b4de0$4871e9a0$@gmail.com"
type="cite">
<pre wrap="">Dear Richard and Vincent
Jambo.
I see just about everyone found that adding a grate to a flat-bottomed stove
improves the performance.
RS>.I would advise use of round bars as Crispin but I would suggest you
grind any round bars down to result in effectively a series of had cylinders
along their length with the flat side up.
I would advise the opposite and the metric to use in evaluating the
difference is the mass fraction of charcoal produced by the fire. We found
(for reasons that are not yet known) having a flat top definitely produces
more char thus losing more heat. It may have something to do with the
thermal contact the char piece makes with the metal, conducting the heat
away. This lowers the temperature of the 'coal' and causes it to burn poorly
or go out. There was a large mass difference for flat and round bars - more
than double. The thermal contact between a coal and the round bar is much
smaller.
That is the only 'guess' I have so far. We will look into this further at
YDD this year. The two things tried were round bars from mild steel
(multiple welded pieces) and cast iron with a flat top (single piece). Cast
iron conducts less heat than mild steel but it still consistently produced
much more char. That is not useful as fuel in most homes and it is tossed
with the ash. Indar reported the round bar grate produced virtually no char
at all, finishing its burn at virtually the same time as the wood. That was
amazing.
You may need to restrict the air entry area to limit the air level below the
combustion chamber. If it is 'right' you will see large flames wandering
around in a low velocity environment below the pot - no flapping arms of
flame. You should limit the pot gap (by shaping those tongues of clay) to
about 7mm for all pot sizes. This means trimming the slanted ones and
lowering the top ones (in most stoves).
The combination gives you the right balance of primary and secondary air.
Nzuri kuhusu
Crispin
</pre>
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