Dear Rajan
Have you got a drawing available for this stove?
Regards
Johan Wessels
South Africa
----- Original Message -----
From: <[email protected]>
To: "stoves" <[email protected]>
Sent: Wednesday, December 01, 2010 4:00 PM
Subject: [Stoves] A low cost modified traditional woodstove
Dear All,
I spent some time recently with Servals team in developing a low cost
improved traditional woodstove - and the result was good.
Basically a traditional looking stove ( a 4 litre metallic container
converted ) - clay lining ( can be changed over to refractory or stainless
steel ), flame concentrator at the top ( similar to TLUD stove ), air pipe
( metallic, around 12" long ) at the bottom.
The flame concentrator has two functions ( as we all know ) :
1. Better mixing of combustion air with the woodgas - for a more complete
burn.
2. Brings the flame to the centre of the cooking pot bottom.
The air pipe ( horizontally placed ) brings a small quantity of air below
the burning wood mass at the centre. This air burns a little quantity of
charcoal, keeping this area intensely hot - this also keeps a stable flame
throughout. Since the pipe is metallic, this air gets preheated ( inside
the pipe ) before it reacts with charcoal. We can imagine what pre-heated
( upto around 300 C ) air can do to an already burning charcoal mass.
We also tried a grate at the stove bottom ( instead of the air pipe ). But
the result was not good. Air pipe has the advantage of pre-heating the air
and also allowing only a controlled quantity of air in. Some perforations
near the hot tip of the pipe adds to the performance.
It takes about 10 minutes for the air pipe to start functioning - ie. when
the stove bottom ( inside ) gets heated up sufficiently to create a
suction through the pipe.
The cross-sectional area of the air pipe can be around 10 % of the
cross-sectional area of the fuel-window ( through which the fuel is fed
in ). For an average domestic stove, 1 1/2" dia pipe should be ideal.
The flame concentrator and the air pipe can be an add-on to any
traditional woodstove - including a three stone fire. Especially the air
pipe is a valuable add-on with negligible cost involved.
The small stove we tested had a fire-power of around 3 KW ( average around
2 KW ). The flame looked almost as good as a TLUD stove ( ND ) flame. The
fire-power can be easily upgraded for larger versions of the stove. Flame
control is like in any trditional stove ( withdrawing the burning wood ).
With Best Regards,
Rajan
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