[Stoves] Remarkable stove

[Julien Winter]

Hi All;

Here are a couple of comments on the "remarkable stove"

1]  It would be a good idea to line the inside of the clay to give the
stone some protection from heat.  Initially, the stove is run at low
temperature to harden the clay, then later as the size of the fire is
increased, the clay is 'fired in place'.  This lining would be easy to
maintain.

2]  I like to think of designing a TLUD insert for this kind of stove as
'stove nesting' (as opposed to 'stove stacking').   If the user wanted to
make char for charcoal or biochar, then the TLUD insert would be used given
also the right circumstances where the user had good TLUD fuel, and a
desire to run a stove unattended at a fairly constant temperature for 30-45
min.

This stove nesting may be the main role for a TLUD where wood or compressed
fuel is not available all the time, or when agricultural residues are
abundant.  TLUDs don't work well, or not at all, with leaves and
agricultural residues.  For example, in rural Bangladesh, people tend to
burn rice straw and leaves in their traditional and improved combustion
stoves during the dry season, and conserve wood fuel for the wet humid
season when burning wet loose fuel would be a smoky mess.

We can get high firepower out of a TLUD when burning small chunks of wood
that form a fuel bed with an open pore-space giving low resistance to air
flow.  I have achieved pore space temperature in a fuel bed of over 1100 °C
in those conditions.  The fire power of the TLUD depends on its diameter,
and the "remarkable stove" seems to be quite large.  If I burn vertical
sticks of spruce lumber with open primary air flow, then stand back!
"Flash-fired goat."  One caveat to creating these kinds of conditions is
that the metal cylinder will degrade faster than with cooler fires.

A TLUD nested in the "remarkable stove" could increase fuel efficiency,
even when char is conserved, because the heat is focused on the bottom of
the wok, and less heat is lost to warming up the mass of rock.   In
Bangladesh, a  concentrator-ring TLUD conserving char had the same (or
better) cooking efficiency (30%) as an 'improved' concrete stove burning
all the fuel to ash.

Cheers,
Julien



-- 
Julien Winter
Cobourg, ON, CANADA
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