Tami - today you said in part:
> This all makes TOTAL sense, but NONE of it changes the fact that I
have
> some coal that is used for cooking in Yunnan province, and it is
> typically lit by putting on top of a wood fire. These people (1) do not
> have fans;
(RWL): I have been impressed in several places with the use of "fans"
(not electric - but hand-powered) to control the power output from charcoal
fires. My guess is that the power (or fuel consumption rate) output might
be tripled over natural convection. This is something we would avoid - but
I guess is quite common place.
>(2) I have tried it with fairly small (walnut sized) chunks;
(RWL): Not expert - but think starting might be easier if even
smaller.
> (3) have done radiation cavities as best I can. I am burning this in a
> simulated firepit which is how they do. I have lined it with ashes, but
> no insulation other than that; I did a trial with firebrick around the
> outside of the pile to avoid heat loss, but it didn't seem to help much.
>
(RWL): Paul Hait has been vocal in the past on the importance of
reflection - and he uses stainless, which is not presumably used in Yunnan
province. But one can get much of the same effect with outer linings that
are as white as possible. The reflection property may be as important as
the insulative value (including from ash).
I need to repeat the value of height in the surroundings. Might you
increase the depth of the pit?
Wish we could be of more help.
Best of luck. Ron
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