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Dear Ken,
Have you checked out the haybox or retained heat
cooker?
The Haybox has the potential to both save fuel and decrease
exposure to smoke. If the boiling pot of food is placed in a well insulated,
airtight box food continues to cook without the addition of more heat: ends long
simmering. Theoretically, the Haybox can save more fuel than the introduction of
even a very improved cookstove. And it's simple, inexpensive to construct, makes
cooking simpler. It's better if the insulation is either waterproof or protected
from moisture and has an R rating of 7 or more to cook beans.
Insulation is trapped air, small amounts of air separated from
other small amounts of air by a lightweight, relatively non conductive material.
Found examples include: wool, feathers, cork, ashes, sponge, etc. Heavy
materials like earth, sand, clay are poor insulators and will not resist the
passage of heat.
All the best,
Dean Still
Aprovecho Research Center
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