[Stoves] (no subject)

[K McLean]

Listmates,

Has anyone tried this?

We seem to have significantly increased the efficiency of charcoal jikos by
putting a bed of rocks on the jiko's grate and putting second metal grate
on the rock bed.  The charcoal goes on the second metal grate.   2-3 cm
rocks work.  It works in all metal jikos and clay jikos that we've tested.

Our testing is early and unscientific, but consistent.  25-50% less fuel
used.  Here are three reports.  The Sierra Leone report has good photos at
the bottom.

Sierra Leone
<https://drive.google.com/file/d/12MvBKjxq6PCGCcCHAjSYSeVXXvl7jWjD/view?usp=sharing>

Uganda
<https://drive.google.com/open?id=1zQIY49E1vrfjYl7t5V_shvw70d67QirGWUrbW51tDxo>

Kenya (very few rocks)
<https://drive.google.com/open?id=1MPwHCwKEVqJvuybKB5Yj39nr8fbcopBP>

(The report authors are untrained and not native English speakers.
Especially the Kenya report contains many errors. Please focus on the
consistent final conclusion that a rock bed and second metal grate
significantly reduce firewood usage.)

This may be a very low cost, very easy way to greatly improved the
efficiency of charcoal jikos.  I'd like to hear if there is already a body
of work on this.  Here is my rough drawing:

[image: 20191010_133359.jpg]

Thank you,
Kevin

*Kevin McLean, President*
*Sun24*

*https://sun24.solar <https://sun24.solar>  Sun24 Cookstoves Overview
<https://docs.google.com/document/d/1ZryS7gQ1q3zKLZPM2KcXdtIHbOYQp4PbloPqMvrlZ5Y/edit?usp=sharing>*
*Tampa, Florida, USA*
*+1 (813) 505-3340*
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