[Stoves] Pulumde

Fri Jun 8 15:01:27 CDT 2012

Dear Xavier

How's things, man?

Please have a look at the combustion chamber on the bottom right of slide 8
in Christa's presentation at ETHOS this year:
http://www.vrac.iastate.edu/ethos/files/ethos2012/SunPM/Roth_GIZ%20charcoal%
20work.pdf 

I was thinking it is probably worth combining the POCA-style grate into the
Improved Malgache you made in Benin though I'd have to think about where the
secondary air would be injected. The layout of the Malgache with preheating
certainly lines up well with POCA grate's basic design (also seen on the
Pulamusa and Mama-musa).

If the preheating entered just above the lip of the chamber holding the
charcoal, the door below could be a two stage opening - one for lighting
(large hole, simple closer) and another small one for primary air control. 

The original POCA (MCS) had separately controlled primary and secondary air
but the way it went to market dropped that. In principle it would be best to
have both, but controlling the burn rate by choking primary air is better
than a JIKO-like door that turns it into a CO-bomb.

What do you think? It would work best with your last round version of the
Improved Malgache, with a primary air supply to the 'fuel holding bowl' then
the preheated secondary air entering between the two cones pouring in
horizontally right at the bottom of the upper cone, driving the fire into a
pointed cone as described a day ago.

There is very little additional material required and it would produce a big
drop in CO because the primary burn could be controlled. It also gives a
large draft for the primary air. When closed, it would settle into a low
flow mostly secondary supply.

Do you want to share a picture of the round Improved Malgache from Benin?

Thanks

Crispin thinking of Zambia and Madagascar

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