[Stoves] RE : Subject: What is your best charcoal stove?

[Xavier Brandao]

Dear Crispin,
Sorry, I wrote too fast. What I meant by "CO2 emissions" was that we want to
increase CO2 absorption by forests by limiting deforestation by producting
stoves which consume as little charcoal as possible.
So the priority is to have a charcoal efficient stove. At the same time, it
should also make less smokes, and cook fast. If it is easy to make, that is
a plus.
Thanks a lot for your explanations, it's definitely worth the try! With the
scarce resources we have, we could make a cooking test to compare the
Pulumusa and the improved Dakar Malgache.
Kind regards,

Xavier



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Message: 6
Date: Wed, 24 Nov 2010 17:17:36 +0000
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: "Discussion of biomass cooking stoves"
	<stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] RE : Subject:  What is your best charcoal stove?
Message-ID:
	
<978656547-1290619091-cardhu_decombobulator_blackberry.rim.net-2138969507- at b
da765.bisx.prod.on.blackberry>
	
Content-Type: text/plain

Dear Xavier

You must get your priorities right in order to succeed. I understand that
you want an existing design that already works. No problem. Also that you
are probably restricted to metal if you want the existing producers to
produce them. 

I think you mentioned the Pulamusa. That is a metal knock-off of the Poca -
the Maputo Ceramic stove. My opinion, for what it's worth, is that the
Pulamusa is not optimised yet and is not as easy to make as an improved
Dakar Malgache.  Further, the Malgache is already known in your area so
changing it is easy. 

As to CO2, don't worry about it - biomass is CO2 neutral. Something you can
offer instead is rapid lighting using a metal cone - a sort of advanced
version of the common round tube. Peter Coughlin, producer of the Poca, has
had signal success with it. It greatly reduces smoke. 

To improve a Malgache you make a second inverted pyramid and mount it above
the one that usually holds the charcoal. The space between then should be
12mm or so.  16mm for a large one. The lower edge of the upper (new) square
cone should meet the grate in such a way that air can pass dowards between
the cones and get into the open space under the grate. You can accomplish
that any way you like. 

Then make a door that seal well. Put the door on so it covers the open side
of the lower section of the stove. The door should have a simple latch
because it remains closed most of the time. 

When lighting, open the door and use the cone as an accelerator. When lit,
close the door. Air enters between the two square 'cones' that form the tray
holding the charcoal. The air goes under the grate then up through it. 

This preheats the air and reduces the volume of flow. 

The result is a fuel saving and reduced emissions, increased efficiency and
a longer, higher temperature  burn. 

Regards
Crispin in Singapore for 1 more minute. 

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End of Stoves Digest, Vol 3, Issue 25
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