[Stoves] energy efficient wood stoves in central america

[Dean Still]

Dear Charlie,

As far as I've seen Roberto Lou Ma in 1981 designed one of the first
tortilla making stoves with chimney. His book "Evaluacion de la Eficiencia y
Utilidad de Pequenas Cocinas a Lena para la Area Rural" was published by
CICON in Guatemala. He used a stove top made from cement not steel or cast
iron. The GERA stove is along the same lines.

There are pluses and minuses to both approaches. Sinking the pots a bit (Ma
had three holes) uses up a lot of the heat in the gases when proper gaps are
used, etc. A comal over the first hole is for making the tortillas.

When steel or cast iron is cheap enough it's great to use it, the whole
surface can be used for cooking, although every bit of the top that is not
touching a pot or a tortilla is only heating up the room.

Just wanted to make sure that this original "plancha" stove is considered.

Cement plastered adobe and cement block stove bodies look the same.

All Best,

Dean

On Fri, Jan 2, 2009 at 6:01 PM, Charlie Sellers <csellers42 at yahoo.com>wrote:

> I happen to be in Guatemala building a few Justa-type stoves and fixing
> ONIL stoves which have been modified so that they can't save firewood -
> mainly I am getting more experience with implementation aspects (so that
> stoves aren't altered in the first place), but also seeing how cheaply
> stoves can be built for.  Of course for each location it is necessary to
> first "derive" (as in, determine from the basic facts) the stove design from
> the needs of the local cooks and the materials available - if you provide a
> stove that uses distant materials or that is not liked then you can neither
> expect cheap nor success.
>
> Much of my costs here are tied up in the metal parts - a hardware store 2
> hole plancha and a custom grate, with a metal chimney being optional since
> masonry is possible - with the plancha alone costing ~$USD 41.  Cement is
> the other necessary costly item at at least $8 for the minimum amount -
> other things are either not very expensive or can perhaps be made using
> somewhat found materials like stone and adobe.  A complication here for some
> styles of plancha stoves is the lack of an existing support platform in
> kitchens since they presently cook on the earth - pouring a small cement
> floor and building a table to bring the stove top to the right height
> increases the total cost and time significantly.
>
> But realistically I find it best to use bought cement blocks and bricks for
> the platform and body of the stove - few here are interested in the effort
> needed for stone, and adobe is not popular if people know that there is any
> other option; speed of construction is worth something too.  Cement bodies,
> like the ONIL stove, can be made more locally (distributed manufacturing) to
> save on transportation costs and they just take forms, but I haven't priced
> out this option - I have no desire to duplicate Don O'Neal's work, just
> learn from it!  The ONIL stove uses a beautiful cast iron plancha (in 2
> parts) that I wish I knew the cost of - I can have custom made flat steel
> ones welded up instead of buying the hardware store ones, but since the
> holes in them are greatly preferred for good reasons, they aren't cheap
> enough to be worth the trouble for small numbers.  And cast iron is the very
> best - we just all need to coordinate our efforts so that the same few
>  factories are used when possible, since they just keep getting cheaper as
> the volume goes up.
>
> There are lots of other details I won't go into - there are better options
> for combustion chambers and insulation materials (at least compared to ashes
> - we are lucky to have volcanic pumice here) - but the bottom line appears
> to be cheaper durable planchas by any hook or crook, and then MAYBE we can
> approach $50... but with huge amounts of labor for construction (which you
> may need to pay for).  And don't forget that some designs can be modified if
> there is not proper training and follow up - I see this too often in some
> towns with ONIL stoves because concrete is easy to hack to get the desired
> bigger fuel opening.  It is very easy to end up with a stove which removes
> most of the smoke so gives the health benefits, but gives no fuel savings.
>
> I would love to compare experiences, designs, construction details, costs,
> etc. and think that this is what we'll need in order to be able to access
> carbon credit funding for this huge geographical region - a few stoves here
> and there is just not worth the trouble for those people - and have plenty
> of photos.
>
> Charlie
>
>
>
>
>
>
>
> ________________________________
> From: tom abeles <tabeles at hotmail.com>
> To: stoves at listserv.repp.org
> Sent: Monday, December 22, 2008 3:15:33 PM
> Subject: [Stoves] energy efficient wood stoves in central america
>
>
> we have been looking at energy efficient stoves for use in central
> america's rural areas
>
> we have seen:
>
> prefab, ONIL stoves
> field fabricated using std parts stoves
>
> both of these, when installed cost over USD 100 which is cost prohibitive
> unless heavily subsidized
>
> -----------
> a field constructed stove which uses local materials which cost 1/4 of the
> above and which can be locally built and financed
>
> ------------------
> we are looking for alternatives similar in cost to the locally fabricated
> stoves and which have a high energy efficiency
>
> thanks
>
> tom
>
> tom abeles
>
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