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Christa Roth's excellent report
Micro-gasification: Cooking with gas from dry biomass

has a new location:
https://energypedia.info/wiki/File:Micro_Gasification_Cooking_with_gas_f...

Her comprehensive survey of micro-gasification technology has great technical information and is well worth the read.

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This study Putting the cook before the stove: A user-centred approach to understanding household energy decision-making from the Stockholm Environment Institute takes a look at existing cooking patterns in the Haryana State in northern India where several improved cooking stove projects have taken place.

In the study location, the researchers extensively interviewed householders about their stove building and cooking habits. In this area, Mothers and daughters often build portable or fixed place Chulha stoves that they use to burn dung, wood and straw. The authors did a great job of interviewing stove users and attempting to understand from the users point of view, why these unimproved mud stoves were used more often than the improved stoves that they had available.

Burning dung, is a vital part of the local economy and culture of this place, and the women cooking, use the dung for low simmering, in a purpose-built mud stove. It doesn't look like that stove usage was effectively replaced by the improved stoves that have been introduced in this area. The local cooks also pan fry and then bake roti, which they bake pretty easily in the local chulah stove, and the Philips and Oorja stoves don't have a place to do this baking.

It seems like cooks in this area don't mind having multiple stoves for different purposes, and this type of study is essential to understanding what the cooks needs are before we try to address those with improved stoves.
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PelletMaker PM 75E  PM 44E, PM 22E

EcoWorxx in Germany is selling a line of pellet makers that take materials from dry, chopped fuel to complete pellets that are suitable for use in stoves and other applications.

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Institutional Stove Solutions - InStove

Aprovecho's larger stoves - the instiutional stoves group, have now branched out and become

Institutional Stove Solutions (inStove)

http://instove.org/

They are using the same rocket stove, and have perfected a 60L stove for institutional stove.

They are focusing on schools and other institutions, and have attached an autoclave for hospital and clinic use.

They've found a way to do "Stove factory in a Box", and have perfected a way to build the stove with local labor, and with all tools provided in the factory box and requires only a small generator to operate long term. AIR JORDAN

B/S/H BSH Bosch und Siemens Hausgeräte GmbH has decided to continue the Protos plant oil cookstoves that they had been working on in Indonesia, and instead made the technology publicly available for commercial manufacturers:
http://www.bsh-group.com/index.php?12765

The family of plant oil stoves, including the Protos stoves, were designed to be safe, and reliable cookstoves for low income residents of Indonesia. BSH found that despite having a lot of plant oil available, there was no reliable network of distribution of that oil, and it was keeping users from being able to use the stove. The plant oil stoves also require a lot more cleaning and maintenance than kerosene stoves. Between the difficulty in getting fuel, and the additional maintenance, it was difficult to expand the stove project beyond the initial pilot projects, and BSH eventually concluded that this project was unfeasible.

There's more detail on their web site: http://www.bsh-group.com/index.php?109906
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Eliodomestico
Eliodomestico Diagram

Designed by Gabriele Diamanti, the Eliodomestico is designed to be an easy to use, small scale solar device to turn brackish or salty water into freshwater for cooking and drinking.

He recently won a design award: http://www.core77designawards.com/2012/recipients/eliodomestico/

and

profiled here: http://www.fastcodesign.com/1670546/a-simple-solar-oven-makes-salt-water...

The design is still in the beginning stages, but it is an interesting application of existing technology.

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If you are using stems twigs etc you need to see this comign out not just chips:

Friends of the wet low pressure briquetting process;

We are seeing many who dive into making up briquettes with all kinds of new presses and blends but who lack a good understanding of what it takes to make a good solid briquette. They give up on use of agro residues because of frustration in getting them to compact, and then resort to use of paper.

Paper is a good shortcut but it cuts you out of the richness of diversity and sustainability of the natural biota thats there. Paper is easy to use just soak it for a few days and you have the base for blending in about anything Great BUT.you will then depend upon it for the future, and with the chemicals used in its manufacture, it is not the best material for combustion either.

With these few bits of experience to add I hope to encourage you to moveon to briquetting with natural resources

With the wet low pressure ambient temperature process (WLPATP ?), fibers are used to bind the materials together. Corn Starch Clay, wax, dung and other additives can bind of course but these may add cost and/or are not necessarily good combustibles.For most of us, its all about getting the material (grasses/ straws/ leaves /stalks/ husks /stems etc., to expose their fibers, and to then dissociate these fibers from their natural matrices, then randomly realigning them in the form of, say, matted hair or a really tight birds nest. (fiber length varies depending upon flexibility. from a few mm to a few cm) .

If processed correctly, natural fibers will flex and then tend to interlock once blended with other materials in a water slurry.
One does not achieve this by simple chopping or even direct use of the fiber without some form of softening (thru partial decompsition, in a hot humid anerobic environment, (under such as a black plastic bag), or as we are learning from our Mayan colleagues in Guatemala, use of agricultural lime (which is traditionally discarded after its use in hot water to soften and de-shell their corn kernals).

I am good, pretty busy with the work at Prakti and other stuff, there is a lot of good projects and ideas coming up at Prakti, we are living enthusiastic times!

I saw the GIZ 'Pulumde' when I was in Benin, interesting design, looking sturdy like a Roumde and with a grate like a Pulumusa. I remember secondary air was exiting above the charcoal pile from a metal tube attached to the grate, but it wasn't working well, and I think it was taken out later on.

The improved malgache I made wasn't really convincing in terms of performances. Something wrong with the air flow, I guess. Needed a lot of design work, way more than I could do with my small knowledge. Perhaps a two-stage door like you are proposing would improve the performances, yes.

I think GIZ with the Pulumde and you with the improved malgache are on to something.

A few pictures of the improved malgache are attached.

Now my main concern was to make a heat-resistant combustion chamber/cone/grate? Either good and thick metal, either a ceramic one like the POCA you showed me.

Cheers,

Xavier Brandao
Casual Παπουτσια

SeaChar
http://seachar.org

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