[Stoves] Simple Modifications to Traditional Wood Cookstoves - Rocks and Clay Grates

[Ronal Larson]

List,  cc Kevin

	This is to encourage this list to view the two “Sun24” links given below.   Because I was so impressed when I viewed those, I had a nice phone conversation with Kevin yesterday.  A few things I learned:
		  Kevin is a retired lawyer.  Retired for only a year, but already in contact with stove-knowledgeable NGOs in many countries.  Through them, he is offering - for free - improvements in 3-stone use of doubled efficiency, and improved emssions.  Working also with some low-cost rocket designs.  Not yet working on TLUDs - but knowledgeable about them, and supportive at the right price.  Has stove modifications measured in multiples of 10k, I think (in only a few past months).

	His emphasis on major stove improvements at zero cost (better air delivery), with local NGO support, is something we have been mostly missing in our stove development efforts.  Emphasis zero cost - described at these two sites given below.

Ron


> On Mar 28, 2019, at 9:24 AM, K McLean <info at sun24.solar> wrote:
> 
> Sun24 and its partners operate at the primitive end of the cookstove spectrum.
> 
> We have found that both rocks (or broken clay bricks) and a clay grate improve open-fire wood cookstoves' efficiency.  Here are examples of rocks and a clay grate in a three-stone cookstoves:
> <Rocks in 3-stone.jpg>
> <Clay disc grate in 3-stone stove.jpg>
> SNV tested <https://drive.google.com/file/d/183kPF5DrwIR5mdDhE7xC9AaNJLaorGZt/view?usp=sharing> the rocks and clay grate in its open-fire stove.  Here are SNV's results:
> Rocks vs unmodified open fire
> +30%    Thermal efficiency
> -27%     Wood fuel used
> -53%     CO 
> -57%     PM 
> Clay grate vs unmodified open fire
> +52%    Thermal efficiency
> -47%     Wood fuel used 
> -57%     CO 
> -58%     PM 
> 
> Early user feedback suggests that rocks in traditional charcoal cookstoves also improve efficiency.  We are expanding our informal field testing and hope to test in the lab soon.
> 
> Since rocks and broken clay bricks are free and ubiquitous, we only need to disseminate the idea, not a product.  We are rapidly disseminating the idea with success in Kenya, Uganda and India by training women group association leaders to train others who then train at the local level.  In Kenya and Uganda we are working with the Catholic and Anglican Churches.  In just a couple months and at low cost, we have trained tens of thousands of women to use this simple modification.  The trainers' feedback is that the users love it.
> 
> Here is our occasionally-but-not-frequently-enough updated Cookstoves Overview <https://docs.google.com/document/d/1ZryS7gQ1q3zKLZPM2KcXdtIHbOYQp4PbloPqMvrlZ5Y/edit?usp=sharing>.
> 
> These cookstove modifications are a transitional first step but they are important.
> 
> All suggestions are welcome and appreciated.
> 
> 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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