[Stoves] Cooking bands - Testing with wood - 42% more efficient than three stone

[ajheggie at gmail.com]

Good stuff Kevin, this must be a similar combustion to a Swedish Candle, a
short section of trunk with multuple saw cuts axially toward the bottom.

Andrew

On Fri, 21 Oct 2022 at 11:00, Kevin McLean <kevin at sun24.org> wrote:

> Our testing shows that cooking bands boil water with 42% less wood than a
> three stone cookstove with a rock bed.  Remember that rock beds make three
> stone cookstoves a third more efficient and reduce smoke by more than
> half.  Here is that article
> <https://www.sciencedirect.com/science/article/pii/S0973082620302775>.
>
> THREE STONE W ROCK BED
>
> 5 litres of water
>
> Time at which water boiled: 23 minutes.
>
> Fuel used: 1.2kg.
>
>
> BAND
>
> 5 litres of water.
>
> Time at which water boiled: 15 minutes.
>
> Fuel used: 700g.
>
> Much less smoky than three stone with rock bed
>
>
> Cooking bands are also faster and less smoky.  They do not require
> tending.  Elephant grass stalks, maize stalks, bamboo and cassava stems can
> be used in bands.  Biochar can be made.  A pair of bands (20 cm) costs
> around 1 USD.  Bands with a 25 cm diameter work well in school kitchens.
>
> I hope that others can test further.  I worry that my guys may bring bias
> into their testing.  And they have no training on testing.  (Thanks to Norm
> Baker who intends to test bands with maize stalks.)
>
> Kevin McLean
> Sun24.org
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