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

[K McLean]

I don't think I shared this video <https://youtu.be/5M4ntJi_JmY> with this
list.  Some of the same principles are probably at play. This is a
comparison of two piles of maize stalks.  The traditional way of burning
maize stalks in Africa is by lighting the pile on the side, as was done
with the pile on the left.  The pile on the right was lit on the top.  The
difference in smoke is stunning.

On Fri, Oct 21, 2022 at 5:36 PM <ajheggie at gmail.com> wrote:

> 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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