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

[Crispin Pemberton-Pigott]

Dear Kevin

Great news. Thank you for the update. I shall discuss further with friends...

Crispin

From: kevin at sun24.org
Sent: October 21, 2022 4:00 AM
To: stoves at lists.bioenergylists.org; bteune at snv.org; rongretlarson at comcast.net; ntbakerphd at gmail.com
Reply to: stoves at lists.bioenergylists.org
Subject: [Stoves] Cooking bands - Testing with wood - 42% more efficient than three stone

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://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0973082620302775&data=05%7C01%7C%7Cf49193cb53164f04aad008dab34b0a25%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638019432132613621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=fp%2BQ02lODPfPCO0uwfYPKikr8Io6QJRdcEpZbMqAk4I%3D&reserved=0>.


THREE STONE W ROCK BED

5 litres of water

Time at which water boiled: 23 minutes.

Fuel used: 1.2kg.

[https://lh3.googleusercontent.com/_euPbO3r0c5l3KczRAbIKflOnO5dIQ2J3s7yldeS8TOfgQszTdpnZYowgJ6NRSuAmR9b3_TPBg3RrK5GH8Qjf2mXq_oZJYy8pGHcb7Q-McDdA7RbtJTLUjkLti1KnSh1L0i3q0Zz7rJkgGChFA0mEXzKSDt0I8518haxVIay7oD1iVg5JtqptU3iNg]


BAND

5 litres of water.

Time at which water boiled: 15 minutes.

Fuel used: 700g.

Much less smoky than three stone with rock bed

[https://lh6.googleusercontent.com/VksVVTzfJWB0M5KnWZ6DyJWnFuAjElHzJaPZpTknVT9_S6IiNG0qnnlqdBQf-gllKBmb9MxPxZL3nGARDpoFTTbaTRvYqe-7Or5Txm50R4cuAjIV1rl2__Dv54zN_AM4vcl1PPrFU1WO_RsKroXamkWc_O40Z3ipJZ59cNpKb_UHbYKSjSzw9HrPVA]

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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