[Stoves] Briquette stove in cob
Richard
rstanley at mind.net
Wed Jun 29 16:59:25 CDT 2022
Cool Rok,
My idea about the suggested use of a round cylindrical form for the cob is based on pure theory in consideration of the following;
Relative to a cube form, a cylinder can be made of much lighter material- as its walls are under equal tension. Such as 5 gallon/~20 liter pails are usually slightly tapered from open top to base which should in theory make molding/ casting the cob around the core insulative / refractory form, a far easier proposition than trying to use a square sided cube mold. Such a cylindrical exterior would also seem provide an inconsistent structural surround to the cylindrical core stove refractory liner.
I have never made -- much less tested-- one, so I defer to you...
Just sayin'
Richard Stanley
> On Jun 28, 2022, at 4:57 AM, K McLean <kmclean56 at gmail.com> wrote:
>
> Hi Rok,
>
> Here is a video on using the cooking hole <https://drive.google.com/file/d/1cHEysp4XfZheuQKXYb9kn9GIeUgwjdzq/view?usp=sharing> and a video on making liner bricks <https://drive.google.com/file/d/1qFTEJjGhFrJ5RrA0_WJYrVSPdE-bNbOn/view?usp=sharing> for the cooking hole. The cooking hole is a 25x25x25 cm hole dug in a three-stone cookstove. When fuel is piled in the hole, it burns without tending, uses less fuel and emits less smoke than in unmodified three-stone cookstoves. The following can be used as fuel: crop waste (maize stalks, cassava stems, banana peels, bean stems, etc.) any size wood except very thin twigs, elephant grass, bamboo, cow dung patties, bamboo, sawdust briquettes and more.
>
> Please let me know if you would like an introduction to my colleague in Kasese who has extensively tested the cooking hole.
>
> Kevin
> Sun24
>
> On Tue, Jun 28, 2022 at 1:42 PM Rok Oblak <rok.stoves at gmail.com <mailto:rok.stoves at gmail.com>> wrote:
> Hej Crispin and Richard, great to hear your reactions;
>
> I was working with hi density briquettes in Kampala (Nguvu briquettes & coffee), but no hole as well. It also seemed the density was kind of not giving enough air, tho we got it going in the stove. I remember the machine was a huge steam thing :) https://briquettestoves.com/2009/07/17/nguvu-stove/ <https://briquettestoves.com/2009/07/17/nguvu-stove/>
>
> Richard, we used the cube mold as it was ready to go; i imagine the round would not be so easy to make and disassemble, maybe a metal barrow cut into 3 pieces. We liked the modern cube format as well :)
>
> I didn't see Kevin’s square hole in the ground kinda-TLUD, can you show me a photo/link to it?
>
> I will send you a photo of the big cob stove when its ready, it will take a month to dry probably! I like the fact that with cob you can make a whole kitchen bord/desk, with shelves and all, as its so nice to have a surface for pots right next to your fire
>
> Cheers!
> Rok
>
>
>
>
>
> On Mon, Jun 27, 2022 at 11:45 PM Richard Stanley <rstanley at mind.net <mailto:rstanley at mind.net>> wrote:
> Rok,
> Good to hear from you! Thanks as ever for your work on finding practical ways to extend the life of ceramic liners . Its an issue which has promised alot of folks as much -in terms of thermal insulation and resulting thermal efficiency as it frustrates-in terms of your mentioned issue of low structural durability.
> Do you find it easier to use a cubic shape for the clay sand exterior? I wonder because , it seems that a simple cylindrical form would be easier to shape and use less material and still be as effective as a thermal ‘ cushion given the cylindrical shape of the rocket stove itself .
>
> Richard Stanley
>
>
> Sent from my iPhone
>
> On Jun 27, 2022, at 7:46 AM, Rok Oblak <rok.stoves at gmail.com <mailto:rok.stoves at gmail.com>> wrote:
>
>
> Dear stovers,
>
> it's been a long time since I've written in the list, but we recently organized a Building with Earth workshop and one detail in the cob table was an integrated cooking stove - a ceramic liner, using biomass briquettes, same type as from Richard Stanley.
>
> It showed up as a great update to the holey Roket stove https://briquettestoves.com/ <https://briquettestoves.com/> as durability is a big issue as ceramic liners tend to crack and break pretty easily due to temperature shocks, but the cob here is making it last for a long time.
>
> I have mixed local found clay and a lot of fine sawdust in the liner and it doesn't make any smoke, only when you push in a new briquette, there is black fumes for a few seconds, until a new one ignites.
>
> If you happen to know any projects this principle would be good to integrate, even for other types of wood, I would be happy to share my experiences and possibly collaborate on redesigning existing stoves with this alternative solution.
>
> Happy and healthy cooking!
> Rok
>
> --
> Rok Oblak, MAA Design
>
> rok.stoves at gmail.com <mailto:rok.stoves at gmail.com>
> briquettestoves.com <http://www.holeyroket.com/>
>
> Gregorciceva ulica 5
> 4224 Gorenja vas
> Slovenia
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>
> --
> Rok Oblak, MAA Design
>
> rok.stoves at gmail.com <mailto:rok.stoves at gmail.com>
> briquettestoves.com <http://www.holeyroket.com/>
>
> Gregorciceva ulica 5
> 4224 Gorenja vas
> Slovenia
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