[Stoves] ***SPAM*** Re: Briquette stove in cob
Ronal Larson
rongretlarson at comcast.net
Tue Jul 5 17:26:34 CDT 2022
Rok: and ccs
Thanks for many response, inserts below.
> On Jul 4, 2022, at 12:03 AM, Rok Oblak <rok.stoves at gmail.com> wrote:
>
> Hey Ron,
>
> 2. cob is a natural material building method/ material, composed of clay, sand and straw. https://en.wikipedia.org/wiki/Cob_(material) <https://en.wikipedia.org/wiki/Cob_(material)>
> It has good heat accumulation properties, while the straw provides some insulation and durability - so all these make a nice stove structure. Accumulation can be reduced with a fired ceramic liner,which gives a faster heat transfer to the pot and it makes it more durable as well, as the heat would crack the cob eventually. As I've written in the email, i like the notion of building an extra surface right next to the fire hole, so its like a modern kitchen stove-top, where you put your hot pots. Cob is a traditional building method in many countries and its gaining popularity in Europe and other western countries as moder building materials are getting more expensive and people are getting sensitive about the materials they implement in their houses. Natural materials would have better properties, like sound insulation, air cleaning, heat retention, etc.
RWL1. “Cob” (new to me) is a word replaced by (not quite the same) “adobe”.in Colorado. But now - cob looks better - no need for making and drying bricks. Some fantastic lifetimes achieved with cob construction..
Very surprised to see it recommended for chimneys. Clearly needs more application to stoves.
Kevin McLean is already adding earthen “side” materials to his “Sun24” stoves - but maybe not yet in the recommended 1-3-1 ratio for cob.
Anyone else using cob with stoves?
> I recently started to collaborate at Krater, production space in Ljubljana / Slovenia, where we study natural material implementation as building materials and product design We started with invasive species of plants, like japanese knotweed and have this paper brand https://notweedpaper.com/ <https://notweedpaper.com/> We implemented invasive species in cob material, like Goldenrod and Knotweed and some others. Also made biomass briquettes from several different species. We also have a lot of clay and gravel and sand on site, so its easy to experiment.
RWL2: I was surprised at the biomass species that should not be used with cob.
Nice looking paper. I have friends who have recently begun making and selling a paper made from hemp stalks.. Lots of waste in hemp farming.
>
> I was leading the workshop with https://27.bio.si/ <https://27.bio.si/> where we are building a tea pavillion to demonstrate using various 'wild' matrials in contemporary designs, so we have built the cob stove to show how easy and applicable it is to almost every living environment in the world
RWL3: There has been quite a bit of material recently on “Urban Forests”. The standard is to eproduce at least 25-30 of the original native trees for that area. Should be better tied to biochar.
>
> I currently have some other projects on the go, but am looking for extra funds for development - if any of you happen to know for some we could apply, I'd be happy to know about. Also specifically regarding the cooking stoves, designing kitchens, etc. Richard, I have written to Nora Feldmar, but she did not reply - do you have any contacts with her still? I've had some corporate work in last 10 years but finally saved some moneys and have a small support from Slovenia government now for the next 5 years to work more on development projects.
>
> 3. I haven't done any char-making experiments with my stove, but Jed did in his projects, like you know already.
RWL4. How many residents around your area are heating and or cooking with wood? With charcoal production, they can make, rather than spend, money on both - and help the climate. With round briquettes, the pyrolysis front moving out radially from the central hole seems to do so very favorably, with good charcoal resulting (this per Joshua)
>
> 4. Funding from Finland was only for the short trip to Malawi, where I started thinking about briquette stoves, back in 2004. Than I got some support from our university in Vancouver/BC, bt that was it pretty much, apart from my master thesis on vernacular, open source design of cooking stoves in developing countries.
RWL5: Is your Master’s thesis publicly available?
>
> 5. Yes, Joshua really took the idea of the Roket stove to another level! Joshua, is cob building active in your area?
RWL6: Joshua has just responded in a different thread - with many changes (and recent reverse changes) in his life.
I don’t recall Josh ever commenting on his own personal clay formula - but I doubt he is using cob - as all of his work goes through kiln firings. He will have optimized to get crack-free strengt
Thanks for such a full response. We all should be doing as much as your Krater group.
Ron
> Thanks to all for the feedback!
> Rok
>
> On Mon, Jul 4, 2022 at 4:31 AM Ronal Larson <rongretlarson at comcast.net <mailto:rongretlarson at comcast.net>> wrote:
> Rok and List: cc Joshua and Richard
>
> 1. Thanks for returning to the stoves list. Yours was a major topic of conversation many (15?) years ago.
> I apologize to Richard Stanley and several others for not including their later contributions. Richard and I met at a (forgotten theme) confere4nce in Boulder maybe 20 years ago. Good to hear he also is still active.
>
> 2. Can you expand on the word “cob” below.
> Some very nice-looking stoves in your photos.
>
> 3. Many on this list are investigating. char-making stoves these days. I remember reading a little about the Roket and char-making. Anything new on the char-making front at your company? Or in your part of Europe?
> I ask because char is so important for climate and other reasons.
>
> 4. At your excellent site below (https://briquettestoves.com/ <https://briquettestoves.com/> ) there was a nice (but to me unknown) story about your receiving funding from Finland to develop the Roket. Anything more on that we should hear? Good for the Finns!
>
> 5. There were also nice tributes to Joshua Guinto and his work with and extensions of the Rocket toward char-making and biochar.
> Like you, I think Jed is the best artist in the whole stove world. And sculptor and designer.
> I was especially impressed at his 2013 paper (new to me) which couples to your work.
> I include him to get an update on that very advanced 2013 paper found at: https://holeyroket.files.wordpress.com/2013/05/the-holey-roket-stove-and-biochar-project.pdf <https://holeyroket.files.wordpress.com/2013/05/the-holey-roket-stove-and-biochar-project.pdf>
> In order to keep this message only to Rokets, I am starting another separate message to Joshua.
>
> Ron
>
>
>> On Jun 27, 2022, at 6:17 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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