[Stoves] "Vom Pyrolysekocher zur terra preta" Workshop 11-12.06. --> Clay TLUDs

[Rebecca A. Vermeer]

Hi Crispin & All, 
  
Crispin:  "The long term future of stove materials is glass and ceramic‎. We should get started on those materials. Most stove clay materials are pretty crummy." 
  
Has anyone heard of or tried mixing clay with calcium aluminate to enhance the clay's high thermal shock resistance?   My colleague and former treasurer of a seniors housing society used to work with Lafarge.  He suggested I contact Kerneos :which I did but no response to date.  Have a look at     http://kerneosinc.com/aboutus.php       . 
  
Rebecca 
  
From: "Crispin Pemberton-Pigott" <crispinpigott at outlook.com> 
To: "Julien Winter" <stoves at lists.bioenergylists.org> 
Sent: Friday, May 6, 2016 1:41:42 PM 
Subject: Re: [Stoves] "Vom Pyrolysekocher zur terra preta" Workshop        11-12.06.        --> Clay TLUDs 

Dear Julien 

‎I want to run a materials test on your project. Could be fun.  

You are willing to use advanced materials like stainless steel, prefabricated pop rivets, punch presses and sheet metal folding tools, right? If it made a really good product and sold well at a low cost, that would be acceptable, right? 

Let's contrast that with a willingness to invest in the development of a ‎very strong, long life, high thermal shock resistant material for a cost similar to that needed to get half the equipment to work with sheet metal on a mass manufacturing basis.  

Once you have the right formula and firing program for a stove body, it would be extremely cheap to make. Far cheaper than stainless steel. Let's settle for a figure of 'less'. 

‎So, who is willing to solve the problem long term at low cost by developing the material needed? It would not cost more than tooling for metal stove production. Suppose it was $50,000 and the stove ended up costing $2.50 to produce.  

Are you getting my point? Projects are willing to tool up several workshops to make stoves from expensive material, but not to apply the same level of professionalism to working with clay.  

Why? 

Is it because clay is viewed to be the same as 'free dirt'? The long term future of stove materials is glass and ceramic‎. We should get started on those materials. Most stove clay materials are pretty crummy.  

Regards  
Crispin 
‎ 
Dear Dr Karve. 

It is interesting to see the contrasting conditions in South Asia.  I will have to ask my colleagues in Bangladesh how they forecast the use LPG there, and whether the increase in export trade will make LPG common in the future.  At the moment, locally produced natural gas is an important fuel for urban areas, but I am told that demand is greater than supply, and the gap is getting wider. 

I am assisting the Bangladesh Biochar Initiative, so you can guess what our perspective is on LPG vs biomass fuel.  We would like to make food production and water filtration a by-product of cooking.  Clay TLUDs could make the technology more widely accessible. However, good biomass fuel (i.e., trees) is in short supply, so to improve the energy supply for households, a diversity of energy sources is helpful.  Sea-level rise is not going to help matters. 

Of course, ARTI is also working with biochar. 

Thanks again, for you insights. 

Cheers, 
Julien. 

-- 
Julien Winter 
Cobourg, ON, CANADA 

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