Hi Crispin Yes I learned that trick from you and others, we have three other primary air holes on the first layer that enter behind the centre of the fire brick walls (so its not aligned) to help oppose air entry through the outer fuel hole. The fire box also is not enclosed tightly so air can get in between the bricks at the corners of the combustion chamber so it helps oppose the interior fuel hole air entry. With the round shroud, the pot can function as a plug to slow the airflow so we limit excess air to a reasonable level. All these factors help us get the air warmer before it enters the combustion chamber. We have 4 secondary air holes, perhaps we could use more but the masons like to keep things simple. There are compromises on everything. We have found the more holes in the walls the more the structure is vulnerable and difficult to build. Our design aim is profound simplicity, easy to build and easy to use is whats working for us. Our biggest problem to date has been sorting out the mortaring and windows to stop the rows from breaking apart when they are banged with a heavily loaded pot. What we have now the local masons are pretty happy to work with and the women are very satisfied with the lack of smoke and fuelwood savings and speed. One thing that surprised me was how much people appreciated the safety of the stove for children. regards roger regards roger
--- On Thu, 1/24/13, Crispin Pemberton-Pigott <[email protected]> wrote: From: Crispin Pemberton-Pigott <[email protected]> Subject: Re: [Stoves] Introducing a new low cost clay brick stove To: "'Discussion of biomass cooking stoves'" <[email protected]> Received: Thursday, January 24, 2013, 12:40 PM Dear Roger It is possible to make a couple of improvements to the combustion. I will raise this again later because we are onto something very low cost I want to try first in the Keren stove – maybe before the Cambodian meeting where we can show it. Because you have the surrounding wall, one this to try mow is raising the back support (shortening it at the same time to keep the pot level) or cutting part of the brick away to create an air inlet on the back. You will get pre-heated primary air that way, opposing the inflow that comes from the fuel hole. It is an interesting and simple layout that can be built with little instruction. I am not at all surprise by the doubling of the stove number to suit the pots, allowing cooks to run them at the same time at different power levels and for different duration – probably using different fuels, if Indonesia is anything to go by. I like that you can put in large diameter fuel if you want. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Roger Samson Sent: Thursday, January 24, 2013 12:07 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Introducing a new low cost clay brick stove Hi Christa Yes I was happy to see we are in the same session. I don't know about Moushine's Lego stove and we are working in Senegal so I should. Do you have any links i can study before the meeting? The Noflay was inspired by the Esperenza and Lion stove. We just wanted something that was profoundly simpler and cheaper. Crispin allerted me to the problem of clay brick transport costs and breakage and so we tried to keep everything as materially lean and local as possible. In the village in Ndugu Kebbeh Gambia of 420 households, we have installed 250 Noflay stoves already. The demand is over 500 as many households are choosing to install one for the rice pot and one for the sauce pot. Its very encouraging to see the Noflay stove momentum in the area as its less than a year since we started scaling up. The stove is easy to build and easy to use. Its very intuitive to use as the combustion chamber is so similar to cooking with 3 stones. regards roger in -25 montreal --- On Wed, 1/23/13, CHRISTA ROTH <[email protected]> wrote: From: CHRISTA ROTH <[email protected]> Subject: Re: [Stoves] Introducing a new low cost clay brick stove To: "Discussion of biomass cooking stoves" <[email protected]> Received: Wednesday, January 23, 2013, 8:01 PM Roger, good to hear that you will be at ETHOS. Looking forward to discuss experiences, I will be in your session. have you compared the Noflay stove to the LEGO stove that Moushine designed and that GIZ is promoting in Senegal and Burkina Faso? See you there, regards from San Franciso airport Christa Am 23.01.2013 um 21:10 schrieb Roger Samson <[email protected]>: Dear Stovers, We have been working in West Africa to find a new way forward to develop affordable stoves that are cleaner burning and save more fuelwood. At the ETHOS conference, Rebecca Chin and I will give a presentation on the new clay brick stove REAP developed in 2012 and our efforts to install 2000 of the new stoves last year. Since 2005 we have been working in West Africa to introduce the Mayon Turbo and metal rocket stoves in rural communities. Our main problems have been that these stoves were undersized for the large cooking pots, are much too expensive (as Cecil poignantly highlighted) and, in the case of the metal bucket rocket the stove was short-lived. So we went back to the drawing board to develop a low-cost clay brick stove with custom-made bricks to deal with the large pots. Over the past year, with funding from the Canadian Government, we have come up with the Noflay stove or “no problem” stove. The stove is essentially made up of two components: a central combustion chamber of fired bricks and a shroud (a mortared brick wall custom-built to the pot size). In brief, the stove has many of the design features of other large improved clay brick and metal stoves (i.e. low excess air, preheated primary air, secondary air, good heat transfer) but is much less expensive. The total installed cost of the stove is about $10USD and it can hold a 34 cm pot typically used for a household of 12 or more. Compared to other advanced clay brick stoves some key reasons for the low cost of the Noflay is its resource efficiency because of the round shape (i.e. use of custom made bricks in both the firebox and shroud), the limited use of kiln fired bricks and its focus on locally made bricks which reduces transport costs and brick breakage. Please find attached some of the photos of the stove being constructed. regards Roger Samson Executive Director REAP-Canada www.reap-canada.com <1. Noflay combustion chamber and shroud.JPG><2. Mason with Noflay.JPG><3. cooking with the Noflay.JPG>_______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ -----Inline Attachment Follows----- _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ -----Inline Attachment Follows----- _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
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