Dr. N. Sai Bhaskar Reddy, CEO, GEO December, 2011
http://e-geo.org
See the attached pdf (about 150kb): Understanding Stoves
it is an excellent brief summary that highlights the important aspects of stoves design and testing. e.g. fuels, fuel preparation, stove design, materials, use and testing.THE SNEAKER BULLETIN
Comments
Erin Rasmussen replied on Permalink
What a wonderful review.
What a wonderful review. There is a little bit in there for everyone. What sticks in my mind as a designer is the need for a very low biomass stove for cooking on the floor. If it is going to work well at that height, and not have a fan, it is going to have to be a cross draft stove with a chimney or short chimney. Perhaps we should be concentrating on that because if we find an acceptable answer, hundreds of millions will be adopted.
Thanks
Crispin
Erin Rasmussen replied on Permalink
Short Pipe Chimney
when one uses the word chimney in India, the general perception is that of a long tubular structure, meant for leading the smoke out of the house. It costs more than the stove itself, and therefore, it is generally rejected by stove designers. What you are refering to is most probably a shorter pipe, which would serve to create draft and not as a device to take the smoke out of the house. Interesting idea.
Yours
A.D.Karve
Erin Rasmussen replied on Permalink
Stove height and Cooking from the Floor
Dear Crispin,
Thanks a lot. In the two pot stoves, while the gases move towards the second pot, there is some length and time for gases for combustion. In the two pot stoves the draft of the flames is across before reaching the second pot. Importantly, for the single pot stoves, short chimney is a great idea. I agree with Dr. Karve the cost of chimney costs more than the stove.
The height of a average Indian women while sitting on the floor and cooking is about 2 to 2.5 feet (it will be even less when they bend in acute angle to reach the stove, as they cannot sit too close to the stove). It is almost inconvenient for them to cook on a stove along with the cooking vessel which reaches above 1.5 feet.
Similarly for institutional stoves, especially for the cooking needs of 200 for more and served at a time (schools / hotels / etc.) the height of the stove is a major concern. From the surface of the ground they will never let the height of the stove exceed 6 inches. I had to literally push the stove into the ground and create a ramp to meet the needs of the cook. Because for stirring and lifting the cooked food from fire, etc., are the difficult tasks. The utensil is usually dragged to the serving area.
Dr. N. Sai Bhaskar Reddy
Erin Rasmussen replied on Permalink
Dear Xavier, Crispin, Rok,
Dear Xavier, Crispin, Rok, Krishna, Tom Miles and All,
Thank you.
>Xavier Brando: Yes, height is the major concern for institutional stoves, so I discovered also.
>Crispin: We found in Swaziland where people are not tall and the cooks are often
teenagers that access to the pots was important. The height of the stoves
that hold a 70 litre pot is not really reducible. Thus we build a step
beside each stove, at least two, from concrete blocks or recycled bricks. It
happens that stoves are often installed in pairs so the steps are usually
placed between them allowing access to both stoves.
The steps are important for accessibility. Recently I have prepared a kitchen and other spaces plan with some of the aspects including steps.
https://picasaweb.google.com/saibhaskar.gsbc/KitchenPlanForSchools
For institutional stoves facilitation stove design, kitchen and other spaces are also important. Sometimes facilitating a good stove for a new institutional kitchen is easier than for the existing institutions.
Especially in the government schools in Andhra Pradesh, 99% of biomass stoves in use are three stone stoves (Mid-day meals are served in the government schools as per the policy by Government of India). Three stone stoves require less space and these stones (stove) can be moved to any place as per the convenience. The roof of the kitchens in majority of the cases is very low. The percentage of cost spent on kitchen as compared to all the infrastructure cost in many institutions is less than 1%. In many schools there is no kitchen created yet (cooking is done in open places / under the trees). Most often there is no allocation of budget to create a good kitchen. The cost of a good stove and installation charges should be part of the kitchen. Stove, Kitchen and other spaces are integral part of facilitation of good stoves. To facilitate institutional stoves successfully, I had to look at the below aspects:
(Note: In India, people have traditional beliefs (Vaastu), that is kitchen should be located in the south east corner in a building. Which can also be understood scientifically (Aspect / wind directions). Sometimes people don’t cook if the kitchen is not located as per Vaastu.)
> C V Krishna : ..Apart from the excellent cascading of the needs for understanding the stove, I feel this funda of yours in simple language will serve us to teach the school students above standard VI.
>Tom Miles: This is an excellent idea. In the committees of the Global Alliance for Clean Cookstoves we discussed and recommended educating bureaucrats but it would be far more effective to educate students about stoves.
Yes, educating and creating mass awareness among students is important. It is strange that in the text books of schools / universities, there is no mention of the word “STOVE”. We have regular programs in the schools for awareness on stoves https://picasaweb.google.com/saibhaskar.gsbc/AwarenessToChildren . As well facilitating institutional stoves as part of the project Good Stoves and Biochar Communities Project, supported by GoodPlanet.org.
Dr. N. Sai Bhaskar Reddy