| Boiling Point No. 26 - December 1991 |
I have conducted further experiments to increase the efficiency of my "Jagadeeshwar" solar water heater described in BP 24.
I simultaneously measured the temperature of water in 2 oil tins, one wrapped with transparent polythene sheet and one without and found that the temperature of water in the covered tin was on average 20% higher. The polythene covering helps to reduce heat lost by convection, to reduce re-radiation and to act as a shield against wind cooling' It helps the tins to attain full temperature early each day because of the residual heat. It protects the black, radiation absorbing paint coating against the weather and the polythene sheet is cheap and easy to replace.
Further details supplied from:
Dr A Jagadeesh
Society of Science for the People
21210 Nawabpet, Nellore - 524002
Dr A Jagadeesh
May I take this opportunity to alleviate a bit the gloomy mood reigning at present in Boiling Point about a failure of stoves to economise firewood in developing countries. In the past decade, Emil Haas and I, we have demonstrated that it is possible to obtained radical cuts in firewood consumption with our multi-fuel community stoves. Such stoves, if fired with combustible waste, (available more often than people think) eliminate consumption of wood altogether. At present we are promoting multi-fuel family and community stoves, without chimneys, destined for the poorest. They cut wood consumption by two thirds, or eliminate it altogether. We have developed kerosene and recently waste oil burning stoves to save fuelwood. They work well and do not pollute the environment. All in all, there are stove models and substitute fuels which could stop the hemorrhage of firewood. The question is why are they not more widely used? (See BP24 - "Should Charcoal Stoves be Promoted" ).
Our complaint goes against the almost complete indifference to the large and increasing role of use of charcoal as a fuel in developing countries. Charcoal is the main killer of forests and women who cook with it. The shift from charcoal to firewood, when burned in fuel efficient stoves could result in an enormous economy in firewood.
Waclaw Micuta of REDI, Switzerland
Technical Enouiries to ITDG
One of the most valuable services provided by ITDG is in answering technical enquines. The Technical Enquiry Unit acts as a focus for the Group's information and advisory service and can respond on a wide variety of topics. The TEU has extensive contacts within the UK and Europe. The stove teem and its associates are et your service in this way.
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Contributions to Boiling Point
Contributions are invited for the next three issues of Boiling Point, the main themes of which will be:
No: 27 - Women, Stove Programmes & Nutrition
No: 28 - Biomass Combustion, Chimneys & Hoods
Articles for issues 27 and 28 should reach this office by the end of February for issue No. 27 and end of June for issue No. 28.
ISSN: 0263-3 167
Editorial & Production Team
Tapir my Flavell - Production Manager Ian Grant - Editor
Peter Young - Senior Technical Manager
Peter Watts - Programme Manager
Kathryn Clarke - Sector Manager
Agnes Klingshirn - GTZ Representative
Elke Metzen - GTZ Consultant
Simon Burne - Economist
Emma Crewe - Social Scientist
Caroline Ashley - Social Scientist
M Allen, H & R Chatelain
T Flavell, Agnes Klingshim
K Masakhwe, W Micuta
M Recinos, P Sadaphal, RC Pal, V Joshi
J Usinger, P Young
Cartoons by P Bradbrook
Proof Reading by R Marshall & Peter Watts
Boiling Point is the journal of the Intermediate Technology Development Croup's Fuelfor Food Programme and the GATEICTZ Programme. It is printed on recycled paperby Rugby Community Printworks (aliated to the Rugby Youth Promotion Programme). I TDG is a registered British Charity.
Contributions are welcome in the form of articles of not more than 1,000 words plus line drawings, photographs, simple graphs etc., where appropriate. All correspondence should be addressed to Boiling Point, ITDG, Fuelfor Food Programme, Myson House, Railway Terrace, Rugby, CV21 3HT, UK.
Opinions expressed in contributory articles are those of the authors and not necessarily those of the 17tDG Fuel for Food Programme.
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REQUIREMENTS FOR TECHNOLOGY TRANSFER
Intermediate Technology's aim is to enable poor people to develop and use productive technologies and methods which* give them greater control over their own lives and which contribute to the long-term development of their communities. ITDC is a British charity mainly funded by the Overseas Development Administration.