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We describe and evaluate here certain new designs for single-pan wood stoves of high efficiency. The novelty in the design consists chiefly in the use of improved geometries for the combustion chamber and the vessel support. Extensive tests on water boiling and cooking demonstrate efficiencies exceeding 40%; these high values are attributable to stove operation at near stoichiometric conditions. The configuration termed Swosthee is among the most efficient stoves available to date, and is able to burn wet wood under partial loading with little accompanying smoke. Two versions of the same basic design provide inexpensive stoves that retain to a large extent the advantages of the original design like the generation of pollutants at low levels in the flue gases and the ability to handle wet wood.  For the proposed designs the dependence of their cooking efficiency on vessel size has been obtained. These are reflected in terms of specific fuel consumption (whose variation is a function of vessel size). The present designs, when compared to other currently available improved stove designs like Priyagni, Tara, the Tamil Nadu Stove and theAstra three-pan stove, are better with respect to at least one of the following criteria-efficiency, cost, CO emission and portability. The stoves are presently being disseminated in small numbers.

Portable single-pan wood stoves of high efficiency for domestic use