3. Result and discussion
3.1. Performance of stove
The water boiling test was carried out as per the protocol of the Ministry of New and Renewable Energy, Government of India, to evaluate the thermal performance of the system. The thermal efficiency of wood gas stoves was calculated as 26.5%, which is close to 27% as reported by Bhattacharya [23].
The fire hole of stove was filled with dried fuel wood to within 5 cm of the top. It is desirable to have the uniform spread of fire laterally across the surface to provide heat over the whole area. This was accomplished by putting a combustible material, such as diesel-soaked cotton jute, grease, etc. initially on top of the fuel bed. Once it ignites from top, it gives combustible gas (producer gas) and a blue flame is established within 5 min of ignition. It has been observed that the stove burns continuously for 41 min as illustrated in Plate 1. During the testing, temperature of the outer surface of stove was recorded as about 105 °C, which indicates that there is still a chance to minimize conduction and radiation heat losses from the outside skirt of cookstoves. The flame temperature was recorded by a K-type thermocouple and it was about 736 °C during the peak hour of combustion.
3. Result and discussion3.1. Performance of stoveThe water boiling test was carried out as per the protocol of the Ministry of New and Renewable Energy, Government of India, to evaluate the thermal performance of the system. The thermal efficiency of wood gas stoves was calculated as 26.5%, which is close to 27% as reported by Bhattacharya [23].The fire hole of stove was filled with dried fuel wood to within 5 cm of the top. It is desirable to have the uniform spread of fire laterally across the surface to provide heat over the whole area. This was accomplished by putting a combustible material, such as diesel-soaked cotton jute, grease, etc. initially on top of the fuel bed. Once it ignites from top, it gives combustible gas (producer gas) and a blue flame is established within 5 min of ignition. It has been observed that the stove burns continuously for 41 min as illustrated in Plate 1. During the testing, temperature of the outer surface of stove was recorded as about 105 °C, which indicates that there is still a chance to minimize conduction and radiation heat losses from the outside skirt of cookstoves. The flame temperature was recorded by a K-type thermocouple and it was about 736 °C during the peak hour of combustion.
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