Nikolaus Foidl, Nicaragua, October 2005
We buildt a woodgas stove using old computer ventilators.
In the attached foto you see the stove at some 25kw output. At the lowest air supply we still run on some 6 kw output.
To store some of the heat generated we have a hollow wick inserted in the top filled with some 6 kg of magnetite powder( 300micron fine) and during operation the wick and the filling heats up to 700 degrees celsius and gives after using all the woodchips in gasification sufficient heat for cooking another 30 minutes.
Next step will be to include a thermoelectric element in the wall with some 30 watts output to charge a battery for the ventilators . ( ventilators are 1.9 watt and 1.3 watt) The costs for one unit is about 35 US$. In mass production it could be much cheaper. ( The highest costs at the moment is the catalytic honecomb inserted below the wick)
See the full report in Spanish:
Por: Ing. Leonardo Mayorga García, Proleña, Ing. Marlyng Buitrago Santamaría, Proleña/Ecofogones, Ing. Nikolaus Foidl Tulum