One of the key issues in developing countries is changing the wood stoves people use for cooking so that they are more efficient and emit fewer harmful pollutants. Gasifying stoves are one area where research is still ongoing, and this demonstration is of a stove that uses a fan powered by two AA batteries. Being battery powered, this is not intended for use in developing countries, but is aimed at the outdoors and camping market in developed countries. However, some of the profits from its sale go to fund research on developing a similar stove for developing countries, but with a thermoelectric generator to power the fan.
Here’s the details on how it works.
It’s a WoodGas CampStove. What it does is “gasify” the wood, burning the gas produced in an efficient manner right under the cooking pot. Basically there’s a cylinder inside it that you fill with small sticks: