A temperature of over 300° C is required to start the pyrolysis process and create combustible ‘wood-gas’. Firstly it needs to be transformed into woodgas (pyrolysis), which can then be combusted when mixed with a certain amount of oxygen and ignited. The drier the firewood, the less energy is required to evaporate the water, thus the more energy is available for heating or cooking purposes.įirewood cannot ‘burn’ directly. However, energy content per weight is similar for all hardwood and softwood the moisture content of a firewood primarily determines its energy content. Firewood (synonym: fuelwood) is defined by the Food and Agriculture Organization of the United Nations (FAO) as “wood in the rough (from trunks and branches of trees) to be used as fuel for purposes such as cooking, heating or power production." Firewood can be categorized into hardwood and softwood: in comparison to hardwoods, softwoods burn more quickly and generate less heat owing to a lower energy (carbon) content per volume. The oldest cooking fuel is firewood in the form of logs and branches from trees. A key characteristic of humankind is the ability to control fire and utilize it to prepare food.
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