Indicators and Significance of Air Supply in The Combustion of Wood for Heat

Hans Kubler


Wood burning completely consumes 6 grams of air per gram of oven-dry wood. With less air the combustion cannot be complete, while excessive amounts of air will carry heat out the smokestack or chimney. Contents of carbon dioxide and oxygen in the flue gases serve as reliable indicators of the air supply. The gas percentages and amounts of heat escaping with the flue gases are calculated and are compared with values in the literature. Excessive air causes small heat losses compared to the loss of chemical energy in combustible fire effluents, such as carbon monoxide.


Combustion;air supply;heating;flue gases;energy loss

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