In this paper, we study the comparison of heating value of coal with the method of burning charcoal, coconut shell charcoal corn and sang a Updraft and Downdraft. The object is coconut shell and corncob, find the heat by air Oxygen Bomb Calorimeter.Updraft are suitable for solid materials The coconut shell charcoal, the amount of left over a charcoal corn cob The longer the charcoal charcoal Downdraft model is suitable for soft materialsThe shorter the charcoal for the thermal Downdraft higher than those Updraft.
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