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a standard cord (128 cubic feet) of hardwood and 1 ton of rice coal have about the same btu's so 20 cords ~ 20 tons http://www.uwsp.edu/CNR/wcee/keep/Mod1/Whatis/energyresourcetables.htm

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Q: I heat with 20 cord of wood how much rice coal will you need in comparison?
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How much heat energy is needed to raise the temperature of 5 kg of coal from 20c to 220c?

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