Waste wood will deliver between 15 and 17 gigajoules of heat value per metric ton. Propane costs $1.90 per gallon. How do you determine which is cheapest, wood or propane?How would I place a comparative value on heat from wood as compared to propane?
You are lacking one (at least) variable. How much does the waste wood cost? Even if it is free, you have to move it, store it, and perhaps cut it to length. There is also the capital cost and maintenance of the burners for the two fuels.
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