In wet mill ethanol plants, a total energy of 74,488 Btu (British thermal units, a common energy unit) is used to produce 1 gallon of ethanol. If ethanol can provide 76,330 Btu per gallon, what is the net energy yield for one gallon of ethanol?

The energy yield for one gallon of ethanol is 2.473 %.

Explanation:

The net energy yield (), expressed in percentage for one gallon of ethanol is the percentage of the ratio of the difference of the provided energy (), measured in Btu, and the energy needed to produce the ethanol (), measured in Btu, divided by the energy needed to produce the ethanol. That is:

(1)

If we know that and , then the net energy yield of 1 gallon of ethanol:

The energy yield for one gallon of ethanol is 2.473 %.

answer:

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