If the yield of bio-oil to liquid fuels (gasoline- and diesel-like fuels) is \(42 \mathrm{wt} . \%\), what is the overall energy efficiency? Use the values in Table 4.12 for energy content and product yields. First, calculate the biomass to liquid fuel yield based on the biomass to bio-oil and bio-oil to liquid fuel yields. Finally, assume a liquid fuel energy density of \(41.2 \mathrm{MJ} / \mathrm{kg}\) and calculate the energy efficiency.

Table 4.12

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Pyrolysis Mass and Energy Yield Values for Problem Set Component Yield (wt.%) Energy Density (MJ/kg) Biomass 15.8 Pyrolysis oil 65 16.5 Pyrolysis gas Pyrolysis char 21 5.7 14 27.5