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UCCS PES/ENSC 2500: Renewable Energy Chapter 16 Biomass Energy name: ______________________________ Problem 16.1 How many cords of wood per day would be needed for a wood-fired generating station that produces 1000 MWe continuously (typical of a coal-fired facility) at 35% efficiency? At 35% efficiency, 1000 MWe corresponds to: Assuming that the efficiency of burning wood is the same as burning coal, then the energy produced per day is 4 From Appendix V, the energy content of wood is 1.9 × 10 MJ/cord. Therefore the energy requirement will use Problem 16.4 Estimate the necessary fuel tank volume and fuel mass for a vehicle operating on E85 as compared to a gasoline vehicle in order to achieve the same driving range. The density of ethanol from Table 16.2 is 0.789 kg/L. The density of gasoline from Example 16.3 is 0.72 kg/L. The density of E85 can be estimated to be (0.85) × (0.789 kg/L) + (0.15) × (0.72 kg/L) = ________________ kg/L The energy content of ethanol, from Table 16.2 is 23.5 MJ/L and for gasoline (from Appendix V) it is 34.8 MJ/L. The energy content of E85 can be estimated to be (0.85) × (23.5 MJ/L) + (0.15) × (34.8 MJ/L) = _________________ MJ/L Therefore the ratio of volumes of E85 to gasoline to achieve the same energy content is The ratio of masses is