problemset1S2016 (2) - April11,2016 ESP167 EnergyPolicy...

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April 11, 2016 ESP 167 Energy Policy Spring 2016 Problem Set 1: Energy Conversion and Energy Economics Due April 25 1. A person in the US uses an average of 300 Gigajoules of primary energy per year. On a continuous basis, day and night, how many kilowatts of primary energy does the  person use?  The following list gives the energy content of some primary energy sources: Coal  28 GJ/tonne Natural gas 1 GJ/1000 cubic feet Biomass 18 GJ/ dry tonne;  one hectare of land produces 15 dry tonnes Oil 6 GJ per barrel (42 gallons per barrel) Solar energy maximum = 1 kW/m 2 ; US average = 200 watts/m 2 Also, for gasoline 1 gallon = 0.12 GJ These sources can be converted to electricity, heat and transportation fuels with the  following energy conversion efficiencies. Coal can be converted to electricity at 40% efficiency Biomass can be converted to electricity at 40% efficiency Natural gas can be converted to electricity at 50% efficiency, and heat at 80% efficiency. Oil can be converted to gasoline at 90% efficiency Solar energy can be converted to electricity at 12% efficiency. Biomass can be used to make liquid transportation fuels at 60% efficiency.
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