sample exam sol

# sample exam sol - EE 113 Exam 1 Solutions Potentially...

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EE 113 - Exam 1 Solutions October 16, 2009 Potentially useful data Description Value The specific gas constant ( κ ) 287 Ws/kg K Acceleration of gravity ( g ) 9.81 m/s 2 Standard atmospheric pressure ( pr ) 101,325 Pa ( N/m 2 ) Thermal energy in coal 27,000 btu/kg btu’s per kWh 3,412 btu/kWh 1 Primary energy The following figure is taken from the BP statistical review, and describes global primary energy consumption over time. The units are million tonnes (1000 kg) oil equivalent. 1. Assume that energy consumption is following a linear growth function. Estimate the linear growth rate and estimate the energy consumption in 2020. (a) Using a straight line from the left to the right of the graph I get a growth rate of rate = 11300 - 6700 Mtoe 25 years = 4600 Mtoe 25 = 184 Mtoe/year 1

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(b) Consumption in 2020 C 2020 = 11300 + 184(2020 - 2008) = 13508 Mtoe 2. Which fuels appear to be increasing as a percent of total energy demand? (a) Natural gas is growing most rapidly: from about 1500Mtoe (23%) to nearly 4000Mtoe (35%). Other fuels are growing, but not increasing much as a percent of total demand.
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