Question: 13.19 Assuming an average 35% efficiency for power plants and a heating value of approximately 1000 Btu / ft 3 ( 22,000 Btu / lbm

13.19 Assuming an average 35% efficiency for power plants and a heating value of approximately 1000 Btu / ft 3 ( 22,000 Btu / lbm ) , calculate the amount of natural gas required in ft 3 and lbm for generating electricity for each year shown in the table.

Electricity Generation by Fuel, 1980-2030 (billion kilowatt-hours) Year Coal Petroleum Natural Gas Nuclear Renewable/Other 1980 1161.562 245.9942 346.2399 251.1156 284.6883 1990 1594.011 126.6211 372.7652 576.8617 357.2381 2000 1966.265 111.221 601.0382 753.8929 356.4786 2005 2040.913 115.4264 751.8189 774.0726 375.8663 2010 2217.555 104.8182 773.8234 808.6948 475.7432 2021 906.4 20.6 1565.6 782.8 824.0 rounded values 2030 3380.674 114.6741 992.7706 870.5909 559.1335 projected values Data from U.S. Department of Energy.

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