The US consumed 16 MMbd of crude oil, 22.5 tcf (trillion cubic feet) of natural
ID: 1717868 • Letter: T
Question
The US consumed 16 MMbd of crude oil, 22.5 tcf (trillion cubic feet) of natural gas, and 1 billion tons (short) of coal. The Btu equivalents are as follows: 1 bbl crude oil: 5.8 million Btu; 1 Mcf gas: 1.03 million Btu; 1 ton coal: 21 million Btu. Compare the energy consumption in the consistent unit of Quad (1 Quad = 1015 Btu). Part A Determine the energy consumption of crude oil in the consistent unit of Quad. Part B Determine the energy consumption of natural gas in the consistent unit of Quad. Part C Determine the energy consumption of coal in the consistent unit of Quad
Explanation / Answer
Part A
Given,volumetric consumption of crude oil Vcr = 16 mmdb = 16 million barrel per day = 16 X 106 bbl per day
where 1 bbl stands for 1 oil barrel
Given 1 bbl of crude oil gives 5.8 million Btu = 5.8 X 106 Btu
Hence energy in Btu per bbl of crude oil, Ecr = 5.8 X 106 Btu / bbl
Energy consumption of crude oil in Btu= Vcr X Ecr
= 16 X 106 X 5.8 X 106
= 92.8 X 1012 Btu
Since 1 Quad = 1015 Btu
Hence 1 Btu = (1/1015) Quad
Hence energy consumption of crude oil in Btu = (Energy consumption of crude oil in Btu) / 1015
= 92.8 X 1012 / 1015
= 9.143 X 1010 Quad
Part B
Given
Volumetric consumption of natural gas, Vng = 22.5 tcf
= 22.5 X 1012 cf
=( 22.5 X 1012 ) / 103 mcf (1 mcf = 103 cf)
= 22.5 X 109 mcf
Given energy in Btu per mcf of gas, Eng = 1.013 X 106 Btu / mcf
Energy consumption of natural gas in Btu = Vng X Eng
= 22.5 X 109 X 1.013 X 106
= 23.175 X 1015 Btu
Energy consumption of natural gas in Quad = ( Energy consumption of natural gas in Btu )/ 1015
= 23.175 X 1015 / 1015
= 2.283 X 1013 Quad
Part c
Given
mass consumption of coal, Mco = 1 billion tons = 109 tons
Energy in Btu per ton of coal, Eco = 21 million Btu = 21 X 106 Btu / ton
Energy consumption of coal in Btu = Mco X Eco
= 109 X 21 X 106
= 21 X 1015 Btu
Energy consumption of coal in Quad = ( Energy consumption of coal in Btu ) / 1015
= 21 X 1015 / 1015
= 2.069 X 1013 Quad
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