Sustainable Energy
Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 2, Problem 16P
To determine

Find the amount of CO2 emitted per MWh of electricity produced and how does HHV affect the answer.

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1) Heating the water in a 55-gallon water heater requires about 2.0 x 103 kJ of energy.          a) Assume the energy came from natural gas with 80% efficiency; how many grams of natural gas are required?          b) Assume the energy came from electricity with 80% efficiency and that the electricity was produced from the combustion of coal with 30% efficiency; how many grams of coal are required?   For problem above, calculate how much CO2 in grams is emitted to the atmosphere.             For a: Use the balanced equation for the combustion of methane (CH4) to determine how many grams of CO2are produced from the amount of natural gas required.             For b: Assume that coal produces 5.25 kJ of energy per gram of CO2 produced. Calculate how much CO2 in grams is produced.
Calculate the total mass of CO2 in the atmosphere. State all assumptions. Compare this to the actual of ~3.6 ×1012 tonnes. At our current rate of emissions, how long would it take to emit a quantity equal to the present mass of CO2 in the atmosphere
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