Sustainable Energy
Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
Question
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Chapter 7, Problem 1P
To determine

Find the amount of utilization of lithium per year to produce tritium.

Expert Solution & Answer
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Answer to Problem 1P

The mass of Lithium is 2.64×107kg¯.

Explanation of Solution

Take the world’s total primary energy use as 5.7×1020J per year from the preface of the textbook.

The energy per d-t fusion is 17.6MeVfrom Equation (7.6) in the textbook.

The additional energy released from breeding reaction is 4.8MeV from Equation (7.10) in the textbook.

Calculation:

Find the total energy per d-t fusion as follows:

Total=Energyper d-t fusion+Additionalenergy=17.6MeV+4.8MeV=22.4MeVperfusion

Convert the unit from MeV to J.

Total energy=22.4MeV×1.6×1013J/MeV=3.58×1012Jper fusion

Find the required World’s primary energy as follows:

World's primary energy=World'stotalenergyuse× total energy per fusion=5.7×1020J×3.58×1012Jper fusion=1.59×1032fusions

Every d-t fusion needs 1 tritium molecules, which is generates from one L6i conferring to Equation (7.10).

L6i+nH3+H4e

The world energy needs require 1.59×1032L6i atoms.

Consider L6i is 7% naturally abundant. It is calculated as follows:

1.59×10327100=2.27×1033

Consider that the mass of one Li atom is 7u×1.66×1027kg/u=1.16×1026kg/atom.

Find the amount of utilization of lithium per year to produce tritium as follows:

2.27×1033atoms×1.16×1026kg/atom=2.64×107kg

The amount of utilization of lithium per year to produce tritium is 2.64×107kg

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