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Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
book

Principles of Sustainable Energy Systems, Second Edition, 2nd Edition

by Frank Kreith, Susan Krumdieck
August 2013
Intermediate to advanced content levelIntermediate to advanced
790 pages
30h 5m
English
CRC Press
Content preview from Principles of Sustainable Energy Systems, Second Edition, 2nd Edition
86 Principles of Sustainable Energy Systems
Solution
Step 1
Compute the PWF using Equation 2.5 or Table 2.1 for the discount rate of i = 10%
PWF( ,)
(.)
.10 1
1
101
0 909
1
=
+
=
PWF( ,)
(.)
.10 2
1
101
0 826
2
=
+
=
PWF( ,)
(.)
.10 3
1
101
0 751
3
=
+
=
Step 2
Compute the present worth of each opportunity benet ow by multiplying the PWF
by the annual benet amount. Note that we use the same signicant gures to report
results as was given in the cost and benet estimates.
Year PWF
Annual
Benet ($)
Present
Worth ($)
A B A B
1 0.909 100 0 91 0
2 0.826 150 225 124 186
3 0.751 200 225 150 169
Total 450 450 365 355
Note that although the total benets are the same, the prese
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Publisher Resources

ISBN: 9781466556966