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Advanced Thermodynamics for Engineers, 2nd Edition
book

Advanced Thermodynamics for Engineers, 2nd Edition

by Ali Turan, D. Winterbone
February 2015
Intermediate to advanced content levelIntermediate to advanced
578 pages
19h 27m
English
Butterworth-Heinemann
Content preview from Advanced Thermodynamics for Engineers, 2nd Edition
This efficiency can be evaluated using Eqn (21.49) to give
h ¼ 1 þ
TDS
Q
0
p
¼ 1 þ
298ð188:71 130:57 0:5 205:04Þ
241820
¼ 1 0:0547 ¼ 0:945: (21.52)
This is exactly the same value as was obtained in Chapter 3 on exergy and availability. The rational
efficiency of this, and any, fuel cell would be 100%. The efficiency of this cell is less than 100%
because the change of entropy as the reactants change to products is negative. Hence, if the value of
TDS < 0 then the cell will be less than 100% efficient, and this is because ‘heat’ equivalent to TDS
must be transferred with the surroundings, i.e. to the surroundings. If TDS > 0 then the efficiency can
be
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Publisher Resources

ISBN: 9780444633736