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The Principles of Thermodynamics
book

The Principles of Thermodynamics

by N.D. Hari Dass
October 2013
Intermediate to advanced content levelIntermediate to advanced
352 pages
13h 56m
English
CRC Press
Content preview from The Principles of Thermodynamics
The Second and Third Laws 61
second cycle is (1
η
2
)Q
H
=(1
η
1
)(1
η
2
)Q
H
. This means the efciency of the
composite cycle is
η
12
=1(1
η
1
)(1
η
2
) and this is not
η
1
+
η
2
. In fact, the
composition rule for the series case is (1
η
12
)=(1
η
1
)(1
η
2
).Theefciencies
in a serially connected case is not the sum because the heat input for the second is
not the same as the rst, but is reduced.
More explicitly, if Q
H
(T) is the heat absorbed at the higher temperature T, the
work done in an innitesimal cycle is dW =
Q
H
(T)
T
dT. So for the temperatures
T
H
,T
1
,T
2
,...,T
L
characterizing many cycles connected in series resulting in a com-
posite cycle operating between T
H
and ...
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Publisher Resources

ISBN: 9781466512085