1. CHAPTER
6
Entropy

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FIGURE 6-1
The system considered in the
development of the Clausius
inequality.
6-1

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FIGURE 6-5
A cycle composed
of a reversible and
an irreversible
process.
6-2

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FIGURE 6-6
The entropy change of an isolated
system is the sum of the entropy
changes of its components, and is
never less than zero.
6-3

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FIGURE 6-10
The entropy of a
pure substance is
determined from the
tables (like other
properties).
6-4

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FIGURE 6-11
Schematic of the
T-s diagram for
water.
6-5

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FIGURE 6-16
On a T-S diagram,
the area under the
process curve
represents the heat
transfer for
internally reversible
processes.
6-6

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FIGURE 6-19
The T-S diagram of
a Carnot cycle
(Example 6–6).
6-7

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FIGURE 6-36
The isentropic
relations of ideal
gases are valid for
the isentropic
processes of ideal
gases only.
6-8

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FIGURE 6-37
The use of Pr data for
calculating the final
temperature during an
isentropic process.
6-9

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FIGURE 6-39
The use of vr data for
calculating the final
temperature during an
isentropic process
(Example 6–10).
6-10

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FIGURE 6-43
Schematic and T-s diagram
for Example 6–12.
6-11

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FIGURE 6-45
P-v diagrams of
isentropic,
polytropic, and
isothermal
compression
processes
between the same
pressure limits.
6-12

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FIGURE 6-46
P-v and T-s diagrams for a
two-stage steady-flow
compression process.
6-13

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FIGURE 6-49
The h-s diagram for
the actual and
isentropic processes of
an adiabatic turbine.
6-14

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FIGURE 6-51
The h-s diagram of
the actual and
isentropic
processes of an
adiabatic
compressor.
6-15

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FIGURE 6-53
Schematic and T-s
diagram for Example
6–15.
6-16

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FIGURE 6-54
The h-s diagram of the
actual and isentropic
processes of an adiabatic
nozzle.
6-17

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FIGURE 6-61
Mechanisms of entropy
transfer for a general
system.
6-18

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FIGURE 6-70
Graphical representation of
entropy generation during a
heat transfer process through
a finite temperature
difference.
6-19

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FIGURE 6-76
The electrical energy
consumed by a motor is
inversely proportional to its
efficiency.
6-20

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FIGURE 6-77
The efficiency of
an electric motor
decreases at part
load.
6-21