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CHAPTER
10
Refrigeration Cycles
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10-1
FIGURE 10-1
The objective of a
refrigerator is to
remove heat (Q L)
from the cold
medium; the
objective of a heat
pump is to supply
heat (Q H ) to a warm
medium.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
FIGURE 10-2
Schematic of a
Carnot refrigerator
and T-s diagram of
he reversed
Carnot cycle.
0-2
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10-3
FIGURE 10-3
Schematic and T-s diagram for the ideal
vapor-compression refrigeration cycle.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
0-4
FIGURE 10-4
An ordinary household
efrigerator.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
10-5
FIGURE 10-5
The P-h diagramof an ideal vapor-
compression
refrigeration
cycle.
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0-6
FIGURE 10-7
Schematic and T-s
diagram for the actual
vapor-compression
efrigeration cycle.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
10-7
FIGURE 10-9
A heat pump can
be used to heat a
house in winter and
to cool it in
summer.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
0-8
FIGURE 10-10
A two-stage
ascade
efrigeration
ystem with the
ame refrigerant in
both stages.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
10-9
FIGURE 10-12
A two-stage compression
refrigeration system with a
flash chamber.
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0-10
FIGURE 10-14
Schematic and T-sdiagram for a
efrigerator–freezer
unit with one
ompressor.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
10-11
FIGURE 10-15
Linde-Hampsonsystem for
liquefying gases.
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FIGURE 10-16
Simple gas
efrigeration cycle.
0-12
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10-13
FIGURE 10-17
A reversed Carnot
cycle produces more
refrigeration (area
under B1) with less
work input (area
1 A3 B).
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
0-14
FIGURE 10-18
An open-cycle aircraft
ooling system.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
10-15
FIGURE 10-19
Gas refrigeration
cycle with
regeneration.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
0-16
FIGURE 10-21
Ammonia absorption refrigeration
ycle.
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10-17
FIGURE 10-22
Determining the
maximum COP of an
absorption refrigeration
system.
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0-18
FIGURE 10-23
When one of the junctions of
wo dissimilar metals is
heated, a current I flows
hrough the closed circuit.
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10-19
FIGURE 10-24
When a thermoelectric circuit
is broken, a potential
difference is generated.
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0-20
FIGURE 10-25
Schematic of a simple
hermoelectric power
generator.
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10-21
FIGURE 10-26
A thermoelectric power
generator.
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0-22
FIGURE 10-27
When a current is passed
hrough the junction of two
dissimilar materials, the
unction is cooled.
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10-23
FIGURE 10-28
A thermoelectric refrigerator.
