Chapter 11 - Chapter 11:Refrigeration Cycles...

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Chapter 11:Refrigeration Cycles • Objective:Analyze various refrigeration and heat pump cycles
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Carnot Refrigerator • Technical challenges: •2 Æ 3 compression of a mixture of liquid & vapor •4 Æ 1 turbine expansion of high moisture content 1 Æ 2 isothermal heat absorption 2 Æ 3 isentropic compression 3 Æ 4 isothermal heat rejection 4 Æ 1 isentropic expansion
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Ideal Vapor-Compression Refrigeration Cycle •1 Æ 2 Isentropic compression •2 Æ 3 Constant pressure heat rejection •3 Æ 4 Throttling •4 Æ 1 Constant pressure heat absorption
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Energy Analysis of Ideal Vapor- Compression Refrigeration Cycle • Convenient to use p-h diagram •w in =h 2 -h 1 (h 1 =h g saturated vapor at P 1 ) •q L = h 1 -h 4 = h 1 -h 3 (h 3 =h f saturated liquid at P 2 ) •C O P = q L /w in
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P-h Diagram for R134a 4 32 1
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Deviation from ideal refrigeration cycle Impossible to control state 4 and state 1 In practice, state 1 is slightly superheated; state 4 is compressed liquid Pressure losses in pipes Imperfect compression (instead of 1 Æ 2: 1 Æ 2’ in fact requires less work) Heat transfer
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This note was uploaded on 01/25/2010 for the course ME 55806 taught by Professor Chen during the Spring '10 term at University of California, Berkeley.

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Chapter 11 - Chapter 11:Refrigeration Cycles...

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