Chapter 11

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Chapter 11:Refrigeration Cycles ã Objective:Analyze various refrigeration and heat pump cycles Carnot Refrigerator 1 2 3 4 2 isothermal heat absorption 3 isentropic compression 4 isothermal heat rejection 1 isentropic expansion ã Technical challenges: ã 2 3 compression of a mixture of liquid & vapor ã 4 1 turbine expansion of high moisture content Ideal Vapor-Compression Refrigeration Cycle ã 1 2 Isentropic compression ã 2 3 Constant pressure heat rejection ã 3 4 Throttling ã 4 1 Constant p
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  Chapter 11:Refrigeration Cycles ã Objective:Analyze variousrefrigeration and heat pump cycles  Carnot Refrigerator ã Technical challenges:ã 2  3 compression of a mixture of liquid & vaporã 4  1 turbine expansion of high moisture content 1  2 isothermal heat absorption2  3 isentropic compression3  4 isothermal heat rejection4  1 isentropic expansion  Ideal Vapor-CompressionRefrigeration Cycle ã 1  2 Isentropiccompressionã 2  3 Constant pressureheat rejectionã 3  4 Throttlingã 4  1 Constant pressureheat absorption  Energy Analysis of Ideal Vapor-Compression Refrigeration Cycle ã Convenient to use p-hdiagramã w in =h 2 -h 1 (h 1 =h g saturated vapor atP 1 )ã q L = h 1 -h 4 = h 1 -h 3 (h 3 =h f  saturated liquid atP 2 )ã COP=q L /w in
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