Chapter10 Refrigeration Cycle 10-1 Vapor-Compression Cycle 10-1-1 The Reversed Carnot Cycle T s 4 1 2 3 THTH TLTL Coefficient of Performance.

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Presentation transcript:

Chapter10 Refrigeration Cycle

10-1 Vapor-Compression Cycle The Reversed Carnot Cycle T s THTH TLTL Coefficient of Performance

Disadvantages Process 2-3 is difficult to be Fulfill in compressor Process 4-1 will do harm to turbine

The Ideal Vapor-Compression Refrigeration Cycle condenser Equipments: compressor Expansion valve evaporator

T s THTH TLTL

condenser compressor evaporator Capillary tube

The COP of The COP of Vapor-Compression Cycle h-s diagram h s

Usually p 1, p 2 are available h s From p 1, get h 1 ”, s 1 ” h 1 = h 1 ” s 1 = s 1 ” From p 2, s 1, get h 2 From p 2, get h 2 ’ h 3 = h 2 ’ h 4 = h 3

p-h diagram

p h

10-2 Refrigerant Ammonia CFC(chlorofluorocarbons) water Good refrigerant High enthalpy of vaporization Not too low evaporator pressure Not too high condenser pressure Nontoxic Noncorrosive Chemically stable Low cost

10-3 Heat Pump An equipment Absorbing heat from environment for heating purpose T s THTH T0T

Heat pump for heating

Heat pump for refrigeration

10-4 Innovative Vapor-compression Refrigeration Systems Regenerative Vapor Compression cycle Equipments condenser evaporator Heat exchanger separator compressor

T s THTH TLTL T-s Diagram 2’ 1’

Cascade Refrigeration Systems condenser evaporator

T s T0T0 T-s Diagram

Multistage Compression Refrigeration Systems condenser evaporator Flash chamber heat exchanger T s

Multipurpose Refrigeration Systems with a Single Compressor condenser Freezer refrigerator Alternative path T s

Liquefaction of Gas Heat exchanger Make up gas Liquid removed Multistage compressor

T s

10-5 Gas Refrigeration cycle Equipments Heat exchanger QHQH QLQL compressor turbine

T s p2p2 p1p T0T0 TLTL

COP of Gas Refrigeration Cycle T s T0T0 TLTL

T s T0T0 TLTL

Since To decrease compression ratio can increase COP To To decrease compression ratio will decrease power ratio

T s T0T0 TLTL

T s T0T0 TLTL q 6 q Regenerative Gas Refrigeration Cycle

Heat exchanger QHQH QLQL compressor turbine regenerator

10-6 Absorption Refrigeration System heat condenser evaporator =compressor

Refrigerant: Ammonia Transport medium: Water Refrigerant: Water Transport medium: Lithium bromide

10-6 Adsorption Refrigeration Solar energy Active carbon evaporator condenser

Cooling Tube Solar energy Night Cold air Active carbon Vacuum tube Cooling tower

The End of This Chapter Thank You

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