CHAPTER 11 Refrigeration Cycles 1 2 3 4

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CHAPTER 11 Refrigeration Cycles 1. 2. 3. 4. 5. 6. 7. 8. 9. Refrigerators

CHAPTER 11 Refrigeration Cycles 1. 2. 3. 4. 5. 6. 7. 8. 9. Refrigerators and Heat Pumps The Reversed Carnot Cycle The Ideal Vapor-Compression Refrigeration Cycle Actual Vapor-Compression Refrigeration Cycle Selecting The Right Refrigerant Heat Pump Systems Innovative Vapor-Compression Refrigeration Systems Gas Refrigeration Cycles Absorption Refrigeration Systems 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

1. Refrigerators and Heat Pumps The objective of a refrigerator is to remove heat

1. Refrigerators and Heat Pumps The objective of a refrigerator is to remove heat (QL) from the cold medium, the objective of a heat pump is to supply heat (QH) to a warm medium coefficient of performance (COP) 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Cooling capacity of a refrigeration system 1 Ton of Refrigeration = 200 Btu/min =

Cooling capacity of a refrigeration system 1 Ton of Refrigeration = 200 Btu/min = 211 k. J/min = 12, 000 BTU/hr, = cooling capacity 1 ton(2000 lbm) of water at 0ㅇC into Ice per day For a reciprocating compressor N = rpm of compressor PD = piston displacement v = volumetric efficiency v 1 = specific volume 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

h 2 QH 3 4 QL s 1 (REF) = Tons of refrigeration Note:

h 2 QH 3 4 QL s 1 (REF) = Tons of refrigeration Note: In the above formula, the mass flow rate of refrigerant is in lbm/min and thus the 200 BTU/min factor is used. 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

2. The Reversed Carnot Cycle coefficient of performance (COP) 에너지변환시스템연구실(ECOS) Energy Conversion System Lab.

2. The Reversed Carnot Cycle coefficient of performance (COP) 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

3. The Ideal Vapor-Compression Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

3. The Ideal Vapor-Compression Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

An ordinary household refrigerator A rule of thumb is that COP improves by 2

An ordinary household refrigerator A rule of thumb is that COP improves by 2 to 4 percent for each OC the evaporating temperature is raised or the condensing temperature is lowered 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

The P-h diagram of an ideal vapor-compression refrigeration cycle. 에너지변환시스템연구실(ECOS) Energy Conversion System Lab.

The P-h diagram of an ideal vapor-compression refrigeration cycle. 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Ex 11 -1, The Ideal Vapor-Compression Refrigeration Cycle If the throttling valve were replaced

Ex 11 -1, The Ideal Vapor-Compression Refrigeration Cycle If the throttling valve were replaced by an isentropic turbine (3 ->4 s) - produce 0. 33 k. W power - reduce power input from 1. 81 to 1. 48 k. W - COP increase from 3. 97 to 5. 07 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

4. Actual Vapor-Compression Refrigeration Cycle 1. Fluid friction causes pressure drops 2. Heat transfer

4. Actual Vapor-Compression Refrigeration Cycle 1. Fluid friction causes pressure drops 2. Heat transfer from surrounding to refrigerant 3. saturated liquid 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Ex 11 -2, The Actual Vapor-Compression Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung

Ex 11 -2, The Actual Vapor-Compression Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

5. Selecting The Right Refrigerant 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

5. Selecting The Right Refrigerant 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

6. Heat Pump Systems A heat pump can be used to heat a house

6. Heat Pump Systems A heat pump can be used to heat a house in winter and to cool it in summer. 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

7. Innovative Vapor-Compression Refrigeration Systems A two-stage cascade refrigeration system with the same refrigerant

7. Innovative Vapor-Compression Refrigeration Systems A two-stage cascade refrigeration system with the same refrigerant in both stages. 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Ex 11 -3, A Two Stage Cascade Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab.

Ex 11 -3, A Two Stage Cascade Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Multistage Compression Refrigeration Systems (Multi Compressor) 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Multistage Compression Refrigeration Systems (Multi Compressor) 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Multipurpose Compression Refrigeration Systems with a Single Compressor 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung

Multipurpose Compression Refrigeration Systems with a Single Compressor 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Liquefaction of Gases 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Liquefaction of Gases 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

8. Gas Refrigeration Cycles reversed Brayton cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H.

8. Gas Refrigeration Cycles reversed Brayton cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

A reversed Carnot cycle produces more refrigeration (area under B 1) with less work

A reversed Carnot cycle produces more refrigeration (area under B 1) with less work input (area 1 A 3 B). 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

An open-cycle aircraft cooling system 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

An open-cycle aircraft cooling system 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Gas refrigeration cycle with regeneration 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Gas refrigeration cycle with regeneration 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Ex 11 -5, The simple ideal Gas Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab.

Ex 11 -5, The simple ideal Gas Refrigeration Cycle 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

9. Absorption Refrigeration Systems Ammonia absorption refrigeration cycle absorption of a refrigerant by a

9. Absorption Refrigeration Systems Ammonia absorption refrigeration cycle absorption of a refrigerant by a transport medium - ammonia : refrig. - water : transport 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

Determining the maximum COP of an absorption refrigeration system 에너지변환시스템연구실(ECOS) Energy Conversion System Lab.

Determining the maximum COP of an absorption refrigeration system 에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

에너지변환시스템연구실(ECOS) Energy Conversion System Lab. Chung H. Jeon

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