1. Refrigeration Cycle

2. 10-1 Vapor-Compression Cycle 10-1-1 The Reversed Carnot Cycle Coefficient of Performance T s 4 1 2 3 T H T L

4. 10-1-2 The Ideal Vapor-Compression Refrigeration Cycle Equipments: condenser 1 2 3 4 compressor Expansion valve evaporator

5. T s T H T L 1 2 3 4

6. condenser compressor evaporator Capillary tube

8. 10-1-3 The COP of Vapor-Compression Cycle h-s diagram h s 1 2 3 4

9. Usually p 1 , p 2 are available 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 h s 1 2 3 4

10. p-h diagram

11. p h 1 2 3 4

13. 10-3 Heat Pump An equipment Absorbing heat from environment for heating purpose T s T H T 0 1 2 3 4

14. Heat pump for heating

15. Heat pump for refrigeration

16. 10-4 Innovative Vapor-compression Refrigeration Systems 10-4-1 Regenerative Vapor Compression cycle Equipments condenser evaporator Heat exchanger separator compressor

17. T-s Diagram T s T H T L 1 2 3 4 2’ 1’

18. 10-4-2 Cascade Refrigeration Systems condenser evaporator

19. T 0 T-s Diagram T s

20. 10-4-3 Multistage Compression Refrigeration Systems condenser evaporator Flash chamber 1 2 3 heat exchanger 4 5 6 7 8 9 T s 1 2 3 4 5 6 7 8 9

21. 10-4-4 Multipurpose Refrigeration Systems with a Single Compressor condenser Freezer refrigerator 1 2 3 4 5 6 Alternative path T s 1 2 3 4 5

22. 10-4-5 Liquefaction of Gas Heat exchanger Make up gas Liquid removed Multistage compressor 1 2 3 4 5

23. T s 1 2 1 3 4 5

24. 10-5 Gas Refrigeration cycle 10-4-1 Equipments Heat exchanger Q H Heat exchanger Q L compressor turbine

25. T s p 2 p 1 1 2 3 4 T 0 T L

26. 10-4-2 COP of Gas Refrigeration Cycle T s 1 2 3 4 T 0 T L

27. T s 1 2 3 4 T 0 T L

29. T s T 0 T L

30. 10-4-3 Regenerative Gas Refrigeration Cycle T s T 0 T L 1 2 4 5 3 q 6 q

31. compressor turbine regenerator 1 2 3 4 5 6 Heat exchanger Q H Heat exchanger Q L

32. 10-6 Absorption Refrigeration System heat condenser evaporator =compressor

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

34. 10-6 Adsorption Refrigeration Active carbon evaporator condenser Solar energy

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

36. The End of This Chapter Thank You