Refrigeration

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  • really good presentation of different ref cycles
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Refrigeration

  1. 1. Refrigeration Cycle
  2. 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
  3. 3. <ul><li>Disadvantages </li></ul><ul><li>Process 2-3 is difficult to be Fulfill in compressor </li></ul><ul><li>Process 4-1 will do harm to turbine </li></ul>
  4. 4. 10-1-2 The Ideal Vapor-Compression Refrigeration Cycle Equipments: condenser 1 2 3 4 compressor Expansion valve evaporator
  5. 5. T s T H T L 1 2 3 4
  6. 6. condenser compressor evaporator Capillary tube
  7. 8. 10-1-3 The COP of Vapor-Compression Cycle h-s diagram h s 1 2 3 4
  8. 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
  9. 10. p-h diagram
  10. 11. p h 1 2 3 4
  11. 12. 10-2 Refrigerant <ul><li>Ammonia </li></ul><ul><li>CFC(chlorofluorocarbons) </li></ul><ul><li>water </li></ul>Good refrigerant High enthalpy of vaporization Not too low evaporator pressure Not too high condenser pressure Nontoxic Noncorrosive Chemically stable Low cost
  12. 13. 10-3 Heat Pump An equipment Absorbing heat from environment for heating purpose T s T H T 0 1 2 3 4
  13. 14. Heat pump for heating
  14. 15. Heat pump for refrigeration
  15. 16. 10-4 Innovative Vapor-compression Refrigeration Systems 10-4-1 Regenerative Vapor Compression cycle Equipments condenser evaporator Heat exchanger separator compressor
  16. 17. T-s Diagram T s T H T L 1 2 3 4 2’ 1’
  17. 18. 10-4-2 Cascade Refrigeration Systems condenser evaporator
  18. 19. T 0 T-s Diagram T s
  19. 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
  20. 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
  21. 22. 10-4-5 Liquefaction of Gas Heat exchanger Make up gas Liquid removed Multistage compressor 1 2 3 4 5
  22. 23. T s 1 2 1 3 4 5
  23. 24. 10-5 Gas Refrigeration cycle 10-4-1 Equipments Heat exchanger Q H Heat exchanger Q L compressor turbine
  24. 25. T s p 2 p 1 1 2 3 4 T 0 T L
  25. 26. 10-4-2 COP of Gas Refrigeration Cycle T s 1 2 3 4 T 0 T L
  26. 27. T s 1 2 3 4 T 0 T L
  27. 28. <ul><li>To decrease compression ratio can increase COP </li></ul><ul><li>To To decrease compression ratio will decrease power ratio </li></ul>Since
  28. 29. T s T 0 T L
  29. 30. 10-4-3 Regenerative Gas Refrigeration Cycle T s T 0 T L 1 2 4 5 3 q 6 q
  30. 31. compressor turbine regenerator 1 2 3 4 5 6 Heat exchanger Q H Heat exchanger Q L
  31. 32. 10-6 Absorption Refrigeration System heat condenser evaporator =compressor
  32. 33. Refrigerant: Ammonia Transport medium: Water Refrigerant: Water Transport medium: Lithium bromide
  33. 34. 10-6 Adsorption Refrigeration Active carbon evaporator condenser Solar energy
  34. 35. Cooling Tube Active carbon Vacuum tube Cooling tower Solar energy Night Cold air
  35. 36. The End of This Chapter Thank You

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