Cengel ch10

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Cengel ch10

  1. 1. CHAPTER 10Refrigeration Cycles
  2. 2. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-1The objective of arefrigerator is toremove heat (QL)from the coldmedium; theobjective of a heatpump is to supplyheat (QH) to a warmmedium.10-1
  3. 3. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-2Schematic of aCarnot refrigeratorand T-s diagram ofthe reversedCarnot cycle.10-2
  4. 4. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-3Schematic and T-s diagram for the idealvapor-compression refrigeration cycle.10-3
  5. 5. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-4An ordinary householdrefrigerator.10-4
  6. 6. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-5The P-h diagramof an ideal vapor-compressionrefrigerationcycle.10-5
  7. 7. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-7Schematic and T-sdiagram for the actualvapor-compressionrefrigeration cycle.10-6
  8. 8. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-9A heat pump can beused to heat ahouse in winter andto cool it insummer.10-7
  9. 9. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-10A two-stagecascaderefrigerationsystem with thesame refrigerant inboth stages.10-8
  10. 10. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-12A two-stage compressionrefrigeration system with aflash chamber.10-9
  11. 11. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-14Schematic and T-sdiagram for arefrigerator–freezerunit with onecompressor.10-10
  12. 12. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-15Linde-Hampsonsystem forliquefying gases.10-11
  13. 13. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-16Simple gasrefrigeration cycle.10-12
  14. 14. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-17A reversed Carnotcycle produces morerefrigeration (areaunder B1) with lesswork input (area1A3B).10-13
  15. 15. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-18An open-cycle aircraftcooling system.10-14
  16. 16. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-19Gas refrigerationcycle withregeneration.10-15
  17. 17. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-21Ammonia absorption refrigerationcycle.10-16
  18. 18. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-22Determining the maximumCOP of an absorptionrefrigeration system.10-17
  19. 19. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-23When one of the junctions oftwo dissimilar metals isheated, a current I flowsthrough the closed circuit.10-18
  20. 20. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-24When a thermoelectric circuitis broken, a potentialdifference is generated.10-19
  21. 21. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-25Schematic of a simplethermoelectric powergenerator.10-20
  22. 22. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-26A thermoelectric powergenerator.10-21
  23. 23. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-27When a current is passedthrough the junction of twodissimilar materials, thejunction is cooled.10-22
  24. 24. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 10-28A thermoelectric refrigerator.10-23

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