Cengel ch06

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Cengel ch06

  1. 1. CHAPTER 6Entropy
  2. 2. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-1The system considered in thedevelopment of the Clausiusinequality.6-1
  3. 3. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-5A cycle composedof a reversible andan irreversibleprocess.6-2
  4. 4. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-6The entropy change of an isolatedsystem is the sum of the entropychanges of its components, and isnever less than zero.6-3
  5. 5. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-10The entropy of apure substance isdetermined from thetables (like otherproperties).6-4
  6. 6. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-11Schematic of theT-s diagram forwater.6-5
  7. 7. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-16On a T-S diagram,the area under theprocess curverepresents the heattransfer forinternally reversibleprocesses.6-6
  8. 8. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-19The T-S diagram ofa Carnot cycle(Example 6–6).6-7
  9. 9. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-36The isentropicrelations of idealgases are valid forthe isentropicprocesses of idealgases only.6-8
  10. 10. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-37The use of Pr data forcalculating the finaltemperature during anisentropic process.6-9
  11. 11. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-39The use of vr data forcalculating the finaltemperature during anisentropic process(Example 6–10).6-10
  12. 12. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-43Schematic and T-s diagramfor Example 6–12.6-11
  13. 13. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-45P-v diagrams ofisentropic,polytropic, andisothermalcompressionprocessesbetween the samepressure limits.6-12
  14. 14. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-46P-v and T-s diagrams for atwo-stage steady-flowcompression process.6-13
  15. 15. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-49The h-s diagram forthe actual andisentropic processes ofan adiabatic turbine.6-14
  16. 16. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-51The h-s diagram ofthe actual andisentropicprocesses of anadiabaticcompressor.6-15
  17. 17. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-53Schematic and T-sdiagram for Example6–15.6-16
  18. 18. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-54The h-s diagram of theactual and isentropicprocesses of an adiabaticnozzle.6-17
  19. 19. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-61Mechanisms of entropytransfer for a generalsystem.6-18
  20. 20. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-70Graphical representation ofentropy generation during aheat transfer process througha finite temperaturedifference.6-19
  21. 21. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-76The electrical energyconsumed by a motor isinversely proportional to itsefficiency.6-20
  22. 22. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.FIGURE 6-77The efficiency ofan electric motordecreases at partload.6-21

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