Description: Slide 1: What is Entropy?

Slide 2: Second law of thermodynamics and Entropy
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Slide 5: The concept of entropy originated around the mid 19th century, from
Slide 6: One of the difficulties was knowing how much heat energy was stored
Slide 7: Another definition of entropy according to Hougan and Watson
Slide 8: Examples of entropy
Slide 9: Now consider a rotating shaft shown in Fig. 7–23.

Slide 10: Instead of raising a weight, let us operate the
Slide 11: Entropy is an extensive property like
Slide 12: Clausius realized in 1865 that he had discovered a new
Slide 13: Reversible Isothermal Heat Transfer Processes
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Slide 15: ISENTROPIC PROCESSES
Slide 16: Third law of thermodynamics
Slide 17: Clausius inequality

Slide 18: ENTROPY CHANGE OF PURE SUBSTANCES
Slide 19: Entropy is commonly used as a
Slide 20: THE INCREASE OF ENTROPY PRINCIPLE
Slide 21: Therefore,
Slide 22: The inequality sign in the previous equation (7-8) shows that the
Slide 23: For an isolated system (or simply an adiabatic closed system), the
Slide 24: Entropy is an extensive property, and thus
Slide 25: A system and its surroundings, for
Slide 26: Since no actual process is truly reversible, we can conclude that some
Slide 27: The increase of entropy
Slide 28: PROPERTY DIAGRAMS INVOLVING ENTROPY
Slide 29: Temperature-entropy diagram

Slide 30: An isentropic process on a T-s diagram
Slide 31: Enthalpy-entropy diagram

Slide 32: Recall that the Carnot cycle is made up of two reversible isothermal

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