Le25 - ME 200: Thermodynamics I Lecture 25: Entropy as a...

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ME 200: Thermodynamics I Lecture 25: Entropy as a property Reading: Sections 6.1, 6.2; SP24, 6.1, 6.3 10/27/2010 1 ME200 Therm I Lecture 25, Prof. Mongia Professor Hukam Mongia Office Hours: MWF 9:30 to 10:30 AM in ME 83 Other times email for appointment; Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200/ Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) Grader: Abhro Pal , abhro.pal@gmail.com
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Recall: Property (p. 6): Macroscopic characteristics; does not depend on history (not path dependent)- T, P, u, h, v or r W= = Work is not a property (p. 37),because it depends on history- path dependent: Heat is not a property (p. 48), because it too depends on history- path dependent: Definition of Entropy 2 10/27/2010 ME200 Therm I Lecture 25, Prof. Mongia
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The 1 st Law of Thermodynamics (p. 53): dE = d Q d W (introduced by Clausius in 1850) Joule, 1947: Mutual convertibility of heat and mechanical work and for their mechanical equivalence. Joule’s experiment (p. 53) for an adiabatic system: du = -d w adiabatic; is not path dependent Kelvin called u as the intrinsic energy The 2 nd Law of Thermodynamics: Kelvin-Planck statement (p. 217 & p. 224) for a single reservoir: W cycle 0 { < 0 for internally irreversible (actual) cycles.
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Le25 - ME 200: Thermodynamics I Lecture 25: Entropy as a...

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