Lecture 17 - Chap 20:5-8 Entropy and Second Law...

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June 3, 2008 Physics 40B Lecture 17 1 Chap. 20:5-8 Entropy and Second Law Review Announcements Course ieval available this week Formula sheet and Final Exam Information now on ilearn Final exam Friday, June 13 at 08:00 AM , Need SCANTRON F-289-PAR-L e = W Q H = Q Net Q H = Q H " Q C Q H = 1 " Q C Q H Engine Thermal Efficiency Second Law of Thermodynamics Kelvin-Planck Statement Reversibility (and Irreversibility) e = 1 " T C T H Q C Q H = T C T H Efficiency of Carnot Cycle Coefficient of Performance (K) for refrigerator K = Q C W = Q C Q H " Q C K , Carnot = T C T H " T C Clausius (Rudolph) Statement of 2nd Law Coefficient of Performance for Heat Pump K HP = Q H W K HP , Carnot = T H T H " T C
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June 3, 2008 Physics 40B Lecture 17 2 No engine can be more efficient than a Carnot engine operating between the same two temperatures--This would violate K-P statement of 2nd Law
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June 3, 2008 Physics 40B Lecture 17 3 Entropy (S) as new variable (with U, T, P &V) E ntropy Change dS = dQ T for reversible processes ! S = S f " S i = dS = i f # dQ T i f # with units J/K Consider ! S for complete Carnot Cycle ! S = dQ h T h a b # + dQ c T c c d # = Q h T h " Q c T c However,
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