Le24 - ME 200: Thermodynamics I Lecture 24: Carnot cycle,...

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ME 200: Thermodynamics I Lecture 24: Carnot cycle, Clausius inequality and its significance Reading: Sections 5.10-5.11; SP24, 5.77, 5.80 10/25/2010 1 ME200 Therm I Lecture 24, 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 , [email protected]
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Carnot Power Cycle 4 internally reversible processes Adiabatic* Compression (W<0) Q=0 Isothermal** Expansion W>0 D T=0 Adiabatic* Expansion (W>0) Q=0 Isothermal** Compression (W<0) D T=0 2 10/25/2010 ME200 Therm I Lecture 24, Prof. Mongia * Thermally isolated ** “Sensible energy” constant
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Nicolas Léonard Sadi Carnot (June 1, 1796-August 24, 1832) Source: http://www.nhn.ou.edu/~jeffery/course/c_energy/energyl/lec005/carnot_sadi_00 1.jpg ; http://www.google.com/imgres?imgurl=http://media-2.web.britannica.com/eb- media/50/44050-004- 248160E3.jpg&imgrefurl=http://www.britannica.com/EBchecked/topic- art/96411/36621/Sadi-Carnot&h=450&w=355&sz=22&tbnid=kwe- guFUaWWktM:&tbnh=127&tbnw=100&prev=/images%3Fq%3Dcarnot&zoom=1&q=c arnot&usg=__Cejm0E1-h10am- emzgjCyvtc7_I=&sa=X&ei=JbulTLifEMT48AawrpDRAQ&ved=0CDIQ9QEwAw Taught by Poisson and Ampère Contemporary of Fourier, Navier, and Coriolis Carnot published a memoir, Reflections on the Motive Power of Fire in 1824 to answer the two questions: “Is the work available from a heat source potentially unbounded?" "Can heat engines in principle be improved by replacing the steam with some other working fluid or gas?" 10/25/2010 3 ME200 Therm I Lecture 24, Prof. Mongia
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1. Steam engine technology had developed well enough without good scientific foundation. Earlier versions had overall efficiency ~3%. 2. Steam engine major inventions by Newcomen in 1712; Watt in 1764. 3. dU= dQ-dW was introduced by Clausius in 1850 which challenged the caloric theory based on two axioms: a) The heat in the universe is conserved; b) The heat in a substance is a function of the state of the substance.
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This note was uploaded on 01/13/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue University.

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Le24 - ME 200: Thermodynamics I Lecture 24: Carnot cycle,...

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