Lecture 24 PES Su 2011 annotated

Lecture 24 PES Su 2011 annotated - ME 200: Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 24: Carnot Cycle and Clausius Inequality Prof. Sojka Summer 2011 8 July 2011M E 2002 In this Lecture We will: Introduce Carnot devices (heat engines, heat pumps, and refrigerators). Discuss Clausius inequality . Carnot Cycle Characteristics The heat engine must receive energy ( Q H ) at a higher T and reject it at a lower T ( Q C ). To prevent irreversibilities, Q C and Q H must occur at constant T (i.e., use a thermal energy reservoir) and there must be no T between either reservoir and the engine itself. The work processes must occur in the absence of heat transfer. 8 July 20113 ME 200 Carnot Cycle The power cycle must operate clockwise on a p-V diagram. It consists of four internally reversible processes : heat addition (isothermal) expansion (adiabatic) heat rejection (isothermal) compression (adiabatic) 8 July 20114 ME 200 Carnot Cycle 8 July 20115 ME 200 Carnot Heat Engines Some relationships H C H C H H C H Carnot T T T T T Q Q Q-=- =- = 1 actual Carnot 8 July 20116 ME 200 Carnot Heat Pumps and...
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This note was uploaded on 09/26/2011 for the course ME 200 taught by Professor Gal during the Summer '08 term at Purdue University-West Lafayette.

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Lecture 24 PES Su 2011 annotated - ME 200: Thermodynamics I...

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