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Lecture 24 PES Su 2011 annotated

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

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ME 200: Thermodynamics I Lecture 24: Carnot Cycle and Clausius Inequality Prof. Sojka Summer 2011
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8 July 2011 ME 200 2 In this Lecture … We will: Introduce Carnot devices (heat engines, heat pumps, and refrigerators). Discuss Clausius’ inequality .
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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 Δ T between either reservoir and the engine itself. The work processes must occur in the absence of heat transfer. 8 July 2011 3 ME 200
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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 2011 4 ME 200
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Carnot Cycle 8 July 2011 5 ME 200
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Carnot Heat Engines Some relationships H C H C H H C H Carnot T T T T T Q Q Q - = - = - = 1 η actual Carnot η η 8 July 2011 6 ME 200
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