Lect8ME200Div2&5CyclesSP2012

Lect8ME200Div2&5CyclesSP2012 - ME 200:...

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ME 200: Thermodynamics I Lecture 8: Thermodynamic Cycles
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Last Lecture First Law for Closed Systems »Q -W = E Selection of Control Volumes
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This Lecture First Law of Thermodynamics » Power Cycles » Refrigeration and Heat Pump Cycles
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First Law of Thermodynamics for Cycles Thermodynamic Cycle: sequence of processes where the thermodynamic system begins and ends in the same thermodynamic state From the first law of thermodynamics, we can write, for a closed system cycle: 0 cycle QW E 
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Thermodynamic Cycles Power Cycle Refrigeration or Heat Pump Cycle
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1 2 3 3 41 W in = -W 12 Q in = Q 23 W out = W 34 Q out = -Q 41 Power Cycle for a Piston-Cylinder System
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Power Cycle for a Piston-Cylinder System p 1 2 3 4 0 cycle Wp d  Note: The cycle drawn is the Otto cycle for spark- ignited internal combustion engines.
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Thermodynamic Efficiency for a Power Cycle For a power cycle, the thermodynamic efficiency is the ratio of the
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Lect8ME200Div2&5CyclesSP2012 - ME 200:...

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