ME300Lecture32 - Lecture 32: Vapor Power Cycle Goal: To...

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32.1 Lecture 32: Vapor Power Cycle Goal: To generate electricity from heat input
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32.2 Continue Vapor Power Cycle Heat Input Sources: » Fossil fuels (oil, coal, natural gas) » Nuclear fission » Geothermal » Solar radiation » Garbage/Trash Cycle Working Fluid: » Water/Steam Environmental Issues: » Air pollution » Thermal pollution » Waste products » Safety
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32.3 Continue Vapor Power Cycle Question: What is the upper limit of vapor power cycle performance? Answer: 1 2: adiabatic, reversible compression 2 3: isothermal, reversible heat input 3 4: adiabatic, reversible expansion 4 1: isothermal, reversible heat rejection 1 2 3 4 s T Q H = T S 23 Q L = T S 14 W net net H L 3 H H 23 2 1 L L 41 4 Note : W Q Q Q Tds T S Q Tds T S T H T L
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32.4 Continue Carnot Power Cycle System Schematic: hot reservoir @ T H T H = constant cold reservoir @ T L T L = constant H Q L Q in W out W reversible, isothermal reversible, isothermal net H L L L 41 L th,C H H H H 23 H Thermal Efficiency: W Q Q Q T S T 1 1 1 Q Q Q T S T reversible, adiabatic
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32.5 Example 32-1 Given: T H = 450 o F and T L = 212 o F Find: Thermal efficiency of Carnot Cycle Solution: th,C = 0.26 T L /T H th,C Question: How to implement the Carnot Power Cycle with a real working fluid?
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ME300Lecture32 - Lecture 32: Vapor Power Cycle Goal: To...

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