Lecture 23 PES Su 2011 annotated

Lecture 23 PES Su 2011 annotated - ME 200: Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 23: Temperature Scales and Maximum Performance Measures Prof. Sojka Summer 2011 In this Lecture … • We will study: ME 200 – Temperature scales and Maximum performance measures 8 July 2011 2 Temperature Scale • For reversible cycles, Carnot showed for absolute temperatures Q T C =C TH QH rev cycle ME 200 • Absolute temperature scale is independent of the properties of the substance. 8 July 2011 3 Carnot efficiency Maximum performance measures (reversible processes) • Power cycles T η max = 1 − C TH • Refrigeration cycles ME 200 TH γ max = TH − TC TC β max = TH − TC • Heat pump cycles 8 July 2011 4 Example TC β max = TH − TC ME 200 QC β= Wcycle QC = 1500 kJ, Wcycle = 150 kJ. QC = 1400 kJ, QH = 1600 kJ. QH = 1600 kJ, Wcycle = 400 kJ. β = 5. Wcycle = QH − QC irreversible reversible impossible A refrigeration cycle operating between two reservoirs receives energy QC from the one at TC = 280 K and rejects energy QH to one at TH = 320 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or is impossible: – – – – 8 July 2011 5 Closure • In this lecture, we talked about: ME 200 – Temperature scales – Maximum performance measures 8 July 2011 6 Next Lecture • In the next lecture, we are going to talk about: ME 200 – Carnot Cycle – Clausius Inequality October 20th, 2010 7 ...
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Lecture 23 PES Su 2011 annotated - ME 200: Thermodynamics I...

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