Lecture23_Temperature scales maximum performance measures-handout

# Lecture23_Temperature scales maximum performance measures-handout

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : [email protected] Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 23 : Temperature scales & maximum performance measures

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2 Outline The Kelvin and temperature scales Maximum performance measures for cycles operating Between Two thermal reservoirs Examples
3 Kelvin scales From the Carnot corollary: Hot reservoir System A Cold reservoir Q Q W ° ? Hot reservoir System B Cold reservoir Q Q W ° ? = = =

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4 Kelvin scales η = 1 − ° ?±? ° ²³ Can argue that efficiency for the reversible cycle is the function of (T H , T C ) From the Carnot corollary: All reversible power cycles with the same two thermal reservoirs have the same ´ (Regardless of substance making up the system (air, steam etc)) -> Temperature is the important factor ° µ ° ¶·¸ =
5 Kelvin scales In Kelvin scale, the ratio of temperature is equal to the amount of heat transfer for an reversible cycle. Define a Kelvin scales as : ° ± ° ²³´

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6 Maximum performance measures For power cycles η °±² = ³ ´µ´¶· ¸ ¹?
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Lecture23_Temperature scales maximum performance measures-handout

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