Lecture25_Entropy-handout

Lecture25_Entropy-handout - ME200 : Thermodynamics I...

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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 : ebae@purdue.edu Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 25 : Entropy as a property
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2 Outline Entropy Retrieving Entropy Examples
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3 1 st and 2 nd Law of Thermodynamics 1 st Law of Thermodynamics: Total quantity of the system remains constant - conservation of energy - Energy can be converted to different forms but the summation remains the same - Doesn’t consider usefulness of the energy (just budgeting in and outs) W=100 kJ
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4 1 st and 2 nd Law of Thermodynamics 2 nd Law of Thermodynamics: Quality of energy is degraded irreversibly - Some energy (i.e. electrical energy) can be completely changed into heat but the reverse cannot be achieved without outside help or loss of energy (some irretrievable heat; energy is not destroyed; it’s just become unavailable for producing work) - Defines direction of the process, maximum achievable efficiency, etc -
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Lecture25_Entropy-handout - ME200 : Thermodynamics I...

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