Lecture21_2nd law irreversibilities-handout

# Lecture21_2nd law irreversibilities-handout - ME200...

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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 21 : Introduction to the 2 nd law, irreversibilities

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2 2 nd law of thermodynamics Irreversibilites Examples
3 0 th Law of Thermodynamics 0 th law of thermodynamics 45 ° C 45 ° C ? A B C

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4 1 st Law of Thermodynamics - First law of thermodynamics : Energy is conserved! ?°± amount of energy transferred ²? by heat transfer ?°± amount of energy transferred ?³± by work = change in the energy stored within a system Energy in (Q) Energy out (W) Energy stored (U) ´ − µ = Δ¶ + Δ· E PE Energy balance for closed system Sign convention Of W and Q
5 2 nd Law of thermodynamics Motivation By experience we know the of Q

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6 2 nd Law of thermodynamics Motivation When P inside a contain is higher than P atm Naturally we know that water temp does not increase by itself
7 2 nd Law of thermodynamics Motivation By experience we know Q is generated when work W is given via a pedal Naturally we know that transferring heat to the pedal will not rotate to generate

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8 2 nd Law of thermodynamics Motivation : Power cycle :- Can η>100 ? What is the max efficiency?
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## This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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Lecture21_2nd law irreversibilities-handout - ME200...

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