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Lecture32_Isentropic efficiency-handout (1)

# Lecture32_Isentropic efficiency-handout (1) - 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 32 : Isentropic efficiency

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2 Outline Isentropic efficiency of Turbines/Nozzles/compressors And pumps Examples
3 Isentropic efficiency - Definition : comparison between idealized efficiency and actual efficiency - Identify the source or lower efficiency (irreversibilites) to maximize the actual efficiency. ideal real η °?±??²³´°µ η ¶µ??¶·

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4 Isentropic Turbine efficiency 0 = ° ±? − ? ±? + ² ݅ (? ݅ − ? ³ ) + (? ´ 2 −? µ 2 ) + ·(¸ ´ −¸ µ ) ? ±? ݅ = ? ݅ − ? ³ ¹ ; when Q is small Energy balance To get the maximum possible work output, enthalpy change should be maximized ( for given h i , need to get smallest h e )
5 Isentropic Turbine efficiency - using Mollier diagram s h p=const 1 2s 2 Actual expansion isentropic expansion (ideal) Since no Q, using 2 nd law ° ± = ² 2 − ² 1 ≥ 0 (=0 for no irreversibilities)

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Lecture32_Isentropic efficiency-handout (1) - ME200...

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