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ME300Lecture07

ME300Lecture07 - Lecture 7 Exergy Analysis Note All...

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Lecture 7: Exergy Analysis Note: All previous analyses considered the isentropic process as the goal to strive for. Maximize adiabatic and isentropic efficiency Thi h i h t i ht d f th This approach is short sighted for three reasons: 1. It ignores processes where heat transfer is present. (The majority of all practical processes.) 2. It assumes that reversibility can be obtained: Not possible! 3 It th t th it t t f d i “fl t” 3. It assumes that the exit state of a device can “float”, i.e., cases where the exit pressure is fixed, but the exit temperature is allowed to fall below the temperature of th di N t ibl ! 7.1 the surroundings: Not possible!
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Continue Exergy Analysis Need different approach for thermodynamic analysis: Exergy Analysis Notes: » It can be used for both adiabatic and non-adiabatic processes. » It shows how close a device operating between two fixed end states is to its optimum performance. » It identifies the system components most responsible for » It identifies the system components most responsible for sub-optimum system performance. 7.2
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