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Unformatted text preview: 9/11/2010 1 Energy Analysis of Cycles Energy Analysis of Cycles ME 200 Thermodynamics I Glove Box Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 8 September 10 th , 2010 Mbraun Glove Box Manual Lecture Outline Lecture Outline • Last lecture: Introduced the first law of thermodynamics (energy balances) for Closed Systems • This lecture: Apply energy analysis to thermodynamic cycles ME 200 ME 200 2 Acknowledgement: Dr. E. A. Groll for slides 9/11/2010 2 What is a What is a Thermodynamic Thermodynamic Cycle? Cycle? • Cycle: When a system at a given initial state goes through a sequence of processes and finally returns to that state, the system has executed a thermodynamic cycle executed a thermodynamic cycle. • Practical Applications: – Power generation – Vehicle transportation – Refrigeration, AC, HP ME 200 ME 200 3 • Note: A cycle is considered a closed system if there is no mass entering or leaving the system boundary! Energy Analysis of Cycles Energy Analysis of Cycles Process 2 CM Q W Process 1 Process … Q W Q W ME 200 ME 200 4 Process n Q W 9/11/2010 3 • For a finite cyclic process (one time around): Energy Analysis of Cycles Energy Analysis of Cycles CM E Q W E • Note: – Since the system is returned to its initial state after one cycle is completed, there is no net change in system energy! cycle cycle cycle E Q W ME 200 ME 200 5 • For a cycle at steady ‐ state: cycle dE dt cycle cycle Q W Q W • We will consider two general classes of cycles: Energy Analysis of Cycles Energy Analysis of Cycles 1. Power Cycle / Heat Engine 2. Refrigeration Cycle / Heat Pump ME 200 ME 200 6 Main Purpose: Heat in (e.g., through burning of fuel) to generate power out...
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This note was uploaded on 09/19/2010 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University.
 Spring '08
 GAL

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