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SpecialProblems38-40

# SpecialProblems38-40 - Special Problems for ME 200 Fall...

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Special Problems for ME 200 – Fall 2011 Special Problems 38, 39, and 40 Due Friday, December 9, 2011 SP38: Consider a new piston-cylinder engine cycle that can be modeled as a cold air-standard cycle with the following four internally reversible processes. Process 1-2: Reversible, isothermal compression Process 2-3: Constant volume heat addition Process 3-4: Reversible, adiabatic expansion Process 4-1: Constant volume heat rejection At the start of compression, air is at 100 kPa and 300 K (state 1). The maximum temperature in the cycle is 1500 K. The maximum and minimum cylinder volumes are 0.01 m 3 and 0.001 m 3 , respectively. (a) Show the cycle on P-v and T-s diagrams. Label the states, show pressure and temperature values, and appropriate lines of constant temperature and pressure. (b) Determine pressure (kPa) and temperature (K) at states 2, 3, and 4. (c) Calculate the compression work (kJ) per cycle. (d) What is the thermal efficiency (%) of the cycle?

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SpecialProblems38-40 - Special Problems for ME 200 Fall...

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