SpecialProblems25-26

SpecialProblems25-26 - State Pressure Temperature Specific...

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Special Problems for ME 200 – Fall 2009 Special Problems 25 and 26 Due Friday, October 30, 2009 SP25: Two kilograms of water execute Carnot power cycle inside a piston-cylinder device. During isothermal expansion, water is heated from an initial state where its pressure is 40 bar and the quality is 15% (state 1) until its state is saturated vapor (state 2). The saturated vapor then expands adiabatically to a pressure of 1.5 bar (state 3) while 491.5 kJ/kg of work output is produced. Water is then isothermally compressed at 1.5 bar to state 4 and then via adiabatic compression back to state 1. (a) Complete the following table.
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Unformatted text preview: State Pressure Temperature Specific Volume Specific Internal Specific Enthalpy (bar) (C) (m3/kg) Energy (kJ/kg) (kJ/kg) 1 2 3 4 (b) Determine the heat transfer (kJ) and work (kJ) for each process. (c) What is the thermal efficiency of this cycle? (d) Show all the processes of the cycle on P-v diagram. SP26: A heat engine receives 2975 kJ/kg of heat at an average temperature of 450 C and rejects 1850 kJ/kg of heat at 47 C. (a) Is the Clausius inequality satisfied? Provide quantitative support for your answer. (b) Are the Carnot principles satisfied? Provide quantitative support for your answer....
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