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SpecialProblems22-24

# SpecialProblems22-24 - rest to a reservoir at 300 K If the...

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Special Problems for ME 200 - Spring 2011 Special Problems 22, 23 & 24 Due March 21, 2011 SP22: A reversible power cycle has a thermal efficiency of 65%. The waste heat from the cycle is rejected to a thermal reservoir at 55°F at a rate of 750 BTU/min. Determine a) the power output of the engine (BTU/min) b) the temperature of the source (°F) SP23: Consider two Carnot heat engines operating in series. The first engine receives heat from a reservoir at 1900 K and rejects the waste heat to a reservoir at temperature T. The second engine receives the energy rejected by the first one, converts some of it to work, and rejects the
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Unformatted text preview: rest to a reservoir at 300 K. If the thermal efficiency of the second heat engine is 20% less than the thermal efficiency of the first heat engine, determine the temperature T (K). SP24: Consider a Carnot cycle for water in a piston-cylinder device. The mass of the water is 1.5 kg. During the isothermal expansion the water is heated from a quality of 0.2 at a pressure of 25 bar to the saturated vapor state. The vapor then expands adiabatically to a pressure of 0.9 bar and a quality of 0.8. a) Sketch the P-v diagram for this cycle b) Evaluate the heat and work for each process (kJ) c) Evaluate the thermal efficiency...
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