Assignment10_14.pdf

# Assignment10_14.pdf - MME 3334b Assignment#10 1 Hot exhaust...

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MME 3334b Assignment #10 March 25, 2014 1. Hot exhaust gases leaving an internal combustion engine at 400 o C and 150 kPa at a rate of 0.8 kg/s is to be used to produce saturated steam at 200 o C in an insulated exchanger. Water enters the heat exchanger at the ambient temperature of 20 o C, and the exhaust gases leave the heat exchanger at 350 o C. Determine (a) the rate of steam production, (b) the rate of exergy destruction in the heat exchanger, and (c) the second-law efficiency of the heat exchanger. 2. A four-cylinder, four-stroke, 2.8-liter compression-ignition engine operates on the ideal dual cycle with a compression ratio of 14. The air is at 95 kPa and 55 o C at the beginning of the compression process and the engine speed is 3500 rpm. Equal amounts of fuel are burned at constant volume and at constant pressure. The maximum allowable pressure in the cycle is 9 MPa due to material strength limitations. Using constant specific heats at 850 K, determine (a) the maximum

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