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A four-stroke-cycle engine operates on the air-standard Diesel cycle. The engine has six cylinders with a 0.105 m bore and a 0.124 m stroke. The engine speed is 2000 rpm. At the beginning of compression, the air is at 0.93 bar and 24 C and the maximum temperature is 1950 C. If the clearance volume is 6% of the displacement volume, compute the compression ratio, the pressure [bars] and temperature [C] at the end of the compression process, the thermal efficiency, and the horsepower output of the engine. Also determine the efficiency and the horsepower output if the cutoff ratio is halved. Assume the air is an ideal gas with constant specific heats. Its specific heat ratio is 1.4 and gas constant is 0.287 kJ/kg- K.
If the final pressure is 1.0 MPa, determine (a) the temperature (°C) at the final state and (b) the heat transfer (kJ) during this process.
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