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SP39-43

# SP39-43 - ME300 Spring 2011 Special Problems SP39 Consider...

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1 ME300 Spring 2011 - Special Problems SP39 Consider an engine operating on the ideal Otto cycle with air as the working fluid. Compression and expansion processes are both isentropic, and the heat addition and rejection processes are internally reversible. At the beginning of the compression process, the air is at 17 °C and 1 bar and the volume of the cylinder is 504 cm 3 . At the end of the compression process, the volume is 50 cm 3 . The temperature is 1000 K after the heat-addition process. Do not assume constant specific heats. Do not interpolate in the table, use the closest value(s). The environmental temperature and pressure are T o = 290 K, p o = 1 bar. Determine: a) Draw a T-s diagram for the cycle b) The pressure at the beginning of the heat-addition process c) The heat added, in kJ d) The exergy added with the heat from 2 to 3, in kJ 8.314 / 0.287 / R kJ kmol K R kJ kg K State V [cm 3 ] P [bar] T [K] u[kJ/kg] v r s o 1 504 1.0 290 2 50 3 50 1000 4 504 Answers: (b) 24.7 bar, (c) 0.143 kJ, (d) 0.094 kJ SP40 An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 80

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