Question

10) An air-standard Otto cycle has a compression ratio of 9. At the beginning of the compression process, the temperature is 20°C, and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine the cycle efficiency, work output, and the heat rejected.

11)An air-standard Otto cycle operates with a minimum temperature of 300 K and a maximum temperature of 1700 K. The compression ratio of the cycle is 7. At the beginning of the compression process, the pressure is 105 kPa. Calculate P, V, and T at each point in the cycle, the mean effective pressure, and the thermal efficiency of the cycle.

12)An air-standard Diesel cycle has a compression ratio of 22

    and a cut-off ratio of 2.2. Determine the thermal efficiency of

    the cycle.

13)An air-standard Diesel engine has 1000 kJ/kg added as heat.

    At the beginning of the compression, the temperature is

    20°C, and the pressure is 150 kPa. If the compression ratio is

    20, determine the maximum pressure and temperature in

    the cycle.

14)An ideal Stirling engine using air as the working fluid

     operates between temperature limits of 300 and 2000 K.

     Determine the thermal efficiency of the cycle.

15) Consider an ideal Ericsson cycle with air as the working

     fluid executed in a steady-flow system. Air is at 270C and

     120 kPa at the beginning of the isothermal compression

     process, during which 150 kJ/kg of heat is rejected. Heat

     transfer to air occurs at 1200 K. Determine the thermal

     efficiency of the cycle and net work output per unit mass of

     air.

Answer 1