If one mole of air/fuel mixture (rigid diatomic gas) is initially at 20 °C, is compressed and expanded 7-fold as part of the Otto cycle, and 4 kJ of heat is generated by burning the air/fuel mixture, calculate: (i) the temperature after each stage of the Otto cycle; (ii) the heat absorbed/expelled during each stage of the cycle; and (iii) the efficiency of the Otto cycle.

Air enters the compressor of a regenerative air-standard Brayton cycle at 14 lbf/in2, 520◦R. The compressor pressure ratio is 14 and the turbine inlet temperature is 2500◦R. The compressor and turbine have isentropic efficiencies of 83 and 87 %, respectively. The net power developed is 5×106Btu/h. For regenerator effectiveness values ranging from 0 to 100% plot (a) the thermal efficiency. (b) the percent decrease in heat addition to the air.

Determine the temperatures and pressures at all stages of an ideal air-standard SI Otto cycle analysis

In a Diesel cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.85 L. The displaced volume of the cycle is 0.78 L, the temperature at the end of the compression process is 690 K, the pressure at the end of the expansion process is 2.32 bar, the specific heat ratio is =1.32, the specific heat at constant volume Cv = 0.75 kJ/kg.K and the gas constant is 287 J/kg.K for air. The compression ratio is: Choose. The specific heat at constant pressure in kJ/kg.K is: Choose. The maximum temperature of the cycle in K is: Choose. The temperature at the end of the expansion process of the cycle in K is: Choose.. the heat rejected in kJ/kg of air is: Choose.