The heat input to the diesel cycle is nearest:
The pressure and temperature at the inlet to an ideal diesel cycle, with P-v diagram shown, are 100 kPa and 10ºC. It has a compression ratio of 18 and a cut-off ratio of 2. The maximum temperature in the cycle is 1400ºC. Assume constant
specific heats from Table below for all calculations.
A) 775 kJ/kg
B) 800 kJ/kg
C) 825 kJ/kg
D) 850 kJ/kg
A) 775 kJ/kg
A constant-pressure process occurs between states 2 and 3. The maximum temperature occurs at state 3 so the heat transfer, for this constant-pressure process, is
qin = h3 ? h2 =Cp(T3 ?T2 ) =1.0×(1673?899) = 774 kJ/kg
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