Q3. A theoretical engine cycle consists of the following four sequential processes:
Compression according to the law pV1.28 from the initial conditions
Constant volume heat addition
Expansion according to the law pV1.33 to the initial volume
Constant volume heat rejection to the initial temperature.
The initial pressure and temperature are 1 bar and 43ºC.
The volume compression ratio is 13:1.
The heat addition is 1200 kJ/kg of working fluid.
The working fluid has the properties of air throughout.
(a) Sketch the cycle on Pressure-Volume and Temperature-specific entropy diagrams.
(b) Calculate EACH of the following:
(i) The heat transfer during the compression process
(ii) The heat transfer during the expansion process
(iii) The cycle efficiency.
Note: for air Cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK
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