For the same maximum temperature in the cycle, the average temperature of heat addition of a Rankine cycle compared to that of Carnot cycle is :
Same
Not related
Higher
Lower
Lower
In the Rankine cycle, the mean temperature at which heat is supplied is less than the maximum temperatureT₂, so that the efficiency is less than that of a Carnot cycle working between the same maximum and minimum temperatures.
The heat absorption takes place at constant pressure over eab, but only the part ab is isothermal.
The heat rejected occurs over cd, this is at both constant temperature and pressure.
p-V diagram :
T-S diagram :
h-S diagram :
Hence, the correct option is (D).
&Key Points:-
Heat addition process of Rankine cycle is reversible isobaric whereas heat addition process of Carnot cycle is reversible isothermal.
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