The main difference between that Rankine Cycle and the Carnot Cycle is that heat transfer across the system boundary of Carnot Cycle is isothermal (constant temperature), and heat transfer across the system boundary in a Rankine cycle is isobaric (constant pressure). The Rankine cycle is a better model for most real systems because a constant pressure heat exchanger is a better approximation for how heat transfer is accomplished in most real systems than than heat transfer to/from constant temperature 'heat reservoirs.'.... IF YOU LIKE MY POST THEN CLICK A LIKE .. BEST OF LUCK :-)