Rankine Cycle:
Saturated or superheated steam enters the turbine at state 1, where it expands isentropically to the exir pressure at state 2. The steam is then condensed at constant pressure and temperature to a saturated liquid, state3. The heat removed from the steam in the condenser is typically transferred to the cooling water. The saturated liquid then flows through the pump which increase the pressure to the boiler pressure (state 4), where the water is first heated to the saturation temperature, boiled and typically superheated to state 1. Then whole cycle is repeated.
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