2. The Rankine Cycle: An Alternate Ideal Thermodynamic Model P M V Subbarao Professor Mechanical Engineering Department IIT Delhi A Feasible Mathematical Model for Power generation ….

3. How about a modified cycle - A Rankine cycle To avoid transporting and compressing two-phase fluid, try to condense all fluid exiting from the turbine into saturated liquid before compressed it by a pump. when the saturated vapor enters the turbine, its temperature and pressure decrease and liquid droplets will form by condensation. These droplets can produce significant damages to the turbine blades due to corrosion and impact. One possible solution: superheating the vapor. It can also increase the thermal efficiency of the cycle.

4. Ideal Rankine Cycle

5. The Rankine Cycle

6. Pump : Isentropic Process SSSF: Conservation of mass First Law : No heat transfer, change in kinetic and potential energies are negligible 1 2

7. 2 – 3 : Boiler: Isobaric Heating : p 3 = p 2 No work transfer, change in kinetic and potential energies are negligible 2 Q CV 3 Assuming a single fluid entering and leaving…

8. For reversible constant Pressure (including change of phase) Mean Effective Temperature of heat addition : Entropy averaged Temperature.

9. Turbine : Isentropic Process :s 4 =s 3 No heat transfer. Change in kinetic and potential energies are negligible 3 4 T Assuming a single fluid entering and leaving…

10. 4 – 1 : Condenser : Isobaric Cooling : p 4 = p 1 No work transfer, change in kinetic and potential energies are negligible 1 Q CV 4 Assuming a single fluid entering and leaving…

11. Analysis of Cycle First law for a cycle:

13. Analysis of Rankine Cycle: Techno-economically Feasible Thermodynamic Model  n appropriate selection of operational parameters & Processes P M V Subbarao Professor Mechanical Engineering Department

14. Optimal Design of Vapour Power Plant

15. p max =10MPa

19. Progress in Rankine Cycle Year 1907 19191938195019581959196619731975 MW52030601202005006601300 p,MPa1.31.44.16.210.316.215.9 24.1 T h o C260316454482538566 565538 T r o C-- 538 566565538 FHW--23466788 Pc,kPa13.55.14.53.43.7 4.45.45.1 ,% --~1727.630.535.637.539.839.540