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Analysis of Rankine Cycle with FWH

Analysis of Rankine Cycle with FWH. P M V Subbarao Professor Mechanical Engineering Department I I T Delhi. Engineering solution to Pure Thoughts ..…. Regeneration Cycle with Open FWH. Analysis of OFWH. h 6. y. h 2. 1-y. h 3. Conservation of energy:.

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Analysis of Rankine Cycle with FWH

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  1. Analysis of Rankine Cycle with FWH P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Engineering solution to Pure Thoughts ..…..

  2. Regeneration Cycle with Open FWH

  3. Analysis of OFWH h6 y h2 1-y h3 Conservation of energy:

  4. Haywood MethodologyAnalysis of Engineering Cycles : R.W. Haywood PB

  5. Assumptions : • The Difference between local steam enthalpy and enthalpy of saturated water at the same pressure is constant throughout the expansion. • Constant ‘β’ Assumption by Haywood. By assuming that the turbine expansion line follows a path on the diagram such that the (h-hf)=constant= β Where, h- local enthalpy on the turbine expansion line at a given pressure. hf=Enthalpy of saturated water at that pressure .

  6. 4f Let the enthalpy rise of feed water in the heater is g.

  7. 4f Maximum irreversibility to be eliminated = The total enthalpy rise of feed water = h4f – h1 Let

  8. 4f Pump work input is negligible

  9. There fore the efficiency can be written as Here β and α are fixed and g is variable. So, there is an optimum value of γ for which η is a maximum. On differentiation, There fore g = α / 2 The cycle efficiency is maximum when the total enthalpy rise of feed water (h4f – h1) from the condenser temperature to the boiler saturation temperature is divided equally between the feed water heater and the economizer ( i.e. h4f – h4 = h3 – h2) in a single bleed cycle.

  10. So the temperature rise in the feed water heater is ΔT = ½ ( Tboiler saturation – T condenser) And the corresponding cycle efficiency is For a non-regenerative cycle,

  11. The maximum gain in efficiency due to regeneration This is positive. This shows that the cycle efficiency has improved due to regeneration.

  12. Location of Haywood’s Optimum OFWH h6 y h2 1-y h3

  13. Analysis of Regeneration through OFWH

  14. Analysis of Bleed Steam Performance pbleed, MPa

  15. Analysis of Condensing Steam Performance pbleed, MPa

  16. Comparison of Performance of Bleed & Condensing steams hcond hbleed Pregen, MPa

  17. Performance of FWH Cycle ~ 12MPa htotal pregen, MPa

  18. Performance of bleed Steam ~ 2 Mpa hbleed pregen, MPa

  19. Workoutput of bleed Steam ~ 12MPa wbleed pregen, MPa

  20. Workoutput of bleed Steam Fractional specific output Fraction of Bleed Steam

  21. Workoutput of bleed Steam wbleed

  22. Progress in Rankine Cycle

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