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Reheat Cycle: More close to Carnot Model

http://web.iitd.ac.in/~pmvs. Reheat Cycle: More close to Carnot Model . BY Dr. P M V Subbarao Mechanical Engineering Department I I T Delhi. More Obvious Improvement ……. Reheat Cycle. Analysis of Reheat Cycle. 1—2: Isentropic Pumping 2 –3 Constant (High)pressure Heat addition

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Reheat Cycle: More close to Carnot Model

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  1. http://web.iitd.ac.in/~pmvs Reheat Cycle: More close to Carnot Model BY Dr. P M V Subbarao Mechanical Engineering Department I I T Delhi More Obvious Improvement ……

  2. Reheat Cycle

  3. Analysis of Reheat Cycle • 1—2: Isentropic Pumping • 2 –3 Constant (High)pressure Heat addition • 3 –4 Isentropic expansion in HP turbine. • 4—5 Constant (Low) Pressure Reheating. • 5 – 6 Isentropic expansion in LP turbine. • 6 – 1 Constant pressure condensation.

  4. Analysis of Reheat Cycle • Consider reheat cycle as a combination of Rankine cycle and horn cycle. • Cycle 1-2-3-4-5-6-1 = Cycle 1-2-3-4-4’-1 + Cycle 4’-4-5-6-4’. • Therefore, 4’ 6

  5. Optimization of Reheat Cycle QRH,in wRH,net

  6. wlp whp

  7. Select appropriate reheat pressure, pRH, such that left hand side is maximum.

  8. Horn Cycle: 4’ – 4 Isentropic Compression. 4 – 5 Isobaric Heat Addition. 5 – 6 Isentropic Expansion 6 – 4’ Isobaric(thermal) cooling. 4’ 6

  9. Procedure to Determine Optimum Reheat Pressure • Calculate the efficiency of Rankine cycle, hRankine. • Calculate mean effective temperature of heat addition, Tm,in using • Find out pressure corresponding to Tm,in and entropy at HP turbine exit. • Add reheating at this pressure and calculate efficiency of the Reheat Cycle. • Repeat above steps for few iterations.

  10. Reassessment Thru Carnot Model 4500C 3110C ~2500C ~2730C

  11. h3

  12. 4 3 5 T 2 6 1 7 s

  13. Ideal Regenerative Cycle 4 5 6 7 3 2 1

  14. 4 5 5 T 4 6 3 2 1 7 S

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