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Further Developments in Carnotization of Rankine Model

Further Developments in Carnotization of Rankine Model. BY P M V Subbarao Professor Mechanical Engineering Department I I T Delhi. Taming of Non-Isothermal Heat Addition Zones…. Reassessment Thru Carnot Model. 450 0 C. 311 0 C. ~250 0 C. Reheat Cycle. Analysis of Reheat Cycle.

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Further Developments in Carnotization of Rankine Model

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  1. Further Developments in Carnotization of Rankine Model BY P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Taming of Non-Isothermal Heat Addition Zones…..

  2. Reassessment Thru Carnot Model 4500C 3110C ~2500C

  3. Reheat Cycle

  4. 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.

  5. 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

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

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

  8. pmax= 15 MPa Tmax= 550 0C Tsat= 342.20C

  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. pmax= 15 MPa Tmax= 550 0C Tsat= 342.20C

  11. Effect of Reheat Pressure Dh,% 1.0 0.2 0.4 0.6 0.8 ~0.3 prh/pmax

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