1 / 14

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.

hana
Download Presentation

Further Developments in Carnotization of Rankine Model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related