Optimal Selection of Cardinal Points of The Rankine Cycle

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Optimal Selection of Cardinal Points of The
Rankine Cycle

• By
• P M V Subbarao
• Mechanical Engineering Department
• I I T Delhi

Both Shape and Size are Important for Better
Performance !!!!
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Analysis of Cycle

• First law for a cycle

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Ideal Rankine Cycle
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Ideal Rankine Cycle P-h Diagram
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2
1
4
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Optimal Design of Vapour Power Plant
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Ideal Rankine Cycle P-h Diagram
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Ideal Rankine Cycle P-h Diagram
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Ideal Rankine Cycle P-h Diagram
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Ideal Rankine Cycle
T3 4500C
2s
P2 variable
T1 400C
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Selection of Optimum Boiler Pressure
Tmax 450 oC
h
Pressure, MPa
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Selection of Optimum Boiler Pressure
Tmax 450 oC
x
Pressure, MPa
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Selection of Optimum Boiler Pressure
Tmax 450 oC
xh
Pressure, MPa
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qin
wnet
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qin
wnet
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At a Given Maximum Temperature
h3
h4
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Qin
Wnet
Tc
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Analysis of Rankine Cycle Techno-economically
Feasible Thermodynamic Model
An appropriate selection of operational
parameters Processes
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Parametric Study of Rankine Cycle
h
P max
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Parametric Study of Rankine Cycle
w, kJ/kg
Pmax, MPa
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Parametric Study of Rankine Cycle
h
Tmax
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Parametric Study of Rankine Cycle
w, kJ/kg
Tmax, 0C
650
450
550
250
150
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Effect of inlet steam pressure (P) and condenser
pressure on Rankine efficiency with constant
inlet steam temperature of 470o C
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The Rankine Cycle
smin
smax
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Equivalent Carnot Model of Rankine Model

• Heat Addition in Steam Generator, qin
• Mean Effective Temperature of heat addition for
  equivalent isothermal process.

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Equivalent Carnot Model of Rankine Model

• Heat rejection in Steam Condenser, qin
• Mean Effective Temperature of heat rejection for
  equivalent isothermal process.

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Equivalent Carnot Model of Rankine Model
Tm,in
Tm,out
smin
smax
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Analysis of Equivalent Carnot Model

• Net work out put
• Heat Input

Efficiency,