1. Analysis of Constant Pressure Steam Generation
P M V Subbarao
Professor
Mechanical Engineering Department
Identification of Right Avenues …..

2. 2 – 3 : SG: Isobaric Heating : p3 = p2
QCV 3 2
No work transfer, change in kinetic and potential energies are negligible
Assuming a single fluid entering and leaving…

3. Constant Pressure Heating Process

4. The Power Gods W J M Rankine ~ 1860 ~1820 : Sadi Carnot =0
Constant Pressure Heat Addition:

5. Analysis of Constant Pressure Steam Generation
Specific
Pressure
Enthalpy
Entropy
Temp
Volume
MPa
kJ/kg
kJ/kg/K C
m3/kg 1
3500
7.79
509.9
0.3588 2 5
7.06
528.4 3 10
6.755
549.6 4 15
6.582
569 20
6.461
586.7 6 25
6.37
602.9 7 30
6.297
617.7 8 35
6.235
631.3
0.0102

6. Constant Pressure Heating Process
Vapour
Liquid +Vapour h
Liquid s

7. Constant Pressure Heating Process

8. Behavior of Fluid At Increasing Pressures
All these show that the sensitivity of the fluid increases with increasing pressure.

9. Ideal Rankine Cycle

10. Ideal Rankine Cycle : p-h Diagram3 2 1 4

11. Ideal Rankine Cycle : P-h Diagram1 2 3 4 1 2 3 4 1 2 3 4

12. Analysis of Steam Generation Process
Heat Addition in Steam Generator, qin
Define entropy based mean

14. Ideal Rankine Cycle : P-h Diagram
Tmax=5500C
pmax=17Mpa
Tmean=284.40C 1 2 3 4 1 2 3 4
pmax=5Mpa
Tmean=246.30C

15. Turbine : Isentropic Process :s4=s3
No heat transfer. Change in kinetic and potential energies are negligible
Assuming a single fluid entering and leaving…

16. 4 – 1 : Condenser : Isobaric Cooling : p4 = p1
QCV 4 1
No work transfer, change in kinetic and potential energies are negligible
Assuming a single fluid entering and leaving…

17. Analysis of Cycle
First law for a cycle:

19. The Rankine Cycle
smin
smax

20. Ideal Rankine Cycle : P-h Diagram
Tmax=5500C
pmax=17Mpa
h=42.05%
Tequi=284.40C 1 2 3 4 1 2 3 4
pmax=5Mpa
h=37.8%
Tequi=246.30C