the rankine cycle improvements
TRANSCRIPT
https://www.youtube.com/watch?v=2IKECt4Y3RI
The Rankine Cycle Improvements
Rankine Cycle Rankine Cycle with Superheat Notes 1. The larger average temperature at which heat is added in a Superheat Rankine cycle results in a larger
efficiency as compared to an ordinary Rankine cycle.
s
T
1
2s 3
4s
a
p4s = pa = p1 = constant
p2s = p3 = constant < p4
s
1
2s 3
4s
a
p4s = p4 = pa = p1 = constant
p2s = p2 = p3 = constant < p4
2
4
T
Rankine Cycle with Reheat
Notes 1. The larger average temperature at which heat is added in a Reheat Rankine cycle results in a larger
efficiency as compared to an ordinary Rankine cycle. 2. The 1st stage turbine typically exits in the SHV phase (State 2). In addition, the quality at the exit of
the 2nd stage turbine (State 4) is larger than that in an ordinary Rankine cycle.
s
T
1
2s
5
6s
a
p6s = pa = p1 = constant
p4s = p5 = constant < p3 < p1
3
4s
p2s = p3 = constant < p1
Rankine Cycle with Supercritical Reheat Notes 1. The larger average temperature at which heat is added in a Supercritical Rankine cycle results in a
larger efficiency as compared to an ordinary Rankine cycle. 2. The 1st stage turbine typically exits in the SHV phase (State 2). In addition, the quality at the exit of
the 2nd stage turbine (State 4) is larger than that in an ordinary Rankine cycle. 3. The large pressures and temperatures in a Supercritical Rankine cycle requires the use of high pressure
piping and steam generator, and turbine materials that can withstand high temperatures. 4. Efficiencies up to 47% can be achieved in a Supercritical Rankine cycle power plant.
s
T
1
2s
5
6s
p2s = p3 = constant
p4s = p5 = constant < p3
3
4s