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Question 1 An ideal Rankine cycle operates between the four states shown in the figure below: Boiler 8 MPa B 6 MPa 600°C W Turbine ? Pump x = 0 20 kPa ? Condenser A ? Qc Pump The mass flow rate of the steam is 25 kg/s. The cycle is referred to as "ideal" since all the components are assumed to operate with no losses. No losses in the turbine, pump, and connecting pipes are considered. a) Analyse the cycle and determine the cycle efficiency. b) An actual Rankine cycle is formed using the same properties presented above but with 85% efficient turbine and 80% efficient pump. The conditions on the boiler and condenser remain the same. Find the exiting state from the turbine and the pump; and the efficiency of the actual Rankine cycle.

          Question 1
An ideal Rankine cycle operates between the four states shown in the figure below:
Boiler
8 MPa
B
6 MPa
600°C
W
Turbine
?
Pump
x = 0
20 kPa
?
Condenser
A
?
Qc
Pump
The mass flow rate of the steam is 25 kg/s. The cycle is referred to as "ideal" since all the
components are assumed to operate with no losses. No losses in the turbine, pump, and
connecting pipes are considered.
a) Analyse the cycle and determine the cycle efficiency.
b) An actual Rankine cycle is formed using the same properties presented above but with
85% efficient turbine and 80% efficient pump. The conditions on the boiler and
condenser remain the same. Find the exiting state from the turbine and the pump; and
the efficiency of the actual Rankine cycle.

Question 1
An ideal Rankine cycle operates between the four states shown in the figure below:
Boiler
8 MPa
B
6 MPa
600°C
W
Turbine
?
Pump
x = 0
20 kPa
?
Condenser
A
?
Qc
Pump
The mass flow rate of the steam is 25 kg/s. The cycle is referred to as "ideal" since all the
components are assumed to operate with no losses. No losses in the turbine, pump, and
connecting pipes are considered.
a) Analyse the cycle and determine the cycle efficiency.
b) An actual Rankine cycle is formed using the same properties presented above but with
85% efficient turbine and 80% efficient pump. The conditions on the boiler and
condenser remain the same. Find the exiting state from the turbine and the pump; and
the efficiency of the actual Rankine cycle.

Added by Gregorio L.

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