At 3 MPa, steam enters an industrial isentropic steam turbine, and 7% steam at 500 kPa is transferred to a heat exchanger to preheat the feed water through the turbine's second exit. At a pressure of 100 kPa and a temperature of 200°C, the residual steam passes to the condenser .figure (a) Calculate the turbine's power output in kW after stating the necessary assumptions. (b) Describe the conditions under which a turbine can operate in an isentropic state. Compare the power output of a real turbine with an isentropic turbine intuitively. (c) Due to irreversibility, the entropy of a real turbine process grows. To keep the entropy of the steam at a low value when it leaves the turbine, it is recommended that some heat be extracted from the steam via cold water circulation before it leaves the turbine. This will keep the entropy at a low value when the steam leaves the turbine, and thus the work output will increase. How do you rate this suggestion for boosting the turbine's efficiency? (d) Discuss the key processes of a steam power plant and the system's mechanical components. Also, why isn't the steam from the turbine directly sent into the boiler and save the thermal energy which is disepated in the condensor? Mass flowrate of steem (Kg/s)= 10
At 3 MPa, steam enters an industrial isentropic steam turbine, and 7% steam at 500 kPa is transferred to a heat exchanger to preheat the feed water through the turbine's second exit. At a pressure of 100 kPa and a temperature of 200°C, the residual steam passes to the condenser .figure
(a) Calculate the turbine's power output in kW after stating the necessary assumptions.
(b) Describe the conditions under which a turbine can operate in an isentropic state. Compare the power output of a real turbine with an isentropic turbine intuitively.
(c) Due to irreversibility, the entropy of a real turbine process grows. To keep the entropy of the steam at a low value when it leaves the turbine, it is recommended that some heat be extracted from the steam via cold water circulation before it leaves the turbine. This will keep the entropy at a low value when the steam leaves the turbine, and thus the work output will increase. How do you rate this suggestion for boosting the turbine's efficiency?
(d) Discuss the key processes of a steam power plant and the system's
Mass flowrate of steem (Kg/s)= 10
Step by step
Solved in 2 steps with 2 images
