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Steam enters an industrial isentropic steam turbine at 3 MPa, and 7 percent steam at 500 kPa is redirected to a heat exchanger to preheat the feed water with the turbine's second outlet. The leftover steam travels to the condenser at a pressure of 100 kPa and a temperature of 200°C (Figure Q3). Consider the mass flow rate of steam in Table Q3 in relation to your last ID. Number in your calculations. (a) Calculate the turbine's power output in kW using 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 turbine 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 that is disepated in the condensor?

Steam enters an industrial isentropic steam turbine at 3 MPa, and 7 percent steam at 500 kPa is redirected to a heat exchanger to preheat the feed water with the turbine's second outlet. The leftover steam travels to the condenser at a pressure of 100 kPa and a temperature of 200°C (Figure Q3). Consider the mass flow rate of steam in Table Q3 in relation to your last ID. Number in your calculations. (a) Calculate the turbine's power output in kW using 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 turbine 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 that is disepated in the condensor?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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High pressure steam З МРа 1 Power Out Turbine Medium/low pressure steam To process 100 КРа 200°C 500 КРа Condenser 3 Figure Q3. Table Q3. Mass flowrate of steam Last ID. Number Mass flowrate of steam (kg/s) 0, 1 2, 3 6. 4, 5 7 6, 7 8 8, 9 9
Transcribed Image Text:High pressure steam З МРа 1 Power Out Turbine Medium/low pressure steam To process 100 КРа 200°C 500 КРа Condenser 3 Figure Q3. Table Q3. Mass flowrate of steam Last ID. Number Mass flowrate of steam (kg/s) 0, 1 2, 3 6. 4, 5 7 6, 7 8 8, 9 9
Q3. Steam enters an industrial isentropic steam turbine at 3 MPa, and 7 percent steam at 500 kPa is redirected to a heat exchanger to preheat the feed water with the turbine's second outlet. The leftover steam travels to the condenser at a pressure of 100 kPa and a temperature of 200°C (Figure Q3). Consider the mass flow rate of steam in Table Q3 in relation to your last ID. Number in your calculations. (а) Calculate the turbine's power output in kW using 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 turbine 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 that is disepated in the condensor?
Transcribed Image Text:Q3. Steam enters an industrial isentropic steam turbine at 3 MPa, and 7 percent steam at 500 kPa is redirected to a heat exchanger to preheat the feed water with the turbine's second outlet. The leftover steam travels to the condenser at a pressure of 100 kPa and a temperature of 200°C (Figure Q3). Consider the mass flow rate of steam in Table Q3 in relation to your last ID. Number in your calculations. (а) Calculate the turbine's power output in kW using 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 turbine 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 that is disepated in the condensor?
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