a) A power plant is planned to be built for supporting a mining industry nearby. In order to reduce to amount of coal usage, it uses a regenerative cycle with one closed feedwater heater. The generated steam is passed through a turbine at an inlet pressure and temperature of 4 MPa and 700°C respectively. The steam expands in the turbine and exits at condenser pressure of 30 kPa. Some portion of the steam is taken for the regeneration process and this process takes place at pressure of 2 MPa. The regeneration process is conducted in closed type feedwater heater. The extracted steam leaves the heater as saturated liquid and it is throttled to the condenser pressure of 30 kPa. The water leaves condenser a saturated liquid before it is pumped back to boiler pressure of 4 MPa. i. ii. iii. iv. Show the cycle on a T-s diagram What is the quality of the steam at the exit of the turbine, x Calculate mass fraction of steam bled-off at 2 MPa, y Calculate the amount of heat rejected in the condenser, kJ/kg the thermal efficiency, %

a) A power plant is planned to be built for supporting a mining industry nearby. In order to reduce to amount of coal usage, it uses a regenerative cycle with one closed feedwater heater. The generated steam is passed through a turbine at an inlet pressure and temperature of 4 MPa and 700°C respectively. The steam expands in the turbine and exits at condenser pressure of 30 kPa. Some portion of the steam is taken for the regeneration process and this process takes place at pressure of 2 MPa. The regeneration process is conducted in closed type feedwater heater. The extracted steam leaves the heater as saturated liquid and it is throttled to the condenser pressure of 30 kPa. The water leaves condenser a saturated liquid before it is pumped back to boiler pressure of 4 MPa. i. ii. iii. iv. Show the cycle on a T-s diagram What is the quality of the steam at the exit of the turbine, x Calculate mass fraction of steam bled-off at 2 MPa, y Calculate the amount of heat rejected in the condenser, kJ/kg the thermal efficiency, %

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 3 MPa in the boiler and 30 kPa in the condenser. If the quality at the exit of the turbine cannot be less than 80 percent, what is the maximum thermal efficiency this cycle can have? Use steam tables. The maximum thermal efficiency is %.