Superheated steam (s. fig. C) at a pressure of 300 bar and a temperature of 550 ℃ enters a turbine made up of two stages. Steam exits the first stage of the turbine at 35 bar and gets reheated at a constant pressure at 550 ℃. Each stage of the turbine has an isentropic efficiency of 80%. The isentropic efficiency of the pump is 85%. The pressure of the condenser is 10 kPa. (a) Sketch the cycle in a T-s diagram and calculate the enthalpy at each point of the cycle. (b) Calculate the flow rate of the working fluid if the power output of the turbine is 100 MW. (c) Calculate the thermal efficiency of the cycle. (d) Double check the result for the heat rejected in the condenser.
Superheated steam (s. fig. C) at a pressure of 300 bar and a temperature of 550 ℃ enters a turbine made up of two stages. Steam exits the first stage of the turbine at 35 bar and gets reheated at a constant pressure at 550 ℃. Each stage of the turbine has an isentropic efficiency of 80%. The isentropic efficiency of the pump is 85%. The pressure of the condenser is 10 kPa.
(a) Sketch the cycle in a T-s diagram and calculate the enthalpy at each point of the cycle.
(b) Calculate the flow rate of the working fluid if the power output of the turbine is 100 MW.
(c) Calculate the thermal efficiency of the cycle.
(d) Double check the result for the heat rejected in the condenser.
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