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Superheated steam at 20 MPa, 640°C enters the turbine of a vapor power plant. The pressure...

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Mechanical Engineering

Superheated steam at 20 MPa, 640°C enters the turbine of a vaporpower plant. The pressure at the exit of the turbine is 0.5 bar,and liquid leaves the condenser at 0.4 bar at 75°C. The pressure isincreased to 20.1 MPa across the pump. The turbine and pump haveisentropic efficiencies of 81 and 85%, respectively. Cooling waterenters the condenser at 20°C with a mass flow rate of 70.7 kg/s andexits the condenser at 38°C. For the cycle, determine: (a) the massflow rate of steam, in kg/s. (b) the percent thermalefficiency.

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