# Ps1 - MPa Some steam is extracted at this pressure to heat...

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PS 1 1) In a vapor power cycle, condition of the exhausted water from boiler is 4 MPa, 450°C, condition of entrance to the turbine is 3.8 MPa 425°C; the pressure of condenser is 7.5 kPa, pump exit pressure is 5.5 MPa, condition of entrance to the boiler is 5.2 MPa 35°C. If isentropic efficiencies of the pump and the turbine are 0.8 and 0.9, find the efficiency of the system. 2) A steam power plant operates on an ideal reheat regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 550°C and leaves at 0.8
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Unformatted text preview: MPa. Some steam is extracted at this pressure to heat the feedwater in a feedwater heater. The rest of the steam is reheated to 500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. Assume that the water leaves the heater at the condensation temperature of the extracted steam and that the extracted steam leaves the heater as a saturated liquid and is pumped to the line carrying the feedwater. Determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle....
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