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A steam power plant operates on a regenerative Rankine cycle with two feedwater heaters, one closed...

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Mechanical Engineering

A steam power plant operates on a regenerative Rankinecycle with two feedwater heaters, one closed and one open. Steamenters the turbine at 12.5 MPa and 550ºC and exhausts to thecondenser at 10 kPa. Steam is extracted from the turbine at 1 MPafor the closed feedwater heater and 0.8 MPa for the open one. Thefeedwater is heated to the condensation temperature of theextracted steam in the closed feedwater heater. The extracted steamleaves the closed feedwater heater as a saturated liquid, which issubsequently throttled to the open feedwater heater. Show the cycleon a T-s diagram with respect to saturation lines, anddetermine(a) the mass flow rate of steam through theboiler for a net power output of 350 MW and (b) thethermal efficiency of the cycle.

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