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  3. 4. consider a reheat–regenerative vapor pow

4. Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and...

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Mechanical Engineering

4. Consider a reheat–regenerative vapor power cycle with twofeedwater heaters, a closed feedwater heater and an open feedwaterheater. Steam enters the first turbine at 12.0 MPa, 520C andexpands to 0.6 MPa. The steam is reheated to 440C before enteringthe second turbine, where it expands to the condenser pressure of0.006 MPa. Steam is extracted from the first turbine at 2 MPa andfed to the closed feedwater heater. Feedwater leaves the closedheater at 200C and 8.0 MPa, and condensate exits as saturatedliquid at 2 MPa. The condensate is trapped into the open feedwaterheater. Steam extracted from the second turbine at 0.4 MPa is alsofed into the open feedwater heater, which operates at 0.3 MPa. Thestream exiting the open feedwater heater is saturated liquid at 0.3MPa. The net power output of the cycle is 100 MW. There is no strayheat transfer from any component to its surroundings. If theworking fluid experiences no irreversibilities as it passes throughthe turbines, pumps, steam generator, reheater, and condenser,determine (a) the thermal efficiency, (b) the mass flow rate of thesteam entering the first turbine, in kg/h. (Turbine andpump isentropic efficiencies 100% & Create a table of allvalues)

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