Question

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

open feedwater heater. Steam enters the first turbine at 12.0 MPa, 520C and expands to 0.6 MPa. The steam is

reheated to 480C before entering the second turbine, where it expands to the condenser pressure of 0.006 MPa.

Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the

closed heater at 205C and 8.0 MPa, and condensate exits as saturated liquid at 2 MPa. The condensate is trapped

into the open feedwater heater. Steam extracted from the second turbine at 0.3 MPa is also fed into the open

feedwater heater, which operates at 0.3 MPa. The stream exiting the open feedwater heater is saturated liquid

at 0.3 MPa. The net power output of the cycle is 100 MW. There is no stray heat transfer from any component

to its surroundings. If the working fluid experiences no irreversibilities as it passes through the turbines, pumps,

steam generator, reheater, and condenser, determine (a) the thermal efficiency, (b) the mass flow rate of the

steam entering the first turbine, in kg/h. (Turbine and pump isentropic efficiencies 100% & Create a table of all values)

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