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A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...

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Mechanical Engineering

A power plant operates on a regenerative vapor power cycle withone open feedwater heater. Steam enters the first turbine stage at12 MPa, 560°C and expands to 1 MPa, where some of the steam isextracted and diverted to the open feedwater heater operating at 1MPa. The remaining steam expands through the second turbine stageto the condenser pressure of 28 kPa. Saturated liquid exits theopen feedwater heater at 1 MPa. The net power output for the cycleis 330 MW. Assume that both turbine stages and both pumps have anisentropic efficiency of 75%.

Determine:

(a) the percent cycle thermal efficiency.

(b) the mass flow rate into the first turbine stage, inkg/s.

(c) the rate of entropy production in the open feedwater heater,in kW/K.

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