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Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open...

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Mechanical Engineering

Consider a regenerative vapor power cycle with two feedwaterheaters, a closed one and an open one, and reheat. Steam enters thefirst turbine stage at 12 MPa, 560 °C, and expands to 1.5 MPa. Somesteam is extracted at 1.5 MPa and fed to the closed feedwaterheater. The remainder is reheated at 1.5 MPa to 440 °C and thenexpands through the second-stage turbine to 0.3 MPa, where anadditional amount is extracted and fed into the open feedwaterheater operating at 0.3 MPa. The steam expanding through thethird-stage turbine exits at the condenser pressure of 10 kPa.Feedwater leaves the closed heater at 220 °C, 10 MPa, andcondensate exiting as saturated liquid at 1.5 MPa is trapped intothe open feedwater heater. Saturated liquid at 0.3 MPa leaves theopen feedwater heater. Assume all pumps and turbine stages operateisentropically. Determine for the cycle:
      a) The rate of heat transfer to theworking fluid passing through the steam generator, in kJ per kg ofsteam entering the first-stage turbine.
      b) The thermal efficiency.
      c) The rate of heat transfer fromthe working fluid passing through the condenser to the coolingwater, in kJ per kg of steam entering the first-stage turbine.

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