Chapter 8, Problem 8.39P

An ideal Reheat-Regenerative engine operates with a boiler pressure of 8 MPa and a condenser pressure of 8 kPa. Throttle steam at 8 MPa, 480°C is expanded in the turbine to 2 MPa where it is withdrawn from the turbine and reheated to 460°C. The reheated steam then expands in the turbine to 300 kPa where a portion of the steam is extracted for feedwater heating in an open heater. The remainder of the steam continues its expansion to the condenser pressure of 8 kPa. Removing the reheater while retaining the feedwater heater,  what is the: % of mass extracted? turbine work in kJ/kg? thermal efficiency?  energy chargeable against the engine in kJ/kg?

An ideal Reheat-Regenerative engine operates with a boiler pressure of 8 MPa and a condenser pressure of 8 kPa. Throttle steam at 8 MPa, 480°C is expanded in the turbine to 2 MPa where it is withdrawn from the turbine and reheated to 460°C. The reheated steam then expands in the turbine to 300 kPa where a portion of the steam is extracted for feedwater heating in an open heater. The remainder of the steam continues its expansion to the condenser pressure of 8 kPa. What is the: turbine Work in kJ/kg? % of mass extracted for feedwater heating? thermal efficiency? energy chargeable against the engine in kJ/kg?

4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate mankan kunne tħe b) net power output, in MW