2. Consider a regenerative vapor power cycle with one open feedwater heater. Steam enters the turbine at 8.0 MPa, 480°C and expands to 0.7 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 0.7 MPa. The remaining steam expands through the second-stage turbine to the condenser pressure of 0.008 MPa. Saturated liquid exits the open feedwater heater at 0.7 MPa. The isentropic efficiency of each turbine stage is 85% and each pump operates isentropically. If the net power output of the cycle is 100 MW, determine (a) the thermal efficiency and (b) the mass flow rate of steam entering the first turbine stage, in kg/h.

An ideal reheat Rankine cycle with water as the working fluid operates the inlet of the high-pressure turbine at 7000 kPa and 450°C, the inlet of the low-pressure turbine at 500 kPa and 500°C, and the condenser at 10 kPa. Determine the mass flow rate through the boiler needed for this system to produce a net 5000 kW of power and the thermal efficiency of the cycle. Use steam tables. kg/s. The mass flow rate through the boiler needed for this system to produce a net 5000 kW of power is The thermal efficiency is %.

An ideal regenerative steam power cycle operates with steam that enters the turbine at 30 bars and 500°C and leaves the condenser as a saturated liquid at 0.1 bar. A single closed feed water heater is used with steam entering at 5 bars. Determine the thermal efficiency of the cycle

Water is the working fluid in a Rankine cycle. Superheated vapor enters the turbine at 8 MPa, 5608C with a mass flow rate of 7.8 kg/s and exits at 8 kPa. Saturated liquid enters the pump at 8 kPa. The isentropic turbine efficiency is 88%, and the isentropic pump efficiency is 82%. Cooling water enters the condenser at 188C and exits at 368C with no significant change in pressure. Determine: (a) the net power developed, in kW. (b) the thermal efficiency. (c) the mass flow rate of cooling water, in kg/s