2. A steam power plant operates on the Rankine cycle with reheat. Steam enters the high pressure turbine at 12.5 MPa and 550°C at a rate of 7.7 kg/s and leaves at 2 MPa. The steam is then reheated at constant pressure to 450°C before expanding in the low pressure turbine. The isentropic efficiencies of the turbine and pump are 85 percent and 90 percent, respectively. The steam leaves the condenser as a saturated liquid. If the moisture content of the steam at the turbine exit is not to exceed 5 percent and the maximum efficiency of the cycle is to be 37%, determine: a) the condenser pressure and b) the net power output. c) Draw the T-s graph of the complete system and the diagram with all the components and processes of both cycles, indicate all the states in both cases (1, 2, 3….)
2. A steam power plant operates on the Rankine cycle with reheat. Steam enters the high pressure turbine at 12.5 MPa and 550°C at a rate of 7.7 kg/s and leaves at 2 MPa.
The steam is then reheated at constant pressure to 450°C before expanding in the low pressure turbine. The isentropic efficiencies of the turbine and pump are 85 percent and 90 percent, respectively. The steam leaves the condenser as a saturated liquid. If the moisture content of the steam at the turbine exit is not to exceed 5 percent and the maximum efficiency of the cycle is to be 37%, determine:
a) the condenser pressure and
b) the net power output.
c) Draw the T-s graph of the complete system and the diagram with all the components and processes of both cycles, indicate all the states in both cases (1, 2, 3….)
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