7-38 A steam power plant
operates on the reheat Rankine cycle. 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. Steam is then
reheated at constant pressure to 450°C before it expands in the low-pressure turbine.
The isentropic efficiencies of the turbine and the pump are 85 percent and 90
percent, respectively. Steam leaves the condenser as a saturated liquid. If the
moisture content of the steam at the exit of the turbine is not to exceed 5
percent, determine (a) the condenser pressure, (b) the net power output, and (c) the thermal efficiency.
Observação: sobre a determinação da pressão no condensador (Clique AQUI para baixar a planilha)
