Question 3 ( 6 points) in a reheat steam Rankine cycle, steam enters the highpressure turbine at 12.5MPa and 550C at a rate of 7.7kg/s and feaves at 2MPa. Steam is then reheated at constant pressure to 450C before it expands in the low-pressure turbina. 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 net power output, and (b) the thermal efficiency. From the steam tables: P6=?s8=s5}h6t= The presuare at state 6 may be determined by a trial-enor approach from the steam tabler or by three equatiots: P6=9.73kPa,f6=2463.3kJ/kz Given: h1 and v1 : h1=hfg973ha=189.57kJ/kgv2=vfe1013=0.001010m3/kg Given: turbine efficiency of high pressure (3 to 4) turbine and low pressure ( 4 to 5) turb T=h3h45h3h4T=h5h64h5h6