4. Superheated steam at 20 MPa, 560 C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 C. The pressure in increase to 20.1 MPa across the pump. The turbine and pump have isentropic efficiencies of 81% and 85% respectively. Cooling water enters the condenser at 20 C with a mass flow rate of 70.7 kg/s and exits the condenser at 38 C. For the cycle, determine (a) the mass flow rate of steam, in kg/s, and (b) the thermal efficiency of the power plant.

To design a steam turbine to produce 12,000 hp power. a engineer comsiders using a steady state stean low st 1160fr and engineer considers using a steady state steam flow at 1160°r and 450 psia to drive this steam turbine. the exhaust of the steam is cooled by the lake (vacuum). heat losing to the surroundings is measured at a rate of 555.55 btu/s. (a) sketch the system with the given conditions. (b) neglecting kinetic and potential energy changes from inlet to exit, determine the volumetric flow rate of the steam at the inlet, (ft'/hr). must clearly show unit conversions at crtical terms.