A solar-power-tower plant considered in Tucson, Arizona. Heliostat with a total area of 80,000 m^2 are to be used to reflect a solar radiation into a receiver. When the solar irradiation is 950 W/m^2 on any given day, steam is produced at 2 MPa and 400C at a rate of 20 kg/s. This steam is expanded in a turbine to 20 kPa pressure. The isentropic efficiency of the turbine is 85 percent. The average annual irradiation in Tucson is 20.44 MJ/m^2. Required:
a. Determine the power output and the thermal efficiency of the plant when the solar radiation is 950W/m.
b. How much electricity can be produced per year if the average thermal efficiency is 15 percent and the generator efficiency is 96 percent?