Several geothermal power plants are in operation in the United States and more are being built since the heat source of a geothermal plant is "free energy". An 8-MW geothermal power plant is being considered at a location where geothermal water at 160C is available. Geothermal water is to serve as the heat source for a Rankine power cycle with R-134a as the working fluid. Limiting the design to a single reheat pass and a single feedwater heater (open or closed), determine the optimal pressures, temperatures, and fraction of steam extracted to maximize thermal efficiency.