Consider a regenerative Rankine cycle with a 600_C and 4-MPa throttle, a 5-kPa condenser, and an open feedwater heater at 500 kPa. Turbine efficiencies are 85%. Neglect pump work. (a) Draw labeled, coordinated T-s and flow diagrams. (b) Determine the fraction of the throttle mass flow that passes through the extraction line. (c) Calculate the turbine work per unit mass at the throttle. (d) Calculate the cycle efficiency, and compare it with the simple-cycle efficiency. (e) Calculate the heat rate.