Hot water at 500kPa and 150°C is fed on a steady state basis through a throttling valve where the pressure is reduced to 200kPa, and is exhausted into an insulated tank. Some of the water vaporizes so that the tank contains a saturated mixture of liquid and vapor. The saturated liquid is drained from the bottom at 200kPa. The 200kPa saturated vapor is taken off the top of the tank to an adiabatic steam power turbine which has an isentropic efficiency of 80%. The turbine exit pressure is 15kPa. Calculate the turbine work per unit mass of the inlet water to the tank. All process are in a steady state.

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