Question: Fresh water can be produced from saltwater by evaporation and subsequent condensation. An example is shown where 300-lbm/s saltwater, state 1, comes from the condenser

Fresh water can be produced from saltwater by evaporation and subsequent condensation. An example is shown where 300-lbm/s saltwater, state 1, comes from the condenser in a large power plant. The water is throttled to the saturated pressure in the flash evaporator and the vapor, state 2, is then condensed by cooling with sea water. As the evaporation takes place below atmospheric pressure, pumps must bring the liquid water flows back up to P0. Assume that the saltwater has the same properties as pure water, the ambient is at 68 F, and that there are no external heat transfers. With the states as shown in the table below find the irreversibility in the throttling valve and in the condenser.

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