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A geothermal supply of hot water at 500 kPa, 150°C is fed to an insulated flash evaporator at the rate of 1.5 kg/s. A stream of saturated liquid at 200 kPa is drained from the bottom of the chamber and a stream of saturated vapor at 200 kPa is drawn from the top and fed to a turbine. Find the rate of entropy generation in the flash evaporator. 

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Best answer

Continuity  Eq

Two-phase out of the valve. The liquid drops to the bottom.

From the energy equation we solve for the flow rate 

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