A single vertical-tube evaporator is used to concentrate F kg/h of a 10% NaOH solution to 55% using steam at 3 atm pressure. The feed temperature is 40°C, and a pressure of 110 mm Hg is to be maintained in the vapor space. The overall heat transfer coefficient is 2000 W/m², and the heat-transfer area is 195 m². Determine the steam requirement and the flow rate of feed and outlet products.

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