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Heat and Mass Transfer

Problem:

A feed of 6804 kg/h of a 2.0 wt % salt solution at 311 K enters continuously a single-effect evaporator and is being concentrated to 3.0%. The evaporation is at atmospheric pressure and the area of the evaporator is 69.7 m^2. Saturated steam at 383.2 K is supplied for heating. Since the solution is dilute, it can be assumed to have the same boiling point as water. The heat capacity of the feed can be taken as cp=4.10 kJ/kg K. Calculate the amounts of vapor and liquid product, and the overall heat-transfer coefficient U.