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a triple effect evaporator with forward feed evaporating aqueous solution with negligible boiling point rise and containing 1 0 w t % solids to 5

a triple effect evaporator with forward feed evaporating aqueous solution with negligible boiling point rise and containing 10wt% solids to 50% solids. fresh saturated steam at 1.02atm abs (corresponding to 120C of temperature) is used for heating in the first effect. the pressure in the vapor space of the third effect is 10cmHg. at given pressure, the boiling point of the solution is in the third effect is 51C. the feed rate 25000kgh and temperature 21C. the liquid heat capacity is 4.18kjkg*C for all liquid concentrations. the heat transfer coefficients are u1=2750,u2=1750 and u3=1000kcalm2.hC
Calculate the surface area of each effect, mass flow rate of the steam, distribution of temperatures in each effect and steam economy of system.
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