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8.5-3 Evaporation in Double-Effect Reverse-Feed Evaporator. A feed containing 2wt% dissolved organic solids in water is fed to a double-effect evaporator with reverse feed. The feed enters at 100F and is concentrated to 25% solids. The boiling-point rise can be considered negligible, as can the heat of solution. each evaporator has a 1000ft^2 surface area, and the heat transfer coefficients are U1=500 and U2=700btu/hft2 F. the feed enters evaporator number2 and steam at 100 psia is fed to number1. The pressure in the vapor space of evaporator number 2 is 0.98 psia. Assume that the heat capacity of all liquid solutions is that of liquid water. calculate the feed rate F and the product rate L1 of a solution containing 25% solids. (Hint : assume a feed rate of, say, F=1000lbm/h and a value of T1. Calculate the area and T1, then calculate the actual feed rate by multiplying 1000 by 1000/calculated area). ANSWER :
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