Calculate the actual feed rate

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Reference no: EM13951259

Evaporation in Double-Effect Reverse-Feed Evaporators. A teed containing 2 wt % dissolved organic solids in water is fed to a double-effect evaporator with reverse feed. The feed enters at 100^oF and is concentrated to 25% solids.

The boiling-point rise can be considered negligible, as can the heat of solution. Each evaporator has a 1000-ft² surface area, and the heat-transfer coefficients are U₁ = 500 and U₂= 700 btu/h ft² . The feed enters evaporator number 2 and steam at 100 psia is fed to number 1.

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 = 1000 lb_m/h and a value of T₁

Calculate the area and T₁. Then calculate the actual feed rate by multiplying 1000 by 1000/calculated area.)

Reference no: EM13951259

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