Question Bank • QB_APE_EXP_066 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Evaporation and Drying

Subtopic: Concentration and drying of liquid foods – evaporators, tray, drum and spray dryers

Question Statement:

A single-effect evaporator concentrates tomato juice from $6\%$ total solids to $30\%$ total solids at a feed rate of $1500\text{ kg/h}$. Calculate the rate of water evaporation in $\text{kg/h}$.

Answer Key:

1200

Step-by-Step Solution & Explanation

Overall solid balance: $F \times x_F = P \times x_P$ $1500 \times 0.06 = P \times 0.30$ $90 = 0.30 P \implies P = 300\text{ kg/h}$ Total mass balance: $F = P + W$ $W = F - P = 1500 - 300 = 1200\text{ kg/h}$
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