Question Bank • QB_APE_EXP_084 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 triple-effect evaporator consumes $2000\text{ kg/h}$ of live steam and evaporates a total of $5200\text{ kg/h}$ of water from liquid food concentrate. Calculate the steam economy of the evaporator system.

Answer Key:

2.6

Step-by-Step Solution & Explanation

Steam Economy is the ratio of total mass of water evaporated to the mass of live steam supplied: $\text{Steam Economy} = \frac{\text{Water Evaporated}}{\text{Steam Consumed}} = \frac{5200\text{ kg/h}}{2000\text{ kg/h}} = 2.6$
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