Question Bank • QB_EXP_APE_EVP_005 NAT • 1 Mark

Section 6: Agricultural Process Engineering

Evaporation & Liquid Food Concentration

Subtopic: Steam economy of multiple effect evaporator

Question Statement:

A triple-effect evaporator evaporates $V = 2400\text{ kg/h}$ of water from fruit juice using a boiler steam supply rate of $S = 800\text{ kg/h}$ to the first effect. The steam economy of the evaporator system is ________ (round off to two decimal places).

Answer Key:

3.00

Step-by-Step Solution & Explanation

Steam economy is defined as: $\text{Steam Economy} = \frac{\text{Total Water Evaporated (kg/h)}}{\text{Steam Supplied (kg/h)}} = \frac{2400}{800} = 3.00$ (For a triple-effect evaporator, theoretical steam economy typically approaches $2.5 - 2.8$).
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