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     EduGorilla 
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    A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed because

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    1. total heat transfer area of all the effects is less than that in a single effect evaporator system
    2. total amount of vapour produced per kg of feed steam in a multi-effect system is much higher than in a single effect
    3. boiling point elevation in a single effect system is much higher than that in any effect in a multi- effect system
    4. heat transfer coefficient in a single effect is much lower than that in any effect in a multi-effect system
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