The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

Question

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When a solution has an elevation of boiling point, the effective temperature difference across each effect in a double-effect evaporator decreases, leading to a reduction in the capacity of the evaporator compared to two single effects operating over the same terminal temperature difference. This is because the boiling point elevation reduces the temperature driving force necessary for efficient heat transfer and evaporation.

The Capacity of Double-Effect Evaporator Is Less Than Half of the Capacity