Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?
Correct answer: A. Both A. & B.
- A. Both A. & B.
- B. difference
- C. Economic limit reached, when the plant cost exceeds the saving of steam
- D. Practical limit reached, due to low heat transfer rate because of inadequate temperature
- E. Neither A. nor B.
Explanation
Adding effects eventually gives too little temperature difference per effect, reducing heat-transfer rates, while the extra equipment also becomes economically unjustified. Therefore both practical and economic limits restrict the number of effects.
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