The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?
Correct answer: B. Most concentrated liquid is at highest temperature
- A. Heat sensitive material can be handled
- B. Most concentrated liquid is at highest temperature
- C. There is no additional cost of pumping
- D. Equal heat transfer co-efficients exist in various effects
Explanation
In backward feed, the most concentrated and viscous liquid is heated in the last effect, where the temperature is highest. This improves its flow and heat transfer, whereas forward feed is preferred for heat-sensitive materials.
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