In a single effect evaporator, the economy is________________?
Correct answer: B. < 1
- A. 1
- B. < 1
- C. > 1
- D. None of these
Explanation
The economy of a single-effect evaporator is normally less than unity because some steam heat is consumed in heating the feed and is lost to the surroundings. Multiple effects can approach or exceed this value by reusing vapour heat.
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