Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?
Correct answer: B. 1.5 to 2.5
- A. 0.01 to 1
- B. 1.5 to 2.5
- C. 5 to 10
- D. 10 to 20
Explanation
Rotary dryers are generally designed economically for a modest number of heat-transfer units, about 1.5 to 2.5. Much larger values would require excessive dryer length and cost for comparatively limited additional benefit.
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