How are the tube surfaces in falling film evaporators heated to enhan – McqOptions

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1.	How are the tube surfaces in falling film evaporators heated to enhance evaporation?
A.	Heaters at about 200℃
B.	Heaters at above 200℃
C.	Heaters at just above 100℃
D.	Steam condensing at the outer wall
Answer» E.

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