Discussion
Assertion (A): Multi-flue stacks are used where several units share one structure.
Reason (R): Each flue can then keep a high exit velocity even when its unit is at part load.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
A multi-flue stack lets each unit keep its own flue at full velocity while others are shut down or at part load - which is precisely the situation that would otherwise bring on stack tip downwash in a single large flue. Sharing one windshield is the structural convenience; keeping the velocity up is the reason it works well.
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