Discussion
A stack's exit velocity is usually specified to be at least
Answer: B
Correct answer: 1.5 times the design wind speed
Below about 1.5 times the wind speed the plume is drawn into the low-pressure wake behind the stack - stack tip downwash - and the effective height collapses. The rule is a cheap insurance: it costs a little fan power and protects the whole benefit of the stack’s height.
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