I thought that I did this yesterday, but lucky for you it didn't post so I'll keep it much shorter on this try.
Is everyone just making up numbers for this input?
Unless you have a downward blowing diffuser and can easily calculate (estimate) a velocity, or have have horizontally-blowing diffusers close to a wall, there is no way to get this velocity without computational flow dynamics.
I could with some reasonable certainty enter a value like "less than 40 fpm" or "less than 15 fpm" etc, but that is not what LEED allows.
Is everybody else just throwing something on there and LEED review doesn't call them out?
thanks
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Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
962 thumbs up
June 13, 2017 - 1:49 pm
It's "don't ask, don't tell". I think folks are making reasonable guesses. Not CFD.
Anthony Hardman
Building Performance AnalystThe Green Engineer
16 thumbs up
June 13, 2017 - 2:58 pm
I've never seen GBCI deny the credit due to velocity objections although in theory, they should probably be asking for some level of CFD analysis to confirm air velocities for displacement ventilation systems.