[Bldg-sim] Modelling for retrofit ECM's

[R B]

Hi All,
While modelling existing building (with calibration to utility bill), do you
model every VAV zone or lump similar ones together? What could be possible
disadvantages of lumping down the road? Any ECM's that will be affected by
this simplification?
Is there a magical way to figure the W/sqft for lighting and plug loads
without having to count everything on site?
Thanks for any insights.
-Rohini
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