This is a potentially simple problem to solve, but after modeling a typical office building in OpenStudio with typical loads (5p/1000sf, 0.9w/sf lighting, ~ 1w/sf equipment/elevators, 62.1 defaults, etc.) I am seeing drastically low demand in the "Demand End Use Components Summary" for Cooling and Fans.
Cooling is ~ 5 btuh/sf (576.4 sf/ton @ 88tons and 51,000 sf) (sf/ton is pretty high, Fans = see example below Heating is ~ 23 btuh/sf (seems about right)
I know a portion of this is due to the design days in the schedules, sizing vs energy runs, etc. but what could account for the fact that I'm seeing ~30% of the fan demand power compared to that sized in the "Equipment Summary".
Eg. 39.6kW (0.0015 hp/cfm is what I input) from Equipment Summary & 13.8 kW from Demand End Use Components Summary (and LEED summary)
Almost all the defaults are left alone for the template system (Packaged DX Rooftop VAV with reheat) 3.4 COP on DX 2speed Sensible Load sized 55 degF Central Cooling Design Supply Air Temperature 0.0085 humidity ratio (~60 on the psych chart) 5.5 in wc fan pressure rise (represents approximate 90.1 fan power limitation on a VAV) 60% fan efficiency
Thanks for any light shed on this.
