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The model has many spaces which are lumped into 4 thermal zones. All 4 zones are served by a single, very large VAV system. This VAV system:

  1. Has no Demand Control Ventilation (DCV)
  2. Has no max OA fraction schedule (to close the OA damper at night)
  3. Has a low fan efficiency (~0.4)

This combination of controls likely means that you are bringing in very high (design day) amounts of Outdoor Air 24/7/365, and you are moving it with a low efficiency fan...resulting in higher than what you'd expect for fan energy. I'd recommend zoning the model into smaller zones and perhaps (unless this is an existing building) splitting the zones onto multiple VAV systems based on their loads.

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