model calibration

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Hello - I cannot seem to reconcile the demand and consumption (together) of
a 20 yr old, 4 story office building with a dysfunctional AC-only RTU and 36
VAV's with electric reheat coils. I can get the peak demand curves close,
but the consequence is a significant reduction in kWh consumption and visa
versa. Any help is appreciated. Files and reconciliation curves attached.
Thank you!!


- OSA dampers are closed continually

- Compressors are cycling on for 4-5 min, then off for 2-3 min,
then back on, this goes on 24/7 with a 1 hr shutdown at midnight

- SF & RF's running 23/7 (1 hr shutdown at midnight)

- SF, RF and relief fans are all on VFD's; relief fan did not
activate during 2 weeks of data logging

- I modeled building zones, but only 1 re-heat - did not model 36
VAV's separately (would this create the peak demand problem?) thinking the
thermal difference would be negligible

Jim Fowler, PE, CEA

Jim Fowler, PE, CEM
Jim Fowler's picture
Joined: 2012-12-14
Reputation: 1