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ODCV Side-by-Side Comparison
AHU-2 serves floors 3-4: completely unleased and empty. How much energy does a building waste ventilating space nobody uses?
AHU-2 serves floors 3-4: completely unleased and empty. Without ODCV, the outdoor air damper stays locked at design position (1,700 CFM), cooling 95°F air for nobody.
Watch the savings accumulate. With ODCV, outdoor air drops to zero: ASHRAE 62.1 Section 6.1 applies only to occupied spaces. An unleased floor has no occupants to protect, so the OA damper closes completely.
AHU-4 serves floors 7-8: a tenant with 2-3 days per week attendance and 15% peak occupancy. Variable demand, constant ventilation.
AHU-4 serves floors 7-8: a hybrid tenant with 2-3 days/week attendance and 15% peak occupancy. The baseline damper ignores all of this and delivers maximum outdoor air regardless.
Watch the ODCV damper modulate with real-time occupancy. As people arrive in the morning and leave in the afternoon, the outdoor air fraction adjusts automatically. The baseline side stays flat.
AHU-9 serves floors 17-18: the building's busiest tenant at 50% peak occupancy. Even here, the system is oversized.
AHU-9 serves floors 17-18: the building's most active tenant with 50% peak occupancy. Even here, the design ventilation rate assumes 100% occupancy that never materializes.
Even at 50% peak, the actual OA requirement is ~15% less than the design rate. ODCV right-sizes ventilation to match reality: every AHU in the building saves energy, even the busiest ones.