The outdoor air ventilation rates for the reference building shall be modeled as being identical to those determined for the proposed building. Outdoor air ventilation rates can be set via the System Parameters>Room Ventilation & Exhaust tab.
For the reference model demand control ventilation (DCV) is only required in heated parking garages, otherwise it is not modelled in the reference building.
For NECB Reference Systems in ApacheHVAC that need DCV, modellers may use Prototype System 5b as an example for adding the damper and controllers to the reference system.
Figure 5: Prototype System 5b with network and controllers relevant to DCV selected
Figure 6: Zone Ventilation & Exhaust tab of the System Parameters dialog with DCV option highlighted
It should also be noted that as per Table 8.4.4.8.B that except for HVAC systems serving dwelling units, outside air requirements for the thermal blocks served by the reference systems should be met by a single ventilation system able to meet all the required outside and exhaust air rates. For HVAC systems serving dwelling units, outside air requirements shall be met by a ventilation system identical to that of the proposed building.
