Hvac Zones

The numbers and types of HVAC zones required for thermal comfort influence the selection of centralized versus local HVAC equipment systems. A zone placed away from the building envelope may not have the access to outdoor air required for a localized system. Space must be available for equipment within a local zone.

Large multipurpose buildings conventionally use a system of 16 zones (Fig. 26-1). Each function— apartments, offices, and stores—has five zones: north, east, south, and west sides, and a central core. Underground parking is the sixteenth zone. Each of these zones may encompass more than one floor. Adding in scheduling considerations may increase the number of zones. If apartments need individual controls, each apartment may become one zone.

Underground parking: 1 zone

Figure 26-1 Building perimeter and interior zones.

> Apartments: 5 zones

Underground parking: 1 zone

Figure 26-1 Building perimeter and interior zones.

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