Which digital control system is designed to serve multiple zones with varying air flow?

Which digital control system is designed to serve multiple zones with varying air flow?

• A. zone mix system
• B. variable air-volume system
• C. centralized constant-volume
• D. passive cooling system

Answer: (B)

Variable air-volume systems are built to deliver different amounts of conditioned air to multiple zones based on each zone’s current heating or cooling needs, and they use digital controls to coordinate dampers and sometimes fan speed. Each zone has a thermostat or sensor that signals the central controller to open or close its damper, increasing airflow to zones that need cooling or reducing it where less air is required. The supply air usually comes from a single source at a relatively constant temperature, while the actual volume varies by zone, which helps match outdoor conditions and occupancy with energy efficiency and comfort. This approach is ideal for multi-zone buildings because it lets the system tailor airflow to each space instead of pushing the same amount of air everywhere. In contrast, a centralized constant-volume system delivers the same amount of air to all zones regardless of demand, which can waste energy and fail to maintain comfortable conditions in differently loaded areas. A zone mix system and passive cooling don’t provide the same level of zone-by-zone, digitally coordinated airflow control.

Variable air-volume systems are built to deliver different amounts of conditioned air to multiple zones based on each zone’s current heating or cooling needs, and they use digital controls to coordinate dampers and sometimes fan speed. Each zone has a thermostat or sensor that signals the central controller to open or close its damper, increasing airflow to zones that need cooling or reducing it where less air is required. The supply air usually comes from a single source at a relatively constant temperature, while the actual volume varies by zone, which helps match outdoor conditions and occupancy with energy efficiency and comfort.

This approach is ideal for multi-zone buildings because it lets the system tailor airflow to each space instead of pushing the same amount of air everywhere. In contrast, a centralized constant-volume system delivers the same amount of air to all zones regardless of demand, which can waste energy and fail to maintain comfortable conditions in differently loaded areas. A zone mix system and passive cooling don’t provide the same level of zone-by-zone, digitally coordinated airflow control.