What does dynamic reset refer to in ventilation systems?

What does dynamic reset refer to in ventilation systems?

• A. Resetting to default factory settings
• B. Reversing air flow in ducts at night
• C. Changing outdoor air based on occupancy schedule and head count
• D. Constant outdoor air regardless of occupancy

Answer: (C)

Dynamic reset means adjusting the amount of outdoor air the system supplies based on how many people are in the space and when they’re there. The idea is to increase outdoor air when occupancy or headcount is high to keep IAQ up, and to reduce outdoor air when spaces are empty or lightly occupied to save energy, all while staying within the minimum requirements. That occupancy-driven adjustment is what makes it dynamic, rather than a fixed or constant outdoor-air rate. So changing outdoor air based on occupancy schedule and head count best captures the concept.

Dynamic reset means adjusting the amount of outdoor air the system supplies based on how many people are in the space and when they’re there. The idea is to increase outdoor air when occupancy or headcount is high to keep IAQ up, and to reduce outdoor air when spaces are empty or lightly occupied to save energy, all while staying within the minimum requirements. That occupancy-driven adjustment is what makes it dynamic, rather than a fixed or constant outdoor-air rate. So changing outdoor air based on occupancy schedule and head count best captures the concept.