Staged damper system
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Solution Overview
Problem
Traditional HVAC systems maintain constant airflow through rooms regardless of occupancy, leading to unnecessary energy consumption and excess ventilation, which can exceed minimum requirements.
Innovation Solution
A staged damper system with a first stage that limits airflow when a room is unoccupied and a second stage with an automatic balancing damper that adjusts airflow to meet occupancy needs, allowing for turndown of ventilation and maintaining setpoints, integrated into HVAC ducts to vary airflow based on room occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant airflow is maintained through rooms regardless of occupancy, then ventilation requirements are met, but energy consumption increases unnecessarily
Solution Approach 1:
The damper system dynamically adjusts airflow based on room occupancy status. The first stage damper transitions between fully open (occupied) and partially closed/unoccupied positions (unoccupied), while the second stage automatic balancing damper continuously modulates to maintain setpoint airflow. This dynamic adjustment eliminates constant full airflow, reducing energy consumption while ensuring adequate ventilation when rooms are occupied.
2Use of energy by moving object
If airflow is limited when rooms are unoccupied, then energy consumption is reduced, but ventilation control complexity increases
Solution Approach 1:
The ventilation control function is segmented into two independent stages: the first stage damper controlled by occupancy sensors to provide coarse airflow adjustment, and the second stage automatic balancing damper to provide fine-tuned continuous modulation. This segmentation allows each stage to perform its specific function optimally, managing overall system complexity through functional decomposition.
Solution Approach 2:
The automatic balancing damper acts as an intermediary between the occupancy-based control signal and the final airflow delivery. It receives control inputs and continuously modulates to maintain the desired airflow setpoint, bridging the gap between discrete occupancy detection and continuous airflow regulation.
3Reliability
If excess ventilation is provided beyond minimum requirements, then indoor air quality standards are exceeded, but energy re-conditioning loads increase
Solution Approach 1:
The automatic balancing damper implements feedback control by continuously monitoring airflow and comparing it to the desired setpoint. Based on this feedback, the damper modulates its position to maintain precise airflow control, preventing both excessive ventilation and insufficient ventilation. This ensures indoor air quality compliance while minimizing energy re-conditioning loads by delivering only the required ventilation amount.
Data Source
AI summary
A damper system includes a damper housing configured to flow air, a damper blade disposed in the damper housing and having an orifice, the damper blade being rotatable in the damper housing between a closed position and an open position. The orifice is configured to allow air to flow through the damper blade while the damper blade is in the closed position. An auto-balancing damper is disposed in the damper housing apart from the damper blade, and the auto-balancing damper is configured to regulate a flow of the air through the damper housing.