VAV Box Association Using Sensor-Based Air Source Detection
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Solution Overview
Problem
Configuring and balancing large HVAC systems with multiple air sources and VAV boxes is labor-intensive and prone to human error, requiring manual programming and association, which becomes complex and inefficient, especially in multi-space buildings.
Innovation Solution
A building automation system (BAS) controller automatically determines and associates VAV boxes with air sources by monitoring sensors and adjusting airflow settings, reducing the need for manual programming and enhancing system balance through a one-to-many or many-to-many relationship configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual programming or data entry is used to transfer VAV box relationships to a digital BAS environment, then the relationships can be configured, but the process is labor-intensive and subject to human error
Solution Approach 1:
The system enables automatic self-association of VAV boxes with air sources through sensor monitoring and sequence detection. The BAS controller automatically determines relationships by monitoring sensor data and component actuations without requiring manual programming, thereby eliminating human error and reducing configuration time.
Solution Approach 2:
The system utilizes changes in sensor parameters (such as airflow, pressure, or temperature readings) to automatically detect and establish VAV box associations with air sources. By monitoring parameter changes in response to component actuations, the system dynamically determines relationships without manual intervention.
2Adaptability or versatility
If multiple air sources are tied to multiple VAV boxes in a large system, then the system can serve more spaces, but the complexity of configuration and balancing increases substantially
Solution Approach 1:
Each VAV box automatically associates itself with the appropriate air source(s) through sensor monitoring and sequence detection. This self-service mechanism eliminates the need for complex manual configuration even in large systems with multiple air sources and VAV boxes, thereby maintaining low configuration complexity while supporting high system capacity.
Solution Approach 2:
The system divides the complex multi-air-source configuration task into individual VAV box associations. Each VAV box independently determines its relationship with air sources through localized sensor monitoring, breaking down the overall system complexity into manageable independent units.
3Adaptability or versatility
If existing BAS must be reconfigured and rebalanced to recognize changes in VAV system components, then the system can be upgraded or expanded, but the process is complex and time-consuming
Solution Approach 1:
When new VAV boxes or air sources are added to the system, they automatically associate themselves with the appropriate components through sensor monitoring and sequence detection. This eliminates the need for manual reconfiguration during system upgrades or expansions, making the process simple and straightforward.
Solution Approach 2:
The system automatically detects and records VAV box associations with air sources as components are introduced, rather than requiring post-installation configuration. This preliminary automatic association simplifies the upgrade process by eliminating subsequent manual programming requirements.
Data Source
AI summary
A system and method including the ability of a building automation system controller to automatically determine which VAV boxes are physically associated with which air sources in a building or facility with multiple air sources by coordinating the individual or simultaneous manipulation of the fan speed of the air sources or the VAV damper positions, while obtaining data from networked sensors that measure VAV box airflow or duct pressure or the environmental conditions of a space being supplied with air from one or more VAV boxes.