Building HVAC Control Using Damper Position as Static Pressure Proxy
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Solution Overview
Problem
Traditional volumetric control systems for building equipment face inefficiencies due to difficulties in accurately measuring static pressure within conduits, requiring intensive PID tuning and often disregarding static pressure, which can lead to energy wastage, noise, and equipment deterioration.
Innovation Solution
An environmental control system that uses the operating position of a control device, such as a damper or valve, as a proxy for static pressure to generate control signals for drive devices, adjusting flow rates and setpoints based on estimated static pressure levels, thereby eliminating the need for static pressure sensors and reducing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional static pressure sensors are installed in conduits to measure static pressure, then static pressure measurement accuracy is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent uses the control device position as a proxy or copy representation of static pressure conditions. Instead of directly measuring static pressure with sensors, the system infers pressure levels from the known position of control devices (dampers/valves), which have a predictable relationship with pressure in the conduit. This eliminates the need for physical pressure sensors while maintaining control accuracy.
Solution Approach 2:
The control device position serves as an intermediary variable that mediates between the actual static pressure condition and the control system. Rather than directly sensing pressure, the system uses the control device's operating position as an intermediate indicator that correlates with pressure levels, simplifying the measurement system while preserving control functionality.
2Device complexity
If traditional volumetric control systems disregard static pressure to simplify control, then device complexity is reduced, but energy efficiency deteriorates
Solution Approach 1:
The system implements feedback control by continuously monitoring control device positions and using this information to adjust drive device operation. The controller receives position feedback from control devices, estimates the corresponding static pressure conditions, and adjusts the drive device to maintain optimal energy efficiency. This creates a closed-loop control system that improves energy efficiency without adding complex pressure sensing infrastructure.
3Measurement precision
If PID tuning is intensively applied to traditional duct static control systems to improve control accuracy, then control precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-tuning by automatically establishing the relationship between control device positions and static pressure levels during operation. Instead of requiring manual PID tuning by specialists, the controller autonomously learns and adapts to the specific system characteristics by monitoring position-pressure correlations, making the system easier to operate and deploy without extensive commissioning.
Data Source
AI summary
An environmental control system for a building is shown. The system includes a control device operable affect a static pressure in a conduit, a building device operable to affect a flow rate of a fluid through the conduit, and a controller including a processing circuit configured to perform a volumetric control process to generate a control signal for the drive device. The processing circuit is further configured to receive an operating position signal of the control device. The processing circuit is further configured to determine an estimated static pressure level within the duct using the operating position signal of the control device and update the control signal based on the estimated static pressure level determined using the operating position. The processing circuit is further configured to operate the drive device based on the updated control signal to affect the flow rate of the fluid.