HVAC Loop Decoupling for Independent Multi-Zone Climate Control
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Solution Overview
Problem
HVAC systems face challenges in maintaining independent control of climates in different areas due to interactions between feedback loops, which can occur when configurations change, such as when a wall separating two areas is removed, leading to inaccurate climate control.
Innovation Solution
A decoupler system is introduced to predict and mitigate the effects of control signals between feedback loops by generating modified set points based on target and feedback signals, allowing independent control of climates in each area despite interactions between loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If feedback loops are designed to be isolated from each other, then independent control of climates in different areas is achieved, but the system cannot adapt when configurations change (such as wall removal)
Solution Approach 1:
A decoupler is introduced as an intermediary component between the first and second feedback loops. The decoupler receives control signals from both loops and generates modified control signals that account for interactions between the loops. This mediator enables the system to adapt to configuration changes like wall removal without requiring complete redesign of the control architecture, thus improving adaptability while managing complexity.
Solution Approach 2:
The system implements a feedback mechanism where the decoupler continuously monitors the performance of both feedback loops and adjusts the modified control signals accordingly. By using feedback from both loops to inform the decoupler's signal modification, the system dynamically adapts to configuration changes while maintaining stable control, resolving the contradiction between adaptability and complexity.
2Productivity
If feedback loops are made interactive to share information, then system efficiency improves, but independent climate control in different areas deteriorates
Solution Approach 1:
The decoupler serves as a mediator that enables controlled interaction between feedback loops while preserving independent climate control. It selectively shares information between loops through modified control signals, allowing the system to benefit from inter-loop efficiency improvements without sacrificing the precision of independent climate control in each area.
Solution Approach 2:
The decoupler applies different modification levels to control signals based on local conditions in each area. By adjusting the degree of signal modification locally rather than uniformly across the entire system, the decoupler maintains climate control accuracy in each specific area while still enabling overall system efficiency improvements through controlled interaction.
3Adaptability or versatility
If a wall separating two areas is removed to improve space utilization, then area availability increases, but interaction between feedback loops increases causing control inaccuracy
Solution Approach 1:
When physical separators like walls are removed to improve space utilization, the decoupler acts as a virtual separator that maintains control accuracy. It processes feedback signals from both areas and generates modified control signals that compensate for the increased interaction, allowing the system to adapt to open space configurations while preserving climate control precision.
Data Source
AI summary
Disclosed is a system to control a climate of a space via a first control loop and a second control loop interacting with the first control loop. The system includes a first controller of the first control loop to generate a first control signal based on a first modified set point and a first feedback signal. The system further includes a second controller of the second control loop to generate a second control signal based on a second modified set point and a second feedback signal. The system further includes a decoupler configured to predict a first effect of the first control signal on the second control loop and a second effect of the second control signal on the first control loop, and generate the first modified set point and the second modified set point to reduce the first effect and the second effect.