HVAC Controller Coordination for Uniform Multi-Zone Comfort
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Solution Overview
Problem
Multi-story buildings often experience temperature and humidity variations due to uneven load distribution among independent HVAC systems, leading to discomfort and increased energy costs, as one system consistently runs more than the others, causing imbalance in heating or cooling loads.
Innovation Solution
Implementing a communication link between HVAC controllers to share load metrics, allowing one controller to adjust its operation based on the load of another, thereby balancing the duty cycles and setpoint temperatures across different zones, reducing the imbalance and improving overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent HVAC systems operate autonomously without coordination, then each system can maintain its own setpoint temperature independently, but uneven load distribution occurs causing some systems to run excessively while others run insufficiently
Solution Approach 1:
The patent merges previously independent HVAC control systems by implementing inter-controller communication that allows controllers to share operational data and coordinate their operation. This combination enables load balancing while maintaining individual temperature control capabilities, resolving the contradiction between operational independence and load distribution reliability.
Solution Approach 2:
The patent implements feedback mechanisms where HVAC controllers exchange operational status and load information with neighboring controllers. This feedback loop enables each controller to adjust its operation based on the status of other systems, preventing excessive runtime on any single system while maintaining effective temperature control in each zone.
2Productivity
If one HVAC system runs more frequently to meet cooling demands, then that system handles higher thermal loads, but this creates imbalance and increases energy costs across the building
Solution Approach 1:
By combining the operational capabilities of multiple HVAC systems through coordinated control, the building can distribute thermal load handling across all available systems rather than relying on one system to handle excessive loads. This merging approach reduces the runtime and energy consumption of individual systems while maintaining adequate cooling capacity.
Solution Approach 2:
The patent implements dynamic load distribution where the operational status of each HVAC system adjusts in real-time based on building conditions and the status of other systems. This dynamic coordination allows the system to optimize energy usage by activating or deactivating specific HVAC units based on current demand and system availability, preventing any single system from running excessively.
3Adaptability or versatility
If multiple HVAC systems service different portions of a building, then each system can be controlled independently based on local thermal loads, but temperature and humidity variations occur due to lack of coordination
Solution Approach 1:
The patent implements feedback communication between HVAC controllers that allows each system to be aware of the operational status and environmental conditions in other zones. This feedback mechanism enables coordinated control decisions that maintain temperature and humidity uniformity across the building while preserving the ability of each system to respond to its local thermal load.
Solution Approach 2:
The coordinated control system provides universal functionality across all HVAC systems, enabling them to work together as an integrated network. Each controller not only manages its local zone but also contributes to overall building environmental stability by coordinating with other controllers, thus achieving both local adaptability and global uniformity.
Data Source
AI summary
Various embodiments provide an HVAC system that includes first and second controllers. The first controller is configured to control a first demand unit to maintain a setpoint temperature of a first portion of a conditioned space. A second HVAC controller is configured to control a second demand unit to maintain a setpoint temperature of a second portion of the conditioned space. The control provided by the second controller is dependent on a load metric of the first demand unit.