HVAC Controller Failure Detection via Delta T Monitoring
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Solution Overview
Problem
HVAC systems often degrade over time or operate suboptimally, leading to undesirable performance and lack of effective monitoring for performance thresholds, which can result in inefficient operation and maintenance challenges.
Innovation Solution
An HVAC controller that monitors performance signals, specifically delta T, and alerts users if performance falls below a minimum threshold, with alerts recorded and managed based on predetermined time periods and conditions such as utility shutoff or defrost cycles, allowing for timely maintenance and improved system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HVAC systems operate without continuous performance monitoring, then device complexity is reduced, but system reliability deteriorates due to undetected performance degradation
Solution Approach 1:
The HVAC controller performs self-diagnosis by automatically monitoring its own performance parameters (delta T, runtime, cycles) and comparing them against stored thresholds to detect failures. This self-service approach enables the system to monitor itself without requiring external monitoring equipment, thereby improving reliability while minimizing additional device complexity.
Solution Approach 2:
The controller implements feedback mechanisms by continuously measuring performance parameters, comparing them to predetermined thresholds, and generating alerts when failures are detected. The feedback loop includes monitoring delta T across heat exchangers, tracking system runtime, counting operational cycles, and providing user notifications through displays or remote communication, enabling proactive maintenance while maintaining reasonable system complexity.
2Loss of time
If performance monitoring and alerting features are added to the HVAC controller, then maintenance timeliness is improved, but device complexity increases
Solution Approach 1:
The HVAC controller is designed to perform multiple functions: traditional temperature control, performance parameter monitoring (delta T, runtime, cycles), failure detection, alert generation, and remote communication. By making the controller universal and multi-functional, the patent avoids adding separate dedicated monitoring devices, thereby improving maintenance timeliness while limiting the increase in overall device complexity.
Solution Approach 2:
The patent combines performance monitoring, data analysis, failure detection, and user notification functions into a single integrated controller unit. By merging these previously separate functions into one device, the system achieves timely maintenance capabilities without proportionally increasing complexity, as the controller leverages its existing processing and communication infrastructure.
3Measurement precision
If the controller monitors multiple performance parameters and conditions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The performance monitoring function is segmented into distinct measurable parameters: delta T across heat exchangers, system runtime duration, and operational cycle counts. Each parameter is monitored independently with its own threshold criteria. This segmentation allows for precise measurement of specific performance aspects while keeping the monitoring structure organized and manageable, improving measurement precision without overwhelming complexity.
Data Source
AI summary
An HVAC controller that monitors a current performance level of an HVAC system, and determines if the current performance level falls below a minimum performance threshold level for at least a first predetermined amount of time. The HVAC controller may be configured it display an alert on the display of the HVAC controller if the HVAC controller determines that the current performance level has fallen below the minimum performance threshold level for at least the first period of time. In some cases, the HVAC controller may remove the alert from the display of the HVAC controller if the current performance level subsequently rises and remains above the minimum performance threshold level for at least a second predetermined amount of time. In some cases, the first predetermined amount of time may include a utility shutoff period component and/or a defrost cycle period component.