HVAC Zone Temperature Monitoring with Threshold-Based Shutdown Control
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Solution Overview
Problem
HVAC systems continue to operate despite hardware and software issues, leading to extreme temperature conditions in indoor environments, making living conditions uncomfortable for users without alerting them to malfunctions.
Innovation Solution
An HVAC system that detects current temperature values in zones, compares them to set point ranges and threshold values, and triggers control actions such as damper adjustments or system shutdowns to prevent over-conditioning, while generating alerts for user notification of malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the HVAC system operates continuously based on user requirements, then the temperature control responsiveness is improved, but the system reliability deteriorates due to hardware and software issues causing uncontrolled operation
Solution Approach 1:
The system implements continuous temperature monitoring with feedback control that compares actual temperature against threshold values and set point ranges. When the temperature reaches a threshold or the system detects abnormal conditions, the feedback loop triggers corrective actions such as shutting down the HVAC unit or adjusting operational parameters, thereby preventing uncontrolled operation while maintaining responsive temperature control.
Solution Approach 2:
The system establishes predetermined threshold values and set point ranges before operation begins. These preliminary parameters define safe operating boundaries, and the system is configured to automatically take corrective action when these boundaries are approached or violated, preventing problematic conditions before they escalate.
2Device complexity
If the HVAC system operates without monitoring extreme conditions, then the system complexity is reduced, but the living comfort deteriorates due to extreme temperature conditions
Solution Approach 1:
The system monitors temperature as a critical parameter and compares it against predetermined threshold values and set point ranges. When the temperature parameter reaches critical thresholds, the system automatically changes operational parameters such as shutting down the HVAC unit or adjusting airflow, thereby preventing extreme temperature conditions without requiring complex monitoring infrastructure.
3Reliability
If the system shuts down completely when issues are detected, then the system reliability is improved by preventing extreme conditions, but the temperature control performance deteriorates due to interruption of service
Solution Approach 1:
Instead of complete system shutdown, the system applies partial action by selectively closing dampers in specific zones where temperature thresholds are exceeded or where hardware/software issues are detected. This allows the HVAC system to continue operating in unaffected zones, maintaining temperature control continuity while still preventing extreme conditions in problem areas.
Solution Approach 2:
The system divides the HVAC control into separate zone-level operations with individual dampers for each zone. When an issue is detected in one zone, only that zone's damper is closed while other zones continue normal operation. This segmentation allows localized corrective action without interrupting service to the entire building.
Data Source
AI summary
Embodiments of the disclosure describe systems and methods for managing temperature control in an indoor environment, having a plurality of zones, by a Heating Ventilation, and Air Conditioning (HVAC) system. The method comprises, for each zone, detecting a current temperature value of a corresponding zone, comparing the current temperature value with one of a first threshold value and a second threshold value for the corresponding zone, and determining, based on the comparison, whether the current temperature value reaches one of the first threshold value or the second threshold value, and in response to the determination, triggering one of a first control action or a second control action for the corresponding zone. The second threshold value is one of greater than or less than the first threshold value and a set point range for the corresponding zone when one of heating or cooling is being performed by the HVAC system.