Failsafe gas leak detection and mitigation system and method
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Solution Overview
Problem
Conventional HVAC systems lack a reliable method for detecting and mitigating hydrocarbon-based gas (HBG) leaks, which can lead to significant disruptions and safety hazards due to the difficulty in detecting small leaks and the risk of fires or explosions.
Innovation Solution
A system and method that utilize a hydrocarbon gas detection system tolerant of background emissions, dynamically adaptable to various hydrocarbon gas sensors, and employing a closed control loop to detect true HBG leaks and mitigate them by isolating the failing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas detection methods are used in HVAC systems, then the system structure remains simple, but the system cannot reliably detect small hydrocarbon gas leaks due to background emissions interference
Solution Approach 1:
The patent implements a closed-loop feedback control system where the gas sensor continuously monitors hydrocarbon levels, the microcontroller compares readings against dynamic thresholds, and the system adjusts operation accordingly. This feedback mechanism enables reliable leak detection by constantly comparing actual gas levels with acceptable ranges and triggering alerts or shutdowns when thresholds are exceeded, resolving the contradiction between detection precision and system complexity.
Solution Approach 2:
The patent employs dynamic threshold adjustment based on operating conditions rather than fixed thresholds. The system adapts detection sensitivity according to background emissions levels, temperature, and humidity conditions. This dynamic approach allows the system to maintain high detection precision across varying environmental conditions without requiring overly complex calibration procedures, thus balancing measurement precision with manageable system complexity.
2Reliability
If no gas leak mitigation system is implemented, then the system complexity remains low, but small leaks go undetected leading to fire or explosion hazards
Solution Approach 1:
The patent implements preliminary safety actions by continuously monitoring gas levels and triggering mitigation measures before hazardous conditions develop. The system detects small leaks early through sensitive gas sensing and automatically initiates shutdown procedures, ventilation activation, or alarm signals before leak levels reach dangerous thresholds. This preliminary action approach ensures high reliability by preventing fires or explosions before they can occur, while maintaining relatively simple system architecture through automated preventive controls.
Solution Approach 2:
The system incorporates self-service safety mechanisms where the HVAC system automatically detects and responds to gas leaks without requiring external intervention. The microcontroller autonomously processes sensor data, compares readings against safety thresholds, and executes mitigation protocols such as shutting down gas valves or activating alarms. This self-service capability enhances safety reliability while minimizing the complexity of external monitoring and manual intervention systems.
3Object-affected harmful factors
If a gas leak detection system is added to HVAC systems, then safety against fires or explosions is improved, but the system complexity increases
Solution Approach 1:
The patent integrates gas leak detection and mitigation functions into the existing HVAC control architecture, making the control system multi-functional. The same microcontroller that manages HVAC operation also processes gas sensor data and executes safety protocols. The gas sensor serves dual purposes by monitoring both operational efficiency and safety conditions. This universal approach reduces overall system complexity by consolidating functions rather than adding separate dedicated safety systems, thereby improving fire and explosion protection while minimizing the increase in device complexity.
Data Source
AI summary
A failsafe hydrocarbon-based gas (HBG) leak detection (HLD) and mitigation (HLM) system/method for use in heating, ventilation, and air conditioning (HVAC) systems that incorporates a hydrocarbon gas sensor (HGS), sensor signal conditioner (SSC), alarm status indicator (ASI), and digital control processor (DCP) is disclosed. The HGS detects ambient hydrocarbon gas (AHG) and presents a hydrocarbon sensor voltage (HSV) to the SSC. The DCP and SSC form a closed control loop (CCL) in which the SSC electrical characteristics are adjusted by the DCP such that the HSV is continuously and dynamically recalibrated to account for background HBG levels, changes in ambient air conditions, HGS manufacturing tolerances, and other field-specific operational conditions that impact the HGS detection capabilities. The DCP is configured to log alarms to the ASI if a HGS HBG leak is detected and optionally shutdown gas flow to one or more HBG target (HBT) system components.