A2L Refrigerant Leak Sensing With Blower Relay Mitigation
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Solution Overview
Problem
HVAC systems using A2L refrigerants face challenges in detecting and mitigating refrigerant leaks effectively due to the partial flammability of these gases, which poses combustion risks and contributes to global warming, necessitating a solution to safely manage and reduce refrigerant concentrations.
Innovation Solution
A system with a leak mitigation controller that includes a sensor to measure refrigerant concentration and a relay to selectively connect or disconnect power to the temperature control device or blower, activating the blower to mitigate leaks by circulating air until the concentration falls below a threshold, and remotely monitoring the frequency and duration of leaks to alert users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If refrigerant concentration is monitored and blower is activated to mitigate leaks, then combustion risk is reduced, but system complexity increases due to additional control components
Solution Approach 1:
The leak detection controller automatically monitors refrigerant concentration and triggers mitigation actions without requiring external intervention. The system self-services by using its own sensors to detect leaks and its own control outputs to activate blowers and shut down components, reducing the need for additional complex control infrastructure while maintaining safety
Solution Approach 2:
The leak detection controller integrates multiple functions into a single device: it monitors refrigerant concentration, controls relay switching, activates blowers, and shuts down HVAC components. This multi-functionality reduces overall system complexity by consolidating control tasks rather than requiring separate dedicated systems for each function
2Object-affected harmful factors
If HVAC components are disabled during leaks to prevent combustion, then safety is improved, but cooling/heating functionality is lost
Solution Approach 1:
The system implements periodic operation by temporarily disabling HVAC components only during the specific period when refrigerant concentration exceeds safety thresholds. Once the leak is mitigated and concentration returns to safe levels, the components are automatically reactivated. This periodic on/off action maintains safety during critical periods while preserving productivity during normal operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system safely disables HVAC components during leaks, activates the blower to reduce refrigerant concentration, and provides alerts for user notification, effectively managing refrigerant leaks and ensuring system safety while reducing environmental impact.
Implementation Method 1
The leak mitigation controller includes a sensor configured to measure a refrigerant concentration
Implementation Method 2
a blower configured to circulate air
Implementation Method 3
activating the blower to mitigate leaks by circulating air until the concentration falls below a threshold
Data Source
AI summary
A system for detecting and mitigating a refrigerant leak includes a temperature control device configured to transmit control signals to a component controller and a blower configured to circulate air. The system includes a leak mitigation controller electrically coupled to the temperature control device and the component controller. The leak mitigation controller directs incoming power to the temperature control device. The leak mitigation controller includes a sensor configured to measure a refrigerant concentration and a relay configured to selectively: (i) connect the temperature control device to the incoming power or (ii) connect the blower to the incoming power. The leak mitigation controller is configured to measure the refrigerant concentration with the sensor and, in response to the measured refrigerant concentration exceeding a threshold, actuate the relay to connect the blower to the incoming power.