Refrigeration leak detection
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Solution Overview
Problem
HVAC systems using A2L refrigerants face regulatory pressure to implement leak detection and mitigation due to increased flammability, requiring systems to ensure occupant safety and comfort while avoiding nuisance issues.
Innovation Solution
A control system with a refrigerant sensor and control module that automatically resets the system after leak mitigation, allowing it to return to normal operation, and locks out the compressor if multiple leaks occur or refrigerant levels exceed safety thresholds, ensuring safety and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic reset is implemented after leak mitigation, then system availability and comfort are improved, but safety risk may increase if leaks are not fully resolved
Solution Approach 1:
The control module continuously monitors refrigerant concentration levels and uses this feedback to determine when to reset the system. The sensor provides real-time data about leak status, and the control module adjusts system operation accordingly - only resetting when concentrations indicate the leak has been mitigated, thus maintaining safety while improving availability
Solution Approach 2:
The system performs preliminary verification of leak mitigation by monitoring refrigerant concentrations for a predetermined time period before automatically resetting. This preliminary action ensures that the leak has truly been resolved before restoring full system operation, preventing premature reset that could compromise safety
2Reliability
If compressor is locked out after multiple leaks, then safety is improved, but system productivity decreases
Solution Approach 1:
The control module dynamically adjusts system operation based on leak history and current conditions. After multiple leaks, the system transitions to a locked-out state where the compressor cannot operate, but the fan may still run in a reduced capacity mode. This dynamic response prioritizes safety while providing partial functionality, rather than a complete system shutdown
3Ease of operation
If manual reset option is provided, then user control and comfort are improved, but system complexity increases
Solution Approach 1:
The control module serves multiple functions: it automatically monitors refrigerant levels, detects leaks, mitigates leaks by controlling the fan, determines when reset conditions are met, and responds to manual reset inputs. By consolidating these diverse functions into a single control module, the system provides comprehensive functionality without proportionally increasing complexity
Data Source
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AI summary
A refrigeration system of a building includes: a compressor module configured to, in response to a determination that an amount of a refrigerant of the refrigeration system that is present outside of the refrigeration system and within the building is greater than a first predetermined amount, maintain a compressor off continuously for a predetermined period; and a fan module configured to, in response to the determination, maintain a fan on continuously for at least the predetermined period, and where the compressor module is further configured to, without receiving input indicative of a reset of the refrigeration system, after the compressor has been off for the predetermined period and the amount of refrigerant that is present outside of the refrigeration system within the building is less than a second predetermined amount, selectively turn the compressor on.