Refrigerant Leak Cutoff Control for Air-Conditioning Continuity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional air-conditioning systems face challenges in balancing comfort and safety during refrigerant leakage, as existing safety measures can lead to false detections and unnecessary system shutdowns, affecting user comfort and efficiency.
Innovation Solution
An air-conditioning apparatus and system that incorporate a refrigerant leakage sensor and a controller to determine the occurrence of leakage based on both sensor detection and operating state, using a refrigerant leakage cutoff device to cut off refrigerant flow only when a valid leakage is confirmed, ensuring safety while maintaining operation when no leakage is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutoff valve is installed to cut off refrigerant flow upon leakage detection, then safety against refrigerant leakage is improved, but false detection causes unnecessary system shutdowns degrading user comfort
Solution Approach 1:
The system continuously monitors refrigerant leakage and system operating state, using feedback loops to adjust the cutoff valve operation. The controller receives real-time data from sensors and modifies system behavior accordingly, enabling dynamic response that balances safety and comfort
Solution Approach 2:
The system performs preliminary checks of the operating state before activating the cutoff valve. By anticipating potential false detections and verifying system conditions in advance, the system avoids unnecessary shutdowns while maintaining safety
Solution Approach 3:
The system transitions from static cutoff valve operation to dynamic control based on real-time conditions. The cutoff valve operation is adjusted dynamically according to the combination of leakage detection signals and operating state parameters
2Speed
If refrigerant leakage detection is triggered by sensor alone, then response speed is improved, but false detection increases leading to unnecessary shutdowns
Solution Approach 1:
The system uses feedback from multiple sensors to continuously verify leakage detection. The controller compares sensor readings with expected operating parameters, providing feedback that confirms or refutes leakage signals before triggering shutdown
Solution Approach 2:
The operating state parameters serve as an intermediary verification layer between the leakage sensor and the cutoff valve activation. This intermediary check filters out false signals while allowing genuine leakage to pass through to the response mechanism
3Reliability
If the system shuts down completely upon leakage detection, then safety is improved, but operational continuity is lost affecting productivity
Solution Approach 1:
The system segments the refrigerant circuit control, allowing selective shutdown of affected zones while maintaining operation in unaffected areas. The cutoff valve isolates specific leakage points rather than forcing complete system shutdown
Solution Approach 2:
The system dynamically adjusts the extent of shutdown based on leakage severity and location. Instead of fixed complete shutdown, the system modulates the response to maintain productivity where safe while ensuring safety where needed
Data Source
AI summary
An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a heat source heat exchanger, an expansion device, and a load heat exchanger are connected via refrigerant pipes; a refrigerant leakage sensor configured to output a refrigerant leakage detection signal indicating detection of refrigerant leakage when the refrigerant leakage sensor detects the refrigerant leakage; a refrigerant leakage cutoff device configured to cut off a flow of refrigerant when the refrigerant leakage cutoff device is set to a closed state; and a controller configured to determine whether refrigerant leakage occurs on the basis of an operating state and whether the refrigerant leakage detection signal is received from the refrigerant leakage sensor. When the controller receives the refrigerant leakage detection signal and determines, on the basis of the operating state, that the refrigerant leakage occurs, the controller is configured to set the refrigerant leakage cutoff device to the closed state.