HVAC system with leak detection and method of use
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
HVAC systems need to transition to using low global warming potential (GWP) refrigerants, particularly mildly flammable (A2L) refrigerants like R-32 and R-454B, requiring sensors to detect refrigerant leaks effectively.
Innovation Solution
Integration of leak detection sensors and loss of charge sensors within HVAC systems to identify the location of refrigerant leaks, utilizing a controller to analyze sensor data and determine leak locations based on concentration thresholds and wait times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional refrigerants are used in HVAC systems, then system compatibility and existing infrastructure are maintained, but global warming potential increases
Solution Approach 1:
The system changes the refrigerant parameter from traditional high-GWP refrigerants to low-GWP A2L refrigerants, requiring modifications to system components and control parameters to accommodate the new refrigerant properties while maintaining system functionality
Solution Approach 2:
Leak detection sensors and loss of charge sensors serve as intermediary devices that detect refrigerant leaks and provide feedback to the controller, enabling the system to adapt to the new refrigerant type and maintain safe operation
2Reliability
If A2L refrigerant leak detection sensors are installed, then refrigerant leak detection capability is improved, but device complexity increases
Solution Approach 1:
The controller integrates multiple functions including loss of charge detection, refrigerant leak detection, system control, and diagnostic capabilities into a single device, reducing overall system complexity while maintaining comprehensive monitoring and control functions
Solution Approach 2:
The patent combines leak detection sensors with existing loss of charge sensors and integrates their functions through a unified controller, merging multiple detection capabilities into a coordinated system that simplifies installation and operation
3Measurement precision
If multiple sensors are integrated for leak detection, then leak location identification accuracy is improved, but device complexity increases
Solution Approach 1:
The system divides the HVAC system into multiple zones or sections with sensors strategically placed in different locations, allowing the controller to identify leak locations by analyzing which specific sensor detects the refrigerant, thereby pinpointing the leak source without requiring a complex array of sensors throughout the entire system
4Loss of energy
If refrigerant leaks are not detected quickly, then energy consumption increases due to reduced system efficiency, but detection time extends
Solution Approach 1:
The system performs preliminary detection by continuously monitoring for loss of charge conditions and refrigerant presence before significant leaks occur, allowing early intervention and preventing energy loss from undetected leaks while maintaining rapid response capability
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
Enhances leak detection accuracy, reducing energy consumption and improving operational efficiency by quickly identifying and addressing refrigerant leaks in HVAC systems.
Implementation Method 1
receive, from the first leak detection sensor after the first predetermined wait time, a measurement that is indicative of a concentration of the refrigerant in the indoor unit
Implementation Method 2
at least one loss of charge sensor configured to measure at least one loss of charge parameter of the refrigerant flowing through the HVAC system
Data Source
AI summary
A method of operating an HVAC system includes receiving a first loss of charge parameter of refrigerant from a loss of charge sensor. The method includes determining that refrigerant leak diagnostics should be performed for the HVAC system based on a comparison of the first loss of charge parameter to a loss of charge threshold. The method includes turning off a compressor in a control panel unit and a blower in an indoor unit for a predetermined wait time. The method includes receiving a measurement after the predetermined wait time that is indicative of a concentration of the refrigerant in the indoor unit from a first leak detection sensor, and receiving a measurement that is indicative of a concentration of the refrigerant in the control panel unit from a second leak detection sensor. The method includes determining a leak location of the refrigerant using a controller.