Refrigerant Leak Detection Using Tubing and Active Air Sampling
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Solution Overview
Problem
Current refrigerant leak detection systems in HVAC systems suffer from slow detection times and require multiple sensors, which are costly and impractical for large systems, and are prone to damage from liquid droplets during defrost operations.
Innovation Solution
A tubing system with fans and sensors positioned throughout the HVAC system to actively draw air samples, reducing the need for multiple sensors and minimizing sensor degradation from liquid droplets, allowing for faster detection of refrigerant leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sensor is placed far away from the refrigerant leakage location, then the system structure is simpler, but the detection time increases significantly
Solution Approach 1:
The patent uses a blower to create airflow that actively transports refrigerant vapor from the leakage source to the sensor through ducts. This pneumatic transport system allows the sensor to be positioned away from the leakage point while maintaining fast detection, resolving the contradiction between simple structure and fast detection.
Solution Approach 2:
The patent introduces airflow as an intermediary medium to carry refrigerant vapor from the leakage location to the sensor. This mediator enables the sensor to detect leaks remotely without being positioned directly at the leakage point, reducing structural complexity while maintaining detection speed.
2Reliability
If multiple sensors are deployed at different locations, then the detection coverage is improved, but the system cost and complexity increase excessively
Solution Approach 1:
The blower-driven airflow system acts as a virtual extension of the sensor's detection range, allowing a single sensor to monitor multiple locations by actively sampling air from different zones. This eliminates the need for multiple physical sensors while maintaining comprehensive coverage.
Solution Approach 2:
The single sensor system, enhanced by the blower and duct network, performs the function of multiple distributed sensors. The airflow system enables one sensor to sample from multiple locations, making the sensor system universal and multi-functional.
3Ease of operation
If sensors are exposed to liquid droplets during defrost operations, then the detection function is maintained, but the sensor reliability decreases due to damage
Solution Approach 1:
The airflow system acts as an intermediary that selectively transports refrigerant vapor to the sensor while excluding liquid droplets. The airflow velocity and direction control allow vapor to be carried to the sensor while larger liquid droplets are filtered out by inertia, protecting the sensor from damage.
Solution Approach 2:
The sensor environment is created with different local qualities - the airflow stream carries vapor efficiently while creating a protective effect against liquid droplets. The local airflow conditions around the sensor differ from the general environment, providing selective sampling and protection.
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 reduces detection time and sensor requirements, enhances leak response, and minimizes sensor damage, improving safety and efficiency in refrigerant leak detection.
Implementation Method 1
The fan is located downstream of the one or more tubes. The fan is configured to pull sampled air through the tubing system and direct the sampled air toward the sensor circuitry
Implementation Method 2
The sensor circuitry is configured to detect refrigerant... If there is a refrigerant leakage, air that is mixed with refrigerant particles is pulled into a hole in the tube
Data Source
AI summary
A refrigeration system includes a tubing system, a sensor circuitry, a fan, and a controller. The tubing system has tubes located adjacent to component of the refrigeration system. The tubes have holes on their surface. The fan causes sampled air to flow through the tubes and to flow the sampled air toward the sensor circuitry. The controller receives a signal that indicates that the sampled air comprises a mixture of air and refrigerant particles. In response to receiving the signal, the controller determines that there is a refrigerant leak associated with at least one of the one or more components.