Remote Sensor Leak Detection for HVAC Refrigerant Systems
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Solution Overview
Problem
Current refrigerant leak detection systems in HVAC systems face challenges with sensitivity, selectivity, and reliability, especially in harsh environments, leading to high costs and complexity, particularly when detecting mildly flammable refrigerants with high global warming potential.
Innovation Solution
A leak detection system with a collection chamber and sensor assembly that includes a fan to induce fluid flow from the collection chamber to a sensor located remotely, allowing for accurate detection of refrigerant leaks without the need for robust sensors to withstand high temperature, humidity, and air velocity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensors are placed near indoor heat exchanger coils to detect refrigerant leaks, then leak detection capability is provided, but sensor reliability deteriorates due to exposure to high temperature, high humidity, and high air velocity
Solution Approach 1:
The sensor is extracted from the harsh indoor coil environment and relocated to a remote location where environmental conditions are more favorable. A collection chamber with ports is positioned near the indoor coil to capture refrigerant leaks, while the sensor itself is placed remotely and connected via fluid communication, isolating it from high temperature, humidity, and air velocity exposure.
Solution Approach 2:
A collection chamber acts as an intermediary between the refrigerant leak source and the sensor. The chamber captures refrigerant gas through its ports and transfers it via fluid communication to the remote sensor, enabling detection without direct exposure to harsh conditions. The intermediary protects the sensor while maintaining detection capability.
2Reliability
If sophisticated packing enclosures are used to protect sensors in harsh environments, then sensor reliability is improved, but system cost increases
Solution Approach 1:
Instead of protecting sensors with expensive sophisticated enclosures, the sensor is extracted from the harsh environment entirely. This eliminates the need for costly protective packaging while maintaining reliability through remote placement in favorable conditions.
3Reliability
If multiple sensors are deployed to ensure adequate detection coverage, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The collection chamber with multiple ports serves multiple functions: it captures refrigerant leaks from different directions, conditions the fluid flow, and directs it to a single sensor. This multi-functional design achieves comprehensive detection coverage without requiring multiple sensors, simplifying the overall system.
4Speed
If sensors are placed directly in high air velocity areas for immediate leak detection, then detection speed is improved, but sensor reliability deteriorates
Solution Approach 1:
The collection chamber serves as an intermediary that captures refrigerant gas quickly through its ports positioned in high air velocity areas, then transfers the conditioned fluid to the remote sensor. This maintains fast detection response while protecting the sensor from direct exposure to harsh high-velocity conditions.
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 provides a cost-effective, reliable, and sensitive method for detecting refrigerant leaks, reducing false positives and negatives, and is compatible with multiple refrigerants, thus addressing the limitations of existing technologies.
Implementation Method 1
a fan operable to induce fluid flow from the collection chamber into the sensor assembly
Implementation Method 2
the sensor is operable to analyze the fluid flow and detect a leak of the refrigerant from the component
Data Source
AI summary
A heating, ventilation, and air conditioning (HVAC) system, and more particularly a method of detecting and mitigating refrigerant leaks in an HVAC system is disclosed. The HVAC system includes a leak detection system for detecting a leak of the refrigerant from the refrigerant circuit. The leak detection system includes a collection chamber locatable proximate a component of the HVAC system. The leak detection system also includes a sensor assembly including an enclosure comprising a sensor and a fan. The leak detection system also includes a flowline connecting the collection chamber with the sensor assembly such that the sensor assembly may be located away from the collection chamber and the component. The fan is operable to induce fluid flow from the collection chamber into the sensor assembly and the sensor is operable to analyze the fluid flow and detect a leak of the refrigerant from the component.