Systems and methods for detecting and responding to refrigerant leaks in heating, ventilating, and air conditioning systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
HVAC systems face challenges in detecting and responding to refrigerant leaks, which compromise system performance and increase costs, as traditional leak inspection systems are limited to the installation phase and do not effectively address leaks that occur post-installation.
Innovation Solution
The implementation of a sensor system that measures refrigerant concentration outside the refrigeration circuit, coupled with a controller that adjusts the economizer to increase the flow of environmental air relative to return air when a leak is detected, effectively removing the leaked refrigerant from the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional leak inspection systems are used during installation, then refrigerant leaks can be detected at the installation phase, but leaks occurring post-installation cannot be detected or addressed
Solution Approach 1:
The system performs preliminary leak detection during installation using traditional methods, then maintains continuous monitoring capability through the sensor system that remains active throughout the HVAC system's operational life, ensuring leaks are detected both before and after installation
Solution Approach 2:
The sensor continuously monitors refrigerant concentration and provides real-time feedback to the controller, which automatically adjusts the economizer to increase environmental air flow when leaks are detected, creating a closed-loop system that addresses leaks throughout the HVAC system's operational duration
2Reliability
If the economizer increases environmental air flow to remove leaked refrigerant, then refrigerant is removed from the system, but energy consumption increases
Solution Approach 1:
The controller continuously monitors refrigerant concentration via the sensor and dynamically adjusts the economizer position based on real-time feedback, increasing environmental air flow only when and to the extent necessary to remove detected leaks, thereby minimizing unnecessary energy consumption while maintaining effective refrigerant removal
Solution Approach 2:
The economizer is dynamically adjusted based on the severity and persistence of detected refrigerant leaks, allowing the system to optimize the balance between refrigerant removal effectiveness and energy consumption rather than operating at a fixed position
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
This solution enables reliable detection and management of refrigerant leaks, improving HVAC system performance and reducing costs by actively removing leaked refrigerant and maintaining indoor air quality.
Implementation Method 1
a sensor configured to measure a refrigerant concentration external to the refrigeration circuit
Implementation Method 2
The controller is further configured to increase a ratio of the flow of environmental air relative to a flow of return air from a conditioned interior space of a building
Data Source
AI summary
The present disclosure relates to a heating, ventilating, and air conditioning (HVAC) system that includes a refrigerant circuit and a sensor configured to measure a refrigerant concentration external to the refrigeration circuit. The HVAC system also includes a controller that is communicatively coupled to the sensor and to an economizer. The controller is configured to control a flow of environmental air into the HVAC system. The controller is further configured to increase a ratio of the flow of environmental air relative to a flow of return air from a conditioned interior space of a building when the sensor measures the refrigerant concentration above a predetermined threshold concentration.