Liquid-Line Bubble Detection for Predictive HVACR Maintenance
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Solution Overview
Problem
HVACR systems using vapor-compression cycles face inefficiencies and malfunctions due to leaks or component failures, which are often not detected in time by periodic maintenance approaches, leading to unnecessary expenses and inefficiencies, especially in residential and smaller commercial applications.
Innovation Solution
A predictive maintenance method and apparatus with a sensor positioned between the condenser and expansion valve in the refrigerant line to detect the presence of gas bubbles, indicating maintenance needs, utilizing an emitter, detector, and controller to provide a warning indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated preventative maintenance devices with multiple temperature sensors and electrical current sensors are used, then detection accuracy of system troubles is improved, but device complexity and cost increase making it not economically feasible for residential applications
Solution Approach 1:
The patent extracts only the essential detection function needed for predictive maintenance - detecting gas phase refrigerant in the liquid line - and eliminates all other sensors and complex analysis systems. This single-purpose sensor approach achieves sufficient detection accuracy while dramatically reducing device complexity and cost for residential applications.
Solution Approach 2:
The patent employs a simple, inexpensive sensor that can be easily replaced if needed, rather than investing in a complex expensive system. The focus is on providing adequate detection capability at minimal cost, making the system economically feasible for residential HVACR applications.
2Reliability
If periodic maintenance is performed frequently to ensure system reliability, then system reliability is improved, but loss of time and expense increase making it time consuming and expensive
Solution Approach 1:
The sensor detects gas phase refrigerant presence before it indicates a catastrophic failure, providing early warning that allows planned maintenance at the optimal time. This preliminary detection eliminates the need for frequent periodic inspections while maintaining system reliability.
Solution Approach 2:
The system provides continuous feedback about system health through the sensor monitoring, enabling maintenance to be performed based on actual system conditions rather than on a fixed schedule. This feedback mechanism optimizes maintenance timing to balance reliability with minimizing maintenance time and cost.
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 solution allows for early detection of maintenance issues, reducing the need for frequent inspections and improving system efficiency by alerting competent personnel to potential problems, making it economically feasible for residential and commercial HVACR systems.
Implementation Method 1
a sensor positioned in the line at a location between the condenser and expansion valve wherein the refrigerant fluid, if the system is functioning properly, is in liquid phase. The sensor is effective to detect the presence of gas bubbles in the refrigerant fluid
Data Source
AI summary
A predictive maintenance method and apparatus for HVACR systems including a sensor capable of detecting the presence of a gaseous phase in the refrigerant fluid at a location wherein solely liquid phase should be present if the system is functioning properly.