HVAC Refrigerant Charge Loss Detection Using Temperature Sensors
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Solution Overview
Problem
HVAC systems face challenges in automatically detecting a loss of refrigerant charge, which is typically identified by service technicians using expensive equipment and time-consuming procedures, often only when the system has depleted by 7-10% of its capacity.
Innovation Solution
Implementing a method and system that uses a controller to receive temperature values from multiple sensors within the HVAC system, calculating temperature-dependent values, and transmitting a notification when a predetermined temperature threshold is exceeded, indicating a low refrigerant charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If service technicians use expensive equipment and time-consuming procedures to detect refrigerant charge loss, then measurement precision is improved, but loss of time and loss of substance increase
Solution Approach 1:
The HVAC system performs self-diagnosis by automatically monitoring its own refrigerant charge status through temperature sensors and controller-based algorithms, eliminating the need for external technicians and expensive detection equipment
Solution Approach 2:
The patent replaces mechanical detection methods (pressure gauges, manual measurements) with an electronic sensor-based system that uses temperature monitoring and computational algorithms to detect refrigerant charge loss
2Measurement precision
If service technicians use expensive equipment to detect refrigerant charge loss, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses existing temperature sensors already present in the HVAC system for their primary function, copying their use for refrigerant charge detection, rather than adding specialized expensive detection equipment
Solution Approach 2:
The temperature sensors and controller perform multiple functions: standard HVAC temperature monitoring and refrigerant charge detection, eliminating the need for separate specialized detection devices
3Reliability
If traditional methods are used to detect refrigerant charge loss, then detection is only possible when depleted by 7-10%, but loss of time increases
Solution Approach 1:
The system continuously monitors temperature differential trends and calculates refrigerant charge status in advance, enabling early detection before significant depletion occurs rather than waiting for 7-10% loss
Data Source
AI summary
A method of determining loss of refrigerant charge in a heating, ventilation, and air conditioning (HVAC) system. The method includes receiving, using a controller, a plurality of temperature values from a plurality of temperature sensors placed at multiple locations within the HVAC system and calculating, using the controller using the plurality of temperature values, a plurality of temperature-dependent values. The method further includes determining, using the controller, whether a first temperature-dependent value of the plurality of temperature-dependent values is above a first predetermined temperature value and responsive to a determination that the first temperature-dependent value is above the first predetermined temperature value, transmitting, using the controller to a user interface, a notification indicating that the HVAC system is operating with low refrigerant charge.