Systems for detecting and positioning of reversing valve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reversing valves in HVAC systems often fail to fully shift positions due to insufficient refrigerant pressure and mass flow, leading to inefficient operations, as traditional monitoring methods like temperature and air flow are not accurate or efficient for determining the internal slider's position.
Innovation Solution
A system that includes a reversing valve with an internal slider and a controller that adjusts compressor operations based on pressure differential and compressor motor parameters to ensure the slider is in the correct position, enhancing refrigerant flow by increasing mass flow and pressure when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods (temperature and air flow) are used to determine reversing valve position, then the system can operate with simple monitoring, but the position determination is inaccurate and inefficient
Solution Approach 1:
The patent replaces traditional mechanical/thermal monitoring methods (temperature and air flow sensors) with an electrical parameter-based detection system. The controller monitors compressor operating parameters (current, voltage, power) to indirectly determine reversing valve position, substituting direct mechanical observation with electrical field-based measurement that provides higher precision without significant system complexity increase.
Solution Approach 2:
The patent introduces compressor operating parameters as an intermediary variable to determine reversing valve position. Instead of directly monitoring the valve's mechanical position, the system uses the compressor's electrical parameters (which change based on refrigerant flow conditions) as a mediator to infer the valve's internal slider position, enabling accurate indirect measurement.
2Use of energy by moving object
If compressor speed is reduced to low stages, then energy consumption decreases, but refrigerant pressure and mass flow become insufficient to fully shift the reversing valve slider
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors compressor operating parameters to detect the reversing valve's slider position. When the slider is not fully shifted (detected through electrical parameter analysis), the controller provides feedback to adjust compressor operation, ensuring reliable valve positioning even at low compressor speeds by compensating for insufficient refrigerant pressure through controlled parameter adjustments.
Solution Approach 2:
The patent changes the detection parameter from direct mechanical position measurement to electrical parameter monitoring (compressor current, voltage, power). This parameter change allows the system to detect valve position indirectly through electrical characteristics that change with refrigerant flow conditions, enabling reliable position determination across all compressor speed ranges including low-speed operation.
3Stress or pressure
If the reversing valve slider does not fully shift position, then the system can operate with lower refrigerant pressure requirements, but the HVAC system efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the controller proactively monitor compressor operating parameters to detect incomplete slider shifting before it significantly impacts system efficiency. The system takes preliminary corrective action by adjusting compressor parameters to ensure proper valve positioning, preventing efficiency deterioration rather than reacting after performance degradation occurs.
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 approach allows for faster and more accurate determination of the internal slider's position, improving the efficiency of HVAC systems by ensuring proper refrigerant circulation, even at low compressor speeds or stages.
Implementation Method 1
The compressor is configured to pressurize a refrigerant flowing through a refrigerant circuit of the heating and cooling system
Implementation Method 2
The reversing valve is configured to adjust flow of the refrigerant through the refrigerant circuit, where the reversing valve includes a first configuration to direct the refrigerant through the first flow path and a second configuration to direct the refrigerant through the second flow path
Implementation Method 3
The controller is configured to determine a pressure differential and/or determine an operating parameter of a motor coupled to a compressor, where the controller is configured to adjust operation of the compressor based on the pressure differential and/or the operating parameter to adjust the internal slider of the reversing valve
Data Source
AI summary
A heating and cooling system includes a reversing valve configured to adjust a flow of refrigerant through the heating and cooling system, where the reversing valve includes a first configuration to flow the refrigerant through a first circuit of the heating and cooling system and a second configuration to flow the refrigerant through a second circuit of the heating and cooling system. The heating and cooling system also includes a controller configured to determine an operating parameter of a compressor of the heating and cooling system, where the controller is configured to adjust operation of the compressor based on the operating parameter to adjust a position of the reversing valve.