Method for controlling variable refrigerant flow air conditioner, variable refrigerant flow air conditioner, and storage medium
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Solution Overview
Problem
Variable refrigerant flow (VRF) air conditioners face inefficiencies when using a fixed superheat degree to control indoor units in the warming stage, leading to mismatched operation requirements and unnecessary energy consumption.
Innovation Solution
A method to control VRF air conditioners by determining a target superheat degree based on working condition parameters, adjusting the operating parameters of the electronic expansion valve, and optimizing the compressor frequency to match the actual operation requirements of indoor units during the warming stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed superheat degree is used to control indoor units in the warming stage, then the control method is simple, but the superheat degree does not match the actual operation requirements of the indoor units
Solution Approach 1:
The patent implements dynamic superheat degree adjustment by switching between different superheat degree settings based on the operating stage of indoor units. The system dynamically identifies whether indoor units are in cooling stage or warming stage, and applies appropriate superheat degrees (first superheat degree for cooling stage, second superheat degree for warming stage), thereby making the control system adaptive to changing operational conditions while maintaining reasonable complexity.
Solution Approach 2:
The patent changes the superheat degree parameter based on the operating stage of indoor units. By detecting the operating stage (cooling or warming) and adjusting the superheat degree parameter accordingly, the system optimizes the matching between superheat degree and actual operation requirements, improving energy efficiency and system performance.
2Device complexity
If a fixed superheat degree is used for indoor units in the warming stage, then the control system is simple, but excessive cooling capacity is output leading to energy waste
Solution Approach 1:
The system dynamically adjusts the superheat degree based on the operating stage detection, switching from a fixed control approach to a dynamic adaptive approach. This prevents excessive cooling capacity output in the warming stage by applying an appropriate second superheat degree that matches the reduced cooling demand, thereby reducing energy waste while maintaining manageable system complexity.
Solution Approach 2:
The patent changes the superheat degree parameter according to the operating stage to prevent excessive cooling capacity output. By implementing parameter changes (superheat degree adjustment) based on detected operating conditions, the system optimizes energy efficiency and reduces energy waste from unnecessary cooling while keeping the control system relatively simple.
3Ease of operation
If the same superheat degree is applied to all indoor units regardless of operating stage, then the control approach is uniform and simple, but it does not match the different operation requirements of indoor units in different stages
Solution Approach 1:
The patent segments the control approach by dividing indoor units into different groups based on their operating stages. Instead of applying a uniform superheat degree to all units, the system identifies and separately controls indoor units in cooling stage versus those in warming stage, applying different superheat degrees to each segment. This segmented control strategy improves adaptability to different operation requirements while maintaining relatively simple control logic.
Solution Approach 2:
The patent applies different superheat degree settings to different local groups of indoor units based on their specific operating stages. Rather than using a single uniform parameter for all units, the system tailors the superheat degree parameter to the local conditions of each group (cooling stage units receive first superheat degree, warming stage units receive second superheat degree), thereby improving operation requirement matching while keeping the overall control approach manageable.
Data Source
AI summary
Disclosed are a method for controlling a variable refrigerant flow (VRF) air conditioner, a VRF air conditioner, and a computer-readable storage medium. The method includes: obtaining a target indoor unit in a warming stage among started indoor units; determining a target superheat degree according to a working condition parameter of the target indoor unit; and adjusting an operating parameter of an electronic expansion valve of the target indoor unit according to the target superheat degree.