Method and device for controlling refrigerator in air conditioning system and air conditioning system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In air conditioning systems with multiple outdoor units connected in parallel, uneven refrigerant distribution leads to varying compressor overheat degrees, causing inefficiencies and potential damage due to excessive or insufficient heat dissipation, which existing adjustment methods fail to address effectively from a systemic perspective.
Innovation Solution
A method and device that utilize temperature sensors and a processor to compare the overheat degree of each outdoor unit with an average overheat degree, adjusting the refrigerant amount by increasing or decreasing it through electronic expansion valves based on preset differences, ensuring proper compressor operation and uniform heat dissipation across units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant distribution is adjusted for each outdoor unit independently, then local overheat degree can be controlled, but system-wide refrigerant distribution remains uneven
Solution Approach 1:
The system implements feedback control by continuously monitoring the overheat degree of each outdoor unit compressor and adjusting the refrigerant flow accordingly. The controller compares the actual overheat degree with target values and dynamically adjusts electronic expansion valves to maintain optimal temperatures, ensuring both local and system-wide reliability.
Solution Approach 2:
The system changes the refrigerant flow parameter dynamically by adjusting electronic expansion valves based on real-time overheat degree measurements. This allows the system to adapt refrigerant distribution to varying operating conditions, maintaining optimal compressor temperatures across all outdoor units while ensuring system reliability.
2Productivity
If more refrigerant is distributed to outdoor units with larger heat exchangers, then heat exchange capacity is improved, but compressor overheat degree becomes too high
Solution Approach 1:
The system applies local quality control by independently adjusting the refrigerant flow to each outdoor unit based on its specific characteristics (heat exchanger size, compressor capacity, operating conditions). Each outdoor unit receives a customized refrigerant amount optimized for its local requirements, preventing both overheating and insufficient cooling while maintaining optimal heat exchange capacity.
3Temperature
If less refrigerant is distributed to outdoor units with smaller heat exchangers, then compressor overheating is prevented, but heat exchange capacity is reduced
Solution Approach 1:
The system applies local quality control by independently adjusting the refrigerant flow to each outdoor unit based on its specific characteristics (heat exchanger size, compressor capacity, operating conditions). Each outdoor unit receives a customized refrigerant amount optimized for its local requirements, preventing both overheating and insufficient cooling while maintaining optimal heat exchange capacity.
4Temperature
If refrigerant amount is increased in outdoor units with high overheat degree, then compressor temperature is reduced, but refrigerant distribution uniformity decreases
Solution Approach 1:
The system implements feedback control by continuously monitoring the overheat degree of each outdoor unit compressor and adjusting the refrigerant flow accordingly. The controller compares the actual overheat degree with target values and dynamically adjusts electronic expansion valves to maintain optimal temperatures, ensuring both local and system-wide reliability.
Solution Approach 2:
The system changes the refrigerant flow parameter dynamically by adjusting electronic expansion valves based on real-time overheat degree measurements. This allows the system to adapt refrigerant distribution to varying operating conditions, maintaining optimal compressor temperatures across all outdoor units while ensuring system reliability.
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 ensures that compressors operate within a stable temperature range, preventing overheating or underheating, thereby extending compressor lifespan, improving system reliability, and maintaining optimal refrigerant distribution.
Implementation Method 1
the adjusting means is an electronic expansion valve; the adjusting means adjusts a refrigerant flow rate according to the opening degree of the expansion valve
Implementation Method 2
Less refrigeration distributed to some outdoor units may be evaporated easily in the heat exchangers of these outdoor units
Implementation Method 3
Less refrigeration distributed to some outdoor units may be evaporated easily in the heat exchangers of these outdoor units
Implementation Method 4
a compressor of each outdoor unit
Data Source
AI summary
Disclosed are a method and a device for controlling refrigerant in an air conditioning system. The method includes: S1: comparing a superheat degree of each outdoor unit with an average superheat degree; S2: if the superheat degree of a present outdoor unit is higher than the average superheat degree, and a first different between the superheat degree of the present outdoor unit and the average superheat degree is greater than a present value, increasing a refrigerant amount entered into the present outdoor unit; and S3: if the superheat degree of the present outdoor unit is lower than the average superheat degree, and a second different between the average superheat degree and the superheat degree of the present outdoor unit is greater than the present value, decreasing the refrigerant amount entered into the present outdoor unit. Therefore, the refrigerant amount entered into each outdoor unit is adjusted from systemic overall perspective.