Method for controlling cooling medium of multi-split air conditioning system
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Solution Overview
Problem
In multi-connected air conditioning systems, the circulation amount of the cooling medium is often inadequately adjusted, leading to suboptimal cooling/heating effects and potential compressor damage due to deviations from normal operating ranges, which are influenced by environmental temperature and the number of running units.
Innovation Solution
A cooling medium control method that acquires current operating values of compressor parameters, calculates deviation degrees based on standard operating ranges, and selectively adjusts the opening degree of expansion valves to maintain the compressor within specified operating ranges, ensuring stable and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cooling medium circulation amount is adjusted based on fixed pipe diameter and length calculations, then installation is simplified, but the cooling/heating effect deteriorates due to insufficient consideration of environmental temperature and running units
Solution Approach 1:
The patent applies dynamics by transitioning from fixed static cooling medium charging to dynamic adjustment through expansion valves. The expansion valves continuously modulate the cooling medium circulation amount based on real-time operating conditions (environmental temperature, number of running units), ensuring optimal cooling/heating effect while maintaining installation simplicity through automated control.
Solution Approach 2:
The patent implements feedback control by using sensors to monitor operating parameters (temperature, pressure, running units) and automatically adjusting the expansion valve opening degrees. This closed-loop feedback system ensures the cooling medium circulation amount adapts to changing environmental conditions and system load, resolving the contradiction between simple installation and reliable performance.
2Reliability
If cooling medium circulation amount is increased to improve cooling/heating effect, then cooling/heating performance is enhanced, but compressor damage risk increases due to exceeding normal operating ranges
Solution Approach 1:
The patent uses feedback control to continuously monitor compressor operating parameters and adjust the cooling medium circulation amount accordingly. When parameters approach dangerous thresholds, the system automatically reduces circulation to prevent compressor damage, while maintaining optimal circulation for cooling/heating effect under normal conditions.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the expansion valve opening degrees based on real-time operating conditions. This allows precise control of cooling medium circulation amount, ensuring it remains within safe operating ranges for the compressor while optimizing cooling/heating performance according to environmental temperature and system load.
3Object-affected harmful factors
If cooling medium circulation amount is decreased to protect compressor, then compressor safety is improved, but cooling/heating effect deteriorates
Solution Approach 1:
The patent applies dynamics by using expansion valves to continuously and dynamically adjust the cooling medium circulation amount based on real-time operating conditions. This dynamic control allows the system to maximize cooling/heating effect when compressor safety is not compromised, while rapidly reducing circulation when safety thresholds are approached, resolving the contradiction between compressor protection and system performance.
Solution Approach 2:
The patent implements parameter changes by modulating the expansion valve opening degrees to precisely control cooling medium circulation. This allows the system to maintain optimal circulation for cooling/heating effect under normal conditions while automatically reducing circulation parameters when compressor safety becomes a concern, based on monitored operating parameters.
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 method dynamically adjusts the cooling medium circulation, preventing compressor damage and ensuring stable operation by maintaining compressor parameters within normal ranges, thus enhancing the overall performance and reliability of the air conditioning system.
Implementation Method 1
an opening degree of an indoor expansion valve is adjusted during cooling, and an opening degree of an expansion valve of the outdoor unit is adjusted during heating
Implementation Method 2
it absorbs/releases heat in an indoor heat exchanger to gasify/liquefy, and in an outdoor heat exchanger, it transfers heat to the surrounding environment/absorbs heat from the surrounding environment to liquefy/gasify
Implementation Method 3
it absorbs/releases heat in an indoor heat exchanger to gasify/liquefy
Implementation Method 4
acquiring current operating values of target parameters of the compressor during the operation of the compressor
Data Source
Figure 1
AI summary
The present disclosure belongs to the technical field of air conditioning, and particularly relates to a cooling medium control method for a multi-connected air conditioning system. In order to control operating parameters of the compressor and ensure a stable and reliable operation of the air conditioning system, the cooling medium control method for a multi-connected air conditioning system proposed by the present disclosure includes: acquiring current operating values of target parameters of the compressor during the operation of the compressor; calculating deviation degrees of the target parameters of the compressor according to the current operating values of the target parameters of the compressor and standard operating ranges of the target parameters of the compressor; and selectively adjusting an opening degree of the outdoor expansion valve or the indoor expansion valve based on the deviation degrees; wherein the standard operating ranges of the target parameters are operating ranges of the target parameters specified by a normal operating state of the compressor. In the present disclosure, the opening degree of the indoor expansion valve or the outdoor expansion valve is adjusted in real time according to the operating parameters of the compressor so that the circulation amount of the cooling medium of the air conditioning system is dynamically adjusted, thus controlling the compressor to operate in a normal range and ensuring a stable and reliable operation of the system.