Cooling medium control method for multi-connected 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 the circulation amount of cooling medium is adjusted based on pipe diameter and length, then the system can be installed with simple calculation, but the cooling/heating effect becomes suboptimal and compressor operation becomes unstable
Solution Approach 1:
The system implements feedback control by continuously monitoring compressor operating parameters (current, temperature, pressure) and dynamically adjusting the expansion valve opening degree to maintain optimal cooling medium circulation, thereby ensuring stable compressor operation while allowing simple initial installation
Solution Approach 2:
The system transitions from static cooling medium circulation adjustment (based on fixed pipe dimensions) to dynamic adjustment based on real-time operating conditions, allowing the expansion valve opening degree to adapt continuously to changing environmental temperature and load conditions
2Productivity
If the expansion valve opening degree is adjusted to increase cooling medium circulation, then the cooling/heating effect improves, but the compressor may exceed normal operating range and suffer damage
Solution Approach 1:
The control system continuously monitors compressor operating parameters and provides feedback to the expansion valve control, adjusting the opening degree to maintain optimal cooling medium circulation that maximizes cooling/heating effect while keeping compressor parameters within safe operating ranges
Solution Approach 2:
The system dynamically changes the expansion valve opening degree parameter based on real-time compressor operating conditions, environmental temperature, and load requirements, optimizing the balance between cooling/heating performance and compressor safety
3Reliability
If the cooling medium circulation amount is reduced, then the compressor operates within normal range, but the cooling/heating effect deteriorates
Solution Approach 1:
The system uses feedback control to continuously adjust the expansion valve opening degree based on compressor operating parameters, ensuring that cooling medium circulation is maintained at the optimal level that simultaneously ensures compressor stability and achieves effective cooling/heating performance
Data Source
AI summary
To control operating parameters of the compressor and ensure stable operation of the air conditioning system, a cooling medium control method for a multi-connected air conditioning system 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; where the standard operating ranges of the target parameters are operating ranges of the target parameters specified by a normal operating state of the compressor. Here the opening degree of the indoor expansion valve or the outdoor expansion valve is adjusted in real time according to parameters of the compressor.