Refrigerant Supercooling Control in Multi-Unit Air Conditioning
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Solution Overview
Problem
Conventional air conditioning systems face issues with pressure loss and noise due to improper control of the supercooling expansion device, leading to insufficient refrigerant degree of supercooling and abnormal refrigerant states, which affect thermal efficiency and cause noise in indoor units.
Innovation Solution
Incorporating a supercooling heat exchanger and expansion device in the distribution unit, along with temperature and pressure sensors, to accurately control the degree of supercooling of liquid refrigerant, preventing conversion to gaseous state and ensuring efficient refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the liquid pipe length is increased to supply refrigerant to multiple indoor units, then the coverage area is improved, but pressure loss increases causing refrigerant to convert to gaseous state and generate noise
Solution Approach 1:
The supercooling expansion device performs preliminary expansion of liquid refrigerant before it enters the long liquid pipe. By reducing the refrigerant temperature and increasing its degree of supercooling in advance, the system compensates for the pressure loss that will occur during transport through the extended liquid pipe, preventing flash gas formation and noise at indoor units.
Solution Approach 2:
The system changes the temperature parameter of the liquid refrigerant by introducing it to the supercooling expansion device, which lowers the temperature and increases the degree of supercooling. This parameter change allows the refrigerant to withstand the pressure loss in longer pipes without converting to gaseous state.
2Stability of the object's composition
If the degree of supercooling is increased to prevent flash gas, then refrigerant flow stability is improved, but the risk of refrigerant shortage at indoor units increases
Solution Approach 1:
The supercooling expansion device operates with feedback control based on the actual degree of supercooling of the liquid refrigerant. The controller adjusts the expansion device opening degree according to measured supercooling values, automatically balancing between maintaining sufficient supercooling to prevent flash gas and avoiding excessive supercooling that would cause refrigerant shortage at indoor units.
3Quantity of substance
If the supercooling expansion device opening degree is increased to supply more refrigerant, then refrigerant quantity is improved, but the degree of supercooling decreases causing flash gas formation
Solution Approach 1:
The opening degree of the supercooling expansion device is made dynamically adjustable rather than fixed. The controller continuously adjusts the opening degree based on real-time measurements of the refrigerant's degree of supercooling, enabling the system to optimize both refrigerant quantity and supercooling degree according to actual operating conditions.
4Measurement precision
If precise control of supercooling expansion device is implemented, then refrigerant state accuracy is improved, but system complexity increases
Solution Approach 1:
The supercooling expansion device is designed to be self-regulating through feedback from the degree of supercooling measurement. The system automatically adjusts its own operation based on measured conditions without requiring complex external control mechanisms, achieving precise refrigerant state control while minimizing additional system complexity.
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 configuration allows precise control of supercooling, preventing noise and maintaining thermal efficiency by ensuring accurate refrigerant state and flow, thus enhancing cooling and heating operations.
Implementation Method 1
a supercooling heat exchanger disposed between the liquid pipe and the indoor unit so as to supercool the liquid refrigerant flowing through the liquid pipe
Implementation Method 2
a supercooling expansion device connected to the supercooling heat exchanger to adjust an opening degree in order to increase or decrease a degree of supercooling of the liquid refrigerant
Data Source
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AI summary
The present invention relates to an air conditioning system. The present invention relates to an air conditioning system comprising one or more over-cooling heat exchangers, an over-cooling expansion device, a temperature sensor, and a pressure sensor so as to accurately measure and control a current over-cooling degree value of a fluid coolant disposed between a fluid pipe and a plurality of indoor units and flowing thereinside.