Three-pipe multi-split air-conditioning system and control method thereof
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Solution Overview
Problem
Current multi-split hot water systems face issues with refrigerant throttling and supercooling, leading to condensate water formation and safety risks, as well as inadequate heat dissipation in the compressor frequency conversion module, which can result in high temperatures and reliability concerns.
Innovation Solution
A three-pipe multi-split system with specific valve configurations and sensors that optimize refrigerant flow through the system, ensuring unidirectional refrigerant flow and adequate heat dissipation, including one-way valves, temperature sensors, and electronic expansion valves to manage refrigerant flow and prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If refrigerant is throttled by electronic expansion valve for refrigeration, then refrigeration effect is improved, but refrigerant temperature becomes low causing condensate water formation on heat dissipation module
Solution Approach 1:
The patent segments the refrigerant flow path by introducing a refrigerant reversing module with multiple one-way valves, creating separate flow paths for different operational modes. This allows the system to route refrigerant through different components (heat dissipation module vs. plate heat exchanger) based on operational requirements, preventing unwanted condensation while maintaining refrigeration effectiveness.
Solution Approach 2:
The refrigerant reversing module acts as an intermediary device that controls and directs refrigerant flow between different components. By using one-way valves and reversing mechanisms, it mediates the refrigerant's path to ensure it flows through the plate heat exchanger during refrigeration mode, preventing condensation on the heat dissipation module while maintaining the desired refrigeration effect.
2Loss of energy
If refrigerant flows through plate heat exchanger for heat dissipation, then heat dissipation is improved, but refrigerant temperature becomes low causing condensate water formation
Solution Approach 1:
The system dynamically adjusts refrigerant flow paths based on operational mode using the refrigerant reversing module. During heating mode, the module directs refrigerant through the plate heat exchanger for heat dissipation, while during refrigeration mode, it redirects flow to prevent condensation on the heat dissipation module. This dynamic control optimizes heat dissipation efficiency while preventing condensate formation.
3Loss of energy
If outdoor unit heat exchanger is switched off, then energy saving is improved, but compressor frequency conversion module cannot achieve sufficient heat dissipation causing high temperature
Solution Approach 1:
The heat dissipation module serves multiple functions: it acts as a refrigerant heat dissipation component when the outdoor unit heat exchanger is operating, and as a compressor frequency conversion module heat dissipation component when the outdoor unit is switched off. This multi-functionality allows the system to save energy by turning off the outdoor unit while ensuring the compressor module continues to dissipate heat effectively through the heat dissipation module.
4Loss of energy
If refrigerant flow through heat dissipation module is increased for heat dissipation, then heat dissipation is improved, but refrigerant temperature becomes low causing condensation risk
Solution Approach 1:
The system employs a feedback control mechanism using temperature sensors to monitor refrigerant temperature and system operational state. Based on the detected temperature and mode of operation, the control module adjusts the refrigerant reversing module to direct refrigerant flow appropriately, ensuring sufficient heat dissipation while preventing condensation by maintaining refrigerant temperature above dew point.
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 prevents refrigerant throttling and supercooling, reducing the risk of condensate formation and ensuring effective heat dissipation, thereby protecting the compressor frequency conversion module and improving system reliability.
Implementation Method 1
the refrigerant flowing through a refrigerant heat dissipation module
Implementation Method 2
refrigerant heat dissipation occurs after electronic expansion during refrigeration
Implementation Method 3
a plate heat exchanger communicated with the second electronic expansion valve
Implementation Method 4
refrigerant throttling and supercooling, leading to condensate water formation
Implementation Method 5
an outdoor unit comprising a compressor
Implementation Method 6
condensate water is easily produced on the surface of the refrigerant heat dissipation module
Data Source
AI summary
A three-pipe, multi-split system and a control method thereof. The three-pipe multi-split system includes an outdoor unit, a multi-split indoor unit, and a hydraulic module. By optimizing a refrigerant system, the phenomenon that a refrigerant is throttled before flowing through a refrigerant heat dissipation module or supercooled when passing through a plate heat exchanger which causes a relatively low temperature of the refrigerant entering the refrigerant heat dissipation module and consequent condensation on the refrigerant heat dissipation module to produce condensate water and then causes a damage to a compressor frequency conversion module can be avoided. In addition, more refrigerant is caused to flow through the refrigerant heat dissipation module to reduce the temperature of the module.