Air conditioning and mode switching control method thereof
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Solution Overview
Problem
When switching from heating to refrigerating mode in air conditioning systems, a large amount of refrigerant in the liquid storage tank can lead to high pressure and reduced refrigerant capacity in the indoor unit, resulting in poorer refrigerating performance.
Innovation Solution
A mode switching control method that adjusts the opening of the throttling element and compressor settings based on the outlet superheat degree of the liquid storage tank, reducing the throttling element opening until a preset threshold is met, and adjusts the saturation temperature corresponding to the target suction pressure to improve refrigerant capacity and pressure balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system switches from heating mode to refrigerating mode with a fixed liquid storage tank capacity, then the refrigerating mode can be started, but a large amount of refrigerant in the liquid storage tank causes high pressure and reduced refrigerant capacity in the indoor unit, leading to poorer refrigerating performance
Solution Approach 1:
The patent applies dynamics by making the liquid storage tank capacity adjustable rather than fixed. The control method dynamically changes the effective storage capacity of the liquid storage tank based on operating conditions (heating vs. refrigerating mode), allowing the system to adapt refrigerant distribution to different operational requirements and resolve the conflict between mode switching capability and refrigerating performance
Solution Approach 2:
The patent changes the parameter of liquid storage tank capacity from a fixed value to a variable parameter that can be adjusted based on system needs. By modifying the effective storage capacity parameter according to operating mode, the system optimizes refrigerant distribution to maintain reliable refrigerating performance while preserving mode switching versatility
2Ease of operation
If the opening of the throttling element is large during refrigerating and oil returning mode, then oil return speed is improved, but a large amount of refrigerant returns to the liquid storage tank causing high pressure issues
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the liquid storage tank capacity based on the operating mode. During refrigerating and oil returning mode, the system configures the liquid storage tank with appropriate capacity to handle the increased refrigerant return while preventing excessive pressure buildup, thus maintaining both oil return efficiency and pressure control
Solution Approach 2:
The control method uses feedback by monitoring system conditions and adjusting the liquid storage tank capacity accordingly. When detecting refrigerating and oil returning mode operation, the system modifies the storage tank configuration to accommodate the refrigerant flow patterns, creating a closed-loop control that balances oil return efficiency with pressure management
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 enhances the throttling effect and refrigerant capacity in the indoor unit by achieving a lower pressure and improved temperature difference in heat exchange, resulting in better refrigerating performance when switching to the refrigerating mode.
Implementation Method 1
throttling effect is improved by turning down the opening of the throttling element, such that a lower pressure is obtained
Implementation Method 2
temperature difference in heat exchange and refrigerant capacity in heat exchange are improved
Implementation Method 3
temperature difference in heat exchange and refrigerant capacity in heat exchange are improved
Implementation Method 4
a low-pressure side of the outdoor unit is used as an evaporator
Implementation Method 5
a low-pressure side of the outdoor unit is used as an evaporator
Implementation Method 6
refrigerant is condensed in the outdoor condenser
Implementation Method 7
refrigerant is condensed in the outdoor condenser
Data Source
AI summary
Provided are an air conditioner and a mode switching control method thereof. The air conditioner comprises an outdoor unit and an indoor unit. One end of the outdoor unit is connected to one end of the indoor unit via a throttling element, and the other end of the indoor unit is connected to the other end of the outdoor unit via a liquid storage tank. The mode switching control method comprises the following steps: when the indoor unit switches to a refrigeration mode, acquiring an outlet superheat degree of the liquid storage tank, and determining whether the outlet superheat degree is less than a first preset value; and if the outlet superheat degree is less than the first preset value, controlling to turn down the throttling element until the outlet superheat degree is greater than a second preset value that is greater than the first preset value.