Multi-split system and method for controlling heating throttling element thereof
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Solution Overview
Problem
Multi-split air conditioning systems face challenges in maintaining energy efficiency and user experience, particularly during partial load heating, due to inadequate control of the heating throttling element, which affects refrigerant flow and condensation temperature.
Innovation Solution
The method involves adjusting the opening of the heating throttling element based on the pressure difference between high and intermediate pressures in the shunt device, using sensors to control the compressor and calculate target pressure differences, ensuring stable operation and optimal refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the opening of the heating throttling element is increased to improve refrigerant flow and heating capacity, then heating performance is improved, but liquid discharge requirements may not be met and system stability deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the opening degree of the heating throttling element is dynamically adjusted based on real-time detection of high-pressure and intermediate-pressure values. The control method calculates the pressure difference and compares it with a preset threshold to automatically adjust the throttling element opening, ensuring the system maintains optimal operation within stable parameters while meeting heating capacity requirements.
Solution Approach 2:
The patent transitions from a static throttling element opening to a dynamic adjustment mechanism. The opening degree of the heating throttling element is no longer fixed but is continuously adjusted based on system operating conditions (pressure difference), allowing the system to adapt to varying load conditions and maintain both heating capacity and stability across different operating scenarios.
2Productivity
If the opening of the heating throttling element is optimized for high load conditions, then heating capacity is improved, but performance during partial load heating deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the heating throttling element opening based on real-time pressure difference detection. This allows the system to adapt to different load conditions automatically - during partial load, the pressure difference changes trigger appropriate opening adjustments that optimize refrigerant flow and maintain heating capacity, whereas a fixed opening would be suboptimal for varying conditions.
Solution Approach 2:
The patent changes the operating parameters (opening degree of heating throttling element) based on system conditions. By monitoring pressure difference and adjusting the throttling element opening accordingly, the system optimizes refrigerant flow characteristics for different load conditions, improving adaptability across the full operating range from partial to full load.
3Quantity of substance
If the heating throttling element opening is increased to meet liquid discharge requirements, then refrigerant flow is improved, but condensation temperature control and energy efficiency deteriorate
Solution Approach 1:
The patent uses feedback control where the opening of the heating throttling element is adjusted based on detected pressure values. This closed-loop control ensures that refrigerant flow is optimized for liquid discharge while simultaneously maintaining proper condensation temperature, as the system responds to actual operating conditions rather than using a fixed opening that cannot balance both requirements.
Solution Approach 2:
The patent dynamically changes the throttling element opening parameter based on system conditions. By adjusting this parameter in response to pressure difference measurements, the system optimizes both refrigerant flow quantity and condensation temperature simultaneously, achieving a balance that fixed-parameter systems cannot accomplish.
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 approach enhances energy efficiency and user experience by maintaining optimal refrigerant flow and condensation temperature, meeting liquid discharge requirements and improving system performance during heating, especially under partial load conditions.
Implementation Method 1
the opening of the heating throttling element is adjusted by the pressure difference between the high pressure and the intermediate pressure of the shunt device
Implementation Method 2
it expands into the low-pressure gas through the electronic expansion valve
Implementation Method 3
after it releases heat in the heating indoor unit
Implementation Method 4
the condensation temperature of the heating indoor unit will be adjusted
Data Source
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AI summary
A method for controlling a heating throttling element (35) in a multi-split system comprises: obtaining a target gas discharge pressure of a compressor, or a saturation temperature corresponding to the target gas discharge pressure (S1); controlling the compressor according to the target gas discharge pressure or the saturation temperature corresponding to the target gas discharge pressure to enable the compressor to operate stably, obtaining a high pressure and an intermediate pressure of a bypass device (30) after operation of the compressor becomes stable, and calculating a pressure difference between the high pressure and an intermediate pressure (S2); and obtaining a target pressure difference between the high pressure and an intermediate pressure of the bypass device (30), and adjusting an opening degree of the heating throttling element (35) according to the pressure difference and the target pressure difference. A multi-split system applying the method for controlling the heating throttling element is also disclosed.