High pressure drop control method for unit, apparatus, and air-conditioning device
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Solution Overview
Problem
Multi-connected air conditioner units installed on different floors face challenges in refrigerant circulation due to height drops, affecting system performance and requiring improved pressure control methods.
Innovation Solution
A method and device that monitor operating modes and adjust the opening degree of electronic expansion valves based on specific parameters such as evaporation/condensation temperatures, suction pressures, and superheat/subcooling degrees to optimize refrigerant circulation, reducing the adverse effects of height drops on refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If units are installed on different floors with height drop, then installation flexibility is improved, but refrigerant circulation is adversely affected due to pressure loss
Solution Approach 1:
The patent adjusts the opening degree of electronic expansion valves as a controllable parameter to compensate for pressure loss caused by height drop. By dynamically changing the valve opening degree based on detected pressure and temperature conditions, the system maintains proper refrigerant circulation despite the adverse gravitational effect of vertical installation.
Solution Approach 2:
The system employs feedback control by detecting operating parameters (pressure, temperature, superheat degree) and using this information to automatically adjust the electronic expansion valve opening degree. This closed-loop control ensures that refrigerant circulation remains optimal even when units are installed at different heights.
2Reliability
If electronic expansion valve opening degree is increased to compensate for pressure loss, then refrigerant circulation is improved, but system pressure control becomes unstable
Solution Approach 1:
The control system continuously monitors pressure and temperature parameters and adjusts the electronic expansion valve opening degree based on real-time feedback. This prevents over-correction and maintains pressure control stability while ensuring adequate refrigerant circulation compensation for height drop.
Solution Approach 2:
The patent applies partial correction by adjusting the valve opening degree only to the extent necessary to compensate for the measured pressure loss, rather than applying maximum correction. This proportional adjustment maintains system stability while effectively addressing the circulation issue.
3Reliability
If operating parameters are monitored and valve opening is adjusted dynamically, then refrigerant circulation is optimized, but control system complexity increases
Solution Approach 1:
The control system automatically monitors operating parameters and adjusts the electronic expansion valve without requiring external intervention or complex manual calibration. The system serves itself by using its own sensors and processors to maintain optimal refrigerant circulation, simplifying operation despite the enhanced functionality.
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 ensures sufficient refrigerant circulation power by adjusting intermediate pressures, enhancing system performance and flexibility during installation by maintaining optimal refrigerant flow despite height differences between indoor and outdoor units.
Implementation Method 1
High pressure drop control method for unit, apparatus, and air-conditioning device
Implementation Method 2
a superheat degree of the indoor unit determined according to the evaporation temperature of refrigerant of the indoor unit
Implementation Method 3
a subcooling degree of the indoor unit determined according to the condensation temperature of refrigerant of the indoor unit
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed are a high pressure drop control method for a unit, an apparatus, and an air-conditioning device. The method comprises: monitoring an operating mode of the unit; obtaining, according to the operating mode, corresponding operating parameters; and adjusting the opening degree of an electronic expansion valve (EEV) according to the operating parameters . In the present application, by detecting the corresponding operating parameters in different operating modes of the unit, and adjusting the opening degree of the EEV of indoor and outdoor units according to the operating parameters, an intermediate pressure of refrigerant circulation is changed, and it is ensured that a system has sufficient power to promote refrigerant circulation. The adverse effect of high drop of the indoor and outdoor units on refrigerant circulation is reduced, the performance of the unit is improved, and the flexibility of engineering installation is improved.