Air-conditioning device and operation control device
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Solution Overview
Problem
Air-conditioning apparatuses that reuse existing pipes face increased pressure anomalies and reliability issues during high outside air temperature environments due to reduced indoor unit load capacity, leading to higher refrigerant pressures exceeding the pressure-withstanding reference value.
Innovation Solution
The air-conditioning apparatus adjusts the opening degree of the heat source-side pressure reducing device based on the reduction in total load capacity to maintain refrigerant pressure within the pressure-withstanding reference value, using a controller to manage the compressor frequency and solenoid valve operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the load capacity of indoor units is reduced during cooling operation in high outside air temperature environment, then the cooling demand is matched to actual load, but the refrigerant pressure in existing pipes increases and may exceed the pressure-withstanding reference value
Solution Approach 1:
The control device continuously monitors the total load capacity of indoor units and dynamically adjusts the opening degree of the heat source-side pressure reducing device based on this feedback. When load capacity decreases, the control device reduces the opening degree to maintain refrigerant pressure within safe limits, preventing abnormal stops while adapting to actual cooling demands
Solution Approach 2:
The invention changes the opening degree parameter of the heat source-side pressure reducing device in response to load capacity changes. By adjusting this parameter dynamically based on actual load conditions, the system maintains pressure within acceptable ranges while optimizing cooling performance for varying load requirements
2Reliability
If the opening degree of heat source-side pressure reducing device is adjusted according to load capacity reduction, then refrigerant pressure is controlled to remain at or below the pressure-withstanding reference value, but the system complexity increases
Solution Approach 1:
The control device automatically monitors load capacity changes and self-adjusts the opening degree of the pressure reducing device without requiring manual intervention. The system serves itself by detecting pressure trends and autonomously modifying valve opening to maintain safe operating parameters, reducing the need for complex external control mechanisms
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 reduces the frequency of abnormal stops caused by pressure anomalies, ensuring a reliable air-conditioning system by controlling refrigerant pressure and maintaining system stability during high outside air temperature conditions.
Implementation Method 1
a heat source-side pressure reducing device 4, which reduces a pressure of the refrigerant
Data Source
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AI summary
An air-conditioning apparatus (1) includes a controller (500) (operation control device). During a cooling operation, when an outside air temperature of outdoor air supplied to a heat source-side heat exchanger (3) exceeds a reference outside air temperature, and when a total load capacity of at least one load-side unit (first load-side unit 200a and/or second load-side unit 200b) is reduced over time, the controller (500) (operation control device) adjusts an opening degree of a pressure reducing device (heat source-side pressure reducing device 4) in accordance with a reduction amount of the total load capacity.