Air Conditioner Compressor Pressure Control for Multi-Unit Reliability
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Solution Overview
Problem
Air conditioning systems with a single outdoor unit connected to multiple indoor units face challenges in efficiently managing refrigerant flow and compressor load, particularly in high temperature regions, where existing technologies may lead to compressor performance degradation and reduced reliability.
Innovation Solution
The air conditioner adjusts refrigerant flow rate by regulating indoor unit air flow based on compressor pressure range, using sensors to detect suction and discharge pressures and control the air flow to maintain the compressor within a protective pressure range, thereby preventing degradation and ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air conditioner increases refrigerant flow rate to meet high indoor loads, then cooling capacity is improved, but compressor pressure exceeds protection control range leading to performance degradation
Solution Approach 1:
The control device continuously monitors compressor suction and discharge pressures, compares them against predefined protection control ranges, and dynamically adjusts indoor unit air flow based on feedback signals. When pressure exceeds the protection range, the system automatically reduces air flow to decrease refrigerant flow rate and bring pressure back within safe operating limits, preventing compressor degradation while maintaining cooling capacity within acceptable ranges.
Solution Approach 2:
The system dynamically adjusts the air flow of indoor units based on real-time compressor pressure conditions. Rather than using fixed air flow settings, the control device modifies air flow rates adaptively - increasing air flow when compressor pressure is within protection control range to meet cooling demands, and decreasing air flow when pressure approaches dangerous levels, thereby optimizing both cooling performance and compressor reliability under varying load conditions.
2Productivity
If the air conditioner operates at high refrigerant flow rate continuously, then cooling demand is met, but compressor operates in high temperature region causing performance degradation
Solution Approach 1:
The control device uses feedback from temperature sensors monitoring compressor operating conditions to detect when the compressor operates in high temperature regions. When high temperature is detected, the system responds by reducing air flow of indoor units, which decreases refrigerant flow rate and reduces the thermal load on the compressor, thereby preventing performance degradation while still meeting cooling demands within safe operating parameters.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting air flow rates based on compressor temperature and pressure conditions. When the compressor operates in high temperature regions, the control device modifies the air flow parameter to reduce refrigerant mass flow rate, which directly lowers the thermal load and operating temperature of the compressor, preventing performance degradation while maintaining adequate cooling capacity.
3Area of stationary object
If the air conditioner uses a single outdoor unit connected to multiple indoor units, then space efficiency is improved, but refrigerant flow management becomes complex leading to compressor load issues
Solution Approach 1:
The control device performs multiple functions through a single integrated system: it monitors refrigerant pressures, calculates required refrigerant flow rates, determines optimal air flow settings for each indoor unit, and executes protective control actions. This multi-functional approach simplifies the overall system architecture compared to having separate control mechanisms for each function, thereby managing refrigerant flow complexity while maintaining the space-efficient multi-unit configuration.
Solution Approach 2:
The system implements comprehensive feedback control that monitors the actual refrigerant flow conditions resulting from multiple indoor units operating simultaneously. Based on this feedback, the control device dynamically adjusts air flow rates of individual indoor units to maintain optimal refrigerant flow distribution, preventing compressor overload while enabling flexible operation of multiple indoor units connected to a single outdoor unit.
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 enhances compressor reliability and extends the operating range of the air conditioning system, improving user satisfaction by actively managing compressor performance even under high temperature conditions.
Implementation Method 1
a compressor 111, a four-way valve 112, an outdoor heat exchanger 113
Implementation Method 2
an outdoor heat exchanger 113, an outdoor fan 114
Implementation Method 3
Refrigerant fluid absorbs surrounding heat during evaporation
Implementation Method 4
the property that refrigerant gas discharges heat during liquefaction
Data Source
Figure 1
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Figure 3
AI summary
The present disclosure provides an air conditioner. The air conditioner includes a compressor; a sensor for measuring the compressor's state configured to detect compressor state information that includes at least one of a pressure value and a saturation temperature of the compressor; and a controller configured to control air flow on the side of an indoor unit by comparing the compressor state information measured from the sensor and a threshold.