Multi-Compressor Air Conditioning for Variable Compression Stages
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Solution Overview
Problem
Conventional air conditioners have limited compressor operation efficiency due to three-stage compression, which restricts their performance in meeting varying load conditions.
Innovation Solution
The air conditioner employs multiple compressors that operate in parallel or series modes, with a refrigerant separation device and supercooling heat exchangers to manage refrigerant flow and compression stages, allowing for three-stage or five-stage compression depending on the operational load, thereby optimizing refrigeration ability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If three-stage compression is used in the compressor, then the device complexity is reduced, but the compressor operation efficiency is limited
Solution Approach 1:
The compression system is segmented into multiple independent compressors (first compressor and second compressor) that can operate independently or in combination. Each compressor can perform three-stage compression, and when operated together in series mode, they achieve five-stage compression, thereby increasing overall efficiency without requiring a single complex multi-stage compressor
2Productivity
If multiple compressors are added to enable parallel or series operation, then the refrigeration efficiency is improved, but the device complexity increases
Solution Approach 1:
The first and second compressors are designed with multi-functionality, capable of operating in three modes: parallel operation (both compressors working simultaneously on separate refrigerant streams), series operation (refrigerant passing through both compressors sequentially for five-stage compression), and individual operation (either compressor working alone). This universality allows the system to adapt to different load conditions without requiring fundamentally different hardware configurations
Solution Approach 2:
The system incorporates dynamic control through a valve device that can switch refrigerant flow paths between different compression modes. The valve device dynamically adjusts whether refrigerant flows through the first compressor only, or through both first and second compressors in series, enabling the system to optimize performance based on real-time load conditions while managing the complexity of multiple compressors
3Productivity
If five-stage compression is implemented through series operation, then the compressor operation efficiency is improved, but the device complexity and control difficulty increase
Solution Approach 1:
A valve device acts as an intermediary control element that manages refrigerant flow between the first and second compressors. This valve device simplifies the control of five-stage compression by automatically directing refrigerant through the appropriate compression path (parallel or series) based on system conditions, reducing the complexity of coordinating multiple compressors without sacrificing the efficiency benefits of five-stage compression
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 configuration enhances the air conditioner's ability to handle high and low load conditions by adjusting compression stages, improving refrigeration efficiency and power usage, and allowing for optimal operation based on the load mode.
Implementation Method 1
first and second compressors capable of performing multi-stage compression
Implementation Method 2
a condenser for condensing a refrigerant compressed in the first and second compressors
Implementation Method 3
a refrigerant separation device for separating the refrigerant to be injected to the first or second compressor of the refrigerant condensed in the condenser
Implementation Method 4
a main expansion device disposed at an outlet-side of the refrigerant separation device to decompress the refrigerant
Implementation Method 5
an evaporator for evaporating the refrigerant decompressed in the main expansion device
Data Source
AI summary
An air conditioner and a method of controlling the same are provided. The air conditioner includes first and second compressors capable of performing multi-stage compression, a condenser for condensing a refrigerant compressed in the first and second compressors, a refrigerant separation device for separating the refrigerant to be injected to the first or second compressor of the refrigerant condensed in the condenser, injection tubes extending from the refrigerant separation device to the first and second compressors to guide injection of the refrigerant, a main expansion device disposed at an outlet-side of the refrigerant separation device to decompress the refrigerant, an evaporator for evaporating the refrigerant decompressed in the main expansion device, a valve device disposed at an outlet-side of the first compressor to guide the refrigerant compressed in the first compressor to the condenser or the second compressor, and a bypass tube extending from the valve device to an suction-side of the second compressor.