Refrigerant Injection Layout for Stable Two-Phase Air Conditioning
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Solution Overview
Problem
Air conditioners face challenges in maintaining a desirable gas-liquid two-phase state of refrigerant in the liquid-refrigerant connection pipe due to excessive discharge temperature increases, which can disrupt refrigerant transport and efficiency.
Innovation Solution
Incorporating a liquid-pressure adjustment expansion valve in the outdoor liquid-refrigerant pipe and a liquid injection pipe that branches refrigerant to the compressor, ensuring the refrigerant remains in a gas-liquid two-phase state while suppressing discharge temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the opening degree of the indoor expansion valve is temporarily increased to decrease the discharge temperature, then the discharge temperature is reduced, but the refrigerant state in the liquid-refrigerant connection pipe varies and the desirable gas-liquid two-phase state cannot be obtained
Solution Approach 1:
The liquid injection pipe acts as an intermediary mechanism that introduces liquid refrigerant directly into the compression process. This allows temperature control without disrupting the refrigerant state in the liquid-refrigerant connection pipe, as the injection occurs at a different location and does not affect the two-phase flow stability
Solution Approach 2:
The system separates the temperature control function from the refrigerant state control function. The liquid injection pipe handles discharge temperature control independently, while the liquid-pressure adjustment expansion valve maintains the gas-liquid two-phase state in the liquid-refrigerant connection pipe, allowing both objectives to be achieved simultaneously without interference
2Reliability
If the liquid-pressure adjustment expansion valve decompresses the refrigerant to maintain gas-liquid two-phase state, then the refrigerant transport is improved, but the discharge temperature excessively increases
Solution Approach 1:
The liquid injection pipe serves as a mediator that cools the refrigerant during compression, counteracting the temperature increase caused by the liquid-pressure adjustment expansion valve. This allows the expansion valve to maintain reliable two-phase refrigerant transport while the injection pipe controls the discharge temperature
Solution Approach 2:
The system changes the physical parameters of the refrigerant at different stages: the liquid-pressure adjustment expansion valve controls pressure and phase composition for reliable transport, while the liquid injection pipe adjusts temperature by introducing liquid refrigerant, allowing independent optimization of both parameters
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 reliably maintains the refrigerant in a desirable two-phase state, preventing disruptions in refrigerant transport and enhancing the air conditioner's operational efficiency by controlling the discharge temperature.
Implementation Method 1
a liquid-pressure adjustment expansion valve that decompresses a refrigerant so that the refrigerant flowing through the liquid-refrigerant connection pipe is in a gas-liquid two-phase state
Implementation Method 2
A liquid injection pipe that branches part of the refrigerant flowing through the outdoor liquid-refrigerant pipe and feeds the branched refrigerant to the compressor
Data Source
AI summary
An air conditioner, in which a liquid-pressure adjustment expansion valve that decompresses a refrigerant so that the refrigerant flowing through a liquid-refrigerant connection pipe is in a gas-liquid two-phase state is provided in an outdoor liquid-refrigerant pipe that connects a liquid-side end of an outdoor heat exchanger to the liquid-refrigerant connection pipe, properly transports the refrigerant in a two-phase state while suppressing an increase in a discharge temperature of a compressor. A liquid injection pipe that branches part of a refrigerant flowing through an outdoor liquid-refrigerant pipe and feeds the branched refrigerant to a compressor is connected to a portion of the outdoor liquid-refrigerant pipe on a side of an outdoor heat exchanger with respect to a liquid-pressure adjustment expansion valve.