R32 Refrigerant Injection Switching for Compressor Temperature Control
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Solution Overview
Problem
Air conditioning systems using R32 refrigerant face challenges in managing compressor discharge temperature, as intermediate injection to improve operating capacity can lead to efficiency deterioration, and stopping injection may result in increased discharge temperature, making continuous operation difficult.
Innovation Solution
An air conditioning apparatus with a compressor, condenser, expansion mechanism, intermediate and suction injection channels, switching mechanisms, adjustable valves, an injection heat exchanger, and a control system that dynamically controls refrigerant injection based on compressor rotational speed to manage discharge temperature and maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intermediate injection is performed to improve operating capacity, then operating capacity increases, but operating efficiency deteriorates
Solution Approach 1:
The system dynamically switches between intermediate injection mode and suction injection mode based on operating conditions. The control part monitors the operating state and adjusts the injection mode accordingly, making the system adaptable rather than fixed, thereby resolving the contradiction between capacity improvement and efficiency maintenance under different conditions
Solution Approach 2:
The invention changes the injection parameter (injection location) from fixed intermediate injection to variable injection (intermediate or suction based on conditions). By changing this parameter dynamically, the system can optimize both capacity and efficiency depending on the operating state
2Loss of energy
If intermediate injection is stopped to maintain operating efficiency, then operating efficiency improves, but discharge temperature rises
Solution Approach 1:
The suction injection mode acts as an intermediary solution between complete intermediate injection and no injection. It provides a middle ground that can control discharge temperature while maintaining better efficiency than intermediate injection, serving as a mediator to resolve the contradiction
Solution Approach 2:
The system dynamically adjusts the injection strategy based on real-time operating conditions. When efficiency is prioritized, suction injection can be used instead of intermediate injection to maintain lower discharge temperatures without the severe efficiency penalty, making the response dynamic rather than static
3Productivity
If R32 is used as refrigerant to improve cooling performance, then cooling performance improves, but discharge temperature becomes higher
Solution Approach 1:
The invention segments the refrigerant injection into two separate channels: intermediate injection channel and suction injection channel. This segmentation allows selective application of different injection strategies to manage the discharge temperature issue specific to R32 while maintaining its cooling performance advantages
Solution Approach 2:
The system changes the injection parameter (injection location and timing) to suit R32's characteristics. By using suction injection instead of intermediate injection under certain conditions, the discharge temperature of R32 can be controlled while preserving its superior cooling performance
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
The system effectively suppresses compressor discharge temperature while maintaining operating efficiency by switching between intermediate and suction injection modes based on compressor speed, preventing capacity increases that could lead to operational issues.
Implementation Method 1
The injection heat exchanger exchanges heat between the refrigerant flowing in the main refrigerant channel and the refrigerant flowing downstream of the first injection opening adjustable valve
Implementation Method 2
The compressor sucks in low-pressure refrigerant from a suction passage, compresses the refrigerant and discharges high-pressure refrigerant
Implementation Method 3
The condenser condenses the high-pressure refrigerant discharged from the compressor
Implementation Method 4
The evaporator evaporates the refrigerant expanded by the expansion mechanism
Data Source
AI summary
An air conditioning apparatus uses R32 as a refrigerant, and includes a compressor, a condenser, an expansion mechanism, an evaporator, an intermediate injection channel, a suction injection channel, a switching mechanism, a branch flow channel, first and second injection opening adjustable valves, an injection heat exchanger, a refrigerant storage tank, a bypass channel, and a control part. The switching mechanism switches between an intermediate injection condition in which refrigerant flows in the intermediate injection channel, and a suction injection condition in which refrigerant flows in the suction injection channel. The branch flow channel branches from a main refrigerant channel which joins the condenser and the evaporator, and guides the refrigerant to the intermediate injection channel and the suction injection channel. The bypass channel guides a gas component of the refrigerant accumulated inside the refrigerant storage tank to the intermediate injection channel and the suction injection channel.