Refrigeration Cycle Flow Path Switching for Counter-Flow Heat Exchange
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Solution Overview
Problem
Conventional air conditioning systems face reduced heat exchange efficiency due to parallel flows of refrigerant and air in cooling circuits, and insufficient controllability of gas refrigerant flow rates, particularly in systems with pressure-dependent gas-liquid separators.
Innovation Solution
A refrigeration cycle apparatus with a four-way valve and flow path switching apparatus that reverses refrigerant flow paths in heat exchangers, allowing counter-flow configurations and independent control of refrigerant pressures, enhancing heat exchange efficiency and controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If flow path switching means is added to reverse refrigerant flow direction in heat exchangers, then heat exchange efficiency is improved through counter-flow configuration, but device complexity increases
Solution Approach 1:
The flow path switching apparatus serves multiple functions: it reverses refrigerant flow direction to achieve counter-flow configuration for improved heat exchange efficiency, and simultaneously maintains proper refrigerant flow paths for both cooling and heating operations. This multi-functionality resolves the contradiction by making the added complexity serve multiple purposes rather than a single function.
Solution Approach 2:
The invention applies flow path switching means that can reverse the direction of refrigerant flow through the heat exchangers. By switching the flow direction to create counter-flow configuration (refrigerant flowing opposite to air), the heat exchange efficiency is significantly improved. This inversion principle directly addresses the heat exchange efficiency loss while the switching mechanism is designed to integrate with existing systems.
2Device complexity
If pressure-dependent gas-liquid separator is used, then system simplicity is maintained, but controllability for gas refrigerant flow rate becomes insufficient
Solution Approach 1:
The invention introduces an independent pressure control mechanism for the gas-liquid separator that allows dynamic adjustment of separator pressure regardless of the main refrigerant circuit pressure. This dynamic control capability enables proper functioning of the expansion valve and controllable gas refrigerant flow rate, while the separator itself remains a relatively simple pressure-dependent device. The contradiction is resolved by separating the pressure control function from the separator structure.
3Ease of operation
If flow path switching apparatus is introduced to control refrigerant flow paths independently of operation mode, then controllability for gas refrigerant flow rate is improved, but device complexity increases
Solution Approach 1:
The flow path switching apparatus is designed to perform multiple control functions: it controls refrigerant flow paths in the heat exchangers to achieve counter-flow configuration, and simultaneously manages the connection between the gas-liquid separator and the refrigerant circuit. By consolidating these control functions into a single apparatus, the invention improves controllability while minimizing the increase in device complexity compared to having separate control mechanisms for each function.
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
Improves heat exchange efficiency and maintains controllability of gas refrigerant flow rates without deterioration, optimizing performance across different operation modes.
Implementation Method 1
improvement in heat exchange efficiency of a heat exchanger
Data Source
AI summary
A refrigeration cycle apparatus includes a flow path switching apparatus. In a first operation mode, the flow path switching apparatus is configured to cause a second port and a second refrigerant port of a second heat exchanger to communicate with a suction port of a compressor via a four-way valve. In a second operation mode, the flow path switching apparatus is configured to cause the second port to communicate with the second refrigerant port of the second heat exchanger without the second port and the second refrigerant port of the second heat exchanger communicating with the suction port of the compressor, and cause a discharge port of the compressor to communicate with a first refrigerant port of the second heat exchanger via the four-way valve.