Heat Exchanger Header Layout for Uniform Refrigerant Defrosting
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Solution Overview
Problem
Conventional air conditioners face challenges in efficiently alternating the passage of refrigerant during cooling and heating operations, leading to uneven refrigerant flow and potential frost concentration in heat exchangers, which affects performance and defrosting efficiency.
Innovation Solution
The air conditioner design incorporates a heat exchanger with a first and second header pipe system, featuring alternately coupled branch pipes that allow for efficient refrigerant flow alternation between cooling and heating operations, preventing frost concentration through uniform refrigerant distribution across multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single-path refrigerant flow is used in heat exchanger, then device complexity is reduced, but refrigerant flow uniformity deteriorates causing frost concentration
Solution Approach 1:
The heat exchanger is divided into multiple independent refrigerant flow paths using separate header pipes (first header pipe and second header pipe) and their corresponding branch pipes. This segmentation allows refrigerant to flow through multiple parallel paths, ensuring uniform distribution across the heat exchange units and preventing frost concentration in single paths.
2Manufacturing precision
If multiple header pipes with alternating branch pipes are used, then refrigerant flow uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple refrigerant flow paths are merged into a single integrated heat exchanger structure. The first and second header pipes with their respective branch pipes are combined within the same heat exchanger body, sharing common heat exchange units and mounting structures, thereby achieving uniform refrigerant distribution without proportionally increasing overall device complexity.
Solution Approach 2:
The multiple header pipes and branch pipes serve universal functions within the heat exchanger - each path performs the same heat exchange operation, allowing the system to maintain flexibility in refrigerant flow distribution while using standardized components and structures across all paths.
3Ease of operation
If refrigerant passage is not alternated between cooling and heating operations, then operation simplicity is maintained, but heat exchange efficiency deteriorates due to frost concentration
Solution Approach 1:
The refrigerant flow paths are designed to be dynamically switchable between cooling and heating operations. The first and second header pipes can alternate their function - serving as supply and return paths depending on the operational mode, allowing the system to adapt to different thermal requirements while maintaining efficient heat exchange and preventing frost accumulation.
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 design ensures uniform refrigerant flow and efficient heat exchange, preventing frost concentration during heating and facilitating uniform defrosting, enhancing the overall performance and reliability of air conditioning systems.
Implementation Method 1
a heat exchange unit coupled to the first header pipe and to thermally exchange the refrigerant with air
Data Source
AI summary
An air conditioner includes a compressor and a heat exchanger. The heat exchanger includes a first header pipe to have a refrigerant compressed by the compressor to flow therein, a heat exchange unit including a plurality of first refrigeration tubes and a plurality of second refrigeration tubes to thermally exchange the refrigerant with air, a plurality of first header branch pipes coupling the first header pipe with corresponding first refrigeration tubes in the heat exchange unit, a bypass pipe to have the refrigerant, thermally exchanged in the heat exchange unit, passing therethrough in the air cooling operation, and a second header pipe to have the refrigerant passing through the bypass pipe to flow therein. A plurality of second header branch pipes couples the second header pipe with corresponding second refrigeration tubes in the heat exchange unit, where at least two first refrigeration tubes have at least one second refrigeration tube therebetween.