Twisted Heat Exchanger Tube Geometry for Dust and Moisture Discharge
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Solution Overview
Problem
Micro-channel heat exchangers suffer from dust and moisture accumulation in twisted and bent sections, leading to corrosion and potential leakage.
Innovation Solution
The heat exchanger design includes a flat heat exchange tube with specific geometric configurations, such as parallel side surfaces and controlled angles and distances between sections, along with protruding bent sections to facilitate dust and moisture discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat exchange tube is twisted and bent to improve heat exchange efficiency, then heat exchange performance is improved, but dust and moisture accumulate in the torsion section leading to corrosion
Solution Approach 1:
The heat exchange tube is segmented into a straight section and a bent section. The bent section is separated from the straight section by a connection structure, creating distinct functional zones. This segmentation allows the straight section to maintain good dust discharge performance while the bent section provides heat exchange efficiency, resolving the contradiction between the two requirements.
Solution Approach 2:
Different sections of the heat exchange tube are given different geometric characteristics tailored to their specific functions. The straight section has a simple linear structure optimized for dust discharge, while the bent section has curved geometry optimized for heat exchange. This local differentiation allows each section to excel at its designated task without compromising the other.
2Productivity
If the heat exchange tube is twisted and bent to improve heat exchange efficiency, then heat exchange performance is improved, but the structure becomes complex increasing manufacturing difficulty
Solution Approach 1:
The complex bent structure is segmented into a connection structure with specific geometric parameters rather than a continuous complex curve. This segmentation simplifies manufacturing by breaking down the complex geometry into manageable sections that can be produced using standard forming processes, reducing overall manufacturing complexity while maintaining heat exchange efficiency.
Solution Approach 2:
The connection structure between straight and bent sections uses specific geometric parameters (such as controlled angles and radii) to transition smoothly between different tube orientations. By optimizing these parameters, the design achieves complex functionality through controlled geometric variations rather than arbitrary complex shapes, making the manufacturing process more predictable and easier to control.
3Ease of manufacture
If the heat exchange tube uses a simple straight structure to ease manufacturing, then manufacturing is simplified, but dust and moisture cannot be effectively discharged
Solution Approach 1:
The connection structure incorporates curved transitions instead of sharp angles or completely straight lines. These controlled curves facilitate smooth fluid flow and dust particle movement through the heat exchange tube, preventing accumulation at transitions while maintaining a relatively simple overall structure that remains easy to manufacture.
4Ease of operation
If the heat exchange tube is bent into U-shaped or V-shaped to facilitate dust discharge, then dust discharge efficiency is improved, but the included angle reduction may increase stress concentration
Solution Approach 1:
The connection structure uses curved transitions with appropriate radii to connect the straight and bent sections. These curved transitions distribute mechanical stresses more evenly compared to sharp angles, reducing stress concentration points while maintaining the U-shaped or V-shaped configuration needed for effective dust discharge. The curvature acts as a stress-relieving feature that preserves both structural integrity and dust discharge functionality.
Data Source
AI summary
A processing method for a heat exchanger is provided. The method includes: preparing a heat exchanger, twisting the processing section of the at least one heat exchange tube relative to the first section and the second section of the heat exchange tube along the length direction of the first tube; bending the processing section along a length direction of the processing section to make the processing section U-shaped or V-shaped, and reducing an included angle between the first section and the second section of the at least one heat exchange tube to a predetermined angle; and pushing the processing section by a predetermined distance along the same direction as a direction in which the processing section of the at least one heat exchange tube is twisted, to obtain a bent section from the processing section.