Heat Exchanger Header Layout for Frost-Resistant Drainage
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Solution Overview
Problem
The existing heat exchanger design faces issues with frost accumulation on flat pipes and corrugated fins, where water droplets flowing down to the distribution headers are hindered by the circular arc shape of the headers' top surface, leading to poor drainage and frosting problems.
Innovation Solution
The heat exchanger features distribution headers with inclined upper surfaces from the windward to the leeward side, arranged in multiple rows with increasing distance between opposing surfaces, facilitating water drainage through gravity and wind force, and incorporating corrugated fins that are also inclined to enhance drainage capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the distribution header has a circular arc cross-sectional shape with the middle portion as the highest point, then the structural integrity and aesthetic appearance are improved, but the water drainage capability deteriorates because water droplets cannot flow smoothly off the curved surface
Solution Approach 1:
The distribution header is divided into multiple drainage portions, each with its own inclined upper surface. This segmentation allows water to be channeled to multiple drainage points rather than relying on a single curved surface, effectively resolving the drainage problem while maintaining the overall header structure
Solution Approach 2:
Instead of using a circular arc shape with the highest point in the middle (convex upward), the invention inverts the approach by creating inclined surfaces that slope downward from the windward side to the leeward side. This inversion transforms the water flow path from a problematic curved surface to an efficient inclined plane that promotes drainage
2Device complexity
If the distribution headers are arranged in a single row, then the device complexity is reduced, but the drainage efficiency deteriorates because water droplets accumulate on the header surface
Solution Approach 1:
The distribution headers are arranged in multiple rows with spaces between them, creating multiple drainage pathways. This segmentation of the header arrangement allows water droplets to drain more efficiently across multiple surfaces rather than accumulating on a single row of headers
Solution Approach 2:
The invention transitions from a single-row arrangement to a multi-row arrangement, adding spatial dimensionality to the header configuration. This dimensional change creates additional drainage surfaces and pathways, improving drainage efficiency without significantly increasing overall device complexity
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 improves the drainage efficiency and anti-frosting performance by allowing water to flow smoothly down the inclined surfaces, leveraging both gravity and wind force, thus preventing frosting and ensuring effective water removal from the headers.
Implementation Method 1
the top surface of each distribution header is inclined downward from the windward side to the leeward side, gravity and the force of the wind can facilitate downward flow of drops of water on the top surface
Implementation Method 2
gravity and the force of the wind can facilitate downward flow of drops of water on the top surface
Data Source
Figure 1
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AI summary
A heat exchanger according to the present invention has: a plurality of heat transfer pipes that are disposed in parallel with spaces therebetween; distribution headers that are respectively connected to lower ends of the plurality of heat transfer pipes so as to communicate with the heat transfer pipes and distribute a refrigerant; and fins that are provided in an air duct between the heat transfer pipes adjacent to each other. The distribution headers have top surfaces inclined downward from a windward side to a leeward side.