Condenser Tube Fin Flanks for Faster Condensate Drainage
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Solution Overview
Problem
Current heat exchanger tubes face limitations in vapor condensation efficiency due to inundation effects and capillary forces that hinder condensate drainage, especially with high fin densities, leading to reduced performance and increased pressure drop.
Innovation Solution
The introduction of additional structural elements in the form of material projections on the fin flanks, formed using a toothed wheel-like tool, which extend in axial and radial directions, creating convex edges and pocket-like structures that reduce capillary forces and enhance surface area for condensation, while maintaining low production costs and pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fin density is increased to enhance heat transfer surface area, then condensation efficiency is improved, but capillary forces increase and hinder condensate drainage
Solution Approach 1:
The patent applies different structural characteristics to different regions of the fin surface. The fin flanks are equipped with additional structural elements (protrusions, grooves, or cavities) that specifically address condensate drainage, while the fin tips maintain standard geometry for heat transfer. This local differentiation allows the fin density to be increased for better heat transfer without proportionally increasing capillary forces throughout the entire fin structure.
Solution Approach 2:
The fin surface is segmented into functional zones: the fin flanks with additional structural elements that promote condensate drainage, and the fin tips that provide heat transfer surface area. This segmentation allows independent optimization of each zone - the flanks can be designed to minimize capillary forces and facilitate drainage, while the tips can be densely packed to maximize condensation efficiency.
2Productivity
If additional structural elements are added to fin flanks to increase surface area, then heat transfer is enhanced, but device complexity increases
Solution Approach 1:
The additional structural elements on the fin flanks create a porous or textured surface geometry that increases effective heat transfer area. These elements can be formed as integrated features during the tube manufacturing process (such as during extrusion or drawing), rather than requiring separate manufacturing steps. This approach enhances heat transfer while minimizing the increase in device complexity, as the porous structure is built-in rather than added.
3Area of stationary object
If material projections extend in axial and circumferential directions, then surface area increases, but pocket-like structures form that retain condensate
Solution Approach 1:
Instead of allowing material projections to extend equally in all directions (which creates condensate-retaining pockets), the patent inverts the approach by designing the additional structural elements to extend primarily in the axial direction along the fin flanks, with minimal circumferential extension. This inverted geometry - elongated axially rather than radially or circumferentially - increases surface area for heat transfer while preventing the formation of closed pockets that would trap condensate. The structural elements act as drainage channels rather than retention cavities.
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 enhances heat transfer during condensation by minimizing pocket-like structures that retain condensate, allowing for quicker drainage and increased surface area for vapor condensation, thereby improving the efficiency and performance of the heat exchanger tube.
Implementation Method 1
The fin flanks are provided with additional structural elements which are arranged laterally on the fin flank. First material projections, which extend mainly in the axial and radial directions, adjoin second material projections which mainly extend in the axial and circumferential directions of the tube
Implementation Method 2
The material projections which are described in these printed documents extend in the axial and circumference directions of the tube. The condensate accumulates preferably in these pocket-like structures on account of capillary forces
Implementation Method 3
Heat transfer occurs in many technical processes, for example in refrigeration and air conditioning technology or in chemical and energy technology. In heat exchangers, heat is transferred from one medium to another medium
Data Source
AI summary
A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.