Rectangular Fin-Tube Heat Exchanger With Turbulence Control
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Solution Overview
Problem
Fin-tube type heat exchangers face issues with heat efficiency deterioration and tube damage due to boiling noises and foreign substance adhesion, particularly in rectangular tubes with large heat transfer areas, where existing solutions for circular tubes are not applicable.
Innovation Solution
The design incorporates first and second turbulent flow-generating members within the tubes and heat medium inflow/discharge tubes, along with louvers on the heat transfer fins, to promote turbulent flow and reduce flow resistance, preventing overheating and adhesion, while maintaining efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rectangular tube with large heat transfer area is used, then heat exchange efficiency is improved, but local overheating occurs causing boiling noises and foreign substance adhesion
Solution Approach 1:
The tube cross-section is divided into multiple flow channels by partition walls, creating multiple smaller flow paths within the rectangular tube. This segmentation prevents local overheating by distributing the heat medium flow across multiple zones, reducing the risk of bubble formation and foreign substance adhesion in any single area.
Solution Approach 2:
Different sections of the tube have different structural characteristics - the partition walls create zones with varying flow velocities and heat transfer characteristics. This local differentiation ensures that areas prone to overheating receive enhanced cooling effects through controlled turbulent flow patterns.
2Productivity
If heat transfer fins are added to increase heat transfer area, then heat efficiency is improved, but flow resistance increases and turbulent flow is reduced
Solution Approach 1:
The heat transfer fins are designed with curved or inclined surfaces rather than flat planar structures. This curvature optimizes the flow path of the combustion product, reducing flow resistance while maintaining effective heat transfer area. The curved surfaces guide the fluid flow more smoothly across the fin structures.
Solution Approach 2:
The partition walls extend in the longitudinal direction of the tube, creating three-dimensional flow channels that interact with the heat transfer fins. This additional dimensional structure allows the heat medium to access heat transfer surfaces from multiple directions, improving heat efficiency without proportionally increasing flow resistance.
3Volume of moving object
If the number of tubes is reduced for compact design, then device size is reduced, but heat exchange efficiency may deteriorate
Solution Approach 1:
Multiple flow channels are merged within a single rectangular tube structure, combining the heat exchange functions of what would traditionally require multiple separate tubes. This integration maintains high heat exchange efficiency while reducing the overall number of tubes needed, achieving a more compact design.
Solution Approach 2:
The partition walls utilize the longitudinal dimension of the tube to create extended heat transfer surfaces and multi-path flow channels. This three-dimensional utilization of space allows a single tube to perform the heat exchange function of multiple tubes, reducing device size while maintaining efficiency.
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
The solution effectively prevents boiling noises and heat efficiency deterioration, enhances heat exchange efficiency, and allows for a compact, high-efficiency heat exchanger with reduced processing time and costs, even with fewer tubes.
Implementation Method 1
a first turbulent flow-generating member 130 for generating a turbulent flow in the heat medium is disposed inside each of the tubes 110
Implementation Method 2
heat transfer fins 150 spaced apart from each other and coupled to an outer surfaces of the tubes 110
Implementation Method 3
allow a combustion product to pass through a space therebetween
Data Source
AI summary
The present invention relates to a pin-tube type heat exchanger, comprising: tubes through the inside of which a heat medium flows and which are arranged in parallel with a uniform distance therebetween, so that a combustion product can pass through space between the tubes; and heat transfer fins which are separately coupled to the outer surface of the tubes along the longitudinal direction thereof, so as to be parallel to the direction of flow of the combustion product, wherein inside the tubes a first turbulent flow-generating member is installed for creating turbulence in the flow of the heat medium, wherein the first turbulent flow-generating member comprises a flat plate part, arranged in the longitudinal direction of the tubes, for dividing the inner space of the tubes into two sides, and first guide pieces and second guide pieces which are protrudingly provided at a tilted angle and are separately and alternately provided along the longitudinal direction of both sides of the flat plate part.