Nested Tube Heat Exchanger Design for Compact Footprint
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Solution Overview
Problem
Conventional heat exchangers employing interconnected tubes are large in size and costly, limiting their installation sites and increasing manufacturing and operational costs due to the need for extensive tube lengths to achieve sufficient heat transfer.
Innovation Solution
A heat exchanger design featuring a primary helical flow path surrounding a secondary flow path, with flow direction control inserts such as helical screws to vary the effective path length and enhance heat transfer efficiency, and a configuration where the secondary medium is carried within a tube and the first medium within the outer wall, allowing for improved heat exchange without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interconnected tubes are used to achieve sufficient heat transfer, then heat transfer capability is improved, but the size and length of the heat exchanger increases
Solution Approach 1:
The patent implements a nested tube configuration where an inner tube carrying secondary medium is positioned within an outer tube carrying primary medium. This concentric arrangement allows both fluids to exchange heat through the tube walls while occupying the same spatial envelope, effectively doubling the heat transfer surfaces without proportionally increasing the overall size or length of the heat exchanger.
Solution Approach 2:
The invention transitions from a planar or simple linear tube arrangement to a three-dimensional concentric configuration. By utilizing the radial dimension and creating multiple flow paths (inner tube, outer tube annulus), the heat exchanger achieves greater heat transfer surface area within a compact volume, reducing the required length while maintaining heat transfer capability.
2Reliability
If longer tube lengths are used to improve heat transfer, then heat exchange efficiency is improved, but manufacturing and operational costs increase
Solution Approach 1:
By nesting tubes concentrically, the patent achieves extended heat transfer surface area without requiring proportionally longer tubes. The inner and outer tubes can be manufactured to standard lengths and connected at ends, reducing the need for custom-long tube fabrication and minimizing welding or joining operations, thereby lowering manufacturing costs while maintaining heat exchange efficiency.
Solution Approach 2:
The heat exchanger is divided into modular sections with standardized tube lengths and connections. This segmentation allows for easier manufacturing, assembly, and maintenance, reducing overall costs compared to a single long tube configuration that would require specialized fabrication and handling.
3Reliability
If larger heat exchanger size is used to achieve sufficient heat transfer, then heat transfer capability is improved, but installation flexibility is reduced
Solution Approach 1:
The nested tube configuration concentrates heat transfer surfaces within a compact outer diameter, creating a space-efficient design that can be installed in locations with limited space availability. The compact footprint maintains heat transfer capability while enabling installation in tighter spaces where conventional larger heat exchangers would not fit.
Solution Approach 2:
By utilizing the radial dimension through concentric tubes, the design achieves high heat transfer surface area within a small radial footprint. This dimensional approach allows the heat exchanger to maintain effectiveness while reducing its overall size, thereby improving adaptability to various installation locations with space constraints.
4Reliability
If more material is used to extend tube length for heat transfer, then heat transfer capability is improved, but material usage and costs increase
Solution Approach 1:
The nested tube design creates multiple heat transfer surfaces (inner tube surface, outer tube surface, annulus region) within the same material volume. This configuration maximizes the utilization of material by creating heat exchange interfaces in both the inner and outer tubes, effectively doubling the heat transfer capability without proportionally increasing material consumption compared to a single long tube.
Solution Approach 2:
By transitioning to a three-dimensional concentric configuration, the invention achieves greater heat transfer surface area within a limited material budget. The radial arrangement allows material to be utilized more efficiently, creating heat exchange surfaces in multiple radial zones rather than extending linearly, thereby reducing total material usage for the same heat transfer capability.
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 design reduces the overall dimensions and material usage of heat exchangers, increasing heat transfer efficiency, lowering costs, and enabling easier installation and retrofitting of existing units, while maintaining or improving heat transfer capabilities.
Implementation Method 1
a primary flow path arranged to contain a first heat exchanging medium; and a secondary flow path arranged to contain a secondary heat exchanging medium, wherein the primary flow path surrounds the secondary flow path for exchanging heat between the two mediums
Data Source
AI summary
A heat exchanger having a primary flow path arranged to contain a first heat exchanging medium. A secondary flow path arranged to contain a secondary heat exchanging medium, wherein the primary flow path surrounds the secondary flow path for exchanging heat between the two paths.