Ridged Cable Jacket for Heat Dissipation in Power LAN Bundles
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Solution Overview
Problem
The increased power throughput in tandem power/data LAN cables, as per newer standards like IEEE 802.3bt, leads to elevated operating temperatures, posing fire safety and data transmission performance risks due to inefficient heat dissipation in standard cable jackets, limiting the number of cables that can be installed together.
Innovation Solution
A novel cable jacket design featuring circumferentially disposed ridges or valleys on its outer surface, creating air gaps between adjacent cables to enhance convective heat transfer and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If standard cable jackets with smooth outer surfaces are used, then the cable structure is simple and easy to manufacture, but heat dissipation efficiency is poor leading to elevated operating temperatures
Solution Approach 1:
The cable jacket is segmented into multiple longitudinal ridges that divide the outer surface into distinct sections. This segmentation creates channels for air flow between adjacent cables, improving convective heat transfer while maintaining a relatively simple extrusion process for manufacturing the ridged structure.
Solution Approach 2:
The jacket design adds a longitudinal dimensional feature (ridges running along the cable length) to the otherwise cylindrical surface. This dimensional change creates air gaps between adjacent cables when installed in bundles, enabling improved heat dissipation through enhanced air circulation in the space between cables.
2Productivity
If multiple cables are installed together in bundles, then space utilization is improved, but heat dissipation efficiency deteriorates due to reduced air flow between cables
Solution Approach 1:
The ridged jacket structure segments the cable surface into longitudinal sections separated by ridges. When multiple cables are installed in bundles, these ridges create consistent air gaps between adjacent cables, maintaining air flow channels that enable effective convective heat transfer even in high-density installations.
Solution Approach 2:
The ridges on the jacket act as an intermediary structure that mediates between the cable surface and adjacent cables. They create and maintain air gaps without requiring additional spacing hardware, allowing the air itself to serve as the heat transfer medium while the ridges ensure adequate spacing is maintained in cable bundles.
3Power
If higher power throughput is delivered through the cable, then power delivery capability is improved, but heat generation increases leading to safety concerns and limited cable bundling
Solution Approach 1:
The ridged jacket design converts the harmful effect of heat generation into a beneficial cooling mechanism. The ridges create air channels that harness natural convection currents to actively remove heat from the cable, transforming the heat problem into an opportunity for enhanced passive cooling that scales with power throughput.
Solution Approach 2:
The jacket design changes the thermal parameters of the cable system by modifying the surface geometry. The ridges increase the effective surface area for heat transfer and create airflow channels that improve the convective heat transfer coefficient, thereby changing the overall heat dissipation capacity to match higher power throughput requirements.
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 allows for the installation of more LAN cables within a single pathway without exceeding safe operating temperatures, ensuring effective heat dissipation and maintaining data transmission performance.
Implementation Method 1
allowing the heat released from the one or more powered twisted pairs to escape more easily through the outer surface of the jacket and to generate a convection air flow upward around and in between the cables
Data Source
AI summary
A cable is provided, configured for tandem communication and power transmission. The cable has a plurality of twisted pair conductors and a jacket surrounding said twisted pair conductors. The jacket includes a plurality of either ridges, valleys or both, disposed substantially perpendicular to the longitudinal axis of the cable, the ridges and/or valleys are dimensioned and spaced apart in a manner sufficient to create an air passage when the cable is arranged adjacent to and abutting other cables.