Heat Pipe Thermal Management for Electrical Distribution Cabinets
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Solution Overview
Problem
Electrical distribution cabinets face challenges in heat removal due to increased temperature rise from current-carrying busbars, limited space for heat dissipation, and localized 'hotspots' caused by mechanical coupling hardware, which can lead to temperature parameter violations and reduced reliability.
Innovation Solution
A heat transfer system that includes electrically-insulating and thermally-conducting devices coupled to current-carrying conductors, with heat pipes thermally connected to the cabinet, facilitating efficient heat transfer from busbars to the enclosure through phase change mechanisms, thereby enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional convective heat transfer using circulating air is used, then the system is simple to implement, but heat removal capacity is insufficient and temperature rise exceeds predetermined limits
Solution Approach 1:
The patent employs heat pipes that utilize phase change (evaporation and condensation) of working fluid to transfer heat from busbars to the enclosure. The heat pipe contains a working fluid that evaporates at the evaporator section (absorbing heat from busbar) and condenses at the condenser section (releasing heat to enclosure), providing high-efficiency heat transfer that overcomes the limitations of conventional convective cooling
Solution Approach 2:
The heat pipe acts as an intermediary device between the busbar and the enclosure, enabling efficient heat transfer without direct thermal contact. The heat pipe mediates the heat transfer process by capturing heat at the evaporator and delivering it to the condenser, thereby improving heat removal capacity while maintaining electrical isolation
2Temperature
If busbar size and separation distance are increased to reduce temperature rise, then temperature parameters are maintained, but available space in the cabinet becomes constraining
Solution Approach 1:
The heat pipe's phase change mechanism enables high heat flux transfer from compact busbars, allowing the system to maintain temperature parameters without increasing busbar size or separation distance. The latent heat absorption during evaporation and release during condensation provides efficient heat removal in a compact configuration
Solution Approach 2:
The invention changes the heat transfer parameter from low-efficiency convection to high-efficiency phase change heat transfer, enabling the same heat removal capacity in a much smaller volume. This parameter change allows maintaining temperature compliance without increasing physical dimensions of busbars or their spacing
3Reliability
If mechanical coupling hardware is used to facilitate electrical contact between busbars, then electrical connectivity is improved, but localized electrical resistance and hotspots increase
Solution Approach 1:
The heat pipe attached to the mechanical coupling hardware uses phase change heat transfer to rapidly remove heat from localized hotspots. The evaporator section of the heat pipe absorbs heat at the coupling point where electrical contact occurs, preventing temperature buildup while maintaining reliable electrical connectivity
Solution Approach 2:
The heat pipe serves as a thermal intermediary at the mechanical coupling point, mediating the heat removal process without interfering with electrical contact function. It captures heat at the hotspot location and transports it away, allowing the mechanical coupling to maintain both electrical reliability and thermal management
4Productivity
If electrically-conducting heat transfer devices are used for phase change heat transfer, then heat transfer efficiency is improved, but electrical conduction risk to the enclosure increases
Solution Approach 1:
The heat pipe is constructed from electrically non-conducting materials (such as ceramic or polymer composites) that still provide high thermal conductivity. This composite construction allows the heat pipe to maintain efficient phase change heat transfer while providing electrical isolation between the energized busbar and the enclosure, eliminating the electrical conduction risk
Solution Approach 2:
The electrically non-conducting heat pipe acts as a dual-function intermediary: it mediates heat transfer through phase change while simultaneously providing electrical insulation. This intermediary device bridges the thermal gap without creating an electrical conduction path, resolving the conflict between heat transfer efficiency and electrical safety
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 solution effectively increases heat transfer capacity, maintains internal temperatures within predetermined limits, reduces material usage, and allows for higher power density without derating electrical components, while minimizing the physical footprint of busbars and circuit breakers.
Implementation Method 1
phase change heat transfer through heat pipes
Implementation Method 2
at least one heat pipe coupled to the at least one electrically-insulating and thermally-conducting device
Implementation Method 3
electrically-insulating and thermally-conducting device coupled to the at least one current-carrying conductor
Implementation Method 4
circulating air within the cabinets, thereby relying primarily on convective heat transfer within the cabinets to remove the heat generated by the busbars
Data Source
AI summary
A heat transfer system includes an electrical distribution cabinet extending about at least one current-carrying conductor. The heat transfer system also includes at least one electrically-insulating and thermally-conducting device coupled to the at least one current-carrying conductor. The heat transfer system further includes at least one heat pipe coupled to the at least one electrically-insulating and thermally-conducting device. The heat pipe is also thermally coupled to at least a portion of the electrical distribution cabinet.