Ventilation Chimneys for Horizontal Busway Thermal Management
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Solution Overview
Problem
Horizontally mounted busways with H-shaped configurations face thermal management challenges due to heat generation from internal resistance and air stratification, leading to increased operating temperatures, which necessitates the use of more copper and material, increasing weight, bulk, and cost.
Innovation Solution
Incorporation of ventilation chimneys in the side-panels of the busway housing, formed as open-ended half-pipes, to create a path for hot air circulation from underneath the busbars to above, reducing heat build-up and allowing for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If more copper is used to cool conductors, then thermal requirements are met, but weight and cost increase
Solution Approach 1:
The patent introduces air as an intermediary cooling medium through ventilation chimneys. The chimneys create airflow paths that allow ambient air to circulate around the busbars, transferring heat away from the conductors without requiring additional copper material. This mediator (air flow) enables thermal management while avoiding the weight penalty of increased copper usage.
2Temperature
If copper is added to meet thermal requirements, then temperature control is improved, but cost increases
Solution Approach 1:
The ventilation chimneys serve as intermediaries that enable passive air cooling. By structuring the housing to include these chimneys, the system leverages natural convection currents to remove heat, eliminating the need for expensive active cooling systems or excessive copper material. The cost-effective solution uses simple structural modifications rather than expensive materials or complex mechanisms.
3Strength
If H-shaped configuration is used, then structural integrity is maintained, but heat transfer ability decreases due to air stratification
Solution Approach 1:
The patent segments the enclosed space within the H-shaped housing by introducing ventilation chimneys that divide the cavity into distinct airflow zones. This segmentation creates dedicated pathways for hot air to rise and escape, preventing stratification while preserving the overall H-shaped structural configuration. The chimneys act as internal partitions that organize fluid flow without compromising external structural integrity.
Solution Approach 2:
The ventilation chimneys introduce air flow as an intermediary mechanism to overcome the heat transfer limitations of the H-shaped configuration. By creating controlled airflow paths within the housing, the chimneys enable effective heat removal while the H-shaped structure maintains its structural advantages. The air flow mediates between the conflicting requirements of structural form and thermal performance.
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 ventilation chimneys effectively lower operating temperatures, reducing the need for excessive copper and material, thereby decreasing weight, cost, and improving thermal management while preventing air stagnation and water accumulation.
Implementation Method 1
busbars generate heat under normal operating conditions due to inherent internal resistance... create a cavity on the underside where hot air stratifies... ventilation chimneys provide a ventilation path that allows hot air to circulate from an area below the busbars to an area above the busbars
Data Source
AI summary
A busway assembly including a plurality of busbars mounted in a horizontal orientation and stacked in a sandwich configuration for conducting electrical current. The busbars are enclosed within a housing having an H-shaped configuration and including side-panels with ventilation chimneys through which hot air circulates from a low area underneath the busbars to an upper area above the busbars. The ventilation chimneys include open-ended half-pipes that are inserted in respective apertures of the side-panels.