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Improvements to Wire Bundle Thermal Modeling for Ampacity Determination.

Steven L Rickman1, Christopher J Iannello2, Khadijah Shariff3

  • 1NASA Engineering and Safety Center, 2101 NASA Parkway, Houston, Texas, USA.

Journal of Fluid Flow, Heat and Mass Transfer
|October 22, 2019
PubMed
Summary
This summary is machine-generated.

A new thermal model accurately determines wire bundle ampacity in aerospace vehicles, overcoming limitations of previous methods for complex configurations and improving safety and design efficiency.

Keywords:
Ampacityheat transferthermal analysiswire bundle

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Area of Science:

  • Aerospace Engineering
  • Thermal Management
  • Electrical Systems

Background:

  • Current carrying capacity (ampacity) is crucial for aerospace vehicle safety and design.
  • Existing standards lack flexibility for mixed-gauge wire bundles with varied insulation properties.
  • Previous thermal models had limitations in configuration size and numerical stability.

Purpose of the Study:

  • To develop an advanced thermal model for accurate ampacity determination in complex aerospace wire bundles.
  • To overcome limitations of previous models regarding configuration size and low emittance surfaces.
  • To provide a more flexible tool for analyzing mixed-gauge and mixed-current wire bundle designs.

Main Methods:

  • Development of a new thermal modeler capable of handling larger configurations.
  • Incorporation of internal radiation and interface conductance parameters.
  • Analysis of temperature and ambient air pressure effects on thermal conductance.
  • Comparison of model-predicted ampacity with standards-based calculations.

Main Results:

  • The new model accommodates larger wire bundle configurations.
  • Numerical stability is achieved even with low emittance external jackets.
  • Key thermal parameters, including conductance, are formulated considering environmental factors.
  • Model predictions show good agreement with existing standards.

Conclusions:

  • The enhanced thermal model provides a flexible and stable solution for aerospace wire bundle ampacity determination.
  • This tool supports efficient design and enhances safety for complex electrical systems.
  • Further research can refine the model for even broader applications.