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Heat Shield Insulation for Thermal Challenges in Automotive Exhaust System

Sharda Motor Industries, Ltd.-Sivanandi Rajadurai, Ananth S
  • Technical Paper
  • 2019-28-2539
To be published on 2019-11-21 by SAE International in United States
While advanced automotive system assemblies contribute greater value to automobile safety, reliability, emission/noise performance and comfort, they are also generating higher temperatures that can reduce the functionality and reliability of the system over time. Thermal management and proper insulation are extremely important and highly demanding for the functioning of BSVI and RDE vehicles. Frugal engineering is mandatory to develop heat shield in the exhaust system with minimum heat loss. Heat shield design parameters such as insulation material type, insulation material composition, insulation thickness, insulation density, air gap thickness and outer layer material are studied for their influences on skin temperature using mathematical calculation, CFD simulation and measurement. Simulation results are comparable to that of the test results within 10% deviation. The performance index is calculated using the temperature gradient between the pipe surface and the external skin temperature. The performance index increases with material insulation thickness and insulation material density. Increase in insulation thickness from 6 mm to 19 mm reduces the skin temperature from 44% to 77%. The specialty insulation material provides a high…
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CABLE, ELECTRICAL, 600 VOLTS, PORTABLE, MULTICONDUCTOR, OZONE RESISTANT

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS5756/4B
  • Current
Published 2019-10-22 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available
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WIRE, ELECTRICAL, POLYTETRAFLUOROETHYLENE/POLYIMIDE INSULATED, LIGHT WEIGHT, NICKEL COATED, COPPER CONDUCTOR, 260 °C, 600 VOLTS, ROHS

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS22759/92C
  • Current
Published 2019-10-22 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available
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Atomically Thin Heat Shield Protects Electronic Devices

  • Magazine Article
  • TBMG-35266
Published 2019-10-01 by Tech Briefs Media Group in United States

Excess heat given off by smartphones, laptops, and other electronic devices contributes to malfunctions and, in extreme cases, can even cause lithium batteries to explode. To guard against issues, engineers often insert glass, plastic, or layers of air as insulation to prevent heat-generating components like microprocessors from causing damage.

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Performance Requirements for Wire, Electric, Insulated Copper or Copper Alloy

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS4372C
  • Current
Published 2019-09-24 by SAE International in United States
This document covers the requirements for insulated, single-conductor, electric wires with tin-coated, silver-coated, or nickel-coated conductors of copper or copper alloy as specified in an applicable generated performance sheet (see Appendix A for sample). It provides general performance requirements, ratings, and information for various characteristics of insulated wire systems used in aerospace applications. Numerical test requirements, or parameters, were originally developed using either English or metric units. The original, primary, units are shown first with the secondary (converted) units in parentheses. Secondary units are listed for information only and are not to be considered requirements. Wire will be assigned a level of performance for many requirements set forth in this standard. These performance levels, in addition to numerical test results, shall be listed in the applicable performance sheet. This standard contains some tests and referenced AS4373 Test Methods that have not been rigorously confirmed as reproducible. Such methods are identified under the Precision and Bias Statements in the individual AS4373 Test Methods. Many requirements have multiple levels of performance. The wire with base level of…
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WIRE, ELECTRIC, CROSSLINKED POLYALKENE INSULATED, SILVER-COATED HIGH STRENGTH COPPER ALLOY, LIGHT WEIGHT, 600-VOLT, 150 °C

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS81044/13B
  • Current
Published 2019-08-29 by SAE International in United States

Scope is unavailable.

High-Temperature Dielectric Nanocomposite

  • Magazine Article
  • TBMG-34899
Published 2019-08-01 by Tech Briefs Media Group in United States

A nanocomposite was developed that could be a superior high-temperature dielectric material for flexible electronics, energy storage, and electric devices. The nanocomposite combines one-dimensional polymer nanofibers and two-dimensional boron nitride nano-sheets. The nanofibers reinforce the self-assembling material while the white graphene nanosheets provide a thermally conductive network that allows it to withstand the heat that breaks down common dielectrics, the polarized insulators in batteries, and other devices that separate positive and negative electrodes.

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Thermal Conductivities of Some Polymers and Composites

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_09
Published 2019-08-01 by SAE International in United States

Assessing the performance of polymers used in structural armor and filament winding applications.

Thermoset polymers are good electrical insulators that are used in applications ranging from electronics to composite armor. They are rather poor thermal conductors, however.

Annotation ability available

Products of Tomorrow: August 2019

  • Magazine Article
  • TBMG-34886
Published 2019-08-01 by Tech Briefs Media Group in United States

This column presents technologies that have applications in commercial areas, possibly creating the products of tomorrow. To learn more about each technology, see the contact information provided for that innovation.

Controlling Thermal Conductivity of Polymers with Light

  • Magazine Article
  • TBMG-34923
Published 2019-08-01 by Tech Briefs Media Group in United States

Polymers are regularly used as thermal insulators and can even be used as thermal conductors to enable efficient heating or cooling. A new type of polymer was created that demonstrates a switchable thermal conductivity controlled by light.