Heat Transfer Properties of Military Protective Headgear

Abstract

The heat transfer properties of headgear have been determined in chamber studies using a physical model (copper manikin). The evaporative heat transfer (im/clo) from a head in 'still' air was constant above a standoff distance of 1.270 cm. for helmets with a constant head area coverage (67%). Reducing the head area coverage from 67% to about 50% was necessary to increase the evaporative heat transfer for a helmet standoff distance of 1.270 cm. The effect of wind on the heat transfer properties of selected headgear with varying designs was to decrease the values of insulation (clo) by about 60% and increase those for the evaporative heat transfer (im/clo) by about 4 times the 'still' air values.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0783434

Entities

People

  • G. F. Fonseca

Organizations

  • United States Army Soldier Systems Center

Tags

DTIC Thesaurus Topics

  • Air Flow
  • Air Temperature
  • Area Coverage
  • Army
  • Clothing
  • Environment
  • Heat Loss
  • Heat Transfer
  • Infantry
  • Insulation
  • Massachusetts
  • Materials
  • Military Research
  • Riot Control
  • Security
  • Standoff
  • Temperature Gradients

Readers

  • Combustion and Flow Dynamics.
  • Military Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems