Physiological Factors in Protective Helmet Design

Abstract

The heat transfer properties of protective headgear have been determined in chamber studies using a physical model (copper manikin). The evaporative heat transfer (i(sub m)/clo) from a head in 'still' air was constant above a standoff distance of 1.27 cm. for helmets with a constant head area coverage (67%). Reducing the head area coverage from 67% to 47% was necessary to significantly increase the evaporative heat transfer for a helmet standoff distance of 1.27 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 (i(sub m)/clo) by about 4 times the 'still' air values.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1976
Accession Number
ADA051273

Entities

People

  • George F. Fonseca

Organizations

  • United States Army Research Institute of Environmental Medicine

Tags

DTIC Thesaurus Topics

  • Air Flow
  • Air Temperature
  • Area Coverage
  • Environment
  • Heat Loss
  • Heat Transfer
  • Human Factors Engineering
  • Infantry
  • Insulation
  • Losses
  • Materials
  • Measurement
  • Riot Control
  • Riots
  • Standards
  • Standoff
  • Temperature Gradients

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Materials Science

Technology Areas

  • Microelectronics