Physiological Factors in Protective Helmet Design
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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The heat transfer properties of protective headgear have been determined in chamber studies using a physical model copper manikin. The evaporative heat transfer isub mclo 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 isub mclo by about 4 times the still air values.
- Stress Physiology
- Protective Equipment