Heat Transfer Properties of Military Protective Headgear
ARMY NATICK LABS MA CLOTHING AND PERSONAL LIFE SUPPORT EQUIPMENT LAB
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The heat transfer properties of headgear have been determined in chamber studies using a physical model copper manikin. The evaporative heat transfer imclo 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 imclo by about 4 times the still air values.
- Protective Equipment