Accession Number:

ADA162026

Title:

Effectiveness of an Air-Cooled Vest Using Selected Air Temperature and Humidity Combinations,

Descriptive Note:

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Report Date:

1985-11-01

Pagination or Media Count:

25.0

Abstract:

We evaluated the effectiveness of an air-cooled vest in reducing thermal strain when supplied with five different dry bulb db and dew point dp temperature combinations. The combinations were selected to determine minimal air conditioning requirements for various military vehicles. Four male soldiers attempted twelve, 300-min heat exposures 49 C db, 20 C dp at metabolic rates of 175 and 315 W. They wore chemical protective clothing over the combat vehicle crewman uniform on ten of the test days, they also wore the air-cooled vest. Air supplied to the vest ranged from 20-27 C db, 7-18 C dp. Without the vest, endurance times were 118 min 175 W and 73 min 315 W. Endurance times with the vest were 300 min 175 W and 242-300 min 315 W. Rectal temperatures, heart rates and sweating rates were reduced dramatically with the air at the lower dry bulb temperature. We conclude that effective combinations of cooled and dehumidified air can be provided on military vehicles to reduce the crewmens thermal strain, with minimized size and weight penalties.

Subject Categories:

  • Stress Physiology
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE