The Effects of Wave Conditions on Dry Immersion Suit Insulation: A Comparison Between Humans and Mannikin

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Authors
  1. Ducharme, M.B.
  2. Brooks, C.J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The objective of the present study was to investigate the effect of standard wave conditions (0 to 70 cm) on dry immersion suit insulation when tested on humans and a mannikin simultaneously. Six human subjects and a thermal mannikin dressed with the same dry immersion suit system (pile undergarment insulation, uninsulated immersion suit and neoprene gloves and hood) were immersed simultaneously for one hour in 16C water rendered turbulent with an irregular wave pattern. One immersion was performed for each randomly chosen wave condition, from 0 to 70 cm wave height, changing by steps of 10 cm. In addition to the physiological parameters measured on the human subjects (skin and rectal temperatures, skin heat loss and heart rate), and the ambient temperature of water and air, heat fluxes and surface temperatures were measured at 12 sites on the subjects and mannikin for each compartment of the dry suit system (skin, pile garment, suit garment). This allowed the calculation of the thermal resistance of every suit compartment in addition to the air and water boundary layer surrounding the suit. The results showed that none of the physiological parameters were significantly affected by the wave conditions, except for the skin heat flux which increased with the wave height from 72.0 + or - 1.9 W - m 2(-) at 0 cm to 85.5 + or - 2.9 W - M 2(-) at 70 cm. TRUNCATED
Keywords
Wave conditions;Thermal instrumented manikins;Immersion suits
Report Number
DCIEM-96-R-46 —
Date of publication
01 Apr 1996
Number of Pages
42
DSTKIM No
96-03443
CANDIS No
499430
Format(s):
Hardcopy;Document Image stored on Optical Disk

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