ENHANCED VARIABLE INSULATION CLOTHING

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Authors
  1. Uglene, W.V.
  2. Nistuk, R.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Mustang Survival Research Div, Richmond BC (CAN)
Abstract
A stubbornly intractable problem in the design of military clothing, especially for cold weather use, is the provision of means to rapidly and conveniently vary the insulation in response to changing environmental conditions or activity. The natural mechanisms for human thermoregulation are limited to vasomotor changes, shivering, and sweating. Clothing insulation is required when the potential for heat loss exceeds heat production. However, when heat production exceeds heat loss (e.g., due to increased activity), sweating may occur and the resultant condensation of water in the clothing will compromise the clothing's insulation value. A variable insulation garment would alleviate this common problem. The present project investigated alternative approaches to designing a variable insulation garment. One class of approaches involved simple mechanical concepts; the other considered new technologies with a potential application to clothing. The former included: (1) zippers, gussets, and bellows; (2) layers with off-set slits; (3) inflatable channels; and (4) telescopic sleeves. The latter included: (1) shape memory fibres; (2) thermoelectric devices; (3) phase change materials; and (4) heat pipe cycles. Following a theoretical assessment, thermoelectric devices offered the greatest advantage, and zippers and gussets were calculated to provide the best means of changing insulation in the arms of a garment. TRUNCATED
Keywords
Thermoelectric modules;Sweating
Report Number
DCIEM-97-CR-14 — Contractor Report
Date of publication
01 Jun 1997
Number of Pages
90
DSTKIM No
97-03937
CANDIS No
504209
Format(s):
Hardcopy;Document Image stored on Optical Disk

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