Dry Thermal Insulation of Thick Clothing

This report presents a physical analysis of an insulated cylinder system in use in this laboratory and insulating values or thermal resistances per unit thickness obtained on certain types of clothing materials under dry conditions. The over-all heat flow rates, or over-all thermal resistance of clo...

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Bibliographic Details
Main Authors: Fourt, Lyman, Lyerly, George A, Edwards, Grant C, Poland, Eleanor D
Other Authors: HARRIS RESEARCH LABS INC WASHINGTON DC
Format: Text
Language:English
Published: 1960
Subjects:
Textiles
*EXPANDED PLASTICS
*FABRICS
*POLYURETHANE RESINS
*PROTECTIVE CLOTHING
*TEXTILES
*THERMAL INSULATION
CLOTHING
FLIGHT CLOTHING
HEAT TRANSFER
LAYERS
POLYESTER PLASTICS
SYNTHETIC FIBERS
TEST METHODS
THERMAL CONDUCTIVITY
THERMAL RESISTANCE
THICKNESS
WEAVING
WOOLEN TEXTILES
Arctic
Online Access:http://www.dtic.mil/docs/citations/ADA031488
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA031488
Description
Summary:This report presents a physical analysis of an insulated cylinder system in use in this laboratory and insulating values or thermal resistances per unit thickness obtained on certain types of clothing materials under dry conditions. The over-all heat flow rates, or over-all thermal resistance of clothing assemblies, which have been used for greater-than-or-less-than comparisons in previous reports, have been refined to come closer to being measurements of the thermal resistance of particular layers, by making more accurate corrections for heat losses through the insulated ends of the test equipment, and by measuring temperature gradients through the clothing itself. As a system for measuring thermal resistance, the cylinder used in this laboratory is best suited to layers ranging in thickness from 0.2 to 2.0 or 2.5 cm. This extends to heavy arctic or flying clothing. The intrinsic thermal resistance of a polyurethane foam was found to be 0.30 degree C sq.m/watt cm or 4.9 Clo per inch. This appears to be more insulation per unit thickness than for woven fabrics. White the usual 'practical' value for clothing plus air layers is 4 Clo/inch, the thermal conductivity for still air is close to 7 Clo per inch, so these thick, low density layers of foams or batts may offer a real increase in insulation over woven or knitted textile structures.

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