Performance of Selected Clothing Systems under Subzero Conditions: Determination of Performance by a Human-Clothing-Environment Simulator

Abstract

It is necessary to measure the performance of outdoor/protective clothing materials in terms of comfort properties under dynamic enduse conditions. A vertical type human-clothing-environment simulator was used to evaluate the thermal comfort performance of layered textile materials under dynamic conditions. Fabric layers of PET knit/fleece and PET knit/micro-porous membrane (MPM), which simulate clothing systems, were compared at a transient state from 25 to -10°C. PVC film was used to compare the effects of permeability. Relative humidity and vapor pressure data confirmed condensation on the fabric layers of the clothing systems during the transient period of temperature decrease. At the subzero condition, fabrics with low air permeability kept the water molecules on their inner surface, which deteriorates the permeability of the membranes. The vapor pressure of the air layer next to the environment was maintained at a relatively high level, which will reduce the driving force for moisture transport from sweating skin to the environment.

Keywords

human-clothing-environment simulator subzero conditions condensation microclimate temperature microclimate humidity

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References

Farnworth, B. , A Numerical Model of the Combined Diffusion of Heat and Water Vapor Through Clothing , Textile Res. J. 56(11), 653-665 (1986).

Goldman, R. F. , Assessment of Thermal Comfort , ASHRAE Trans. 84(1), 713-718 (1978).

Gretton, J. C. , Brook, D. B. , Dyson, H. M. , and Harlock, S. C. , Moisture Vapor Transport Through Waterproof Breathable Fabrics and Clothing Systems Under a Temperature Gradient , Textile Res. J. 68(12), 936-941 (1998).

Osczeski, R. J. , Water Vapor Transfer Through a Hydrophilic Film at Subzero Temperatures , Textile Res. J. 66(1), 24-29 (1996).

Volkmar T. B. , and Umbach, K. H. , Water Vapor Transport Through Protective Textiles at Low Temperatures , Textile Res. J. 72(10), 899-905 (2002).

Farnworth, B. , Lotens, W. A. , and Wittgen, P.P. M. M. , Variation of Water Vapor Resistance of Microporous and Hydrophilic Films with Relative Humidity , Textile Res. J. 60(1), 50-53 (1990).

Fohr, J. P. , Couton, D. , and Treguier, G. , Dynamic Heat and Water Transfer Through Layered Fabrics , Textile Res. J. 72(1), 1-12 (2002).

Li, Y. , Zhu, Q. , Yeung, K. W. , Influence of Thickness and Porosity on Coupled Heat and Liquid Moisture Transfer in Porous Textiles , Textile Res. J. 72(5), 435-446 (2002).

Kim, E. A. , Yoo S. J. and Kim, J. J. , Development of a Human-Clothing-Environment Simulator for Dynamic Heat and Moisture Transfer Properties of Fabrics , Fibers Polym., 4(4), 215-221 (2003)

10.

Umbach, K. H. , Physiological Tests and Evaluation Models for the Optimization of the Performance of Protective Clothing, in “Engineering Ergonomics,” I. B. Merjavic , E. W. Banister , and J. B. Morrison , Eds., Taylor and Francis, London , 1988.

11.

Yoo, H. S. , Hu, Y. S. , and Kim, E. A. , Effects of Heat and Moisture Transport in Fabrics and Garments Determined with a Vertical Plate Sweating Skin Model , Textile Res. J. 70(1), 542-549 (2000).