We have conducted wearer trials demonstrating that human subjects can perceive the heat of sorption of water vapor by wool garments in typical winter conditions. We found that this heat of sorption causes wearers to rate wool garments as warmer under certain conditions than materials with little or no heat of sorption, such as acrylic. If the garments are thoroughly dried before use, the full benefit of this heating effect is realized.
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References
1.
Bazett, H.C. , Mendelson, E.S., Love , L., and Libet, B., Precooling of Blood in the Arteries, Effective Heat Capacity and Evaporative Cooling as Factors Modifying Cooling of the Extremities. J. Appl. Physiol.1, 169-182 (1948).
2.
David, H.G., TheEffect of Changing Humidity on the Insulation of Hygroscopic Clothing, Textile Res. J.35, 820 (1965).
3.
De Dear, R.J. , Tanabe, S., Knudsen , H.N., Pejtersen, J., Mackeprang, J., and Fanger, P.O., Thermal Response of Wool Clothing during Humidity Transients, paper presented at Indoor Air Conference Berlin, 1987.
4.
Farnworth, B. , A Numerical Model of the Combined Diffusion of Heat and Water Vapor through Clothing, Textile Res. J.56, 653-665 (1986).
5.
Hensel, H., Thermoreception and Temperature Regulation, Monographs of the Physiological Society, No. 38, Academic Press, London, 1981, (a) no. 3.2, (b) no. 3.3, (c) no. 12.1.
6.
Holmer, I., Heat Exchange and ThermalInsulation Compared in Woolen and Nylon Garments During Wear Trials, Textile Res. J.55, 511-518 (1985).
Renboume, E.T., and Rees, W.H., "Materials and Clothing in Health and Disease," H. K. Lewis & Co. Ltd., London, 1972, p. 178.
9.
Rodwell, E.C. , Renboum, E.T., Greenland , J., and Kenchington , K.W.L., AnInvestigation of the Physiological Value of Sorption Heat in Clothing Assemblies, J. Textile Inst.56, T624 (1965).
10.
Roff, W.J., and Scott, J.R., "Fibres, Films, Plastics and Rubbers," Butterworth , London, 1971.
11.
Schneider, A.M., Heat Transfer in Moist Fabrics, Doctoral thesis, University of New South Wales, 1987.
12.
Watt, I.C., and McMahon, G.B., TheEffects of Heat of Sorption in the Wool-Water Sorption System, Textile Res. J.37, 738-745 (1966).
13.
Watt, I.C., Sorption of Water Vapor by Keratin, J. Macromol. Sci. Rev. Macromol. Chem. C18 (2), 169-245 (1980).
