Experimental and Analytical Investigation of Moisture Movement in Clothing

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1177/1744259107081648Journal of Building Physics, 31, pp. 125-142, 2007-10-01 Experimental and analytical investigation of moisture movement in clothing Takada, S.; Hokoi, S.; Kumaran, M. K. Journal of Building Physics, 31, no. 2, pp. 125 -142, October 01, 2007, DOI: 10.1177 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. AbstractIn order to design an efficient air-conditioning system, the specifics of the transient thermal and physiological responses of a human body to the hygrothermal environment should be taken into account. This response will strongly depend on the behavior of heat and moisture transport, and moisture accumulation in the clothing, especially when sweat exists in and around the clothing. As a basic information on this problem, a model of the moisture transfer in cloth is necessary.In this paper, a model of the liquid moisture movement in clothing under gravity is developed and applied, based on a diffusion model. Firstly, the moisture diffusivity is determined from the investigation of the moisture absorption process in the horizontal direction where gravity has no influence on the moisture movement. Secondly with the use of the moisture diffusivity thus determined, a moisture absorption process in the upward direction against gravity is investigated. The validity of the parameter related to the gravity effect is examined by comparing the results of numerical calculations with the experimental results obtained from the gamma-ray method. Since the two agree generally well, the parameters viz. liquid moisture diffusivity and sorption isotherm derived here for a sample of broadcloth are considered reliable.

Effect of air pressure on moisture transfer inside porous building materials

“…The gamma(c)-ray-attenuation method permits the continuous measurement of water content without deteriorating the target and is thus widely used in the field of soil science and building engineering. [11][12][13] Ogura and Hokoi 11 confirmed the validity of such measurements with the apparatus used in the present work. The volumetric water content may be determined from the fraction of c rays absorbed in the specimen, which is expressed as 12…”

“…The gamma(γ)‐ray‐attenuation method permits the continuous measurement of water content without deteriorating the target and is thus widely used in the field of soil science and building engineering . Ogura and Hokoi confirmed the validity of such measurements with the apparatus used in the present work.…”

Single-sector thermophysiological human simulator

“…Nonetheless, the combined effects of the inhomogenous dynamic heat and mass transfer processes in clothing are either difficult to characterize or not yet well understood, e.g. evaporation, condensation and moisture migration processes in multi-layer clothing systems (Keiser 2007, Fan and Cheng 2005a, Takada et al 2007, Chen et al 2003, Havenith et al 2007.…”