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The purpose of this study was to investigate the effect of moisture on the heat transfer through clothing in relation to the water vapour resistance, type of underwear, location of the moisture and climate. This forms part of the work performed for work package 2 of the European Union THERMPROTECT project. Thermal manikin results of dry and wet heat loss are presented from different laboratories for a range of 2-layer clothing with similar dry insulations but different water vapour permeabilities and absorptive properties. The results obtained from the different manikins are generally consistent with one another. For each climate, total wet heat loss is predominately dependent on the permeability of the outer layer. At 10 °C, the apparent evaporative heat loss is markedly higher than expected from evaporation alone (measured at 34 °C), which is attributed to condensation within the clothing and to increased conductivity of the wet clothing layers.
Słowa kluczowe
Wydawca
Rocznik
Tom
Strony
69--76
Opis fizyczny
Bibliogr. 25 poz., tab., wykr.
Twórcy
autor
- EMPA, Swiss Federal Laboratories for Materials Testing and Research, St. Gallen, Switzerland
autor
- EMPA, Swiss Federal Laboratories for Materials Testing and Research, St. Gallen, Switzerland
autor
- Tampere University of Technology, Tampere, Finland
autor
- Institut fur Arbeitsphysiologie an der Universitat Dortmund, Dortmund, Germany
autor
- Centre National de la Recherche Scientifique, Strasbourg, France
autor
- TNO, The Netherlands
autor
- Lund University, Lund, Sweden
autor
- W.L. Gore, Germany
autor
- Department of Human Sciences, Loughborough University, Loughborough, UK
Bibliografia
- 1.Lotens WA, Vandelinde FJG, Havenith G. Effects of condensation in clothing on heat-transfer. Ergonomics. 1995;38(6):1114–31.
- 2.Farnworth B. A numerical-model of the combined diffusion of heat and water-vapor through clothing. Text Res J. 1986;56(11):653–65.
- 3.Spencer-Smith JL. The physical basis of clothing comfort, part 4: the passage of heat and water through damp clothing assemblies. Clothing Research Journal. 1977;5:116–28.
- 4.Cheung SS, McLellan TM, Tenaglia S. The thermophysiology of uncompensable heat stress—physiological manipulations and individual characteristics. Sports Medicine. 2000;29(5):329–59.
- 5.Parsons KC. Human thermal environments. London, UK: Taylor & Francis; 2003.
- 6.Malchaire J, Piette A, Kampmann B, Mehnert P, Gebhardt H, Havenith G, et al. Development and validation of the predicted heat strain model. Ann Occup Hyg. 2001;45(2):123–35.
- 7.Holmer I. Protective clothing and heat stress. Ergonomics. 1995;38(1):166–82.
- 8.Li Y, Zhu QY. A model of coupled liquid moisture and heat transfer in porous textiles with consideration of gravity. Numerical Heat Transfer. Part A, Applications. 2003;43(5):501–23.
- 9.Gibson PW, Charmchi M. Coupled heat and mass transfer through hygroscopic porous materials: application to clothing layers. Sen-I Gakkaishi. 1997;53(5):183–94.
- 10.Fan J, Cheng X, Wen X, Sun W. An improved model of heat and moisture transfer with phase change and mobile condensates in fibrous insulation and comparison with experimental results. International Journal of Heat and Mass Transfer. 2004;47(10–11):2343–52.
- 11.Blatteis C, Boulant J, Cabanac M, Cannon B, Freedman R, Gordon, et al. Glossary of terms for thermal physiology. Jpn J Physiol. 2001;51(2):245–80.
- 12.Havenith G, Holmer I, Mainander H, den Hartog E, Richards MGM, Brode P, et al. Assessment of thermal properties of protective clothing and their use. Final THERMPROTECT Technical Report, European Union Contract G6RD-CT-2002-00846; 2005.
- 13.European Committee for Standardization (CEN). Textiles—determination of physiological properties—measurement of thermal and water-vapour resistance under steady state conditions (sweating guarded-hotplate test) (ISO 11092:1993) (Standard No. EN 31092:1993). Brussels, Belgium: CEN; 1993.
- 14.Richards MGM, Mattle NG. A Sweating agile thermal manikin (SAM) developed to test complete clothing systems under normal and extreme conditions. In: Human Factors and Medicine Panel Symposium—Blowing Hot and Cold: Protecting Against Climatic Extremes. Dresden, Germany: RTO/NATO; 2001. p. 1–7.
- 15.Meinander H. Coppelius—a sweating thermal manikin for the assessment of functional clothing. In: Proceedings of the 4th Scandinavian Symposium on Protective Clothing Against Chemicals and Other Health Hazards (Nokobetef IV). Kittila, Finland: Finnish Institute of Occupational Health; 1992. p. 157–61.
- 16.Havenith G, Wang X and THERMPROTECT network. Evaporative cooling in protective clothing. In: 3rd European Conference on Protective Clothing (ECPC) and NOKOBETEF 8. Protective Clothing Towards Balanced Protection [CD-ROM]. Warszawa, Poland: Central Institute for Labour Protection – National Research Institute; 2006.
- 17.International Organization for Standardization (ISO). Clothing—physiological effects—measurement of thermal insulation by means of a thermal manikin (Standard No. ISO 15831:2004). Geneva, Switzerland: ISO; 2004.
- 18.Lotens WA. Heat transfer from humans wearing clothing. Soesterberg, The Netherlands: TNO Institute for Perception; 1993.
- 19.Bakkevig MK, Nielsen R. Impact of wet underwear on thermoregulatory responses and thermal comfort in the cold. Ergonomics. 1994;37(8):1375–89.
- 20.Lawson LK, Crown EM, Ackerman MY, Dale JD. Moisture effects in heat transfer through clothing systems for wildland firefighters. International Journal of Occupational Safety and Ergonomics (JOSE). 2004;10(3):227–38.
- 21.Richards MGM. Study of materials to investigate the effects of moisture on the heat transfer through protective clothing. Report on Project THERMPROTECT, European Union Contract G6RD-CT-2002-00846; 2004.
- 22.Rossi RM, Gross R, May M. Water vapour transfer and condensation effects in multilayer textile combinations. Text Res J. 2004;74(1);1–6.
- 23.Havenith G, Richards MGM, Wang X, Brode P, Candas V, den Hartog E, et al. Apparent latent heat of evaporation from clothing: attenuation and “heat pipe” effects. J Appl Physiol. 2008;104:142–9.
- 24.Richards MGM, Broede P, Candas V, den Hartog E, Havenith G, Holmer I, et al. Effects of moisture on the heat transfer through protective clothing. In: Proceedings of the International Conference on Environmental Ergonomics [CD-ROM]. Ystad, Sweden; 2005.
- 25.Richards MGM, McCullough EA. Revised interlaboratory study of sweating thermal manikins including results from the sweating agile thermal manikin. Journal of ASTM International. 2005;2(4):27–39.
Typ dokumentu
Bibliografia
Identyfikator YADDA
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