The purpose of this research work is to investigate the influence of phase-change materials (PCMs) on thermo-physiological comfort of different male business clothing systems evaluated in warm environment. The impact of particular business clothing on the thermo-physiological comfort of the wearer during different physical activity and environmental conditions (between 25°C and 10°C with step of 5°C), artificially created in a climate chamber, was determined experimentally, as a change of three physiological parameters of a human being: mean skin temperature, heart rate, and the amount of evaporated and condensed sweat. A questionnaire and an assessment scale were also used before, during, and after each experiment in order to evaluate the wearer’s subjective feeling of comfort. The results of the performed research work show that male business clothing systems in combination with PCMs do not affect the thermal-physiological comfort of the wearer in warm environment significantly, except at an ambient temperature of 15°C, where clothing systems in combination with PCMs produce a small heating effect. Furthermore, it was concluded that clothing systems in combination with PCMs indicate a small temporary thermal effect that is reflected in a slight rising or lowering of mean skin temperature during activity changes. 1. Introduction Phase-change materials (PCMs), also called latent heat storage materials [1], are materials that can absorb, store, and release thermal energy as latent heat, while they go through a solid-liquid transition [2]. They were developed to regulate the human body temperature fluctuations, assuring the thermal-physiological comfort of the wearer. The most widespread PCMs in textiles are paraffin waxes (alkyl hydrocarbons such as eicosane, nonadecane, octadecane, etc.) with various phase change temperatures (melting and crystallization, i.e., freezing points) depending on their carbon numbers [3]. These liquid hydrocarbons are enclosed in microcapsules, a few microns in diameter. The microcapsule prevents leakage of the material during its liquid phase [2]. The microencapsulation of the PCMs involves enclosing them in thin and resilient polymer shells, so that the PCMs can be changed from solid to liquid and back again within the shells [3]. Microcapsules of phase-change materials can be incorporated into the spinning dope of manufactured fibres (e.g., acrylic, viscose), incorporated into the structure of foams and coated on the textile surface [2]. The developers and producers of PCMs in textile claim that garments made with PCMs
References
[1]
X. Zhang, “Heat-storage and thermo-regulated textiles and clothing,” in Smart Fibres, Fabrics and Clothing, X. Tao, Ed., pp. 34–57, Woodhead, Cambridge, UK, 2001.
[2]
E. A. McCullough and H. Shim, “The use of phase change materials in outdoor clothing,” in Intelligent Textiles and Clothing, H. R. Mattila, Ed., pp. 63–81, Woodhead, Cambridge, UK, 2006.
[3]
M. M？kinen, “Introduction to phase change materials,” in Intelligent Textiles and Clothing, H. R. Mattila, Ed., pp. 21–33, Woodhead, Cambridge, UK, 2006.
[4]
W. Bendkowska, J. Tysiak, L. Grabowski, and A. Blejzyk, “Determining temperature regulating factor for apparel fabrics containing phase change material,” International Journal of Clothing Science and Technology, vol. 17, no. 3-4, pp. 209–214, 2005.
[5]
W. Bendkowska, “Intelligent textiles with PCMs,” in Intelligent Textiles and Clothing, H. R. Mattila, Ed., pp. 34–62, Woodhead, Cambridge, UK, 2006.
[6]
K. Ghali, N. Ghaddar, J. Harathani, and B. Jones, “Experimental and numerical investigation of the effect of phase change materials on clothing during periodic ventilation,” Textile Research Journal, vol. 74, no. 3, pp. 205–214, 2004.
[7]
B. A. Ying, Y. L. Kwok, Y. Li, Q. Y. Zhu, and C. Y. Yeung, “Assessing the performance of textiles incorporating phase change materials,” Polymer Testing, vol. 23, no. 5, pp. 541–549, 2004.
[8]
L. Hes and B. I. Lu, “A new tester for evaluation of thermal efficiency of PCM fabrics in real conditions of use,” in Proceedings of the 37th International Symposium on novelties in Textiles, Naravoslovnotehni？ka fakulteta, Oddelek za tekstilstvo, Ljubljana, Slovenia, June 2007.
[9]
J. Kim and G. Cho, “Thermal storage/release, durability, and temperature sensing properties of thermostatic fabrics treated with octadecane-containing microcapsules,” Textile Research Journal, vol. 72, no. 12, pp. 1093–1098, 2002.
[10]
K. Choi, G. Cho, P. Kim, and C. Cho, “Thermal storage/release and mechanical properties of phase change materials on polyester fabrics,” Textile Research Journal, vol. 74, no. 4, pp. 292–296, 2004.
[11]
H. Shim, E. A. McCullough, and B. W. Jones, “Using phase change materials in clothing,” Textile Research Journal, vol. 71, no. 6, pp. 495–502, 2001.
[12]
H. Chung and G. Cho, “Thermal properties and physiological responses of vapor-permeable water-repellent fabrics treated with microcapsule-containing PCMs,” Textile Research Journal, vol. 74, no. 7, pp. 571–575, 2004.
[13]
S. X. Wang, Y. Li, H. Tokura, et al., “Effect of phase change materials on temperature and moisture distributions in clothing during exercise in cold environment,” Journal of Fiber Bioengineering and Informatics, vol. 1, no. 1, pp. 29–40, 2008.
[14]
D. Celcar, “Inteligentne tekstilije s fazno spremenljivimi materiali in njihov vpliv na toplotno udobje obla？il [Influence of intelligent textiles with phase-change materials on thermal comfort of clothing],” Tekstilec, vol. 55, no. 1, pp. 45–57, 2012.
[15]
K. H. Umbach, “Physiological tests and evaluation models for the optimization of the performance of protective clothing,” in Environmental Ergonomics, I. B. Mekjavic, E. W. Banister, and J. B. Morrison, Eds., pp. 139–161, Taylor and Francis, London, UK, 1988.
[16]
H. Meinander, “Introduction of a new test method for measuring heat and moisture transmission trough clothing materials and its application on winter work wear,” Tech. Rep. 24, VTT Publication, Espoo, Finland, 1985.
[17]
International Organization for Standardization, “Textiles—physiological effects—measurement of thermal and water-vapour resistance under steady-state conditions (sweating guarded-hotplate test),” ISO 11092, International Organization for Standardization, Geneva, Switzerland, 1993.
[18]
International Organization for Standardization, “Textiles-determination of thermal resistance, part 1: low thermal resistance,” ISO 5085-1, International Organization for Standardization, Geneva, Switzerland, 1989.
[19]
M. Yoneda and S. Kawabata, “Analysis of transient heat conduction and its applications, part II,” Journal of the Textile Machinery Society of Japan, vol. 31, pp. 73–81, 1983.
[20]
I. Holmér, “Thermal manikin history and applications,” European Journal of Applied Physiology, vol. 92, no. 6, pp. 614–618, 2004.
[21]
D. Celcar, H. Meinander, and J. Ger？ak, “Heat and moisture transmission properties of clothing systems evaluated by using a sweating thermal manikin under different environmental conditions,” International Journal of Clothing Science and Technology, vol. 20, no. 4, pp. 240–252, 2008.
[22]
K. C. Parsons, Human Thermal Environments. The Effects of Hot, Moderate, and Cold Environments on Human Health, Comfort and Performance, Taylor & Francis, London, UK, 2nd edition, 2003.
[23]
V. T. Bartels, “Physiological comfort of sportswear,” in Textiles in Sport, R. Shishoo, Ed., pp. 177–203, Woodhead Publishing in Association with the Textile Institute, Cambridge, UK, 2005.
[24]
International Organization for Standardization, “Ergonomics—evaluation of thermal strain by physiological measurements,” ISO 9886, International Organization for Standardization, Geneva, Switzerland, 2004.
[25]
International Organization for Standardization, “Ergonomics of the thermal environment—assessment of the influence of the thermal environment using subjective judgement scales,” ISO 10551, International Organization for Standardization, Geneva, Switzerland, 2004.
[26]
D. Celcar, J. Ger？ak, and H. Meinander, “Vrednotenje toplotnih lastnosti tekstilij in njihovih kombinacij = evaluation of textile thermal properties and their combinations,” Tekstilec, vol. 53, no. 1–3, pp. 9–32, 2010.
[27]
D. Celcar, “Raziskava subjektivnih ocen toplotnega udobja obla？il v toplem okolju = the research of subjective evaluation of clothing's thermal comfort evaluated in hot environment,” in 42. simpozij o novostih v tekstilstvu, “Nove tehnologije—da ali ne?”, 6. simpozij o novostih v grafiki, “Nove ideje!”, B. Simon？i？, Ed., Ljubljana, Slovenia, June 2011.
[28]
D. Celcar, The influence of phase change materials in business garments on thermo physiological comfort [Doctoral thesis], 2008.
