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Thermal Insulation of Protective Clothing Materials in Extreme Cold Conditions

  • Mohamed Zemzem (Dept. of Environmental and Occupational Health, University of Montreal) ;
  • Stephane Halle (Dept. of Mechanical Engineering, Ecole de Technologie Superieure) ;
  • Ludwig Vinches (Dept. of Environmental and Occupational Health, University of Montreal)
  • Received : 2022.05.03
  • Accepted : 2022.11.18
  • Published : 2023.03.30

Abstract

Background: Thermophysiological comfort in a cold environment is mainly ensured by clothing. However, the thermal performance and protective abilities of textile fabrics may be sensitive to extreme environmental conditions. This article evaluated the thermal insulation properties of three technical textile assemblies and determined the influence of environmental parameters (temperature, humidity, and wind speed) on their insulation capacity. Methods: Thermal insulation capacity and air permeability of the assemblies were determined experimentally. A sweating-guarded hotplate apparatus, commonly called the "skin model," based on International Organization for Standardization (ISO) 11092 standard and simulating the heat transfer from the body surface to the environment through clothing material, was adopted for the thermal resistance measurements. Results: It was found that the assemblies lost about 85% of their thermal insulation with increasing wind speed from 0 to 16 km/h. Under certain conditions, values approaching 1 clo have been measured. On the other hand, the results showed that temperature variation in the range (-40℃, 30℃), as well as humidity ratio changes (5 g/kg, 20 g/kg), had a limited influence on the thermal insulation of the studied assemblies. Conclusion: The present study showed that the most important variable impacting the thermal performance and protective abilities of textile fabrics is the wind speed, a parameter not taken into account by ISO 11092.

Keywords

Acknowledgement

The authors would like to express their gratitude to industrial collaborators in Logistic Unicorps; Mr. Mehdi Ben Salah and Mrs. Fanny Chainiau. The authors also thank Mrs. Justine Decaens, Francois Turcotte, and Rachelle Lemonde from CTT Group for assistance and guidance that greatly improved the work made in this article. Finally, the authors thank Pr. Jerome Lavoue from the Department of Environmental and Occupational Health of the School of Public Health of the University of Montreal for his advices in statistical analyses.

References

  1. Ray M, King M, Carnahan H. A review of cold exposure and manual performance: implications for safety, training and performance. Saf Sci 2019;115:1-11. https://doi.org/10.1016/j.ssci.2019.01.014
  2. ISO12894. Ergonomics of the thermal environment d medical supervision of individuals exposed to extreme hot or cold environments; 2001. 30 p.
  3. Rathjen NA, Shahbodaghi SD, Brown JA. Hypothermia and cold weather injuries. Am Fam Physician 2019;100(11):680-6.
  4. Watson C, Troynikov O, Lingard H. Design considerations for low-level risk personal protective clothing: a review. Ind Health 2019;57(3):306-25. https://doi.org/10.2486/indhealth.2018-0040
  5. Williams JT. Textiles for cold weather apparel. 1st ed. Elsevier Science; 2009. 432 p.
  6. ISO11920. Textiles e physiological effects - measurement of thermal and water vapour resistance under steady-state conditions (sweating guarded hot plate test); 2014. 22 p.
  7. Havelka A, Glombikova V, Kus Z, Chotebor M. The thermal insulation properties of hightech sportswear fillings. Int J Cloth Sci Technol 2015;27(4):549-60. https://doi.org/10.1108/IJCST-03-2014-0038
  8. Ke Y, Havenith G, Li J, Li X. A new experimental study of influence of fabric permeability, clothing sizes, openings and wind on regional ventilation rates. Fibers Polym 2013;14(11). 1906-1.
  9. Ke Y, Havenith G, Zhang X, Li X, Li J. Effects of wind and clothing apertures on local clothing ventilation rates and thermal insulation. Text Res J 2014;84(9):941-52. https://doi.org/10.1177/0040517513512399
  10. ISO09920. Ergonomics of the thermal environment - estimation of thermal insulation and water vapour resistance of a clothing ensemble; 2007. 112 p.
  11. Glombikova V, Komarkova P, Hercikova E, Havelka A. How high-loft textile thermal insulation properties depend on compressibility. Autex Res J 2020;20(3):338-43. https://doi.org/10.2478/aut-2019-0015
  12. Huang J. Sweating guarded hot plate test method. Polym Test 2006;25(5):709-16. https://doi.org/10.1016/j.polymertesting.2006.03.002
  13. Salmon D. Thermal conductivity of insulations using guarded hot plates, including recent developments and sources of reference materials. Meas Sci Technol 2001;12(12):R89.
  14. Tleoubaev A, Brzezinski A, editors. Combined guarded-hot-plate and heat flow meter method for absolute thermal conductivity tests excluding thermal contact resistance thermal conductivity 27/thermal expansion 15. 15th thermal expansion conference, thermal conductivity 2003.
  15. Minitab. 2022. Available from: https://www.minitab.com/en-us/.
  16. Drochytka R, Dvorakova M, Hodna J. Performance evaluation and research of alternative thermal insulation based on waste polyester fibers. Procedia Eng 2017;195:236-43. https://doi.org/10.1016/j.proeng.2017.04.549
  17. Bouskill L, Havenith G, Kuklane K, Parsons K, Withey W. Relationship between clothing ventilation and thermal insulation. AIHA J 2002;63(3):262-8. https://doi.org/10.1080/15428110208984712
  18. Holm I, Nilsson H, Anttonen H. Prediction of wind effects on cold protective clothing, NATO. RTO-MP-076; 20016.1-6.
  19. Holmer I, Nilsson H, Havenith G, Parsons K. Clothing convective heat Exchange-proposal for improved prediction in standards and models. Ann Occup Hyg 1999;43(5):329-37. https://doi.org/10.1016/S0003-4878(99)00057-5
  20. ASTMD737-18. Methode d'essai standard pour la permeabilite a l'air des tissus textiles. 5 p.