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Journal article

Effect of heterogenous and homogenous air gaps on dry heat loss through the garment.

  • Mert E Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland.
  • Psikuta A Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland. agnes.psikuta@empa.ch.
  • Bueno MA Université de Haute Alsace Haute Alsace, Laboratoire de Physique et Mécanique Textiles, Ecole Nationale Supérieure d'Ingénieurs Sud Alsace, Mulhouse, France.
  • Rossi RM Empa, Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland.
  • 2015-03-23
Published in:
  • International journal of biometeorology. - 2015
Air gap
Clothing model
Contact area
Dry heat transfer
Natural convection
Air
Clothing
Convection
Hot Temperature
Models, Theoretical
English In real life conditions, the trapped air between the human body and the garment has uneven shape and vary over the body parts as a consequence of the complex geometry of the human body. However, the existing clothing models assume uniform air layer between the human body and the garment or its full contact, which may cause large error in the output of simulations. Therefore, the aim of this study was to investigate the effect of a heterogeneous vertical air gap with different configuration of folds (size and frequency) on dry heat loss using a heated cylinder (Torso). It was found that the presence of folds in the garment led to an increased heat loss from the body in comparison to a homogeneous air gap of comparable size. Interestingly, the size of folds did not have an influence on the dry heat loss. Additionally, the effect of the contact area on dry heat loss became important when exceeding a threshold of about 42%. The results from this study are useful for modelling of a realistic dry heat loss through the clothing and contribute to the improvement of design of protective and active sport garments.
Language
  • English
Open access status
green
Identifiers
Persistent URL
https://sonar.ch/global/documents/62409
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