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Localised boundary air layer and clothing evaporative resistances for individual body segments.

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Author

  • Faming Wang
  • Simona Del Ferraro
  • Li-Yen Lin
  • Tiago Sotto Mayor
  • Vincenzo Molinaro
  • Miguel Ribeiro
  • Chuansi Gao
  • Kalev Kuklane
  • Ingvar Holmér

Summary, in English

Evaporative resistance is an important parameter to characterise clothing thermal comfort. However, previous work has focused mainly on either total static or dynamic evaporative resistance. There is a lack of investigation of localised clothing evaporative resistance. The objective of this study was to study localised evaporative resistance using sweating thermal manikins. The individual and interaction effects of air and body movements on localised resultant evaporative resistance were examined in a strict protocol. The boundary air layer's localised evaporative resistance was investigated on nude sweating manikins at three different air velocity levels (0.18, 0.48 and 0.78 m/s) and three different walking speeds (0, 0.96 and 1.17 m/s). Similarly, localised clothing evaporative resistance was measured on sweating manikins at three different air velocities (0.13, 0.48 and 0.70 m/s) and three walking speeds (0, 0.96 and 1.17 m/s). Results showed that the wind speed has distinct effects on local body segments. In contrast, walking speed brought much more effect on the limbs, such as thigh and forearm, than on body torso, such as back and waist. In addition, the combined effect of body and air movement on localised evaporative resistance demonstrated that the walking effect has more influence on the extremities than on the torso. Therefore, localised evaporative resistance values should be provided when reporting test results in order to clearly describe clothing local moisture transfer characteristics. Practitioner Summary: Localised boundary air layer and clothing evaporative resistances are essential data for clothing design and assessment of thermal comfort. A comprehensive understanding of the effects of air and body movement on localised evaporative resistance is also necessary by both textile and apparel researchers and industry.

Publishing year

2012

Language

English

Pages

799-812

Publication/Series

Ergonomics

Volume

55

Issue

7

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Production Engineering, Human Work Science and Ergonomics

Keywords

  • localised evaporative resistance
  • sweating thermal manikin
  • clothing ensemble
  • boundary air layer
  • reduction factor

Status

Published

Research group

  • Thermal Environment Laboratory

ISBN/ISSN/Other

  • ISSN: 0014-0139