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The torso cooling of vests incorporated with phase change materials: a sweat evaporation perspective

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Author

  • Mengmeng Zhao
  • Chuansi Gao
  • Faming Wang
  • Kalev Kuklane
  • Ingvar Holmér
  • Jun Li

Summary, in English

Cooling vests incorporated with phase change materials (PCMs) add extra insulation and restrict sweat evaporation. It is still unclear how much cooling benefit they can provide. The aim of this study was to investigate the torso cooling of the PCM vests in two hot environments: hot humid (HH, 34C, 75% relative humidity (RH)) and hot dry (HD, 34C, 37% RH). A pre-wetted torso fabric skin was used to simulate torso sweating on a thermal manikin. Three cooling vests incorporated with three melting temperatures (Tm) of PCMs were tested (Tm=21C, Tm=24C and Tm=28C). They were worn under a military ensemble (total thermal insulation 1.60 clo; evaporative resistance 0.0516 kPam2/W), respectively. In a HH environment all the three cooling vests provided effective torso cooling; in a HD environment the cooling benefit was negative. In both environmental conditions, the evaporative cooling was greatly restricted by the cooling vests. The study indicated that when wearing the protective clothing with the relatively low evaporative resistance and when sweat production was high, the cooling vests were effective in a HH environment, but not in a HD environment.

Publishing year

2013

Language

English

Pages

418-425

Publication/Series

Textile Research Journal

Volume

83

Issue

4

Document type

Journal article

Publisher

SAGE Publications

Topic

  • Production Engineering, Human Work Science and Ergonomics

Keywords

  • evaporation
  • phase change material
  • cooling
  • protective clothing

Status

Published

Research group

  • Thermal Environment Laboratory

ISBN/ISSN/Other

  • ISSN: 0040-5175