Evaluation of an electrically heated vest (EHV) using a thermal manikin in cold environments

Faming Wang, Hansup Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

We studied the heating efficiency of an electrically heated vest (EHV), its relationship to the microclimate temperature distribution in a three-layer clothing ensemble, and the effect of an EHV on the clothing's total thermal insulation by both theoretical analysis and thermal manikin measurements. The heat losses at different ambient conditions and heating states were recorded and the heating efficiency of the EHV was calculated. It was found that the EHV can alter the microclimatic temperature distribution of the three-layer clothing ensemble. The EHV can provide an air temperature of 34°C around the manikin's torso skin. The highest temperature on the outside surface of the EHV was around 38°C, which indicates that it is safe for the consumer. The higher the heating temperature, the lower the heating efficiency obtained. This was due to much more heat being lost to the environment, and hence, the heat gain from the EHV was smaller. The heating efficiency decreased from 55.3% at 0°C to 27.4% at -10°C when the heating power was set at 13 W. We suggest adjusting the heating power to 5 W (step 1) at an ambient temperature of 0°C, while at -10°C using 13 W (step 3) to provide the consumer a thermal comfort condition.
Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalAnnals of Occupational Hygiene
Volume54
Issue number1
DOIs
Publication statusPublished - 1 Jan 2010
Externally publishedYes

Keywords

  • Cold environment
  • Electrically heated vest
  • Heating efficiency
  • Microclimate temperature
  • Thermal manikin

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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