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Effects of Air Velocity and Clothing Combination on Heating Efficiency of an Electrically Heated Vest (EHV): A Pilot Study

Wang, Faming LU ; Gao, Chuansi LU and Holmér, Ingvar LU (2010) In Journal of Occupational and Environmental Hygiene2004-01-01+01:00 7(9). p.501-505
Abstract
Cold endangers the heat balance of the human body. Protective clothing is the natural and most common equipment against cold stress. However, clothing for cold protection may be bulky and heavy, affecting human performance and increasing the work load. In such cases, a heated garment with built-in heating elements may be helpful. This pilot study presents a method based on a thermal manikin to investigate the effects of air velocity and clothing combination on the heating efficiency of an electrically heated vest (EHV). An infrared thermal camera was used to detect surface temperature distributions of the EHV on the front and back. Results show that the heating efficiency of the EHV decreases with increasing air velocity. Changes in EHV... (More)
Cold endangers the heat balance of the human body. Protective clothing is the natural and most common equipment against cold stress. However, clothing for cold protection may be bulky and heavy, affecting human performance and increasing the work load. In such cases, a heated garment with built-in heating elements may be helpful. This pilot study presents a method based on a thermal manikin to investigate the effects of air velocity and clothing combination on the heating efficiency of an electrically heated vest (EHV). An infrared thermal camera was used to detect surface temperature distributions of the EHV on the front and back. Results show that the heating efficiency of the EHV decreases with increasing air velocity. Changes in EHV sequence in the three-layer clothing combination also significantly affect the heating efficiency: it increases with the increasing number of layers on top of the EHV. The highest mean temperature on the inner surface of the EHV was 40.2°C, which indicates that it is safe for the wearers. For the EHV to heat the human body effectively, we suggest that it be worn as a middle layer. Finally, the EHV is especially suitable for occupational groups whose metabolic rate is below 1.9 Mets. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
infrared thermography, heating efficiency, electrically heated vest (EHV), cold environment, air velocity, clothing combination
in
Journal of Occupational and Environmental Hygiene2004-01-01+01:00
volume
7
issue
9
pages
501 - 505
publisher
Taylor & Francis
external identifiers
  • wos:000278790500002
  • pmid:20552501
  • scopus:77953656427
ISSN
1545-9632
DOI
10.1080/15459624.2010.486696
language
English
LU publication?
yes
id
4350f32e-e09e-4619-8d71-d0975d9c6a29 (old id 1628331)
date added to LUP
2010-07-20 09:15:46
date last changed
2018-07-15 03:49:19
@article{4350f32e-e09e-4619-8d71-d0975d9c6a29,
  abstract     = {Cold endangers the heat balance of the human body. Protective clothing is the natural and most common equipment against cold stress. However, clothing for cold protection may be bulky and heavy, affecting human performance and increasing the work load. In such cases, a heated garment with built-in heating elements may be helpful. This pilot study presents a method based on a thermal manikin to investigate the effects of air velocity and clothing combination on the heating efficiency of an electrically heated vest (EHV). An infrared thermal camera was used to detect surface temperature distributions of the EHV on the front and back. Results show that the heating efficiency of the EHV decreases with increasing air velocity. Changes in EHV sequence in the three-layer clothing combination also significantly affect the heating efficiency: it increases with the increasing number of layers on top of the EHV. The highest mean temperature on the inner surface of the EHV was 40.2°C, which indicates that it is safe for the wearers. For the EHV to heat the human body effectively, we suggest that it be worn as a middle layer. Finally, the EHV is especially suitable for occupational groups whose metabolic rate is below 1.9 Mets.},
  author       = {Wang, Faming and Gao, Chuansi and Holmér, Ingvar},
  issn         = {1545-9632},
  keyword      = {infrared thermography,heating efficiency,electrically heated vest (EHV),cold environment,air velocity,clothing combination},
  language     = {eng},
  number       = {9},
  pages        = {501--505},
  publisher    = {Taylor & Francis},
  series       = {Journal of Occupational and Environmental Hygiene2004-01-01+01:00},
  title        = {Effects of Air Velocity and Clothing Combination on Heating Efficiency of an Electrically Heated Vest (EHV): A Pilot Study},
  url          = {http://dx.doi.org/10.1080/15459624.2010.486696},
  volume       = {7},
  year         = {2010},
}