Advanced

Evaluation of the Performances of Electrically Heated Clothing

Wang, Faming LU (2010)
Abstract
Cold weather garments are necessary for people who are exposed to cold environments (below -5 °C). The weight and bulkiness of such a cold weather clothing ensemble may limit human activity and reduce the productivity. In order to solve these problems, a slim garment with a built-in heating element could be useful. The heat input power and heating efficiency are the two most important parameters for a piece of heated clothing. The input power determines how much heat can be released from the whole clothing system, while the heating efficiency demonstrates how many percent of the thermal energy could effectively contribute to wearers. However, previous studies have mainly focused on heat input power and there is a lack of knowledge about... (More)
Cold weather garments are necessary for people who are exposed to cold environments (below -5 °C). The weight and bulkiness of such a cold weather clothing ensemble may limit human activity and reduce the productivity. In order to solve these problems, a slim garment with a built-in heating element could be useful. The heat input power and heating efficiency are the two most important parameters for a piece of heated clothing. The input power determines how much heat can be released from the whole clothing system, while the heating efficiency demonstrates how many percent of the thermal energy could effectively contribute to wearers. However, previous studies have mainly focused on heat input power and there is a lack of knowledge about the heating efficiency of the heated clothing.

In this thesis, performances of electrically heated garments were compared and evaluated on two thermal manikins. The factors that affect on the clothing heating efficiency were thoroughly studied. It was found that the ambient temperature (or temperature gradient), air velocity and clothing combination can significantly influence the heating efficiency of a heated garment. In order to make good use of the thermal energy, the heating power should be well adjusted according to the environmental conditions. The heated clothing sandwiched between underwear and jacket in a three-layer clothing ensemble is one of the most effective ways to enhance the heating efficiency. In addition, the heated clothing alters the thermal evenness of clothing ensemble due to the heat release. This gives further evidence that the serial calculation method of clothing thermal resistance does not work for heterogeneous clothing ensembles. (Less)
Please use this url to cite or link to this publication:
author
supervisor
organization
publishing date
type
Thesis
publication status
published
subject
keywords
electrically heated vest (EHV), heating efficiency, cold weather clothing, air velocity, clothing combination, thermal resistance, air temperature
pages
69 pages
publisher
Tryckeriet i E-huset, Lunds universitet
external identifiers
  • other:LUTMDN/TMAT-2030-SE
ISBN
978-91-7473-016-6
language
English
LU publication?
yes
id
65d5b87c-fba0-4aa4-a263-4a383fb487af (old id 1635999)
date added to LUP
2010-09-09 12:50:11
date last changed
2018-05-29 10:11:27
@misc{65d5b87c-fba0-4aa4-a263-4a383fb487af,
  abstract     = {Cold weather garments are necessary for people who are exposed to cold environments (below -5 °C). The weight and bulkiness of such a cold weather clothing ensemble may limit human activity and reduce the productivity. In order to solve these problems, a slim garment with a built-in heating element could be useful. The heat input power and heating efficiency are the two most important parameters for a piece of heated clothing. The input power determines how much heat can be released from the whole clothing system, while the heating efficiency demonstrates how many percent of the thermal energy could effectively contribute to wearers. However, previous studies have mainly focused on heat input power and there is a lack of knowledge about the heating efficiency of the heated clothing.<br/><br>
 In this thesis, performances of electrically heated garments were compared and evaluated on two thermal manikins. The factors that affect on the clothing heating efficiency were thoroughly studied. It was found that the ambient temperature (or temperature gradient), air velocity and clothing combination can significantly influence the heating efficiency of a heated garment. In order to make good use of the thermal energy, the heating power should be well adjusted according to the environmental conditions. The heated clothing sandwiched between underwear and jacket in a three-layer clothing ensemble is one of the most effective ways to enhance the heating efficiency. In addition, the heated clothing alters the thermal evenness of clothing ensemble due to the heat release. This gives further evidence that the serial calculation method of clothing thermal resistance does not work for heterogeneous clothing ensembles.},
  author       = {Wang, Faming},
  isbn         = {978-91-7473-016-6},
  keyword      = {electrically heated vest (EHV),heating efficiency,cold weather clothing,air velocity,clothing combination,thermal resistance,air temperature},
  language     = {eng},
  note         = {Licentiate Thesis},
  pages        = {69},
  publisher    = {Tryckeriet i E-huset, Lunds universitet},
  title        = {Evaluation of the Performances of Electrically Heated Clothing},
  year         = {2010},
}