Effect of heat and moisture transfer properties of T-shirts on comfort sensations

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Effect of heat and moisture transfer properties of T-shirts on comfort sensations

 

Author: Kar, Fung-yi
Title: Effect of heat and moisture transfer properties of T-shirts on comfort sensations
Degree: M.Phil.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
T-shirts -- Physiological aspects.
Textile fabrics -- Physiological aspects.
Human comfort.
Department: Institute of Textiles and Clothing
Pages: xvii, 147, [143] leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2165750
URI: http://theses.lib.polyu.edu.hk/handle/200/1678
Abstract: The heat and moisture transfer properties of clothing are critical to thermal comfort as they affect the direct (viz. heat transfer by conduction, convection, radiation) and latent (viz. evaporative heat) heat loss from the human body. The objective measurement of the heat and moisture transfer properties of clothing and the understanding on how they affect thermal comfort sensations are therefore important to apparel product development. The present study is focused on the objective measurement of the heat and moisture transfer properties of T-shirt fabrics and garments and the investigation of the relationship between these objectively measured properties and the thermal comfort sensations of T-shirts in wear. In one part of this study, different types of laboratory tests for the moisture transport properties of fabrics and garments were compared. These tests include ASTM E96 Water Vapor Transmission Test, Moisture transmission Test (Model CS-141), Sweating Guarded Hot Plate Measurement, and the sweating fabric manikin-Walter. For the range of knitted T-shirt fabrics tested, it showed that results from the different tests are highly interrelated. The correlations established from this study make it possible to compare test results from different test methods. In another part of the study, the physiological responses (i.e. measured in terms of mean skin temperature and humidity) and thermal comfort sensations for human subjects wearing T-shirts made of 14 different types of fabrics and undergoing a protocol of running exercise were investigated. The study showed that, although the differences in terms of the physiological responses, between the wearers wearing different T-shirts, are not statistically significant probably due to the large variances in human subjects' physiological conditions and variances in wearer trials, there are significant differences between the thermal comfort votes for human subjects wearing different T-shirts. Human is more sensitive than the temperature and humidity measurements because of unobvious differences between the T-shirt fabric samples. Based on the Principle Component Analysis and Multiple Regression Analysis, the study further showed that thickness and thermal properties were important predictors of the thermal comfort sensations of wearers during and after the exercise, whereas moisture transport properties of fabrics are not important factors to thermal comfort at the initial period of the exercise, but become more important after the initial period. Towards the end of the exercise and after the exercise, when the wearers sweated, liquid water absorbency and wicking properties become significant predictors of thermal comfort sensation. In addition, it was found that, at the beginning of the exercise, overall thermal comfort sensation is mainly related to the warmth sensation and towards the end of the exercise and after the exercise, the overall thermal comfort sensation is increasingly related to skin wetness sensation.

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