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Title: Prediction of thermal insulation values of garments from the physical data of their fabrics

Abstract

A simplified heat transfer model was developed for the prediction of the insulation value of a single-layer garment which covers the body partially or totally. In the model, the body was subdivided into four cylindrical segments. These were the head, trunk, and upper and lower extremities. The radius and length of each segment were based on the distribution of volume and surface area of a standard man. In the model, it was assumed that the heat transfer, from the skin to the environment, takes place by radiation and conduction through a motionless air layer. Heat is then transferred through the fabric of the garment. To simplify the complex mechanism of heat transfer through the fabric, an apparent thermal conductivity was defined. Its value depends on the volume fraction of fiber and air spaces within the fabric. From the outside surface of the fabric, heat is dissipated by convection and radiation to the environment. An expression was developed for the prediction of the insulation values of garments. According to the model, the insulation value of a single-layer garment depends on the surface area ratios of the body segments covered by the garment; the area factor of the garment; the thickness ofmore » the air gap between the skin and the garment for each body segment; the thickness of the fabric; the bulk densities of the fabric and the fiber of the fabric; and the linear radiation coefficient of heat exchange between the skin and the inner surface of the garment and the insulation of the air layer adjacent to the covered or uncovered parts of the body. (The latter is a function of air velocity.) Comparisons were made between the model predictions and the experimental measurements of men's and women's garments. The agreement was fairly good.« less

Authors:
Publication Date:
Research Org.:
Kansas State Univ., Manhattan
OSTI Identifier:
7213533
Resource Type:
Conference
Journal Name:
ASHRAE Trans.; (United States)
Additional Journal Information:
Journal Volume: 82; Conference: Proceedings of the ASHRAE semiannual meeting, Dallas, TX, USA, 1 Feb 1976
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; CLOTHING; HEAT TRANSFER; TEXTILES; MATHEMATICAL MODELS; THERMAL INSULATION; ENERGY TRANSFER; 320102* - Energy Conservation, Consumption, & Utilization- Office Buildings- (-1987); 420400 - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Azer, N Z. Prediction of thermal insulation values of garments from the physical data of their fabrics. United States: N. p., 1976. Web.
Azer, N Z. Prediction of thermal insulation values of garments from the physical data of their fabrics. United States.
Azer, N Z. Thu . "Prediction of thermal insulation values of garments from the physical data of their fabrics". United States.
@article{osti_7213533,
title = {Prediction of thermal insulation values of garments from the physical data of their fabrics},
author = {Azer, N Z},
abstractNote = {A simplified heat transfer model was developed for the prediction of the insulation value of a single-layer garment which covers the body partially or totally. In the model, the body was subdivided into four cylindrical segments. These were the head, trunk, and upper and lower extremities. The radius and length of each segment were based on the distribution of volume and surface area of a standard man. In the model, it was assumed that the heat transfer, from the skin to the environment, takes place by radiation and conduction through a motionless air layer. Heat is then transferred through the fabric of the garment. To simplify the complex mechanism of heat transfer through the fabric, an apparent thermal conductivity was defined. Its value depends on the volume fraction of fiber and air spaces within the fabric. From the outside surface of the fabric, heat is dissipated by convection and radiation to the environment. An expression was developed for the prediction of the insulation values of garments. According to the model, the insulation value of a single-layer garment depends on the surface area ratios of the body segments covered by the garment; the area factor of the garment; the thickness of the air gap between the skin and the garment for each body segment; the thickness of the fabric; the bulk densities of the fabric and the fiber of the fabric; and the linear radiation coefficient of heat exchange between the skin and the inner surface of the garment and the insulation of the air layer adjacent to the covered or uncovered parts of the body. (The latter is a function of air velocity.) Comparisons were made between the model predictions and the experimental measurements of men's and women's garments. The agreement was fairly good.},
doi = {},
journal = {ASHRAE Trans.; (United States)},
number = ,
volume = 82,
place = {United States},
year = {1976},
month = {1}
}

Conference:
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