Modelling of Heat and Moisture Loss Through NBC Ensembles

Abstract

This report summarizes work done to model the heat and moisture transport through various NBC clothing ensembles. The analysis involves simplifying the three dimensional physical problem of clothing on a person to that of a one dimensional problem of flow through parallel layers of clothing and air. Body temperatures are calculated based on prescribed work rates, ambient conditions and clothing properties. Sweat response and respiration rates are estimated based on empirical data to provide appropriate boundary conditions at the skin. Core and skin temperatures are calculated during the analysis and reported as functions of time for four different clothing ensembles. Evaporative heat loss was found to be the dominant heat loss mechanism. Estimates of the rate of sweat evaporation through the clothing ensembles is made. The predicted temperature responses, although not exact, are comparable to results from physiological experiments but somewhat lower. Work tolerance times were predicted to be longer than that found experimentally.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1991
Accession Number
ADA245939

Entities

People

  • Brad Cain
  • Randall Osczevski

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Abstracts
  • Air Temperature
  • Body Temperature
  • Classification
  • Clothing
  • Energy
  • Environment
  • Failure Mode And Effect Analysis
  • Heat Loss
  • Heat Transfer
  • Numerical Analysis
  • Respiration
  • Security
  • Solar Radiation
  • Specific Heat
  • Thermal Resistance
  • Three Dimensional

Readers

  • Computational Modeling and Simulation
  • Exercise and Sports Science.
  • Fluid Dynamics.