Corpus ID: 110960986

Heat Stress Evaluation of Protective Clothing Ensembles

  title={Heat Stress Evaluation of Protective Clothing Ensembles},
  author={A. Pease},
Clothing directly affects the level of heat stress exposure. Useful measures to express the thermal characteristics are WBGT (wet bulb globe temperature) clothing adjustment factor (CAF) or apparent total evaporative resistance (Re,T,a). The CAF is assigned through laboratory wear trials following a heat stress protocol in which the air temperature and humidity are progressively increased until the participant clearly loses the ability to maintain thermal equilibrium. The critical condition is… Expand
2 Citations

Tables from this paper

Design considerations for low-level risk personal protective clothing: a review
This review systematically reviewed the literature on PPC and heat stress, focusing on research relating to working conditions of high temperature and humidity, and provides a foundation and directions for further research in low-level risk PPC. Expand
Factors affecting horticultural and cleaning workers' preference on cooling vests
Abstract Outdoor workers are at high risk of suffering from heat-related illness when they are exposed to a hot and humid environment under prolonged working time. Providing suitable cooling vestsExpand


Thermal characteristics of clothing ensembles for use in heat stress analysis.
The Heat Stress Index was an early model for the assessment of heat stress and the thermal characteristics of a variety of commercially available and prototype protective clothing ensembles have been determined for application in the ISO method. Expand
Simultaneous derivation of clothing-specific heat exchange coefficients.
A procedure is described that allows for the simultaneous determination of both total insulation (IT) and resistance to water vapor permeation (Re) on exercising clothed subjects without the need to directly measure skin water vapor pressure or continuously weigh the subjects. Expand
WBGT Clothing Adjustments for Four Clothing Ensembles Under Three Relative Humidity Levels
Threshold limit values for heat stress and strain are based on an upper limit wet bulb globe temperature (WBGT) for ordinary work clothes, with clothing adjustment factors (CAF) for other clothingExpand
Apparent evaporative resistance at critical conditions for five clothing ensembles
This wear test method improves on past methods using the progressive protocol to determine evaporative resistance by including the effects of movement, air motion and wetness on the estimate of clothing insulation. Expand
Heat balance when wearing protective clothing
This issue of the Annals of Occupational Hygiene is dedicated to the topic of heat stress evaluation. For this evaluation, several evaluation programs and international standards are available. InExpand
Continuing the search for WBGT clothing adjustment factors.
Assignment of an adjustment factor to an ensemble begins with establishing critical environmental conditions in which test subjects were just able to maintain thermal equilibrium, and results suggested adjustment factors with reference to ordinary work clothes from the least stress at 5.5 degrees C-WBGT. Expand
Heat balance when wearing protective clothing.
  • G. Havenith
  • Medicine
  • The Annals of occupational hygiene
  • 1999
An overview of the relevant heat exchange processes is provided, and the relevant parameters (air and radiant temperature, humidity, wind speed, metabolic heat production and clothing insulation), and the relation between clothing material properties and properties of clothing ensembles made from those materials are presented. Expand
Physiologically derived critical evaporative coefficients for protective clothing ensembles.
A physiological approach has been used to derive effective evaporative coefficients (he) which define this ability to evaporate sweat, and critical pressure was defined as the partial pressure of water vapor at which thermal balance could no longer be maintained and rectal temperature rose sharply. Expand
WBGT Clothing Adjustment Factors for Four Clothing Ensembles and the Effects of Metabolic Demands
A three-way mixed effects linear model with ensemble by metabolic rate category interactions demonstrated that the CAF did not change with metabolic rate, so CAFs can be used over a wide range of metabolic rates. Expand
Benefit of heat acclimation is limited by the evaporative potential when wearing chemical protective clothing.
The evaporative potential (EP), a measure of thermal insulation modified by moisture permeability, of the clothing ensemble offers a quantitative index useful to determine, a priori, whether heat acclimation would be helpful when wearing protective clothing system. Expand