• Corpus ID: 110960986

Heat Stress Evaluation of Protective Clothing Ensembles

@inproceedings{Pease2010HeatSE,
  title={Heat Stress Evaluation of Protective Clothing Ensembles},
  author={A. Pease},
  year={2010}
}
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… 
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.

References

SHOWING 1-10 OF 37 REFERENCES

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.

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.

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.

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.

Heat balance when wearing protective clothing.

  • G. Havenith
  • Computer Science
    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.

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.

Continuing the search for WBGT clothing adjustment factors.

The original concept for the heat stress limits adopted by the American Conference of Governmental Industrial Hygienists (ACGIH R ) was that the threshold for heat stress can be marked by

Apparent latent heat of evaporation from clothing: attenuation and "heat pipe" effects.

It is demonstrated that the traditional way of calculating evaporative heat loss of a clothed person can lead to substantial errors, especially for clothing with low permeability, which can be positive or negative, depending on the climate and clothing type.

Clothing evaporative heat resistance--proposal for improved representation in standards and models.

An empirical description of the relation between the clothing permeability index (im) and the changes in clothing heat resistance due to wind and movement was selected as the most promising method for deriving clothing vapour resistance.