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Thomas E. Bernard
University of South Florida
College of Public Health
13201 Bruce B. Downs Blvd.
Tampa, FL 33612-3805
phone: 813-974-6629
fax: 813-974-4718
email: tbernard@health.usf.edu  ·  website: http://personal.health.usf.edu/tbernard

Qualitative | Semi-Quantitative | Quantitative

Occupational Heat Stress and Heat Strain

The following materials are intended to support and expand the application of ACGIH® TLV® for heat stress and strain. The materials are copyrighted.  It would be nice to hear from you by email if you download anything from this site.

The TLV® for heat stress and strain was described in a webinar offered by the ACGIH® in April of 2006. The worksheets used are provided below. Please see the ACGIH® website for information on obtaining a copy of the webinar.

Basic Tools(top of page)

Psychrometric Relationships

Can be used to determine other psychrometric properties from any two and can be used to estimate natural wet bulb temperature.

Analysis Package
v 1.0 (1/22/05)
Qualitative Tools(top of page)

Qualitative Exposure Assessment

Two methods are provided. One has been published and the other reflects some of my thoughts (unpublished).
Qual Exp Ass't
v 1.0 (8/19/01)

PrevHeat: Qualitative PHS Exposure Assessment

PrevHeat is an Excel-based qualitative exposure assessment method based on the ISO 7933 (2004) Predicted Heat Strain. Click on Prevheat under the desired language and follow the directions carefully.
Link to Prof. Jacques Malchaire
Semi-Quantitative(top of page)
WBGT Screening for Heat Stress

Manual Screen
v 2.2 (4/14/06)

Recovery Allowances

Charts that specify the percent of a cycle to allow for recovery.

Analysis Package
v 3.1 (4/1/06)
Quantitative(top of page)

WBGT

The basic time-weighted average method for exposure assessment. Analysis Package has routines to estimate WBGT.

Analysis Package
v 4.0 (4/1/06)



Manual Method
v 3.2 (4/14/06)

Rational Heat Stress Analysis Package

The Excel workbook is built on the Predicted Heat Strain model described in ISO 7933 (2004) and papers published by Prof. J. Malchaire. An additional feature is the inclusion of clothing adjustments based on ISO9920 (2007). Imperial (Traditional US) units are not supported.
Analysis Package
v 1.1 (3/25/09)

Short-Term Exposure Limit

An empirical relationship to recommend time limits for high heat stress exposures based on WBGT and allowing for metabolic rate and clothing.

This is currently under review in JOEH.


Analysis Package
v 1.0 (3/13/09)

Estimation of Exposure Time with Ice Cooling Personal Protection

An estimate of the amount of time a person can stay in a hot environment while wearing a personal cooling system with an ice heat sink.
Manual Method
v 1.0 (2/5/07)

Estimation of Metabolic Rate

Methods include ISO and Qualitative Descriptors plus equations for selected activities.

The newest versions (v3 for Analysis Package and v2 for Manual Method) have an expanded set of equations including an adaptation of Garg's equations to estimate metabolic rate.



Analysis Package
v 3.1 (7/28/05)


Manual Method
v 2.0 (8/6/06)


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This page was last updated on April 17, 2009