NEN EN ISO 7933 : 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Symbols
4 Principles of the method of evaluation
5 Main steps of the calculation
  5.1 General heat balance equation
  5.2 Calculation of the required evaporative heat flow,
      the required skin wettedness and the required sweat
      rate
6 Interpretation of required sweat rate
  6.1 Basis of the method of interpretation
  6.2 Analysis of the work situation
  6.3 Determination of maximum allowable exposure time
      (D[lim])
  6.4 Organization of work in the heat
Annex A (normative) Data necessary for the computation of
        thermal balance
Annex B (informative) Criteria for estimating acceptable
        exposure time in a hot work environment
Annex C (informative) Metabolic rate
Annex D (informative) Clothing thermal characteristics
Annex E (informative) Computer programme for the computation
        of the Predicted Heat Strain Model
Annex F (normative) Examples of the Predicted Heat Strain
        Model computations
Bibliography

Provides a method for the analytical evaluation and interpretation of the thermal stress experienced by a subject in a hot environment. Describes a method for predicting the sweat rate and the internal core temperature that the human body will develop in response to the working conditions.