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ISO 7933:2023 Ergonomics of the thermal environment - Analytical determination and interpretation of heat stress using calculation of the predicted heat strain, 2023
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Principles of the predicted heat strain (PHS) model
- 6 Main steps of the calculation [Go to Page]
- 6.1 Heat balance equation [Go to Page]
- 6.1.1 General
- 6.1.2 Metabolic rate, M
- 6.1.3 Effective mechanical power, W
- 6.1.4 Heat flow by respiratory convection, Cres
- 6.1.5 Heat flow by respiratory evaporation, Eres
- 6.1.6 Heat flow by conduction, K
- 6.1.7 Heat flow by convection, C
- 6.1.8 Heat flow by radiation, R
- 6.1.9 Heat flow by evaporation, E
- 6.1.10 Heat storage for increase of core temperature associated with the metabolic rate, Qeqi
- 6.1.11 Heat storage, S
- 6.2 Calculation of the required evaporative heat flow, the required skin wettedness and the required sweat rate
- 7 Interpretation of required sweat rate [Go to Page]
- 7.1 Basis of the method of interpretation [Go to Page]
- 7.1.1 General
- 7.1.2 Stress criteria
- 7.1.3 Strain criteria
- 7.1.4 Reference values
- 7.2 Analysis of the work situation
- 7.3 Determination of allowable exposure time, Dlim
- 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 program for the computation of the predicted heat strain model
- Annex F (informative) Examples of the predicted heat strain model computations
- Bibliography [Go to Page]
