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NBN EN 12515 : 1997
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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HOT ENVIRONMENTS - ANALYTICAL DETERMINATION AND INTERPRETATION OF THERMAL STRESS USING CALCULATION OF REQUIRED SWEAT RATE
01-09-2004
12-01-2013
Foreword
0 Introduction
1 Scope
2 Normative references
3 Principles of the method of evaluation
4 Main steps of the calculation
4.1 General heat balance equation
4.1.1 Metabolic power (M, in watts per
square metre)
4.1.2 Effective mechanical power (W, in watts
per square metre)
4.1.3 Heat flow by respiratory convection
(Cres in watts per square metre)
4.1.4 Heat flow by respiratory evaporation
(Eres' in watts per square metre)
4.1.5 Heat flow by conduction (K, in watts per
square metre)
4.1.6 Heat flow by convection at the skin
surface (C, in watts per square metre)
4.1.7 Heat flow by radiation at the surface of
the skin (R, in watts per square metre)
4.1.8 Heat flow by evaporation at the skin
(E, in watts per square metre)
4.1.9 Heat storage (S, in watts per square metre)
4.2 Calculation of the required evaporation rate, the
required skin wettedness and the required sweat
rate
5 Interpretation of required sweat rate
5.1 Basis of the method of interpretation
5.2 Analysis of the work situation
5.3 Determination of allowable exposure time (DLE, min)
5.4 Organization of work in the heat
Annex A (informative) Data necessary for the calculation
of thermal balance
Annex B (informative) Estimation of thermal insulation of
clothing ensembles
Annex C (informative) Criteria for thermal stress and limit
values for thermal constraint
Annex D (informative) Computer program allowing the
calculation of the required sweat rate and of the allowable
exposure time in any thermal environment
Annex E (informative) A-Deviation: National deviation due
to regulations, the alteration of which is for the time
being outside the competence of the CEN/CENELEC member
Annex ZA (normative) Normative references to international
publications with their relevant European publications
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