NEN EN ISO 13791 : 2012

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
  3.1 Terms and definitions
  3.2 Symbols and units
  3.3 Subscripts
4 Determination of internal temperatures
  4.1 Assumptions
  4.2 Evaluation of the relevant temperatures
  4.3 Room thermal balance
  4.4 Boundary conditions
  4.5 Terms in the thermal balance equations
5 Procedure for carrying out calculations
  5.1 General
  5.2 Design climatic data
  5.3 Geometrical and thermophysical characteristics
      of room elements
  5.4 Design internal gains
  5.5 Design occupant behaviour
  5.6 Calculation procedure
6 Report of the calculation
7 Validation procedures
  7.1 Introduction
  7.2 Validation of heat transfer processes
  7.3 Validation procedure for the whole calculation method
Annex A (informative) Example of solution technique
      A.1 Introduction
      A.2 Basic assumptions for the calculation method
      A.3 Calculation procedure
      A.4 Room thermal balance
Annex B (informative) Convective heat transfer through
        ventilated air layer
      B.1 Introduction
      B.2 Convective heat transfer for a vertical air layer
      B.3 Convective heat transfer for an external horizontal
          air layer
Annex C (informative) Shading due to overhangs and side fins
      C.1 Introduction
      C.2 Calculation path for overhang
      C.3 Calculation path for vertical projection at the
          end of the overhang
      C.4 Calculation path for side fin
      C.5 Calculation of the sunlit area due to short side
          fin
      C.6 External obstruction
      C.7 Sunlit factor
Annex D (informative) Design climatic data in the warm season
Annex E (informative) Calculation of the internal long-wave
        radiation exchanges in buildings
      E.1 Introduction
      E.2 Limits of application
      E.3 Calculation procedure
Annex F (informative) External radiative long-wave heat
        transfer coefficients
      F.1 Introduction
      F.2 Terms and calculation procedure
Annex G (informative) Solar factors
      G.1 Introduction
      G.2 Solar to air factor
      G.3 Distribution factors
      G.4 Solar loss factor
Annex H (informative) Internal gains
      H.1 Introduction
      H.2 Residential building
      H.3 Non residential building
Annex J (informative) Air ventilation
      J.1 Introduction
      J.2 Calculation procedure
      J.3 Example of calculation of natural ventilation
          rates for simple building
Annex K (informative) Detailed results of the validation
        tests considered in the 'whole validation model'
        procedure
Bibliography

Defines the assumptions, boundary conditions, equations and validation tests for a calculation procedure, under transient hourly conditions, of the internal temperatures (air and operative) during warm periods, of a single room without any cooling/heating equipment in operation.