DIN EN 13947:2007-03

1 Scope
2 Normative references
3 Terms and definitions, symbols and units
  3.1 Terms and definitions
  3.2 Symbols and units
  3.3 Subscripts
  3.4 Superscripts
4 Geometrical character
  4.1 Main principles
  4.2 Developed areas and internal depth
  4.3 Boundaries of curtain wall structures
      4.3.1 General
      4.3.2 Boundaries of a representative reference
            element
      4.3.3 Curtain wall areas
5 Cut-off planes and partitioning of thermal zones
  5.1 Rules for thermal modelling
  5.2 Cut-off planes of the geometrical model
6 Calculation of curtain wall transmittance
  6.1 Methodologies
  6.2 Single assessment method
      6.2.1 Thermal transmittance of glazing units
            and panels (filling elements)
      6.2.2 Determination of the heat flow through filling
            element/mullion or transom/filling element
            connection
      6.2.3 Determination of the overall thermal transmittance
            of a curtain wall (U[cw])
  6.3 Component assessment method
      6.3.1 General
      6.3.2 Definition of areas
      6.3.3 Thermal transmittance of glazing units and panels
            (filling elements)
      6.3.4 Thermal transmittance of frames, mullions and
            transoms
      6.3.5 Linear thermal transmittance
  6.4 Thermal transmittance of a curtain wall built of different
      elements
7 Input data
8 Report
  8.1 Section drawings
  8.2 Overview drawing of the whole curtain wall element
  8.3 Values used for calculation
  8.4 Presentation of results
Annex A (informative) - Guidance for calculating the thermal
        transmittance U[cw] of curtain walling using the
        two methods
Annex B (informative) - Linear thermal transmittance of
        junctions
Annex C (normative) - A method for calculating the thermal
        effect of screws using a 2D numerical method and the
        procedures specified in EN ISO 10077-2
  C.1 General
  C.2 Calculation of the equivalent thermal conductivity of
      the screw [lambda][s,eq]
  C.3 Consideration of screw heads and washers
Annex D (normative) - Ventilated and unventilated air spaces
        Unventilated air layer
Annex E (informative) - Component method: Calculation example
  E.1 Data for examples
  E.2 Frames
      E.2.1 Definition and evaluation of areas
      E.2.2 Evaluation of U[f] values
  E.3 Glazing units
      E.3.1 Definition and evaluation of areas
      E.3.2 Evaluation of U[g] values
      E.3.3 Definition of l[g] and evaluation
            of [psi][g], [psi][m,f] and [psi][t,f]
  E.4 Panels
      E.4.1 Definition and evaluation of areas
      E.4.2 Evaluation of U[p] values
      E.4.3 Definition of l[p] and evaluation of
            the [psi][p] values
      E.4.4 Calculation of a complete element
Annex F (informative) - Single assessment method:
        Calculation example
  F.1 General description of examples
  F.2 Centre U-value of the glazing unit
  F.3 Centre U-value of the spandrel panel
  F.4 U-values of thermal joints
  F.5 Overall U-value of the curtain wall

Specifies a method for calculating the thermal transmittance of curtain walls consisting of glazed and/or opaque panels fitted in, or connected to, frames.