BS EN 13363-2:2005

Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
  3.1 Terms and definitions
  3.2 Symbols and units
4 Characteristic data
  4.1 Solid layers
  4.2 Gas spaces
5 Principles of calculation
  5.1 General
  5.2 Solar radiation and light
  5.3 Heat transfer
  5.4 Energy balance
6 Boundary conditions
  6.1 Reference and summer conditions
  6.2 Report
Annex A (normative) Determination of equivalent solar and
                    light optical characteristics for
                    louvres or venetian blind
  A.1 Assumptions
  A.2 Symbols
  A.3 Direct radiation
  A.4 Diffuse radiation
  A.5 Thermal radiation
  A.6 Global radiation
  A.7 Example
Annex B (normative) Stack effect
  B.1 General
  B.2 Pressure loss factors
Annex C (informative) Example
  C.1 Input data
  C.2 Results
Annex D (informative) Physical properties of gases
Bibliography

Defines a detailed method, based on the spectral transmission data of the materials, comprising the solar protection devices and the glazing, to determine the total solar energy transmittance and other relevant solar-optical data of the combination.

This document specifies a detailed method, based on the spectral transmission data of the materials, comprising the solar protection devices and the glazing, to determine the total solar energy transmittance and other relevant solar-optical data of the combination. If spectral data are not available the methodology can be adapted to use in-tegrated data. The method is valid for all types of solar protection devices parallel to the glazing such as louvres, or venetian, or roller blinds. The blind may be located internally, externally, or enclosed between the panes of the glazing. Ventilation of the blind is allowed for in each of these positions in determining the solar energy absorbed by the glazing or blind components, for vertical orientation of the glazing. The blind component materials may be transparent, translucent or opaque, combined with glazing components with known solar transmittance and reflectance and with known emissivity for thermal radiation. The method is based on a normal incidence of radiation and does not take into account an angular dependence of transmittance or reflectance of the materials. Diffuse irradiation or radiation diffused by solar protection devices is treated as if it were direct. Louvres or venetian blinds are treated as homogenous materials by equivalent solar optical characteristics, which may depend on the angle of the incidence radiation. For situations outside the scope of this document; ISO 15099 covers a wider range of situations. The document also gives certain normalised situations, additional assumptions and necessary boundary conditions.