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Standards Development
This European Standard specifies methods of determining the luminous and solar characteristics of glazing in buildings. These characteristics can serve as a basis for lighting, heating and cooling calculations of rooms and permit comparison between different types of glazing. This European Standard applies both to conventional glazing and to absorbing or reflecting solar-control glazing, used as vertical or horizontal glazed apertures. The appropriate formulae for single, double and triple glazing are given. A matrix method is provided as an alternative calculation method.
This European Standard introduces a method to determine the luminous and solar properties of Building-Integrated Photovoltaic (BIPV) glazing.
This European Standard is accordingly applicable to all transparent materials except those which show significant transmission in the wavelength region 5 μm to 50 μm of ambient temperature radiation, such as certain plastic materials.
Materials with light-scattering properties for incident radiation are dealt with as conventional transparent materials subject to certain conditions (see 5.2).
Angular light and solar properties of glass in building are excluded from this standard. However, research work in this area is summarised in Bibliography [1], [2] and [3].
Guidance on the measurement of luminous and spectral properties of glass can be found in the Bibliography [4].
Vacuum Insulating Glass (VIG) is excluded from the scope of this document. For determination of the g value of VIG, please refer to ISO 19916-1.
The purposes of this revision are to introduce the following modifications:
a) Changes to the calculation of the internal heat transfer coefficient for consistency with the future EN 673: 2024;
b) Clarification provided that UV transmittance is determined only for the total range and not split into UVA and UVB;
c) Modification to normalized relative spectral distribution of global solar radiation based on 10 nm wavelength intervals;
d) Ambiguity relating to the area-weighting procedure for screen printed glass has been clarified;
e) Introduction of a matrix method for non-scattering incoherent optical systems, including multiple layers;
f) Modifications to the formulae to permit calculation and declaration of the luminous and solar properties of BIPV glazing.
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