Overview
EN ISO 52022-3:2017 (ISO 52022-3:2017) defines a detailed calculation method for determining the solar and daylight optical characteristics of solar protection devices combined with glazing. The standard uses spectral transmittance and reflectance data of constituent materials to compute metrics such as total solar energy transmittance and total light transmittance for façade systems where shading devices (e.g., blinds, louvres) are integrated with glazing. When spectral data are not available, the method can be adapted to use integrated optical data.
Key topics and technical requirements
- Spectral-based calculation method: Uses wavelength-dependent transmittance and reflectance of glass and solar protection materials to obtain physically consistent results.
- Primary outputs: Total solar energy transmittance (g-value), total visible light transmittance (visible transmittance), and other solar-optical characteristics of the combined system.
- Input data: Solid layer properties, gas-space characteristics, spectral optical data (or integrated alternatives).
- Calculation scope: Time-interval based computations for solar radiation and daylight, heat transfer, energy balance and boundary conditions to reflect dynamic performance.
- Reporting: Specifies required contents for calculation reports and presentation of results.
- Normative annexes: Includes templates and normative methods for itemizing inputs, equivalent optical characteristics for louvres/venetian blinds (Annex D), stack effect, and gas physical properties.
Practical applications and users
EN ISO 52022-3:2017 is intended for professionals involved in building energy and daylighting analysis who require accurate optical characterisation of glazed façades with shading:
- Facade and glazing manufacturers - to produce certified product data (g-values, visible transmittance) for systems combining glazing and solar protection devices.
- Building energy modelers & simulation engineers - to include accurate solar gains and daylight metrics in thermal and HVAC load calculations.
- Architects and façade consultants - for early-stage design decisions on shading strategies, daylighting and glare control.
- Certification bodies and regulators - to support compliance with EPB standards and EU energy performance directives (EPBD).
- Researchers - for advanced studies of spectral effects, fenestration performance and dynamic shading behavior.
Related standards
- Part of the ISO 52022 series on energy performance of buildings and the set of EPB (Energy Performance of Buildings) standards.
- Supersedes EN 13363-2:2005 and supports requirements of EU Directive 2010/31/EU (EPBD) when used in regulatory contexts.
This standard is essential when precise, spectrally accurate calculations of solar heat gains and daylight through glazing with integrated shading are needed for energy performance, thermal comfort and compliance assessments.
