Overview
ISO 52022-1:2017 - Energy performance of buildings - Thermal, solar and daylight properties of building components and elements - Part 1 - defines a simplified calculation method to estimate the combined solar and daylight performance of solar protection devices (SPDs) combined with glazing. The standard produces the key outputs used in building energy assessments: total solar energy transmittance (g-value), total solar direct transmittance, and total light transmittance for systems such as louvre, venetian and roller blinds positioned interior, exterior or between panes.
Key topics and technical requirements
- Scope and applicability
- Applicable when glazing total solar energy transmittance is between 0.15 and 0.85.
- SPD optical ranges: transmittance τ between 0 and 0.5 and reflectance ρ between 0.1 and 0.8; outside these ranges see ISO 52022-3.
- Assumes normal incidence of radiation; angular dependence and spectral distribution are not accounted for.
- Method is valid for inclined elements and multiple SPD positions (interior, exterior, between panes).
- Assumptions
- Venetian/louvre blinds are assumed adjusted to prevent direct solar penetration.
- For external and integrated SPDs the gap to glazing is treated as unventilated; for internal SPDs it is ventilated.
- Results are approximate: typical deviation from exact values lies between +0.10 and −0.02, generally conservative for cooling load estimations.
- Method structure
- Defines required input data for glazing and SPDs, calculation time intervals, the calculation procedure, and reporting formats and drawings.
- Produces output data for use in energy performance assessments and HVAC sizing.
Practical applications
- Use ISO 52022-1:2017 for:
- Rapid estimation of combined glazing + shading performance in building energy models.
- Early-stage design decisions on solar protection strategy to reduce cooling loads.
- Regulatory or compliance assessments where a simplified, standardized approach is required.
- Not intended for precise evaluation of beneficial solar gains or detailed thermal comfort criteria - for higher fidelity optical/spectral modeling use ISO 52022-3.
Who should use this standard
- Architects, façade engineers, energy modelers, HVAC designers, and regulators involved in building energy performance (EPB) assessments who need a standardized, fast method to quantify solar and daylight characteristics of glazing with shading devices.
Related standards
Keywords: ISO 52022-1:2017, energy performance of buildings, solar protection devices, glazing, total solar energy transmittance, g-value, light transmittance, simplified calculation method.