ISO 52022-1:2017

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

• ISO 52022 series (detailed methods): ISO 52022-3 (detailed optical/spectral calculations)
• Overarching EPB framework: ISO 52000-1
• Supporting normative references cited: ISO 7345, ISO 9050

Keywords: ISO 52022-1:2017, energy performance of buildings, solar protection devices, glazing, total solar energy transmittance, g-value, light transmittance, simplified calculation method.