Overview
ISO/TR 52022-2:2017 is an informative technical report supporting the correct understanding and application of several EPB (energy performance of buildings) standards related to glazing, frames and solar protection. It does not contain normative requirements; instead it provides explanation, justification, worked examples and background for ISO 10077‑1, ISO 10077‑2, ISO 12631, ISO 52022‑1 and ISO 52022‑3. The report helps users interpret methods for calculating thermal transmittance, solar transmittance and daylight transmittance for windows, doors, curtain walls and solar protection devices combined with glazing.
Key topics and technical content
- Purpose and scope: Clarifies the role of the accompanied standards in the EPB suite and explains why separate technical reports are needed to keep normative standards concise.
- Main outputs: Thermal transmittance of windows, doors, curtain walls, shutter boxes and frames; solar and daylight characteristics for solar protection devices combined with glazing.
- Method descriptions:
- Overview of simplified and detailed calculation approaches for solar and daylight characteristics (ISO 52022‑1 and ISO 52022‑3).
- Summary of thermal transmittance calculation methods for windows and frames (ISO 10077‑1 and ISO 10077‑2) and curtain walling (ISO 12631).
- Explanation of the 2‑D numerical method used for frame profiles and linear thermal transmittance (ISO 10077‑2).
- Supporting material: Multiple informative annexes with calculation examples, typical glazing and solar protection data, equivalent optical characteristics for louvres/venetian blinds, and worked examples for component and single assessment methods.
- Tools and implementation notes: Notes on accompanying spreadsheets (available at www.epb.center) and which standards can or cannot be implemented in spreadsheets (ISO 10077‑2 and ISO 52022‑3 cannot).
Practical applications
- Use ISO/TR 52022‑2 to:
- Interpret and apply EPB calculation standards when assessing building façades and fenestration.
- Support regulatory compliance and national implementation of EPB standards by providing justification and examples.
- Aid development of calculation tools and verification procedures for thermal and solar performance.
- Typical outputs inform energy performance modeling, building code compliance, product certification and façade design decisions.
Who should use this report
- Building energy assessors and consultants
- Façade and window manufacturers
- Architects and façade engineers
- Certification bodies and test laboratories
- Regulators and code authors implementing EPB standards
Related standards
ISO/TR 52022‑2:2017 is a practical companion document for anyone working on the energy performance of glazing, frames and solar protection - providing context, worked examples and clarifications to ensure consistent application of the EPB calculation standards.
