Overview
ISO 9288:2022 - "Thermal insulation - Heat transfer by radiation - Vocabulary" is an ISO vocabulary standard that defines the physical quantities and terms used when describing radiative heat transfer in thermal insulation. The second edition (2022) updates and replaces ISO 9288:1989 and is intended to be used alongside related thermal-insulation vocabularies (for example ISO 7345, ISO 9229, ISO 9251 and ISO 9346). ISO 9288:2022 provides consistent definitions for concepts such as thermal radiation, radiance, irradiance, emissivity, black body, and distinctions between opaque and semi‑transparent media.
Key topics and technical content
- Clear definitions of general radiative terms: thermal radiation, heat transfer by radiation, total/spectral radiation, directional and hemispherical radiation.
- Surface-related vocabulary: radiant flux (heat flow rate), intensity, radiance, exitance/irradiance and their spectral and directional forms.
- Emission concepts: black body (Planck/Stefan–Boltzmann relations are referenced), black‑body exitance, and emissivity classifications - directional, hemispherical, spectral, grey body, isotropic and combined cases.
- Terms for receiving surfaces and semi‑transparent media, including bulk phenomena (absorption, scattering, emission) and combined conduction–radiation heat transfer descriptions.
- Structure: the standard organizes vocabulary into general terms, terms for emitting surfaces, receiving surfaces (opaque and semi‑transparent), and combined conduction/radiation contexts.
- Formal scope and editorial notes: this edition removed duplicate units and added clarifications (e.g., mean definitions), and contains no normative references.
Practical applications
- Ensures consistent terminology in technical documents, test reports, and product datasheets for thermal insulation, building-envelope design, HVAC, and industrial insulation.
- Supports accurate specification and interpretation of radiative properties in thermal modelling, simulation (radiative transfer), and energy performance assessments.
- Guides test laboratories and manufacturers when reporting spectral emissivity/reflectivity, radiance, irradiance and related measurement results.
- Useful for researchers, educators and standards developers to harmonize communication across international projects.
Who uses this standard
- Thermal engineers and modelers, building-performance consultants, test laboratories, insulation and fenestration manufacturers, researchers in heat transfer, and standards committees involved in thermal performance and energy use.
Related standards
- ISO 7345, ISO 9229, ISO 9251, ISO 9346 (referenced in the introduction) - other vocabularies and methods relevant to thermal insulation and heat transfer by radiation.
Keywords: ISO 9288:2022, thermal insulation vocabulary, heat transfer by radiation, radiance, irradiance, emissivity, black body, spectral radiance, semi‑transparent medium.
