Overview
EN ISO 9488:2022 - Solar energy · Vocabulary (ISO 9488:2022) is an international CEN-endorsed vocabulary that defines basic and standardized terms used in the measurement of solar radiation and the utilisation of solar energy for space and water heating, cooling, industrial process heating and air conditioning. Prepared by ISO/TC 180 in collaboration with CEN/TC 312, this second edition updates and expands the terminology to reflect developments since the 1999 edition. The document focuses on clear definitions used across solar radiation measurement, solar thermal systems and related components.
Key topics
EN ISO 9488:2022 organizes terminology into concise, technical groups:
- Solar geometry: solar declination, solar azimuth, solar zenith/altitude, solar hour and solar time, solar noon.
- Radiation quantities: radiation, radiant energy, radiant flux, radiance, irradiance and related units.
- Radiation measurement: terms used for instruments, measurement procedures and calibration concepts.
- Radiation properties & processes: reflection, absorption, transmission and spectral considerations.
- Indoor / outdoor climates: climate and environment descriptors relevant to solar applications.
- Collector types & components: classification and vocabulary for solar collectors, absorbers, glazing and tracking systems (equatorial/altazimuth trackers).
- System types & components: terms for solar heating systems, system components and ancillary equipment.
- Non-solar-specific terms: common engineering vocabulary used in solar standards.
Note: while the vocabulary contains definitions useful for photovoltaic (PV) and high‑temperature solar thermal technologies, it is primarily focused on measurement and utilisation in heating/cooling and refers users to other documents for PV- and high-temperature-specific terminology.
Practical applications
EN ISO 9488:2022 is a reference tool that improves clarity and consistency across documentation, testing, design and regulation:
- Standardizes terminology in technical specifications, test reports and product datasheets for solar radiation measurement, solar collectors and solar thermal systems.
- Supports manufacturers, test laboratories and certification bodies in producing unambiguous documentation and compliance evidence.
- Helps engineers and system designers communicate exact meanings for parameters such as irradiance, angle of incidence and tracker definitions during system modelling and performance assessments.
- Useful for researchers, educators and policy-makers establishing guidelines, procurement documents or building energy regulations that reference solar energy measurements.
Who should use it
- Solar thermal system designers and engineers
- Test laboratories and instrument manufacturers (irradiance sensors, radiometers)
- Standards writers, certification and conformity assessment bodies
- Architects, building services and HVAC professionals
- Researchers and educators in solar energy and climatology
Related standards
EN ISO 9488:2022 complements other ISO, IEC and sector standards covering detailed measurement methods, PV technology vocabularies, high‑temperature solar thermal systems and collector testing protocols. Users working on PV or high‑temperature concentrator systems should consult those domain-specific standards for more detailed terminology.