Overview
EN ISO 24194:2022/A1:2024 is Amendment 1 to ISO 24194:2022, published by CEN in March 2024. It updates the international standard ISO 24194 - Solar energy - Collector fields - Check of performance. The amendment does not change the overall scope of the parent standard but introduces clarifications and technical corrections to symbols, units and formula notation used throughout the document. National implementation in CEN member countries was required by September 2024.
Key topics
- Symbol and notation updates: Systematic replacement and indexing of several symbols (for example, alpha, temperature and other parameters) across clauses, examples and annexes to improve clarity and consistency.
- Formula refinements: Corrections to formula references and variables in key clauses (sections 5 and 6) and worked examples for performance estimation.
- Unit correction: Correction of heat-transfer related unit notation (e.g., thermal conductivity/heat loss coefficient unit expressed correctly as W/(m·K)).
- Illustration/figure edits: Updates to figure labels related to irradiance and shading (e.g., shadowing on fixed collectors in rows).
- Annex adjustments: Aligned symbol usage and formulae in Annex A and Annex B to reflect editorial and technical corrections.
- Standards governance notes: Confirms adoption under CEN rules and draws attention to possible patent rights and national implementation obligations.
Applications
Who uses EN ISO 24194:2022/A1:2024 and why:
- Solar thermal system designers and engineers - to ensure consistent computation and verification of collector-field performance.
- Test laboratories and certification bodies - for repeatable, standardized checks of collector field output and to interpret performance equations correctly.
- Project developers and asset owners - to validate expected thermal yields and support commissioning or performance acceptance testing.
- Researchers and academics - for consistent notation when comparing or publishing field-performance studies.
- Standards committees and regulators - to harmonize national regulations and procurement specifications referencing ISO 24194.
Practical uses include performance checks for non-concentrating and low-focusing collectors, evaluating shading impacts, and setting up equations for field performance estimates.
Related standards
- ISO 24194:2022 (base standard) - Collector fields: check of performance.
- Developed by ISO/TC 180 (Solar energy) in collaboration with CEN/TC 312 (Thermal solar systems and components).
Keywords: EN ISO 24194:2022/A1:2024, ISO 24194 amendment 2024, solar energy standard, collector fields, check of performance, solar collector testing, solar thermal performance.