ISO/TR 52000-2:2017

Overview

ISO/TR 52000-2:2017 is a Technical Report supporting the overarching EPB (Energy Performance of Buildings) assessment framework defined in ISO 52000‑1. Published by ISO in 2017, this report provides explanation, justification and background for the procedures and methodological choices in ISO 52000‑1. It is intended to aid correct understanding, national implementation and practical use of the EPB assessment set of standards by supplying validation results, worked examples and detailed guidance.

Key topics and technical scope

ISO/TR 52000-2:2017 expands and clarifies the overarching EPB assessment approach without replacing the normative content of ISO 52000‑1. Major technical topics covered include:

• Overarching framework and modular structure: explanation of the systematic, modular approach for step-by-step implementation of EPB standards.
• Terms, definitions, symbols and units: clear definitions and notation to ensure consistent interpretation across national implementations.
• Preparation and classification: guidance on identifying building types, space categories, assessment types and building services included in EPB.
• Calculated energy performance: explanation of input data categories (product data, system design, operating conditions, constants) and the calculation procedure.
• Measured energy performance and verification: measurement intervals, measurement procedures, and methods for comparing measured vs. calculated energy performance.
• Overall assessment rules: normalization to building size, assessment boundaries, weighting (primary energy, greenhouse gas factors, export handling) and calculation of renewable energy share.
• Zoning and thermal zones: rules for defining thermal zones, spaces and service areas within the EPB framework.
• Validation and examples: reporting of validation of calculation procedures and detailed example cases to support national standard writers and users.

Practical applications and who should use it

ISO/TR 52000-2 is aimed at stakeholders involved in building energy assessment and regulation:

• National standards bodies implementing ISO 52000‑1 in local regulation or building codes.
• Energy assessors and auditors who perform EPB calculations and need guidance on inputs, measurement and reporting.
• Building designers and engineers using EPB methodology for design-stage energy evaluation.
• Policy makers and regulators seeking justification of methodological choices and validation evidence.
• Software developers building compliant calculation tools for building energy performance.

By providing clarification, examples and validation, the report improves consistency in energy performance of buildings assessments and supports reliable national implementation of the ISO EPB framework.

Related standards

• ISO 52000‑1 - Overarching EPB assessment (normative reference; ISO/TR 52000‑2 explains and justifies this standard)
• Other standards in the ISO EPB series (refer to ISO 52000‑1 for the modular numbering and cross-references)

Keywords: ISO/TR 52000-2:2017, energy performance of buildings, EPB assessment, ISO 52000-1, calculation procedures, measured energy performance, primary energy, zoning, building services.