Overview
ISO/TR 52018-2:2017 is an informative technical report that explains and justifies the indicator choices listed in ISO 52018‑1 for partial Energy Performance of Buildings (EPB) requirements related to thermal energy balance and fabric features. It is non‑normative: the document provides background, rationale and practical guidance to help regulators, authorities and industry stakeholders make informed decisions when selecting EPB indicators and implementing partial requirements for building thermal performance.
Key topics
The report expands on the topics enumerated in ISO 52018‑1 and provides rationale, points of attention and examples for:
- Thermal comfort (summer and winter) - motivations, indicators and exceptions
- Energy need for heating and cooling - indicator choices and comparable economic strictness
- Combination of energy needs and integration methods
- Overall thermal insulation of the thermal envelope and individual element U‑values
- Thermal bridges - requirement setting and alternative approaches
- Window energy performance - glazing and frame considerations
- Airtightness - measurement guidance and indicator selection
- Solar control and its interaction with comfort and energy needs
- Guidance on new construction vs. renovation, exceptions and comparable economic strictness assessments
Informative annexes include template input/method selection data sheets, default choices, regional references, example methods (e.g., fictitious cooling integration), and illustrative examples underpinning indicator expressions.
Applications
ISO/TR 52018‑2:2017 is practical for:
- Regulators and policymakers designing partial EPB requirements and reporting choices in a uniform manner
- Energy consultants and designers seeking context for selecting thermal‑performance indicators in compliance assessments
- Building certifiers and auditors who need interpretative guidance on indicators like heating/cooling needs, airtightness and window performance
- Researchers and manufacturers looking for documented rationale behind EPB indicator options
Practical uses include informing national/regional implementation of EPB standards, comparing economic strictness of requirements, choosing appropriate indicators for renovation vs new construction, and supporting consistent reporting formats described in ISO 52018‑1.
Related standards
- ISO 52018‑1 (enumerates possible partial EPB requirements and tables for regulator choices) - read in conjunction with ISO/TR 52018‑2
- ISO 52000‑1 (overarching EPB framework)
- CEN/TS 16628 and CEN/TS 16629 (EPB drafting principles and technical rules)
ISO/TR 52018‑2:2017 is a companion document that enhances understanding and supports consistent implementation of EPB indicators in the broader set of energy performance of buildings standards.
Open preview (PDF)Energy performance of buildings — Indicators for partial EPB requirements related to thermal energy balance and fabric features — Part 2: Explanation and justification of ISO 52018-1