ISO 52016-3:2023

Overview

ISO 52016-3:2023 defines calculation procedures for assessing the energy needs for heating and cooling, internal temperatures, and sensible and latent heat loads for buildings that include adaptive building envelope elements. Built on the hourly calculation methodology of ISO 52016-1, this part provides additions and modifications where glazing or façade components are dynamic or actively controlled. It applies to building design, new construction and existing buildings in use, and supports energy performance certification, comparison and conformity checks.

Key topics and requirements

• Scope of adaptive elements: covers three types - dynamic solar shading, chromogenic glazing, and actively ventilated cavities. Environmentally activated control approaches are defined for chromogenic glazing and can be applied to other element types.
• Calculation basis: uses the hourly calculation methodology in ISO 52016-1; ISO 52016-3 takes precedence where procedures conflict.
• Model options: defines simplified and detailed models for adaptive building envelope elements with specific input data sets and property definitions.
• Control modelling: prescribes methods to model both environmentally activated and actively controlled scenarios, including selection of sensors, events/conditions, control strategies and user behaviour modelling.
• Inputs and outputs: specifies required climatic, physical and control-related input data; outputs include energy needs for heating/cooling, internal temperatures, sensible/latent loads and performance indicators relative to a reference element.
• Quality and conformity: includes provisions for quality control and conformance checks. Annexes provide templates (Annex A), default choices (Annex B) and reference control scenarios (Annex C).
• Limits: not applicable to geometrically complex adaptive elements that require multi-zone coupling.

Applications and users

• Primary users: architects, building-energy engineers, regulators and certification bodies conducting Energy Performance of Buildings (EPB) assessments.
• Secondary users: manufacturers and suppliers of adaptive façade components, building owners and consultants evaluating retrofit options.
• Practical uses:
  • Calculating and comparing building energy needs for compliance, energy performance labels and certificates.
  • Quantifying the contribution of adaptive envelope elements to smart readiness and operational energy savings.
  • Informing design optimization, product specification (dynamic shading, chromogenic glass, ventilated cavities) and cost-benefit analysis for retrofits.

Related standards

• ISO 52016-1 (hourly calculation methodology) - foundational calculation approach referenced throughout.
• ISO/TR 52016-4 - background and justification for selecting adaptive building envelope elements.
• Other EPB module standards referenced via the EPB modular framework for integrated energy performance assessment.

Keywords: ISO 52016-3:2023, adaptive building envelope, dynamic solar shading, chromogenic glazing, actively ventilated cavity, energy performance of buildings, energy needs for heating and cooling, ISO 52016-1, hourly calculation methodology, EPB.