Overview
ISO 10077-2:2017/Amd 1:2024 is an important amendment to the international standard focused on the thermal performance of windows, doors, and shutters. This document specifically addresses the calculation of thermal transmittance using a numerical method for frames. As an amendment to Part 2 of ISO 10077-2, it provides updated procedural guidance and revised figures essential for accurately assessing the energy efficiency and thermal insulation properties of framing components in fenestration products.
Authorized by the International Organization for Standardization (ISO), this standard supports architects, engineers, manufacturers, and energy consultants in evaluating heat transfer through building envelope elements. It is a key reference for enhancing energy performance in buildings and supporting compliance with energy efficiency regulations worldwide.
Key Topics
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Numerical calculation methods: The amendment refines the numerical techniques used to calculate thermal transmittance (U values) of window, door, and shutter frames, essential for precise thermal performance evaluation.
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Updated illustrations and tables: Revised figures, tables, and keys provide clearer examples of frame profiles, insulation panels, and thermal resistance boundaries, improving interpretability and accuracy in modeling.
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Surface resistance definitions: Updated data for internal and external surface resistances clarify the thermal boundary conditions critical for numerical simulations and standardized calculations.
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Material emissivity details: Specific emissivity values for different surface materials such as aluminium, PVC, wood, and insulation panels are provided, ensuring that heat radiation effects are consistently accounted for in calculations.
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Comprehensive profile section schematics: Amendments include detailed cross-section diagrams of multiple frame types (e.g., sliding window frames, roof window frames, roller shutter boxes) to support a wide range of practical applications.
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Framework for consistency: The document emphasizes congruence with other Energy Performance of Buildings (EPB) standards, limiting interpretation ambiguity by explicitly outlining required input data and methods.
Applications
ISO 10077-2:2017/Amd 1:2024 is widely applicable in:
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Building energy performance assessments: Facilitates reliable calculation of heat flow through framing elements, key to minimizing energy loss and improving building envelope insulation.
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Fenestration product development: Guides manufacturers in designing and testing thermally efficient window, door, and shutter frames to meet market and regulatory demands.
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Regulatory compliance and certification: Supports conformity with frameworks like the EU Energy Performance of Buildings Directive (EPBD) and other national standards requiring accurate U-value reporting.
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Sustainability and green construction: Enhances decision-making related to material selection and thermal design, contributing to sustainable construction goals and carbon footprint reduction.
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Thermal modeling software integration: Provides standardized input parameters and calculation algorithms for simulation tools used by engineers and consultants in building design.
Related Standards
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ISO 10077-1: Thermal performance of windows, doors, and shutters – Calculation of thermal transmittance – Part 1: General definitions and calculation methods.
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ISO 10077 series: A comprehensive collection of standards addressing various aspects of thermal performance and calculation methods for building components.
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CEN/TC 89 Standards: European standards related to thermal performance of buildings and building components, developed in coordination with ISO under the Vienna Agreement.
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ISO 13789: Thermal performance of buildings - Transmission and ventilation heat transfer coefficients - Calculation method, which complements window and frame performance calculations.
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ISO/IEC Directives: Framework documents describing standard development procedures ensuring harmonization and consistent editorial rules.
By adopting the updated numerical methods and specifications in ISO 10077-2:2017/Amd 1:2024, industry professionals can enhance the thermal design and energy efficiency of windows, doors, and shutters, leading to more sustainable and comfortable built environments.
Open preview (PDF)Thermal performance of windows, doors and shutters — Calculation of thermal transmittance — Part 2: Numerical method for frames — Amendment 1