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BS EN ISO 10077-2:2017+A1:2025 Thermal performance of windows, doors and shutters. Calculation of thermal transmittance - Numerical method for frames >
BS EN ISO 10077-2:2017+A1:2025 Thermal performance of windows, doors and shutters. Calculation of thermal transmittance - Numerical method for frames, 2025
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- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and subscripts
- 4.1 Symbols
- 4.2 Subscripts
- 5 Calculation method
- 5.1 Output of the method
- 5.2 General principle
- 5.3 Validation of the calculation programs
- 6 Calculation of thermal transmittance
- 6.1 Output data
- 6.2 Calculation time intervals
- 6.3 Input data
- 6.3.1 Geometrical characteristics
- 6.3.2 Thermal conductivity values
- 6.3.3 Emissivity of surfaces
- 6.3.4 General boundaries
- 6.3.5 Boundaries for roller shutter boxes
- 6.4 Calculation procedures
- 6.4.1 Determination of thermal transmittance
- 6.4.2 Treatment of cavities using the radiosity method
- 6.4.3 Treatment of cavities using the single equivalent thermal conductivity method
- 7 Report
- 7.1 Contents of report
- 7.2 Geometrical data
- 7.3 Thermal data
- 7.3.1 Thermal conductivity
- 7.3.2 Emissivity
- 7.3.3 Boundary conditions
- 7.4 Presentation of results
- Annex A (normative) Input and method selection data sheet — Template
- Annex B (informative) Input and method selection data sheet — Default choices
- Annex C (normative) Regional references in line with ISO Global Relevance Policy
- Annex D (normative) Thermal conductivity and other characteristics of selected materials
- Annex E (normative) Surface resistances
- Annex F (normative) Determination of the thermal transmittance
- Annex G (normative) General examples for the validation of calculation programs using the radiosity method for the treatment of cavities
- Annex H (normative) Examples of window frames for the validation of calculation programs using the radiosity method for the treatment of cavities
- Annex I (normative) Examples of window frames for the validation of calculation programs using the single equivalent thermal conductivity method for the treatment of cavities
- Annex J (normative) Wood species listed in Annex D
- Bibliography [Go to Page]
