ISO 6946:2017
Building components and building elements — Thermal resistance and thermal transmittance — Calculation methods
ISO 6946:2017 provides the method of calculation of the thermal resistance and thermal transmittance of building components and building elements, excluding doors, windows and other glazed units, curtain walling, components which involve heat transfer to the ground, and components through which air is designed to permeate.
The calculation method is based on the appropriate design thermal conductivities or design thermal resistances of the materials and products for the application concerned.
The method applies to components and elements consisting of thermally homogeneous layers (which can include air layers).
ISO 6946:2017 also provides an approximate method that can be used for elements containing inhomogeneous layers, including the effect of metal fasteners, by means of a correction term given in Annex F. Other cases where insulation is bridged by metal are outside the scope of ISO 6946:2017.
NOTE Table 1 in the Introduction shows the relative position of ISO 6946:2017 within the set of EPB standards in the context of the modular structure as set out in ISO 52000‑1.
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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 Description of the method
5.1 Output
5.2 General description
5.3 Detailed calculation method
5.4 Simplified calculation method
6 Calculation of thermal transmittance and thermal resistance
6.1 Output data
6.2 Calculation time intervals
6.3 Input data
6.4 Principles of the simplified calculation procedure
6.5 Thermal transmittance
6.5.1 By detailed calculation method
6.5.2 By simplified calculation method
6.6 Thermal resistance
6.7 Total thermal resistance
6.7.1 Thermal resistance of homogeneous components
6.7.2 Total thermal resistance of a building component consisting of homogeneous and inhomogeneous layers
6.8 Surface resistances
6.9 Thermal resistance of air layers
6.9.1 Applicability
6.9.2 Unventilated air layer
6.9.3 Slightly ventilated air layer
6.9.4 Well-ventilated air layer
6.10 Thermal resistance of unheated spaces
6.10.1 General
6.10.2 Roof spaces
6.10.3 Other spaces
Annex A (normative) Input and method selection data sheet — Template
Annex B (informative) Input and method selection data sheet — Default choices
Annex C (normative) Surface resistances
Annex D (normative) Thermal resistance of airspaces
Annex E (normative) Calculation of the thermal transmittance of components with tapered layers
Annex F (normative) Correction to thermal transmittance
Bibliography
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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 Description of the method
5.1 Output
5.2 General description
5.3 Detailed calculation method
5.4 Simplified calculation method
6 Calculation of thermal transmittance and thermal resistance
6.1 Output data
6.2 Calculation time intervals
6.3 Input data
6.4 Principles of the simplified calculation procedure
6.5 Thermal transmittance
6.5.1 By detailed calculation method
6.5.2 By simplified calculation method
6.6 Thermal resistance
6.7 Total thermal resistance
6.7.1 Thermal resistance of homogeneous components
6.7.2 Total thermal resistance of a building component consisting of homogeneous and inhomogeneous layers
6.8 Surface resistances
6.9 Thermal resistance of air layers
6.9.1 Applicability
6.9.2 Unventilated air layer
6.9.3 Slightly ventilated air layer
6.9.4 Well-ventilated air layer
6.10 Thermal resistance of unheated spaces
6.10.1 General
6.10.2 Roof spaces
6.10.3 Other spaces
Annex A (normative) Input and method selection data sheet — Template
Annex B (informative) Input and method selection data sheet — Default choices
Annex C (normative) Surface resistances
Annex D (normative) Thermal resistance of airspaces
Annex E (normative) Calculation of the thermal transmittance of components with tapered layers
Annex F (normative) Correction to thermal transmittance
Bibliography