Building components and building elements. Thermal resistance and thermal transmittance. Calculation methods (ISO 6946:2017, Corrected version 2021-12)
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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.
Tämän julkaisun valmistelusta Suomessa vastaa Rakennustuoteteollisuus RTT ry, puh. 09 12 991 (vaihde).
Sisällysluettelo
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
6.6 Thermal resistance
6.7 Total thermal resistance
6.8 Surface resistances
6.9 Thermal resistance of air layers
6.10 Thermal resistance of unheated spaces
Annex A Input and method selection data sheet — Template (normative)
Annex B Input and method selection data sheet — Default choices (informative)
Annex C Surface resistances (normative)
Annex D Thermal resistance of airspaces (normative)
Annex E Calculation of the thermal transmittance of components with tapered layers (normative)
Annex F Correction to thermal transmittance (normative)
ISO 10211:2017 Thermal bridges in building construction -- Heat flows and surface temperatures -- Detailed calculations
ISO 10456:2007 Building materials and products -- Hygrothermal properties -- Tabulated design values and procedures for determining declared and design thermal values
ISO 13789:2017 Thermal performance of buildings -- Transmission and ventilation heat transfer coefficients -- Calculation method
ISO 10211:2017 Thermal bridges in building construction -- Heat flows and surface temperatures -- Detailed calculations
ISO 10456:2007 Building materials and products -- Hygrothermal properties -- Tabulated design values and procedures for determining declared and design thermal values
ISO 13789:2017 Thermal performance of buildings -- Transmission and ventilation heat transfer coefficients -- Calculation method
ISO 52000-1:2017 Energy performance of buildings -- Overarching EPB assessment -- Part 1: General framework and procedures
ISO 7345:1987 Thermal insulation -- Physical quantities and definitions