GB/T 20311-2021 (English Version) PDF

Scope: This document gives calculation methods for the thermal resistance and heat transfer coefficient of building components and building units, but does not include doors, windows, other glazed components, curtain walls, components that transfer heat to the ground and components designed for ventilation. This calculation method is based on the appropriate design thermal conductivity or design thermal resistance of the materials and articles relevant to the application. This document applies to building elements and units consisting of a thermally homogeneous layer (which may contain an air layer). Approximate calculation methods for non-thermally homogeneous layer members containing metal fasteners are given in Appendix F of this document, but are not applicable to thermal insulation layers with metal thermal bridges. Note: According to the modular setting specified in ISO 52000 1, Table 1 in the introduction shows the relative position of this document in the EPB series of standards.

GB/T 20311-2021 Referenced Document

ISO 10211 Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations
ISO 10456 Building materials and products - Hygrothermal properties - Tabulated design values and procedures for determining declared and design thermal values; Technical Corrigendum 1
ISO 13789 Thermal performance of buildings - Transmission and ventilation heat transfer coefficients - Calculation method
ISO 7345 Thermal performance of buildings and building components — Physical quantities and definitions

2021 GB/T 20311-2021 Building components and building elements—Thermal resistance and thermal transmittance—Calculation methods
2006 GB/T 20311-2006 Building components and building elements .Thermal resistance and thermal transmittance.Calculation method