GB/T 20311-2021 English PDF

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GB/T 20311-2021: Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods
Status: Valid

GB/T 20311: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20311-2021	624	Add to Cart	6 days	Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods	Valid
GB/T 20311-2006	RFQ	ASK	4 days	Building components and building elements -- Thermal resistance and thermal transmittance -- Calculation method	Obsolete

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Basic data

Standard ID: GB/T 20311-2021 (GB/T20311-2021)
Description (Translated English): Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q25
Word Count Estimation: 34,354
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 20311-2021: Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods ICS 91.120.10 CCSQ25 National Standards of People's Republic of China Replace GB/T 20311-2006 Thermal resistance and heat transfer coefficient of building components and building units Calculation method (ISO 6946.2017, IDT) Released on 2021-08-20 2022-03-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 20311-2006 "Calculation Method for Thermal Resistance and Heat Transfer Coefficient of Building Components and Building Units", and Compared with GB/T 20311-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added the term "EPB Standard" and its definition (see 3.6); ---Modified the table of symbols and units (see Chapter 4, 3.2 of the.2006 edition); ---The calculation method has increased the detailed algorithm (see Chapter 5, 6.5.1); ---Add input values, output results, constants and other tables (see Chapter 6); ---Modified the principle of the simplified algorithm (see Chapter 6.4, Chapter 4 of the.2006 edition); ---Adjusted the order of the simplified algorithm chapters (see Chapter 6, Chapter 5, Chapter 6, and Chapter 7 of the.2006 edition); ---Added a normative appendix "input and method selection tabulation" (see Appendix A); ---Added an informative appendix "input and method selection reference" (see appendix B); ---Modified part of the calculation content of surface thermal resistance and adjusted it to a normative appendix (see Appendix C, Appendix A of the.2006 edition); ---Modified the calculation content of the thermal resistance part of the air space and adjusted it to the normative appendix (see Appendix D, Appendix B of the.2006 edition, Appendix F); ---Modified the calculation of the thermal resistance of components with wedge-shaped layers and adjusted it to a normative appendix (see Appendix E, Appendix C of the.2006 edition); --- Modified part of the content of the heat transfer coefficient correction, and adjusted to a normative appendix (see Appendix F, Appendix D of the.2006 edition). This document uses the translation method equivalent to ISO 6946.2017 ``Calculation of thermal resistance and heat transfer coefficient of building components and building units method". This document was proposed by the China Building Materials Federation. This document is under the jurisdiction of the National Thermal Insulation Material Standardization Technical Committee (SAC/TC191). Drafting organizations of this document. Nanjing Fiberglass Research and Design Institute Co., Ltd., Anhui Hongchang New Materials Co., Ltd., Henan Chengjian Inspection Inspection Technology Co., Ltd., Suzhou Huaxia Design and Construction Co., Ltd., Zhejiang Yicheng Inspection Co., Ltd., China Construction Xinjiang Construction Engineering (Group) Limited company, the national glass fiber product quality supervision and inspection center. The main drafters of this document. Qu Huili, Wu Jiafu, Zhang Shuaikai, Hong Liang, Guan Pinwu, Yang Fen, Wang Yashan, Jia Jinhong, Li Tao, Liu Yadan, Cui Jun, Yan Huifeng, Kou Pengfei, Chen Lixuan, Zhang Wen. This document was first published in.2006, and this is the first revision.

Introduction

The series of international standards for building energy efficiency assessment is also known as the "EPB series of standards." EPB series standards follow the same rules to ensure Consistency, continuity and openness among the standards in the series. ISO 6946.2017 is one of the EPB series of international standards. The standardization goal is to achieve building energy efficiency through building energy efficiency assessment Rating, the position in the series of standards is shown in Table 1.The main target audiences of the standards are architects, engineers and regulatory agencies. Table 1 The position of ISO 6946.2017 (M2-5) in the module structure of the EPB standard group General Building System Technology Sub-module description description description heating, cooling, ventilation, humidification, dehumidification, hot water lighting Building from Dynamic and control Photovoltaic Wind energy Subject M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11

1 General General General Purpose

Common terms and Definition; symbol, Unit and subscript Building energy need Demand a

3 Application

No system Indoor conditions Maximum load And power

4 Energy expression method

Energy expression Way Energy expression Way Building category and boundary Heat transfer coefficient ISO Launch and control

6 Convective heat transfer under operating conditions

Distribution and control Energy services and Energy carrier polymerization Heat Conduction Storage and control

8 Increased solar heat in building zones

Generate and control

9 Energy efficiency calculation heat mass

Load scheduling and Operating condition 10 Energy efficiency test Energy efficiency test Energy efficiency test 11 Inspection inspection inspection Indoor comfort Express BMS 13 External environmental conditions 14 Economic calculation a The shaded module is not selectable. For more information, please refer to the technical report (ISO /T R52019-2). In addition to ISO 6946.2017, ISO /TC163/SC2 is responsible for the standards belonging to the EPB series. ---The calculation procedure for the overall energy consumption and energy efficiency of the building; ---The calculation procedure of the indoor temperature of the building (e.g., assuming there is no internal heating or cooling); ---Part of EPB energy balance and structural characteristics index requirements; ---Energy efficiency of some special buildings and special building components or units (such as floors, opaque packaging units, windows, facades, etc.), Calculation methods for heat, damp heat, solar energy, and visual performance. This document is equivalent to ISO 6946.2017, which provides the heat transfer coefficient and thermal resistance of building components and building units such as roofs and walls. Calculation method. ---Provide a unified method for the comparison between different structures; --- Provide a standardized basis for determining whether building components and building units comply with laws and regulations; ---Provide data support for calculating the energy required for heating or cooling buildings. Thermal resistance and heat transfer coefficient of building components and building units Calculation method

1 Scope

This document gives the calculation method of thermal resistance and heat transfer coefficient of building components and building units, but does not include doors, windows, and other glass 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 materials and products related to the application. This document applies to building components and units composed of a thermally homogeneous layer (which may include an air layer). Appendix F of this document gives the approximate calculation method for the non-thermal homogeneous layer of metal fasteners, but it does not apply to metal thermal bridges. The insulation layer. Note. According to the modular setting specified in ISO 52000-1, Table 1 in the introduction gives the relative position of this document in the EPB series of standards.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. ISO 7345 Insulation material physical quantity and definition (Thermalperformanceofbuildingsandbuildingcompo- nents-Physicalquantitiesanddefinitions) ISO 10211 Detailed algorithm for thermal bridge heat flow and surface temperature in building structures (Thermalbridgesinbuildingcon- struction-Heatflowsandsurfacetemperatures-Detailedcalculation) ISO 10456 Construction materials and products heat and humidity performance claim value, design value selection procedure and design value tabulation (Buildingmaterialsandproducts-Hygrothermalproperties-Tabulateddesignvaluesandprocedures fordeterminingdeclaredanddesignvalues) ISO 13789 The calculation method of heat transfer coefficient and ventilation coefficient of building insulation performance (Thermalperformanceof buildings-Transmissionandventilationheattransfercoefficients-Calculationmethod) ISO 52000-1.2017 EPB Evaluation System for Building Energy Efficiency Part 1.General Framework and Procedures (Energyperformanceof buildings-OverarchingEPBassessment-Part 1.Generalframeworkandprocedures) Note 1.Except for ISO 52000-1, the default EPB reference file is determined by the EPB module code and is given in Appendix A (Table A.1) and Appendix B (Table B.1). Example. EPB module code. M5-5 or M5-5, 1 (if M5-5 is subdivided), or M5-5/1 (if specific chapters in document M5-5 are cited). Note 2.This document does not quote other EPB document clauses. The above statements and notes are to maintain the consistency of the EPB series of documents.

3 Terms and definitions

The following terms and definitions defined by ISO 7345 and ISO 52000-1 apply to this document. 3.1 Buildingelement The main part of the building. Example. wall, floor or roof. ......

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