GB/T 42483-2023 English PDF

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GB/T 42483-2023: Determination of thermal conductivity of wood - Heat flow method
Status: Valid

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Basic data

Standard ID: GB/T 42483-2023 (GB/T42483-2023)
Description (Translated English): Determination of thermal conductivity of wood - Heat flow method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B68
Classification of International Standard: 79.040
Word Count Estimation: 10,134
Date of Issue: 2023-03-17
Date of Implementation: 2023-03-17
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42483-2023: Determination of thermal conductivity of wood - Heat flow method

---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.
ICS79:040 CCSB68 National Standards of People's Republic of China Determination of thermal conductivity of wood by heat flow method Released on 2023-03-17 2023-03-17 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 2 5 test equipment 2 5:1 Schematic diagram of test equipment 2 5:2 Heating system and cooling system 2 5:3 Heat flow meter board 2 5:4 Specimen clamping system 3 6 Sample 3 6:1 Sawing 3 6:2 Quantity 3 6:3 Dimensions and flatness 3 6:4 Moisture content3 7 Test Step 3 7:1 Measurement of sample size and mass before testing 3 7:2 Sample installation 3 7:3 Adjusting the balance 3 7:4 Measurement of thermal conductivity 4 7:5 Determination of sample size, mass, moisture content and density after testing 4 8 Result calculation 4 8:1 General Computing 4 8:2 Specific calculations 5 9 Test report 5

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 for Standardization Documents" drafting: Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the State Forestry and Grassland Administration: This document is under the jurisdiction of the National Timber Standardization Technical Committee (SAC/TC41): This document is drafted by: Institute of Wood Industry, Chinese Academy of Forestry Sciences, Jiangsu Senmao Bamboo and Wood Industry Co:, Ltd:, Jiangsu Brother Intelligence Home Furnishing Co:, Ltd:, Anji Jiuda Furniture Co:, Ltd:, Xiamen Green Biotechnology Co:, Ltd:, Zhejiang Yunfeng Moganshan Flooring Co:, Ltd:, Zunhua Kuowang Wood Industry Co:, Ltd:, Linyi City Inspection and Testing Center, Beijing Building Materials Inspection Co:, Ltd: The main drafters of this document: Zhao Youke, Li Xiaoling, Yu Huaqiang, An Xin, Xu Jinmei, Zhang Ran, Liu Hailiang, Liu Baihan, Xiao Qi, Chen Zhiyong, Gui Chengsheng, Ma Yingchao, Wu Lezhang, Feng Xiuyan, Chai Dong: Determination of thermal conductivity of wood by heat flow method

1 Scope

This document describes the test equipment, sample, test procedure, result calculation and test report for determining the thermal conductivity of wood by the heat flow method: This document is applicable to the determination of the radial, chord and longitudinal thermal conductivity of wood:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: GB/T 1927:2-2021 Test methods for physical and mechanical properties of wood with small unblemished specimens - Part 2: Sampling methods and general requirements GB/T 1927:4-2021 Test methods for physical and mechanical properties of small unblemished wood samples - Part 4: Determination of moisture content GB/T 1927:5-2021 Test methods for physical and mechanical properties of wood with small unblemished specimens - Part 5: Determination of density GB/T 4132 Thermal insulation materials and related terms LY/T 1788 Timber Properties Terminology

3 Terms and Definitions

GB/T 4132, LY/T 1788 and the following terms and definitions apply to this document: 3:1 heat flow rate When there is a temperature difference on both sides of an object with a certain area, the heat transferred through the object by heat conduction, convection, and radiation per unit time, such as Formula (1) shown: Φ=dQ/dt (1) Note: The unit of heat flow is watts (W): [Source: GB/T 4132-2015, 2:8:2] 3:2 The heat flow per unit area (3:1) perpendicular to the heat direction is shown in formula (2): q=dΦ/dA (2) Note: The unit of heat flux density is watts per square meter (W/m2): [Source: GB/T 4132-2015, 2:8:3] 3:3 thermal conductivity A physical indicator of the thermal conductivity of a material: Numerically equal to the heat flux (3:2) divided by the negative temperature gradient, as shown in formula (3): ......

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