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