GB/T 42483-2023Determination of thermal conductivity of wood—Heat flow method (English PDF)
木材导热系数的测定 热流法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 17, 2023
Implementation date
March 17, 2023
Scope
GB/T 42483-2023 is the English-translated version of 木材导热系数的测定 热流法.
This document describes the determination of the thermal conductivity of wood by the heat flow method, giving the test equipment, the specimen, the test procedure, the calculation of the result and the content of the test report.
The document applies to the determination of the radial, tangential and longitudinal thermal conductivity of wood.
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Document preview — GB/T 42483-2023
National Standard of the People's Republic of China
- ICS
- 79.040
- Classification
- B 68
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Principle
- 5 test equipment
- 5.1 Schematic diagram of test equipment
- 5.2 Heating system and cooling system
- 5.3 Heat flow meter board
- 5.4 Specimen clamping system
- 6 Sample
- 6.1 Sawing
- 6.2 Quantity
- 6.3 Dimensions and flatness
- 6.4 Moisture content
- 7 Test Step
- 7.1 Measurement of sample size and mass before testing
- 7.2 Sample installation
- 7.3 Adjusting the balance
- 7.4 Measurement of thermal conductivity
- 7.5 Determination of sample size, mass, moisture content and density after testing
- 8 Result calculation
- 8.1 General Computing
- 8.2 Specific calculations
- 9 Test report
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.
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.
Note: The unit of heat flow is watts (W). [Source: GB/T 4132-2015, 2.8.2]
3.2 Heat flux density
The heat flow per unit area (3.1) perpendicular to the heat direction is shown in formula (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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1927.2-2021Test methods for physical and mechanical properties of small clear wood specimens - Part 2: Sampling methods and general requirements
- GB/T 1927.4-2021Test methods for physical and mechanical properties of small clear wood specimens - Part 4: Determination of moisture content
- GB/T 1927.5-2021Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density
- GB/T 4132Thermal insulation - Vocabulary
- LY/T 1788Vocabulary of wood properties
Similar standards
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Related Standards
GB/T 1927.2-2021 — Test methods for physical and mechanical properties of small clear wood specimens - Part 2: Sampling methods and general requirements
GB/T 1927.4-2021 — Test methods for physical and mechanical properties of small clear wood specimens - Part 4: Determination of moisture content
GB/T 1927.5-2021 — Test methods for physical and mechanical properties of small clear wood specimens - Part 5: Determination of density
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