GB/T 39704-2020 in English

VALID

Determination of effective thermal conductivity for vacuum insulation panels (VIP)

Issued on:2020-12-14
Implemented on:2021-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	GB/T 39704-2020
Document status:	VALID
Title in English:	Determination of effective thermal conductivity for vacuum insulation panels (VIP)
Title in Chinese:	真空绝热板有效导热系数的测定
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-12-14
Implemented on:	2021-11-01
ICS Classification:	91.100.60-Thermal and sound insulating materials
Chinese Classification:	Q25-Heat insulation, sound absorption, light fireproof material
Professional Classification:	GB-National Standard
Related Keywords:	effective thermal conductivity thermal conductivity effective thermal resistance measured central thermal conductivity vacuum insulation panels
Related Topics:	insulation heat conduction efficient Thermal Conductivity of Thermally Conductive Plastics Thermal Conductivity index of vacuum machine Test thermal conductivity iso iso thermal conductivity vacuum thermal analysis hot plate vacuum efficiency Thermal conductivity of tellurium Thermal conductivity of carbon thermal coefficient Hot wire method thermal conductivity meter Hot wire method thermal conductivity meter The effective carbon number of naphthalene Affecting the vacuum Equipment for measuring thermal conductivity Test Thermal Vacuum Thermal Vacuum Apparatus absolute vacuum definition Effective number of posts Application of thermal conductivity vacuum sample Measuring Thermal Diffusivity or Thermal Conductivity by Flash Method Measuring thermal conductivity vacuum heating roller Vacuum heating roller vacuum heating roller Thermal conductivity analysis Thermal conductivity analysis Vacuum Insulation Box Efficient heating plate thermal vacuum analysis Efficient heating plate Thermal Analysis in Vacuum Thermal Conductivity and Thermal Conductivity Carbon thermal conductivity Definition of absolute vacuum thermal vacuum analysis Parameters of the hot plate Thermal+ Efficient hot plate Vacuum way Use of thermal conductivity meter information vacuum Coefficient English Several kinds of vacuum How to analyze thermal conductivity Thermal conductivity of copper GBT39704 GB/T 39704-2020 liquid thermal conductivity Calibration method of thermal conductivity of reference plate How to calibrate thermal conductivity How to calibrate thermal conductivity coefficient Heat pipe test thermal conductivity Insulation material thermal conductivity tester vacuum Semiconductor vacuum heating Calibration of thermal conductivity standard plate Determination of thermal conductivity using flat plate method

《GB/T 39704-2020真空绝热板有效导热系数的测定》由TC191（全国绝热材料标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Introduction

Analysis of the core content of the standard

GB/T 39704-2020 stipulates three methods for determining the effective thermal conductivity of vacuum insulation panels (VIP):

Method	Principle basis	Applicable scenarios	Accuracy requirements
Method A (Guarded Hot Plate Method)	GB/T 10294	Laboratory Precision Measurement	±3%
Method B (Hot Box Method)	GB/T 13475	Large Size Sample Testing	±5%
Method C (calculation method)	Central area measurement + edge correction	Mass production quality control	±7%

Key Technical Points

1. Specimen Preparation Specifications

For the Guarded Hot Plate Method:

The side length of the square specimen must strictly match the size of the measuring plate
Diagonal deviation ≤2mm, warpage ≤3mm
When non-vacuum protection is required, a polyurethane filling material with a thermal conductivity of ≤0.025 W/(m·K) must be used

2. Test Environment Control

All methods require:

Temperature (23±2)℃
Relative humidity (50±5)%
State adjustment ≥72 hours

Standard implementation recommendations

Application case: Cold chain logistics VIP selection

A cold chain enterprise adopted method C to test 300mm×300mm double-sided aluminum film VIP (thickness 20mm):

The measured central thermal conductivity was 0.004 W/(m·K)
According to Table A.2, the effective thermal resistance was 4.56 (m²·K)/W
Converted to an effective thermal conductivity of 0.0044 W/(m·K)

Technology evolution analysis

The standard was first introducedLinear heat transfer coefficient concept (Equation 6), quantifying the edge thermal bridge effect through six process parameters (N₁-N₆), with an accuracy improvement of 30% compared to the 2010 version of the standard.

More samples: GB 50021-2001(2009) DL/T 368-2010 JGJ 94-2008

Sample only — not a preview of GB/T 39704-2020

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