GB/T 39704-2020Determination of effective thermal conductivity for vacuum insulation panels(VIP) (English PDF)

1 Scope

This standard specifies the method for measuring the effective thermal conductivity of vacuum insulation panels:

This standard applies to vacuum insulation panels:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 4132 Thermal insulation materials and related terms

GB/T 10294 Determination of steady-state thermal resistance and related characteristics of thermal insulation materials: Protective hot plate method

GB/T 10295 Determination of steady-state thermal resistance and related characteristics of thermal insulation materials by calorimeter method

GB/T 13475-2008 Determination of adiabatic steady-state heat transfer properties, calibration and protective hot box method

GB/T 22588 flash method to measure thermal diffusivity or thermal conductivity

GB/T 37608 vacuum insulation board

3 Terms and definitions

The following terms and definitions defined in GB/T 4132 and GB/T 37608 apply to this document:

3:1

Effective thermal conductivity effectivethermalconductivity

The apparent thermal conductivity of the entire vacuum insulation panel considering the influence of the edge of the gas barrier film:

4 Principle

This standard provides three methods for measuring the effective thermal conductivity of vacuum insulation panels: Method A adopts GB/T 10294 protective hot plate method

Principle, by eliminating the influence of heat transfer in the non-metering area, the effective thermal conductivity of the vacuum insulation board with the same size as the metering area is tested;

Method B adopts the principle of GB/T 13475-2008 hot box method, by measuring the heat transfer coefficient of the test piece, and then converting it into the effective vacuum insulation panel

Thermal resistance value and effective thermal conductivity; Method C is related by first measuring the thermal conductivity of the central area of the vacuum insulation board, and then combining it with the gas barrier film

Information, calculate the effective thermal resistance and effective thermal conductivity of the vacuum insulation panel:

5 Method A

5:1 Instruments

5:1:1 Thermal conductivity tester

Use a thermal conductivity tester that meets the following requirements for testing:

a) Meet the requirements of GB/T 10294;