GB/T 41743-2022Rapid testing and evaluation method of thermal insulation performance and attenuation for vacuum insulating glass—Unsteady state method (English PDF)

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 of Standardization Documents" drafted.

Introduction

The issuing body of this document draws attention to the fact that declarations of compliance with this document may refer to Chapters 4, 5, 6, 7 and appendices The contents of A and Appendix B are the same as "Method and Device for Unsteady Detection of Thermal Insulation Performance of Vacuum Glass" and "A Method for Rapidly Measuring Thermal Resistance of Vacuum Glass" Use of Laws and Devices.

The issuing authority of this document has no position on the authenticity, validity and scope of the patent.

The patent holder has undertaken to the issuing body of this document that he is willing to agree with any applicant, on reasonable and non-discriminatory terms and conditions, to Negotiate patent licensing. This patent holder's statement is on file with the issuing agency of this document.

2) Name of the patent holder. Xinliji Energy-saving Glass (Tianjin) Co., Ltd.

Please note that in addition to the patents mentioned above, some content of this document may still involve patents. The issuing agency of this document does not undertake to identify the patent responsibility.

1 Scope

This document specifies the method, principle, apparatus, test, numerical method for evaluating the thermal insulation performance of vacuum glass and its attenuation by the unsteady state method. According to the processing and test report.

This document is suitable for manufacturers to quickly test and evaluate the thermal insulation performance of vacuum glass and its attenuation in the research process.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated reference documents, only The version corresponding to this date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 8484-2020 Test method for thermal insulation performance of exterior doors and windows of buildings

GB/T 38586-2020 Vacuum glass

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Principles of the method

Based on the transient response, the temperature of one side (hot end) of the vacuum glass rapidly rises in steps, while the other side (measurement end) is accurately measured with a smaller temperature.

With a slow temperature rise, the unsteady heat transfer characteristics of vacuum glass can be obtained (the temperature change rate at the characteristic time of this temperature rise process is positively related to the heat transfer coefficient).

The temperature change rate detection will be affected by the ambient temperature and temperature difference.

The intelligent model with heat transfer coefficient as the input variable and heat transfer coefficient as the output variable can realize the rapid detection and evaluation of the thermal insulation performance of vacuum glass.

Regularly check the insulation performance of vacuum glass, the time when the heat transfer coefficient remains unchanged is the retention time of the insulation performance, and the time from the beginning to decay The time to reach the classification threshold is the decay time of insulation performance, which can be fitted by a degenerate power-law model to evaluate the decay trend of insulation performance.

5 Instruments