GB/T 39548-2020 in English
VALIDDetermination of retention rate on thermal resistance of vacuum insulation panels (VIP) in hygrothermal conditions
- Issued on:2020-12-14
- Implemented on:2021-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$88.00
《GB/T 39548-2020真空绝热板湿热条件下热阻保留率的测定》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
Interpretation of the core content of the standard
This standard specifies the method for determining the thermal resistance retention rate of vacuum insulation panels under four typical environmental conditions (high temperature and high humidity, alternating high and low temperatures, low temperature, and high temperature). By comparing the changes in thermal resistance values in the central area before and after treatment, the durability of the material in a hot and humid environment is scientifically evaluated.
Key technical elements
| Testing links | Technical parameters | Allowance deviation |
|---|---|---|
| State adjustment | Temperature 23℃/humidity 50% | ±2℃/±5% |
| Wet heat treatment | Temperature 70℃/humidity 90% | ±2℃/±3% |
| Thermal resistance test | Thermal conductivity tester | In accordance with GB/T 10294/10295 |
Detailed explanation of the test process
- Initial test: Use a thermal conductivity meter to measure the thermal resistance of the central area of the sample before treatment
- Environmental treatment: Select one of the four conditions specified in the standard for 28 days of accelerated aging
- Final test: Measure the thermal resistance again and calculate the retention rate (formula: η=R1/R0×100%)
Implementation suggestions
Actual application case: The exterior wall of a building uses a vacuum insulation panel insulation system. The test according to this standard shows that the thermal resistance retention rate under high temperature and high humidity conditions is 92%, which meets the requirements of JGJ 144 specification.
Notes: The test should be terminated when the sample leaks or deforms; it is recommended to add infrared thermal imaging auxiliary detection.
Background of Standard Evolution
With the development of ultra-low energy consumption buildings, the performance degradation of traditional insulation materials in hot and humid environments has become prominent. This standard fills the gap in the durability evaluation method of vacuum insulation panels and forms a supporting standard system with GB/T 37608.
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