Abstract Vacuum insulation panels (VIPs) encompass a higher thermal resistance per unit of thickness compared to any other kind of insulation. However, their aging has often shown some critical concerns. To support the broader use of VIPs in the building sector, their physical properties, and in particular their thermal conductivity, over long-periods should remain consistent. This study investigates the effect of extreme temperature and relative humidity cycling on the service life and thermal conductivity of VIPs. The scope is to validate existing theoretical aging models for VIPs. First, the experimental results of the thermal conductivity for five VIPs in pristine and in laboratory-accelerated conditions are reported. The thermal conductivity in pristine conditions of the selected materials ranged between 0.0028 and 0.007 W/m K. The results of the thermal conductivity values after several aging conditions are reported in the temperature range from −20 °C to +40 °C. Then, an analytical aging method is employed to validate the collected data. Results show that aging has a more significant impact on the performance of VIPs with a core of fiberglass-core than on VIPs with a core of fumed silica. However, for all the investigated VIPs the service life corresponding to the thermal conductivity of 0.008 W/m K was higher than 25 years, confirming the reliability of these insulating systems.

中文翻译：

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真空绝热板理论老化实验验证

摘要 与任何其他类型的绝缘材料相比，真空绝缘板 (VIP) 具有更高的单位厚度热阻。然而，他们的老化往往表现出一些关键问题。为了支持在建筑领域更广泛地使用 VIP，它们的物理特性，尤其是它们的导热性，应该长期保持一致。本研究调查了极端温度和相对湿度循环对 VIP 的使用寿命和热导率的影响。范围是验证现有的 VIP 理论老化模型。首先，报告了五个 VIP 在原始和实验室加速条件下的热导率实验结果。所选材料在原始条件下的热导率介于 0.0028 和 0.007 W/m K 之间。在 -20 °C 至 +40 °C 的温度范围内报告了几种老化条件后的热导率值结果。然后，采用分析老化方法来验证收集的数据。结果表明，与具有气相二氧化硅核心的 VIP 相比，老化对具有玻璃纤维芯的 VIP 的性能具有更显着的影响。然而，对于所有研究的 VIP，对应于 0.008 W/m K 的热导率的使用寿命高于 25 年，证实了这些绝缘系统的可靠性。结果表明，与具有气相二氧化硅核心的 VIP 相比，老化对具有玻璃纤维芯的 VIP 的性能具有更显着的影响。然而，对于所有研究的 VIP，对应于 0.008 W/m K 的热导率的使用寿命高于 25 年，证实了这些绝缘系统的可靠性。结果表明，与具有气相二氧化硅核心的 VIP 相比，老化对具有玻璃纤维芯的 VIP 的性能具有更显着的影响。然而，对于所有研究的 VIP，对应于 0.008 W/m K 的热导率的使用寿命高于 25 年，证实了这些绝缘系统的可靠性。