Bae Minjung, Kim Sunsook, Kang Jaesik
Department of Building Energy Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of Korea.
Department of Smart Convergence Architecture, College of Engineering, Ajou University, Suwon 16499, Republic of Korea.
Materials (Basel). 2023 Oct 3;16(19):6542. doi: 10.3390/ma16196542.
International standards for vacuum insulation panels (VIPs) include an accelerated test method and a minimum quality standard for evaluating their long-term thermal performance after 25 years. The accelerated test method consists of various tests according to the characteristics of the core material and requires six months (180 days) at minimum. Herein, we propose an accelerated method for determining the long-term thermal performance of fumed-silica VIPs by shortening the required time and simplifying the procedure. Highly accelerated conditions (80 °C and 70% Relative humidity (RH)) were set for the evaluation method, using the maximum temperature (80 °C) cited in international standards and compared with the accelerated test method under accelerated conditions (50 °C and 70% RH). The inner-pressure increase rate of the VIP samples after conditioning for approximately 70 days was similar to that after conditioning for 180 days under highly accelerated and accelerated conditions, respectively. In addition, the estimated long-term thermal conductivities of the fumed-silica VIP were derived as 0.0076 and 0.0054 W/m·K under highly accelerated and accelerated conditions, respectively. These accelerated methods can be used to produce fumed-silica VIPs with similar long-term thermal conductivities. Therefore, the accelerated test method for long-term thermal performance using the highly accelerated conditions can be evaluated using a test that involves conditioning the sample for approximately 70 days under 80 °C and 70% RH.
真空绝热板（VIPs）的国际标准包括一种加速测试方法和一个用于评估其25年后长期热性能的最低质量标准。该加速测试方法根据芯材特性包括各种测试，且至少需要六个月（180天）。在此，我们提出一种通过缩短所需时间和简化程序来确定气相二氧化硅VIPs长期热性能的加速方法。该评估方法设定了高加速条件（80°C和70%相对湿度（RH）），采用国际标准中引用的最高温度（80°C），并与加速条件（50°C和70%RH）下的加速测试方法进行比较。在高加速和加速条件下，气相二氧化硅VIP样品在约70天的老化处理后的内压增加率分别与180天老化处理后的相似。此外，在高加速和加速条件下，气相二氧化硅VIP的估计长期热导率分别为0.0076和0.0054W/m·K。这些加速方法可用于生产具有相似长期热导率的气相二氧化硅VIPs。因此，使用高加速条件的长期热性能加速测试方法可通过在80°C和70%RH下对样品进行约70天老化处理的测试来评估。
