Highly efficient insulating systems help reduce heat losses and promote building energy efficiency due to their very low thermal conductivity. However, when applied to outdoor surfaces, climate conditions exposure might deteriorate the material's properties, compromising the building's energy performance over its lifetime. In the framework of a European research project (Horizon2020 - Wall-ACE), a novel aerogel-based insulating external render was developed, characterized, and submitted to a large-scale weathering test to assess its durability. The test rig was equipped with hygrothermal, impedance, and heat flux sensors, used as reference data to create and calibrate a 2D heat and moisture transfer (HMT) model that compared impedance readings and predicted water content. Before and after the test, thermal properties, e.g., U-Value, were measured to assess the weather impact on the exterior render performance, which were also investigated through building energy simulation (BES). In this article, both experimental and numerical procedures are described. Results show high water absorption in the analyzed render systems during weathering, especially at the innermost layer, demonstrated by both impedance and simulation outputs. An adjusted base coat and attention at the execution phase can avoid such intrusion of water. Nevertheless, a low thermal conductivity degradation was measured after the large-scale test, showing that the aerogel-based insulating system's effectiveness is not harshly compromised throughout its life-cycle.

高效的隔热系统因其极低的热导率而有助于减少热损失并提高建筑能源效率。然而，当应用于室外表面时，暴露在气候条件下可能会降低材料的性能，从而影响建筑物在其整个生命周期内的能源性能。在欧洲研究项目 (Horizo​​n2020 - Wall-ACE) 的框架内，开发了一种新型气凝胶绝缘外部渲染，并对其进行了大规模老化试验以评估其耐久性。测试台配备了湿热、阻抗和热通量传感器，用作参考数据来创建和校准二维热湿传递 (HMT) 模型，该模型比较阻抗读数和预测的含水量。测试前后，热性能，例如 U 值，进行测量以评估天气对外部渲染性能的影响，还通过建筑能源模拟 (BES) 进行了调查。在本文中，描述了实验和数值程序。结果表明，在风化过程中，所分析的渲染系统的吸水率很高，尤其是在最内层，阻抗和模拟输出都证明了这一点。在执行阶段调整底漆和注意可以避免这种水的侵入。然而，在大规模测试后测量到低热导率退化，表明基于气凝胶的绝缘系统的有效性在其整个生命周期中并未受到严重损害。在本文中，描述了实验和数值程序。结果表明，在风化过程中，所分析的渲染系统的吸水率很高，尤其是在最内层，这通过阻抗和模拟输出来证明。在执行阶段调整底漆和注意可以避免这种水的侵入。然而，在大规模测试后测量到低热导率退化，表明基于气凝胶的绝缘系统的有效性在其整个生命周期中并未受到严重损害。在本文中，描述了实验和数值程序。结果表明，在风化过程中，所分析的渲染系统的吸水率很高，尤其是在最内层，阻抗和模拟输出都证明了这一点。调整后的底漆和执行阶段的注意可以避免这种水的侵入。然而，在大规模测试后测量到低热导率退化，表明基于气凝胶的绝缘系统的有效性在其整个生命周期中并未受到严重损害。在执行阶段调整底漆和注意可以避免这种水的侵入。然而，在大规模测试后测量到低热导率退化，表明基于气凝胶的绝缘系统的有效性在其整个生命周期中并未受到严重损害。在执行阶段调整底漆和注意可以避免这种水的侵入。然而，在大规模测试后测量到低热导率退化，表明基于气凝胶的绝缘系统的有效性在其整个生命周期中并未受到严重损害。