Du Mu, Yang Huilin, Huang Jiachen, Tang Guihua, Zhang Xuankai, Niu Dong
Institute for Advanced Technology, Shandong University, Jinan 250061, China.
Shenzhen Research Institute of Shandong University, Shenzhen 518057, China.
Langmuir. 2024 Sep 12. doi: 10.1021/acs.langmuir.4c02713.
The thermal insulation performance of windows is crucial for energy-efficient buildings. Windows are typically the weakest part of the building envelope, regarding thermal insulation. Due to its excellent thermal insulation and high transparency, silica aerogel shows great promise as a window material. However, moisture can impact the effectiveness of the aerogel, leading to poor visibility and reduced thermal insulation. This study simulated a silica aerogel with varying moisture levels using the combination of diffusion-limited cluster aggregation, discrete dipole approximation, and Monte Carlo methods. The effects of the moisture content, thickness, porosity, and particle size on thermal conductivity, solar transmittance, and haze were analyzed. Visual properties of the aerogels were also considered. The energy consumption of a 30 m room under different climates was simulated using TRNSYS to assess the energy-saving potential of silica aerogel glass. The findings indicate that a higher moisture content leads to decreased solar transmittance and increased thermal conductivity of aerogels. Silica aerogel glass is more energy efficient than single-layer float glass, with the dry aerogel performing better in cold climates but worse in hot climates. This study provides insights for designing aerogel glass that optimizes solar transmittance and thermal insulation to enhance building comfort and energy efficiency.
窗户的保温性能对于节能建筑至关重要。就保温而言，窗户通常是建筑围护结构中最薄弱的部分。由于其出色的保温性能和高透明度，二氧化硅气凝胶作为一种窗户材料具有很大的潜力。然而，水分会影响气凝胶的效能，导致能见度降低和保温性能下降。本研究使用扩散限制凝聚、离散偶极近似和蒙特卡罗方法相结合的方式模拟了具有不同水分含量的二氧化硅气凝胶。分析了水分含量、厚度、孔隙率和粒径对热导率、太阳透过率和雾度的影响。还考虑了气凝胶的视觉特性。使用TRNSYS模拟了不同气候条件下一个30立方米房间的能耗，以评估二氧化硅气凝胶玻璃的节能潜力。研究结果表明，较高的水分含量会导致气凝胶的太阳透过率降低和热导率增加。二氧化硅气凝胶玻璃比单层浮法玻璃更节能，干燥的气凝胶在寒冷气候下表现更好，但在炎热气候下表现较差。本研究为设计气凝胶玻璃提供了见解，以优化太阳透过率和保温性能，从而提高建筑舒适度和能源效率。
