论文部分内容阅读
建筑保温材料可以大幅度降低能耗。目前国际保温材料领域的研究重点是超级绝热材料,它具体又可细分为真空绝热板和纳米孔绝热两个方向。真空绝热板的导热系数可低至(0.002~0.005)W/m×K,由于其低导热系数是建立在保证真空度的基础上,使其使用受限。而气凝胶是纳米孔绝热材料的典型代表,以其低密度、高孔隙率、极低导热系数等优点,在航天、建筑等领域具有广大的应用前景,被称为“固态蓝烟”。本文重点介绍了SiO_2气凝胶复合材料隔热的传热机理、当前对于其力学强度和传热性能的一些改进研究、以及模拟中常用的导热模型。最后对于未来气凝胶的发展作了一些展望。
Building insulation can significantly reduce energy consumption. At present, the research focus in the field of international thermal insulation materials is super thermal insulation material, which can be subdivided into vacuum insulation panels and nano-holes in both directions. Thermal conductivity of vacuum insulation panels can be as low as (0.002 ~ 0.005) W / m × K, because of its low thermal conductivity is based on the vacuum to ensure that its use is limited. Airgel, on the other hand, is a typical representative of nanoporous thermal insulation materials. With its advantages of low density, high porosity and very low thermal conductivity, aerogels have a wide range of applications in aerospace and construction fields. ". This paper focuses on the heat transfer mechanism of SiO 2 aerogels composite insulation, the current improvement of its mechanical strength and heat transfer performance, as well as the commonly used thermal model in the simulation. Finally, some prospects for the future development of airgel.