A state-of-the-art review of novel aerogel insulation materials for building exterior walls

The unique network-like framework and nanopore structure of aerogel endow it with excellent thermal insulation performance. The thermal conductivity is as low as 0.012 W/(m<middle dot>K), far lower than 0.035-0.040 W/(m<middle dot>K) of traditional thermal insulation materials. Research and industrialization of nanoaerogels as building insulation have gained increasing attention in recent years. This paper discusses the application status, existing challenges, and solutions in the field of building external wall energy conservation and insulation based on nanoaerogel materials. First, it reviews the research progress of nanoaerogels and the development status of traditional building exterior wall insulation materials. The external wall using nano aerogel can reduce the heat loss by about 40%. Second, it focuses on the characteristics and research status of several types of aerogel thermal insulation products for buildings. Some products show that the energy efficiency has been improved to 50% in practical applications. Finally, it analyzes existing challenges of nanoaerogels in the application of building external wall thermal insulation and summarizes the development direction of industrialization research. Building external wall thermal insulation and the application and development of aerogels in the field of building energy conservation are facilitated by this analysis.