Pedroso Marco, Silvestre José Dinis, Gomes M Glória, Bersch Jéssica D, Flores-Colen Inês
Civil Engineering Research and Innovation for Sustainability (CERIS), Departamento de Engenharia Civil, Arquitetura e Ambiente (DECivil), Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
Núcleo Orientado para a Inovação da Edificação (NORIE), Programa de Pós-Graduação em Engenharia Civil: Construção e Infraestrutura (PPGCI), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Osvaldo Aranha, 99, 7th Floor, Porto Alegre 90035-190, Brazil.
Gels. 2023 Oct 30;9(11):861. doi: 10.3390/gels9110861.
The current climate change context raises the demand for reducing energy and environmental impacts while keeping an economic balance and building users' comfort. Thermal insulation solutions are potential allies in ensuring the adequacy of existing buildings for challenging sustainability requirements. In this scenario, silica-aerogel-fibre-based thermal renders are innovative solutions for which integrated approaches still lack information, and they should be compared with benchmark multilayer solutions, such as those based on expanded polystyrene (EPS), extruded polystyrene (XPS), mineral wool (MW), and insulated corkboard (ICB), to evidence their prospective economic, environmental, and energy benefits. This paper quantifies the optimum insulation thicknesses, life cycle savings, payback periods, and environmental impacts of innovative thermal renders compared to conventional thermal insulation materials when applied as a retrofit in existing facade walls. The results show that cost-optimised thermal renders with sisal fibres led to the best overall performance. Higher heating needs led to higher optimum render thicknesses and life cycle savings. With a 0.02 m thickness, aerogel-fibre-based thermal renders outperformed other materials in terms of heating-degree days (HDD) from 1000 °C·day onwards; they can save approximately EUR 60∙m, 1000 MJ∙m, and 100 kg CO eq∙m while presenting a U-value 13% lower throughout their 30-year lifetime when compared with the second-best multilayer solution with XPS.
当前气候变化背景下，在保持经济平衡并营造用户舒适度的同时，降低能源和环境影响的需求日益增加。保温解决方案是确保现有建筑满足具有挑战性的可持续性要求的潜在助力。在这种情况下，基于二氧化硅气凝胶纤维的隔热涂料是创新解决方案，但仍缺乏综合方法方面的信息，应将其与基准多层解决方案进行比较，如基于膨胀聚苯乙烯（EPS）、挤塑聚苯乙烯（XPS）、矿棉（MW）和隔热软木板（ICB）的解决方案，以证明其潜在的经济、环境和能源效益。本文量化了创新隔热涂料与传统隔热材料相比，在现有外墙进行翻新应用时的最佳保温厚度、生命周期节省量、投资回收期和环境影响。结果表明，含剑麻纤维且成本优化的隔热涂料总体性能最佳。更高的供暖需求导致最佳涂料厚度和生命周期节省量增加。厚度为0.02米时，基于气凝胶纤维的隔热涂料在1000℃·日及以上的采暖度日（HDD）方面优于其他材料；与采用XPS的次优多层解决方案相比，在其30年的使用寿命期间，它们可节省约60欧元/平方米、1000兆焦/平方米和100千克二氧化碳当量/平方米，同时传热系数（U值）低13%。
