Alternative low cost based core systems for vacuum insulation panels

authors	Almeida, FA; Corker, J; Ferreira, N; Neto, MA; Fan, MZ; Beyrichen, H; Caps, R
nationality	International
journal	CIENCIA & TECNOLOGIA DOS MATERIAIS
author keywords	Vacuum insulation panels; core materials; thermal conductivity; near zero-energy buildings
abstract	Vacuum Insulation Panels (V1P) are presently regarded as one of the most promising state-of-the-art building insulation solutions. Based on their thermal conductivities of about 4 mW/(m K), with a thickness below 40 mm, they have a great potential for near zero-energy buildings (nZEB) and for applications where high insulation standards and living space savings are crucial. However, VIP are still unaffordable for the majority of homeowners and contractors (up to 100 /m2), mostly due to the cost of the conventional fumed silica used as core material to secure the long service life requirements of building applications. This study presents the early developments of alternative cores engineered for VIP targeting the building market. The adopted strategy is to replace fumed silica with cheaper natural inorganic/organic lightweight materials or, alternatively, by creating multimaterial nanostructured composite matrices. The different compositions were analysed according to their physical, chemical and morphological characteristics and their respective thermal conductivity ranks. Promising lambda values as low as 5.3 mW/(m K) have been achieved for gas pressures below 10 mbar (1 kPa). It is expected that these novel core systems will be capable of suppressing the different heat transfer mechanisms at more reasonable costs than the current VIP fumed silica ones. (C) 2017 Portuguese Society of Materials (SPM). Published by Elsevier Espafia. S.L.U. All rights reserved.
publisher	ELSEVIER ESPANA S I
issn	0870-8312
year published	2017
volume	29
issue	1
beginning page	E151
ending page	E156
digital object identifier (doi)	10.1016/j.ctmat.2016.10.002
web of science category	Materials Science, Multidisciplinary
subject category	Materials Science
unique article identifier	WOS:000412098700029