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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/6468

Title: Streamlined life cycle assessment of transparent silica aerogel made by supercritical drying
Authors: Dowson, M
Grogan, M
Birks, T
Harrison, DJ
Craig, S
Keywords: Silica aerogel
Transparent insulation
Life cycle assessment
LCA
Advanced glazing
Publication Date: 2011
Publisher: Elsevier
Citation: Applied Energy, 97: 396-404, Sep 2012
Abstract: When developing sustainable building fabric technologies, it is essential that the energy use and CO2 burden arising from manufacture does not outweigh the respective in-use savings. This study investigates this paradigm by carrying out a streamlined life cycle assessment (LCA) of silica aerogel. This unique, nanoporous translucent insulation material has the lowest thermal conductivity of any solid, retaining up to four times as much heat as conventional insulation, whilst being highly transparent to light and solar radiation. Monolithic silica aerogel has been cited as the ‘holy grail’ of future glazing technology. Alternatively, translucent granular aerogel is now being produced on a commercial scale. In each case, many solvents are used in production, often accompanied by intensive drying processes, which may consume large amounts of energy and CO2. To date, there has been no peer-reviewed LCA of this material conducted to the ISO 14000 standard. Primary data for this ‘cradle-to-factory gate’ LCA is collected for silica aerogel made by low and high temperature supercritical drying. In both cases, the mass of raw materials and electricity usage for each process is monitored to determine the total energy use and CO2 burden. Findings are compared against the predicted operational savings arising from retrofitting translucent silica aerogel to a single glazed window to upgrade its thermal performance. Results should be treated as a conservative estimate as the aerogel is produced in a laboratory, which has not been developed for mass manufacture or refined to reduce its environmental impact. Furthermore, the samples are small and assumptions to upscale the manufacturing volume occur without major changes to production steps or equipment used. Despite this, parity between the CO2 burden and CO2 savings is achieved in less than 2 years, indicating that silica aerogel can provide a measurable environmental benefit.
Description: This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2011 Elsevier
Sponsorship: This work is funded by the EPSRC, Brunel University and Buro Happold Ltd, the University of Bath is funded by the EPSRC grant EP/F018622/1.
URI: http://www.sciencedirect.com/science/article/pii/S0306261911007446
http://bura.brunel.ac.uk/handle/2438/6468
DOI: http://dx.doi.org/10.1016/j.apenergy.2011.11.047
ISSN: 0306-2619
Appears in Collections:Design
Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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