Streamlined life cycle assessment of transparent silica aerogel made by supercritical drying


Dowson, M., Grogan, M., Birks, T., Harrison, D. and Craig, S., 2012. Streamlined life cycle assessment of transparent silica aerogel made by supercritical drying. Applied Energy, 97, pp. 396-404.

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    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.


    Item Type Articles
    CreatorsDowson, M., Grogan, M., Birks, T., Harrison, D. and Craig, S.
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    URLURL Type
    DepartmentsFaculty of Science > Physics
    Research CentresCentre for Photonics and Photonic Materials
    Publisher StatementBirks_Applied-Energy_2011.pdf: NOTICE: this is the author’s version of a work that was accepted for publication in Applied Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Energy, vol 97, 2012, DOI 10.1016/j.apenergy.2011.11.047
    ID Code28081


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