Silica aerogel granulate material for thermal insulation and daylighting

Reim, Michaela; Körner, Werner; Manara, Jochen; Korder, S.; Arduini-Schuster, M.; Ebert, Hans-Peter; Fricke, J.

doi:10.1016/j.solener.2004.08.032

Cited by 229 publications

(110 citation statements)

References 7 publications

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“…This is consistent with the results for nitrogen at 50-10 5 Pa and SRM at 10 4 -10 5 Pa. Although the thermal conductivity is higher for our cryogel powders than for aerogels prepared by supercritical drying in reports [24,36], our technique is simple and inexpensive, and can be used in large-scale thermal insulating applications at low pressures, such as vacuum insulating plates [37] and silica granulate insulating materials [38,39].…”

Section: Thermal Conductivitysupporting

confidence: 88%

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Liu

Tanaka

et al. 2012

Science and Technology of Advanced Materials

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Nanoporous silica cryogels with a high specific surface area of 1095 m 2 g −1 were fabricated using tert-butyl alcohol as a reaction solvent, via a cost-effective sol-gel process followed by vacuum freeze drying. The total time of cryogel production was reduced markedly to one day. The molar ratio of solvent/precursor, which was varied from 5 to 13, significantly affected the porous structure and thermal insulating properties of the cryogels. The silica cryogels with low densities in the range of 0.08-0.18 g cm −3 and thermal conductivities as low as 6.7 mW (m · K) −1 at 100 Pa and 28.3 mW (m · K) −1 at 10 5 Pa were obtained using this new technique.

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Section: Thermal Conductivitysupporting

confidence: 88%

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Liu

Tanaka

et al. 2012

Science and Technology of Advanced Materials

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“…For further information on aerogel granules and their properties see works by Reim et al (2004Reim et al ( , 2005. The low T vis (as a result of sufficient large thickness and thus low U g ), together with the high costs, are the major downsides of aerogel glazing at the moment, as the products are more suited to roofing and facades in commercial buildings and sports halls and are not yet in a position to challenge conventional residential windows where transparent (and not translucent) glazing most often will be a requirement.…”

Section: Aerogelsmentioning

confidence: 99%

Fenestration of today and tomorrow: A state-of-the-art review and future research opportunities

Jelle

Hynd

Gustavsen

et al. 2012

Solar Energy Materials and Solar Cells

466

216

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Fenestration of today is continuously being developed into the fenestration of tomorrow, hence offering a steadily increase of daylight and solar energy utilization and control, and at the same time providing a necessary climate screen with a satisfactory thermal comfort. Within this work a state-of-the-art market review of the best performing fenestration products has been carried out, along with an overview of possible future research opportunities for the fenestration industry. The focus of the market review was low thermal transmittance (Uvalue). The lowest centre-of-glass U g -values found was 0.28 W/(m 2 K) and 0.30 W/(m 2 K), which was from a suspended coating glazing product and an aerogel glazing product, respectively. However, the majority of high performance products found were triple glazed. The lowest frame U-value was 0.61 W/(m 2 K). Vacuum glazing, smart windows, solar cell glazing, window frames, self-cleaning glazing, low-emissivity coatings and spacers were also reviewed, thus also representing possibilities for controlling and harvesting the solar radiation energy. Currently, vacuum glazing, new spacer materials and solutions, electrochromic windows and aerogel glazing seem to have the largest potential for improving the thermal performance and daylight and solar properties in fenestration products. Aerogel glazing has the lowest potential U-values, ~ 0.1 W/(m 2 K), but requires further work to improve the visible transmittance. Electrochromic vaccum glazing and evacuated aerogel glazing are two vacuum related solutions which have a large potential. There may also be opportunities for completely new material innovations which could revolutionize the fenestration industry.

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“…(2) for dry VIPs with two more terms to include the effect of moisture: (14) where l humid is the thermal conductivity by conduction of adsorbed water in the core and l wv the thermal conductivity by heat conduction in water vapour. As shown in Fig.…”

Section: Thermal Conductivity Of Fumed Silicamentioning

confidence: 99%

“…21. Structure of the nano-porous SiO 2 network of silica aerogel [14] and a Scanning Electron Microscopy SEM image of the structure of clay aerogel [13].…”

Section: Possible Improvements For Current Vipsmentioning

confidence: 99%