Insulating glazing units with silica aerogel granules: The impact of particle size

Gao, Tao; Jelle, Bjørn Petter; Ihara, Takeshi; Gustavsen, Arild

doi:10.1016/j.apenergy.2014.04.037

Cited by 115 publications

(56 citation statements)

References 33 publications

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“…For additional information on windows and glazing technologies, see e.g., the studies by Baetens et al [102] for smart windows, Bellia et al [129] for solar shading systems, Cuce and Riffat [130] for innovative glazing technologies, Gao et al [131,132] and Ihara et al [133][134][135] for aerogel-related glazing aspects, Grynning et al [136] for windows as energy losers or energy gainers, Gustavsen et al [137] for key elements and materials performance targets for highly insulating window frames, Hee et al [138] for daylighting and energy savings in buildings, Jelle [139,140] for solar radiation glazing factor factors and electrochromics, and Jelle et al [7,141] for fenestration of today and tomorrow and solar protection factors.…”

Section: Various Aspectsmentioning

confidence: 99%

Building Integrated Photovoltaics: A Concise Description of the Current State of the Art and Possible Research Pathways

Jelle

2015

Energies

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Abstract:Building integrated photovoltaics (BIPV) offer an aesthetical, economical and technical solution to integrate solar cells harvesting solar radiation to produce electricity within the climate envelopes of buildings. Photovoltaic (PV) cells may be mounted above or onto the existing or traditional roofing or wall systems. However, BIPV systems replace the outer building envelope skin, i.e., the climate screen, hence serving simultanously as both a climate screen and a power source generating electricity. Thus, BIPV may provide savings in materials and labor, in addition to reducing the electricity costs. Hence, for the BIPV products, in addition to specific requirements put on the solar cell technology, it is of major importance to have satisfactory or strict requirements of rain tightness and durability, where building physical issues like e.g., heat and moisture transport in the building envelope also have to be considered and accounted for. This work, from both a technological and scientific point of view, summarizes briefly the current state-of-the-art of BIPV, including both BIPV foil, tiles, modules and solar cell glazing products, and addresses possible research pathways for BIPV in the years to come.

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Section: Various Aspectsmentioning

confidence: 99%

Building Integrated Photovoltaics: A Concise Description of the Current State of the Art and Possible Research Pathways

Jelle

2015

Energies

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“…When the aerogel layer thickness increases to 60 mm, a U-value of 0.3 W/(m 2 ·K) can be achieved [16,22]. When compared to conventional glazings, the ones with granular aerogel also have significant benefits when used for roof solutions, because U-values are not dependent on the tilted angle to the vertical plane, for example, in gas-filled glazings [8,22].…”

Section: Introductionmentioning

confidence: 84%

“…For this reason, the low-e coating does not influence the overall heat transfer in the window when aerogel is placed in the interspace between the glass layers (Table 3). Therefore, the thermal conductivity of silica aerogel granules is the main responsible for the glazing U-value, and the particle size has an impact on thermal performance of the glazing, as shown in the literature [14,16,31]. In particular, small granules allow a better performance than the larger ones: for instance, the thermal conductivity varies in the 19-21 mW/mK range at 10 • C, when the average particle size increases [31].…”

Section: Optical and Thermal Performancementioning

confidence: 99%

“…Silica aerogels, both in monolithic and granular translucent form, can be used in high-insulated nanogel windows: transparent monolithic panes were developed 20-30 years ago, but their application in glazing systems has still not penetrated the market, and few prototypes have been manufactured for research purposes [12,13]; for these reasons, building applications have focused on glazing systems with granular aerogels [14][15][16][17]. Different translucent daylighting systems with granular aerogel have been emerging in the market.…”

Section: Introductionmentioning

confidence: 99%

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High Energy-Efficient Windows with Silica Aerogel for Building Refurbishment: Experimental Characterization and Preliminary Simulations in Different Climate Conditions

2017

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Abstract:The paper deals with the potential of high energy-efficient windows with granular silica aerogel for energy saving in building refurbishment. Different glazing systems were investigated considering two kinds of granular silica aerogel and different glass layers. Thermal transmittance and optical properties of the samples were measured and used in building simulations. The aerogel impact on heat transfer is remarkable, allowing a thermal transmittance of 1.0-1.1 W/(m 2 ·K) with granular aerogel in interspace only 15 mm in thickness. A 63% reduction in U-value was achieved when compared to the corresponding conventional windows, together with a significant reduction (30%) in light transmittance. When assembled with a low-e glass, the U-value reduction was lower (31%), but a moderate reduction in light transmittance (about 10%) was observed for larger granules. Energy simulations for a case study in different climate conditions (hot, moderate, and cold) showed a reduction in energy demand both for heating and cooling for silica aerogel glazing systems, when compared to the conventional ones. The new glazings are a suitable solution for building refurbishment, thanks to low U-values and total solar transmittance, also in warm climate conditions.

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“…Aerogel is a highly porous nano-structured and light material: The porosity is higher than 90% and the density is in the 50-200 kg/m 3 range; the thermal conductivity is very low (down to 0.010 W/m K) [5][6][7]. Different glazing systems with translucent granular aerogels in interspace (polycarbonate panels, structural panels for façades, insulated glasses) were developed, offering excellent thermal performance, a good solar heat gain, and a good sound insulation [8][9][10][11][12]. Opaque aerogels, such as flexible aerogel blankets, were proposed in order to reduce thermal bridges in the building envelope, offering a thermal conductivity of about 0.013 W/m K [13].…”

Section: Introductionmentioning

confidence: 99%

Development of Innovative Aerogel Based Plasters: Preliminary Thermal and Acoustic Performance Evaluation

et al. 2014

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Abstract:The thermal and acoustic properties of innovative insulating systems used as building coatings were investigated: Granular silica aerogel was mixed with natural plaster in different percentages. This coating solution is transpiring and insulating, thanks to the use of a natural lime coat and aerogel, a highly porous light material with very low thermal conductivity. The thermal conductivity of the proposed solution was evaluated by means of a Heat Flow meter apparatus (EN ISO 12667), considering different percentages of aerogel. The natural plaster without aerogel has a thermal conductivity of about 0.50 W/m K; considering a percentage of granular aerogel of about 90% in volume, the thermal conductivity of the insulating natural coating falls to 0.050 W/m K. Increasing the percentage of granular aerogel, a value of about 0.018-0.020 W/m K can be reached. The acoustic properties were also evaluated in terms of the acoustic absorption coefficient, measured by means of a Kundt's Tube (ISO 10534-2). Two samples composed by a plasterboard support, an insulation plaster with aerogel (thicknesses 10 mm and 30 mm respectively) and a final coat were assembled. The results showed that the absorption coefficient strongly depends on the final coat, so the aerogel-based plaster layer moderately influences the final value. The application of this innovative solution can be a useful tool for new buildings, but also for the refurbishment of existing ones. This material is in development: until now, the best value of the thermal conductivity obtained from manufacturers is about 0.015 W/m K. OPEN ACCESSSustainability 2014, 6 5840 Keywords: aerogel based plasters; silica aerogel; thermal and acoustic performance; refurbishment of buildings

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Insulating glazing units with silica aerogel granules: The impact of particle size

Cited by 115 publications

References 33 publications

Building Integrated Photovoltaics: A Concise Description of the Current State of the Art and Possible Research Pathways

Building Integrated Photovoltaics: A Concise Description of the Current State of the Art and Possible Research Pathways

High Energy-Efficient Windows with Silica Aerogel for Building Refurbishment: Experimental Characterization and Preliminary Simulations in Different Climate Conditions

Development of Innovative Aerogel Based Plasters: Preliminary Thermal and Acoustic Performance Evaluation

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