Aerogel granulate glazing facades and their application potential from an energy saving perspective

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

doi:10.1016/j.apenergy.2014.12.053

Cited by 82 publications

(25 citation statements)

References 18 publications

(21 reference statements)

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“…The contribution of the innovative glazing system on thermal properties is remarkable: the thermal transmittance is 1.0-1.1 W/(m 2 ·K) for the aerogel glazing systems, in good agreement with literature data [7][8][9]14,19,31]. The U-value of the glazing depends on the thermal resistivity of each glass layer and on the gas (convective heat transfer) and radiation conductance in the interspace, where the radiation heat transfer is strictly related to the emissivity of the inner side of the glasses: with a low-e coating (the emissivity is about 0.1) and air (or argon) in the interspace, a significant reduction in the radiation conductance can be observed; the U-value of LOW-E DGU is in fact 1.6 W/(m 2 ·K) instead of 2.7 W/(m 2 ·K).…”

Section: Optical and Thermal Performancesupporting

confidence: 79%

“…Moreover, they allow for significant daylighting illuminance in buildings, improving visual comfort due to light diffusing, and could have energy demands for lights very similar to those of conventional solutions, especially in buildings with a high window-to-wall surface ratio. In general, translucent systems such as granular aerogel filled systems allow light to propagate uniformly within rooms, thus minimizing daylight problems, such as high contrast zones, and preventing glare, as shown in the literature [14,15,29]. Future studies should focus on the impact of aerogel systems on indoor visual comfort and on energy consumption for artificial lights in buildings.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…Many of these innovative solutions can be found in schools, commercial and industrial buildings, airports, etc., especially in the US and in Northern Europe [4,6,7,18]. The main application has been focusing on roof solutions [7,8], where an outside view is usually not essential or where they can also be integrated at façade spandrels [14].…”

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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Section: Optical and Thermal Performancesupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Optical and Thermal Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2017

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Numerical Study on the Thermal and Optical Performances of an Aerogel Glazing System with the Multivariable Optimization Using an Advanced Machine Learning Algorithm

Zheng

Zhou

2019

Advcd Theory and Sims

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The implementation of advanced materials in high‐efficient glazing system is important for green buildings. In this study, aerogel granules are implemented in the glazing system to form a translucent window with super‐insulating performance. An experimentally validated numerical modeling integrating both heat transfer model and optical model is developed to characterize the sophisticated heat transfer and solar radiation transmission mechanisms. Sensitivity analysis is presented with quantifiable contribution ratio of each parameter to the total heat gain. Instead of returning back to numerical modeling repeatedly, an advanced optimization engine implemented with a generic optimization methodology with competitive computational efficiency and accuracy is proposed by implementing the supervised machine learning and advanced optimization algorithms. The research results show that the developed artificial neural network modeling is more accurate and computational‐efficient than the traditional lsqcurvefit fitting methodology. In addition, the optimal case through the teaching‐learning‐based optimization is more robust and competitive than the optimal case through the particle swarm optimization in terms of the total heat gain. This study presents an in‐depth understanding of heat transfer and solar radiation transmission of nanoporous aerogel granules together with a robust optimal design, which is important for the promotion of green buildings with high‐energy performance.

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Novel glazing technologies to mitigate energy consumption in low-carbon buildings: a comparative experimental investigation

Cüce

Cuce

Riffat

2015

Int. J. Energy Res.

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Summary Buildings play a key role in total world energy consumption as a consequence of poor thermal insulation characteristics of facade materials. Among the elements of a typical building envelope, windows are responsible for the greatest energy loss because of their notably high overall heat transfer coefficients. About 60% of heat loss through the building fabric can be attributed to the glazed areas. In this respect, novel cost‐effective glazing technologies are needed to mitigate energy consumption, and thus to achieve the latest targets toward low/zero carbon buildings. Therefore in this study, three unique glazing products called vacuum tube window, heat insulation solar glass and solar pond window which have recently been developed at the University of Nottingham are introduced, and thermal performance analysis of each glazing technology is done through a comparative experimental investigation for the first time in literature. Standardized co‐heating test methodology is performed, and overall heat transfer coefficient (U‐value) is determined for each glazing product following the tests carried out in a calibrated environmental chamber. The research essentially aims at developing cost‐effective solutions to mitigate energy consumption because of windows. The results indicate that each glazing technology provides very promising U‐values which are incomparable with conventional commercial glazing products. Among the samples tested, the lowest U‐value is obtained from the vacuum tube window by 0.40 W/m2K, which corresponds to five times better thermal insulation ability compared to standard air filled double glazed windows. Copyright © 2015 John Wiley & Sons, Ltd.

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Aerogel granulate glazing facades and their application potential from an energy saving perspective

Cited by 82 publications

References 18 publications

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

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

Numerical Study on the Thermal and Optical Performances of an Aerogel Glazing System with the Multivariable Optimization Using an Advanced Machine Learning Algorithm

Novel glazing technologies to mitigate energy consumption in low-carbon buildings: a comparative experimental investigation

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