Aerogel granule aging driven by moisture and solar radiation

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

doi:10.1016/j.enbuild.2015.06.017

Cited by 53 publications

(26 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…With time, due to the factors such as UV radiation, pane movement and deterioration in seal adhesion, the cavity could experience humidification and dehumidification cycling. Aerogel's hydrophobic surface (consists mostly of methyl groups) can decompose under exposure to solar irradiation (primarily from short-wavelength 290-370 nm) over time (Ihara, Jelle, Gao, & Gustavsen, 2015).…”

Section: Accelerated Ageing Of Aerogelmentioning

confidence: 99%

Thermal and Optical Performance of Granular Aerogel Glazing After Accelerated Ageing

Novik¹

2023

Preprint

View full text Add to dashboard Cite

The glazing portion of a window has dual but conflicting functions where it is required to provide views to the outside, but also have good thermal resistance. Glazing is usually one of the weak points in the thermal envelope and tends to age quicker and to a higher severity. The combination of granular aerogel inside a glazing cavity is still relatively new product, but could offer both great thermal and optical performance. Currently available durability data for granular aerogel glazing is scarce. Accelerated ageing was used to generate real life equivalent stresses of 13.5‐74 years by exposing a set of samples to several climatic conditions. The center of glass U‐value increased by a maximum of 4% after accelerated ageing in the oven and the temperature cycling machine. A maximum reduction of 211% was measured in the visible transmittance after accelerated ageing climatic and humidity chambers.

show abstract

“…Currently, aerogel products are available for construction as monolithic panels with high transparency [18], small size granules [19,20], or thermal insulation blankets [21,22]. Each of these products can be employed to improve the thermal performance of mortars and concretes; plasters for opaque systems [16,23]; or translucent/transparent systems, such as insulating glazed units, suitably filled with monolithic or granular aerogels [10,24,25].…”

Section: Aerogel Products For Constructionsmentioning

confidence: 99%

Modeling of an Aerogel-Based “Thermal Break” for Super-Insulated Window Frames

et al. 2020

View full text Add to dashboard Cite

Research activities in the field of innovative fixtures are continuously aiming at increasing their thermal and optical performances to offer optimal exploitation of daylight and solar gains, providing effective climate screen, according to increasing standards for indoor comfort and energy saving. Within this work, we designed an innovative aerogel-based "thermal break" for window frames, so as to consistently reduce the frame conductance. Then, we compared the performance of this new frame both with currently used and obsolete frames, present in most of the existing building stock. Energy savings for heating and cooling were assessed for different locations and confirmed the potential role played by super-insulating materials in fixtures for extremely rigid climates. Buildings 2020, 10, x FOR PEER REVIEW 3 of 15 were studied. The window frame was made of wood and aluminium and an interposed aerogel 92 thermal break was also used. A finite element method analysis of a window frame containing aerogel 93 was carried out, obtaining a high performance level. This innovative window was compared with 94 others, embodying different frames, as explained in the Methodology section, by means of 95 simulations in test rooms within the Energyplus software platform [33]. Energy consumption for 96 heating and cooling was tested within a typical office on all possible exposures, in two locations with 97 very different climates: the Canadian city of Toronto and Bari, in Southern Italy. 98 2. Materials and Methods 99 2.1. Frame and window description100 This innovative window (Figure 1), specifically designed to meet the highest thermal insulation 101 standards, includes a three-pane glazing. The internal glazing embodied a low emittance coating 102 (ε=0.21) deposited on face 5, i.e., the outer face of the internal pane. The aerogel section (the red part 103 in Figure 2) was conveniently surrounded by a thin acrylonitrile-butadienestyrene (ABS) skin (2 mm 104 thick), and embodied granular aerogel within the frame section, thus behaving like a super-insulating 105 "thermal break", between the external aluminium frame and the internal wooden frame. The same 106 ABS skin is generally adopted in existing commercial frames using the same technology, to embody 107 expanded polystyrene (Isover EPS 035) insulating material. Cabot Enova IC3100 granular aerogel 108 was used, with granule size spanning between 2 and 40 μm, a thermal conductivity of 0.012 W/m•K 109 at ambient temperature, and very low density, ranging from 120 to 150 kg/m 3 according to technical 110 specifications of the material. The coupling between the aerogel section and the wooden frame was 111 made by using a stripe of aerogel blanket, Pyrogel-XTE by Aspen, with comparable thermal 112 conductivity (less than 0,02 W/m•K) suitably glued and mechanically fixed to the frame. 113 114 below, the wooden profile, facing the indoor space.118 2.2. Finite element method 119 The thermal heat loss due to the transmission through windows is strongly affected by the 120 technical f...

show abstract

Aerogel granule aging driven by moisture and solar radiation

Cited by 53 publications

References 20 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

Thermal and Optical Performance of Granular Aerogel Glazing After Accelerated Ageing

Modeling of an Aerogel-Based “Thermal Break” for Super-Insulated Window Frames

Contact Info

Product

Resources

About