A review of transparent-reflective switchable glass technologies for building facades

Tong, Shi Wun; Goh, Wei Peng; Xiao, Huang

doi:10.1016/j.rser.2021.111615

Cited by 55 publications

(17 citation statements)

References 84 publications

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“…Therefore, their implementation in a building envelope can be also considered as dynamic insulation, as study [19] demonstrates, where windows varying their visible transmittance between 62% and 2%, accomplished about 45% lower energy demands compared to conventional single pane windows. Furthermore, a very promising technology is transparent-reflective windows, which in contrast to EC type regulate their infrared radiation transmittance along with their reflectivity, while they do not intervene to the visible radiation spectrum [20].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Proceeding to the variable insulation technologies, the combination of PCMs and thermochromic materials for roof implementation [17], is feasible after a proper replacement of the existing roof stratification with the desired materials. The different window types [18]- [20], promising to update the buildings performance can be also applied to an existing building after the replacement of the old windows. Another potential system for a typical building's renovation can be considered the one with the rotating insulation layers [21][22], whose operating mechanism is rather simple.…”

Section: Application Potentialsmentioning

confidence: 99%

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Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Karanafti

Theodosiou

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Towards the achievement of zero-emission buildings, conventional envelope solutions have started to become outdated. The concept of Dynamic thermal insulation is an innovative approach, still under development, that attracts a continuously and fast growing scientific and research interest, mainly due to its perfect alignment with the targets of a zero-carbon future. The aim of this study is to investigate a variety of such systems that are capable to adjust the envelope’s thermal resistance based on the building’s needs. The study follows a two-levelled categorization approach. Initially, the classification focuses on whether an assembly switches or varies its thermal properties within a range, whilst the operating principle is used for further categorization. The systems under investigation, are further categorized based on their adequacy as a measure for the implementation on existing buildings’ energy retrofit. This innovative categorization takes into consideration properties like operational and control complexity, mechanical equipment requirements, construction simplicity, cost, etc. The results reveal great potential for this technology and indicate a need for further investigation on issues related to their sustainability potential in new or in existing buildings.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Application Potentialsmentioning

confidence: 99%

Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Karanafti

Theodosiou

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Since the electric switching relies on a low‐voltage (≈1–10 V) realignment due to dielectric coupling between the LC director and electric field, [ 47 ] the energy consumption needed for switching is minimal. We discuss how the demonstrated sub‐second switching of the near‐infrared‐based solar gain can be utilized in installed and retrofit glazing products [ 26 ] developed from thin films of such nanoplate dispersions confined between glass and plastic substrates, respectively. We conclude with a discussion of the potential of plasmonic LC nanocolloidal dispersions in enabling the next‐generation of glazing products.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, electrically actuated active light modulation using electrochromic and liquid crystalline materials has enabled next-generation smart glass technology. [25][26][27] In recent years, plasmonic transparent conducting oxides have been implemented in electrochromic devices for spectrally selective light absorption, which has significantly reduced the near-infrared solar gain while maintaining good visible light transmittance. [28][29][30][31][32][33][34] On the other hand, using cholesteric LCs both static and dynamic control has been demonstrated by selectively reflecting a band of near-infrared (NIR) wavelengths.…”

mentioning

confidence: 99%

Electrical Switching of Nematic Plasmonic Nanocolloids for Infrared Solar Gain Control

Ghosh

Smalyukh

2022

Advanced Optical Materials

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Controlling solar gain is essential to reduce the energy consumption by residential and commercial buildings, which are responsible for ≈40% of all energy generated globally. However, the dynamic control of solar gain in the near‐infrared that corresponds to ≈50% of the overall Sun's energy at the Earth's surface, separately from the visible spectral range has been a challenge, albeit commercial coatings provide passive control while retaining highly visible transmission. To address this problem, in this paper switchable silver colloids (SSCs) are demonstrated, colloidal analogs of the common silver coatings used for solar gain control. When dispersed in a nematic liquid crystal, orientations of such plasmonic silver nanoplates are controlled by ≈1 V low‐voltage electric fields, allowing for sub‐second switching of the near‐infrared‐based solar gain. Installed and retrofit products made from thin films of such nanoplate dispersions confined between glass and plastic substrates, respectively, exhibit electrically controlled infrared‐based solar gain while retaining high visible‐range transparency, low haze, and high color rendering index. This study's findings reveal a great potential of soft‐matter systems in addressing energy‐related problems.

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“…This energy is used in thermal comfort and artificial ventilation systems . Buildings experience considerable heat loss or gain through windows, which affects the thermal comfort of buildings’ occupants. , For a sustainable building design, windows significantly contribute to natural light consumption and building energy flows. Windows are one of the most influential building envelopes that allow external daylight and heat gain to be permitted inside the building.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Paraffin-Incorporated In₂O₃/ZnO Multifold Smart Glazing Composite for the Self-Cleaning and Energy-Saving Built Environment

Roy

Ullah

Alzahrani

et al. 2022

ACS Sustainable Chem. Eng.

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The thermal performance of window glazing requires improvement for a sustainable built environment at an acceptable cost. The current work demonstrates a multifold smart composite consisting of an optimized In 2 O 3 /ZnO–polymethyl methacrylate–paraffin composite to reduce heat exchange through the combined self-cleaning and energy-saving envelope of the smart built environment. This work has attempted to develop a smart composite coating that combines photosensitive metal oxide and phase change materials and investigate their thermal comfort performance as a glazed window. It is observed that the In 2 O 3 /ZnO (5 wt %) multifold composite film experienced better transmittance and thermal performance compared to its other wt % composite samples. Moreover, the multifold composite-coated glass integrated into a prototype glazed window was further investigated for its thermal performance, where a steady average indoor temperature of ∼30 °C was achieved when the outside temperature reached ∼55 °C, while maintaining good visibility. Interestingly, the transparency reached ∼86% at 60 °C and exhibited a hydrophobic water contact angle (WCA) of ∼138°. In contrast, a similar film exhibits ∼64% transparency at 22 °C, where the WCA becomes moderately hydrophilic (∼68°). Temperature dependency on transparency and wettability properties was examined for up to 60 cycles, resulting in excellent indoor thermal comfort. In addition, a thermal simulation study was executed for the smart multifold glazing composite. Moreover, this study offers dynamic glazing development options for energy saving in the smart built environment.

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A review of transparent-reflective switchable glass technologies for building facades

Cited by 55 publications

References 84 publications

Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Electrical Switching of Nematic Plasmonic Nanocolloids for Infrared Solar Gain Control

Synergistic Effect of Paraffin-Incorporated In₂O₃/ZnO Multifold Smart Glazing Composite for the Self-Cleaning and Energy-Saving Built Environment

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A review of transparent-reflective switchable glass technologies for building facades

Cited by 55 publications

References 84 publications

Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Analysing the existing dynamic insulation technologies focusing on buildings’ renovation – A review

Electrical Switching of Nematic Plasmonic Nanocolloids for Infrared Solar Gain Control

Synergistic Effect of Paraffin-Incorporated In2O3/ZnO Multifold Smart Glazing Composite for the Self-Cleaning and Energy-Saving Built Environment

Contact Info

Product

Resources

About

Synergistic Effect of Paraffin-Incorporated In₂O₃/ZnO Multifold Smart Glazing Composite for the Self-Cleaning and Energy-Saving Built Environment