Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Zhou, Yang; Wang, Shancheng; Peng, Jinqing; Tan, Yutong; Li, Chuanchang; Boey, Freddy Yin Chiang; Yi, Long

doi:10.1016/j.joule.2020.09.001

Cited by 261 publications

(197 citation statements)

References 63 publications

(66 reference statements)

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“…paraffin wax, salt hydrates) can provide extra benefits such as load shifting and peak reduction via TES in building envelopes. Many prior experiments showed that the inclusion of PCM in a double glazing or triple glazing unit (DGU or TGU, sometimes referred as double or triple pane window, DPW, TPW) can effectively reduce the interior temperature fluctuation and undesirable heat exchange through the window [26], [27]. However, two issues remain unsolved in the development of such TES with PCM in glazing units.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of solid-solid translucent phase change materials in building windows

et al. 2021

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Thermal energy storage and solar radiation management are crucial to improve the sustainability and energy efficiency of buildings. Compared with the implementation of phase change materials (PCMs) in opaque components, the energy saving potential of incorporating PCMs in transparent glazing windows is much less studied and not well understood. Here we present a comprehensive parametric study of novel PCM windows for building energy saving with a focus on optimizing and quantitatively distinguishing the contributions from the optical and thermal properties of the PCM, which is particularly useful for the design of solid-solid PCM windows. We investigate a reference commercial office building using EnergyPlus by developing an equivalent model of our PCM window that is compatible with EnergyPlus's modeling capabilities. Compared with a clearclear double-pane window, the integration of 3 mm solid-solid PCMs with optimal properties in warm, mixed, and cold climates can respectively save up to 17.2%, 14.0%, and 5.8% energy for the HVAC (heating, ventilation, and air conditioning) system, and 9.4%, 6.7%, and 3.2% energy for the whole building. We also demonstrate that these energy savings are most sensitive to the solar absorptance of PCMs for all three climates. The optimal transition temperature varies with climate and is related to the climate and solar radiation heat gain. Other issues are also briefly discussed, such as hysteresis, window orientations, and the effect of interior lighting. Although the optimal PCM windows show energy saving performance comparable with low-emissivity windows, the PCM windows provide a unique advantage in terms of shifting HVAC loads which can provide benefits to the electrical grid. Nomenclature Notations Abbreviations/subscripts Thickness (m) CondFD Conduction finite difference Area (m 2 ) WWR Window-to-wall ratio

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Section: Introductionmentioning

confidence: 99%

Parametric study of solid-solid translucent phase change materials in building windows

et al. 2021

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“…Thermal energy, one of the most primitive yet essential kinds of energy, plays a vital role in the evolution course of our civilization. From the wild age to the modern era, human beings have gained increasingly efficient and precise mastery to thermal energy ( Wang et al., 2020 ; Lyu et al., 2019 ; Shchukina et al., 2018 ; Zhou et al., 2016 , 2020 ). However, for millions of years, no one has witnessed thermal energy without the assistance of professional apparatuses.…”

Section: Introductionmentioning

confidence: 99%

Visualizing thermal distribution through hydrogel confined ionic system

Gui

et al. 2021

iScience

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Effective thermal regulation has shown great impacts on tremendous aspects of our life and manufacture. However, the invisible nature of thermal field brings us inconvenience or even security hazard. Herein, we present a method to visualize thermal distribution with the aid of a thermally active material. An ionic liquid with lower critical solution temperature is mixed within hydrogel to demonstrate a hydrogel confined ionic system (HCIS). This particular system turns turbid as the temperature exceeds an established temperature threshold, which is adjustable through applying different concentrations of HCl or NaCl. The system offers straightforward images of the spatial thermal distribution whether simple or sophisticated, which is fully in line with computational simulation. The system is further demonstrated with great promise for the application in fire warning to lower the threat induced by electrical failure. The HCIS opens a practical avenue to visualize thermal distribution and improve our thermal regulation efficiency.

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“…The MIT happens within 1 ps [3], accompanied by an abrupt electrical resistance change of approximately five orders of magnitude [4]. As well as changes of structure and electrical properties, the abrupt optical modulation in the wavelength of infrared [5], terahertz [6], and microwave [7] during MIT gives VO2 great potential for applications such as thermochromic smart windows [8], 3D-printed smart window [9], optical switching devices [10], light modulator [11], and infrared stealth [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Monoclinic Vanadium Dioxide via One-Pot Hydrothermal Route

Liu

et al. 2021

Colloids and Interfaces

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Pure monoclinic vanadium dioxide nanoparticles (VO2 NPs) with a controlled uniform size are considered essential for the preparation of thermochromic smart window coatings on desired substrates. Herein, we report a facile one-step hydrothermal synthesis of VO2(M) NPs without post-treatment of annealing, which may induce unwanted aggregation of NPs. In contrast with the annealed sample, the one-step processed VO2(M) NPs exhibit superior thermochromic performance with the solar modulation efficiency of 11.8% and luminous transmittance of 37.3%.

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Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Cited by 261 publications

References 63 publications

Parametric study of solid-solid translucent phase change materials in building windows

Parametric study of solid-solid translucent phase change materials in building windows

Visualizing thermal distribution through hydrogel confined ionic system

Synthesis of Monoclinic Vanadium Dioxide via One-Pot Hydrothermal Route

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