Synergistic modulation of solar and thermal radiation in dynamic energy-efficient windows

Zhou, Zhengui; Fang, Yunsheng; Wang, Xin; Yang, Erqi; Liu, Rong; Zhou, Xishu; Huang, Zhen; Yin, Hongbiao; Zhou, Jun; Hu, Bin

doi:10.1016/j.nanoen.2021.106865

Cited by 33 publications

(22 citation statements)

References 39 publications

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“…Regarding the transparent components, the external triggers (e.g., thermal and electrical) that activate the thermal emissivity modulation can also activate the modulation of solar transmittance. [23][24][25] For instance, the mechanical-driven window for regulating the thermal radiation always results in opaque/transparent appearance under stretched/released stress. [25] Thus, these transparent components are not reviewed in this category and they will be reviewed in the following Section 4.2.…”

Section: Thermal Radiation Modulationmentioning

confidence: 99%

“…One is to generate cracks and wrinkles on the surface of the window. [24,25,154] For instance, Zhou et al [24] fabricated a mechanical-driven window with sequence photonic structures that can synergistically modulate both solar and thermal radiation. In its original/released state, the window can allow solar transmission and suppress radiative heat loss for warming purpose.…”

Section: Mechanical-driven Materialsmentioning

confidence: 99%

mentioning

confidence: 99%

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Solar and Thermal Radiation‐Modulation Materials for Building Applications

Chai

Fan

2022

Advanced Energy Materials

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the building envelope, which mainly consists of transparent and opaque components. For transparent components (e.g., window), the STRMMs should have high transparency of visible light (0.38-0.76 µm) under both hot and cold ambient conditions to guarantee natural lighting. Nearinfrared (NIR) light (0.77-2.5 µm), which accounts for 52% of solar heat, [9] should be reflected in summer for cooling purpose but be transmitted into room in winter to induce solar heat gains. For opaque components (e.g., wall), the STRMMs should have high reflectance of both visible and NIR lights in summer but low reflectance of both lights in winter. Meanwhile, as both transparent and opaque components continuously emit thermal radiation into the outdoor ambient, the STRMMs should have low infrared thermal emissivity in winter to suppress radiative heat loss but high infrared thermal emissivity in summer to accelerate radiative heat dissipation. Figure 1b shows the ideal optical properties of STRMMs applied on transparent and opaque components in both heating and cooling modes. Existing reviews mainly focused on the daytime radiative cooling materials with fixed solar reflectance and thermal emissivity, [10][11][12] which only helps reduce building cooling loads in summer but inevitably increases building heating loads in winter, leading to limited building energy savings. Recently, owing to the rapid development of material science, the STRMMs have been widely explored, which can dynamically modulate the optical properties under external triggers (e.g., thermo and electrical) to accommodate the heating/cooling needs of building in different seasons, showing improved building energy-saving potentials. [13][14][15][16][17] Although there are reviews reporting the materials with modulating optical properties, [15,18] they merely focused on either solar or thermal radiation modulation, which provide limited or even negative building energy savings, which may mislead the researchers to design low energy-efficient materials in practice. For instance, the thermochromic (TC) window can achieve low solar transmittance in hot season but high solar transmittance in cold season. [13,19] Nonetheless, it maintains high thermal emissivity (above 90%) in both seasons. This would accelerate heat loss of building in cold season, and result in limited energy savings. The vanadium dioxide (VO 2 )-based Fabry-Perot (FP) resonator can achieve low thermal emissivity in cold season but high thermal emissivity in hot season, while it maintains constant solar absorptance (25%) in both seasons. This would induce much more solar heating than the conventional cooling materials with smaller solar absorptance (10%), resulting in Regulation of solar and thermal radiation of building envelope shows huge energy-saving potentials. Existing reviews mainly focus on the materials with fixed solar and thermal optical properties. Although there are reviews reporting the materials with modulated optical properties (e.g., radiative cooling materials with modulating thermal emi...

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Section: Thermal Radiation Modulationmentioning

confidence: 99%

Section: Mechanical-driven Materialsmentioning

confidence: 99%

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Solar and Thermal Radiation‐Modulation Materials for Building Applications

Chai

Fan

2022

Advanced Energy Materials

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“…Stimuli-responsive switchable hybrid perovskite materials display reversible color changes, fluorescence, phase transition, or other physical properties under external stimulations, including temperature, light, pressure, and electricity, and play an important role in energy-saving and environmental protection. − Besides, these materials also have great potential for applications in smart windows, storage devices, sensors, optoelectronic devices, switch operations, and so on. − Among them, thermochromic hybrid perovskites, possessing the interesting stimulation response of color change under varying temperatures, have emerged as good candidates due to their wide applications in smart temperature coatings, colored clothing, smart stealth materials, and temperature sensors. − Generally, thermochromism, caused by phase transition or vibronic coupling, is a notable color-change phenomenon and is often present in Cu-based and Pb-based hybrid perovskites. − More glaringly, compared with the high toxicity of Pb-based perovskites, Cu-based perovskites are excellent candidates for thermochromic materials. The 2D [CuX 4 ] 2– layers were separated by the organic cations in 2D OIHPs. , As a result of the Jahn–Teller effect, two of the six Cu–X bonds are longer than the others combining with the distorted [CuX 4 ] 2– layer, which result in additional flexibility of the inorganic framework .…”

Section: Introductionmentioning

confidence: 99%

Switchable Dielectric Two-Dimensional Lead-Free Perovskite with Reversible Thermochromic Response

Zhang

et al. 2022

J. Phys. Chem. C

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Two-dimensional (2D) organic–inorganic hybrid perovskites (OIHPs) have attracted great interest due to their unique properties for optical, thermal, electric, force, and magnetic applications. However, although some 2D HOIPs with thermochromic properties have been obtained, the issue of toxicity of lead and single-stimulus response impose restrictions on their further applications. To overcome this limitation, we scientifically design and fabricate a novel two-dimensional organic–inorganic hybrid lead-free perovskite [2,5-DCA]2·[CuCl4] (1), which simultaneously possesses excellent reversible chromic/dielectric response under thermal stimulation. Specifically, along with the change in temperature (303–413 K), crystal 1 displays a reversible color change between yellow-green and red-brown with a band gap variation from 2.25 to 2.05 eV. Besides, compared with other thermochromic perovskites, crystal 1 also exhibits a sensitive dielectric transition at a lower phase-transition point (around 369 K) with high fatigue resistance. This study demonstrates a reliable strategy for the fabrication of multiple-stimuli-responsive materials and sheds light on the study of two-dimensional lead-free perovskites in smart windows.

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“…The problems of resource shortage and environmental pollution have become more and more severe in recent years. − To address this predicament, researchers have been devoting themselves to developing and utilizing various renewable and clean energy sources, such as wind energy, , water energy, , and solar energy. − Solar energy is an inexhaustible source of clean energy among the most abundant energy source and can usually be used everywhere without geographical limitation. Therefore, a reasonable and efficient application of solar energy is of great significance to relieve the energy crisis caused by the exhaustion of fossil energy. − The current research hotspots in the field of solar energy development and utilization are mainly focused on photoelectric conversion, photothermal conversion, and solar photocatalysis. − Among them, solar photothermal conversion technology has attracted much attention because of its high energy conversion efficiency, low cost, and environmental protection and has been widely used in the fields of solar thermal power generation, solar thermal effects, and seawater desalination. − …”

Section: Introductionmentioning

confidence: 99%

Elevating the Photothermal Conversion Efficiency of Phase-Change Materials Simultaneously toward Solar Energy Storage, Self-Healing, and Recyclability

Zhao

Yuan

et al. 2022

ACS Appl. Mater. Interfaces

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To alleviate the predicament of resource shortage and environmental pollution, efficiently using abundant solar energy is a great challenge. Herein, we prepared unique photothermal conversion phase-change materials, namely, CNT@PCMs, by introducing carbon nanotubes (CNTs) used as photothermal conversion materials into the recyclable matrix of phase-change materials (PCMs). These devised CNT@PCMs cleverly combine the photothermal conversion capability of CNTs and the thermal energy storage capability of traditional PCMs. Especially, the surface temperature of the prepared CNT@PCMs can be raised to 100 °C within 165 s under the solar simulator (150 mW cm −2 ), showing a surprising heating rate that is much higher than that of the reported works and achieving a higher photothermal conversion efficiency for solar energy in this work. Furthermore, these CNT@ PCMs can hold high melting latent heat with a maximum value at 110.0 J g −1 , exhibiting remarkable thermal storage ability aside from preeminent photothermal conversion capability. Intriguingly, the introduction of dynamic oxime group−carbamate bonds into the molecular structure can endow CNT@PCMs with an outstanding self-healing performance and recyclability. The broken CNT@PCMs sample can be healed in 2 min under IR-laser irradiation. Importantly, the phase-change and mechanical properties and photothermal conversion efficiency of CNT@PCMs can also remain virtually unchanged after multiple recycles. It is of great significance to design this style of CNT@PCMs for achieving the efficient utilization of solar energy and environmental protection.

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Synergistic modulation of solar and thermal radiation in dynamic energy-efficient windows

Cited by 33 publications

References 39 publications

Solar and Thermal Radiation‐Modulation Materials for Building Applications

Solar and Thermal Radiation‐Modulation Materials for Building Applications

Switchable Dielectric Two-Dimensional Lead-Free Perovskite with Reversible Thermochromic Response

Elevating the Photothermal Conversion Efficiency of Phase-Change Materials Simultaneously toward Solar Energy Storage, Self-Healing, and Recyclability

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