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Multi-objective optimization of thermochromic glazing based on daylight and energy performance evaluation

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Building Simulation 2021年第6期14卷 1685-1695页

作者： Xiaoqiang Hong Feng Shi Shaosen Wang Xuan Yang Yue Yang School of Architecture and Civil Engineering Xiamen UniversityXiamen361005China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China

Many efforts have been detected to investigate thermochromic(TC)glazing for improving building energy saving,while only a few approaches for daylight performance *** this study,the performance of TC glazing is investigated based on multi-objective optimization for minimizing energy demand while maximizing daylight *** effects of five parameters including transition temperature,solar transmittance in clear state,solar transmittance modulation ability,luminous transmittance in clear state,and luminous modulation ability on the building energy consumption and useful daylighting illuminance(UDI_(300-3000))are *** Programming Technique for Multi-dimensional Analysis of Preference(LINMAP)is used for the decision-making of Pareto *** research aims to explore the ideal thermochromic glazing by considering the daylight and energy performance of a typical office room,taking the weather condition of Xiamen,China as an *** it is impossible to achieve both optimal values of energy consumption and UDI_(300-3000)simultaneously,the proposed multi-objective optimization method could still provide low energy consumption with sufficient *** non-dominated sorting of Pareto optimal solution(POS)demonstrated that the optimum building energy consumption and UDI_(300-3000)for single glazed windows are 46.64 kWh/m^(2)and 70.92%,respectively,while the values for double glazed windows are 44.40 kWh/m^(2)and 71.88%,*** selected hypothetical TC windows can improve the building energy and daylighting performance simultaneously when compared with traditional clear single and double glazed *** presented framework provides a multi-objective optimization method to determine the most suitable TC glazing technologies for designers and architects during the design and retrofit procedure.

关键词： thermochromic transition temperature daylighting building energy performance multi-objective optimization

A Robust Superhydrophobic Smart Coating with Reversible thermochromic and Photochromic Property

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Journal of Bionic Engineering 2022年第6期19卷 1589-1600页

作者： Peng Wang Xuesong Zhang Zhihao Wang Tao Chen Honglian Zhang Wei Duan Huilong Han School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding071000China Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention North China Electric Power UniversityBaoding071003China

Both thermochromic and photochromic coating have attracted many attentions due to their widely applications,but the low stability is a big *** by the lotus leaf,to endow the chromic coating with superhydrophobicity is a possible *** this research,a dual response coating was prepared by adding photochromic and thermochromic particles *** prepared sample demonstrated at least four-state color switching,which can be successfully used in tactile imaging,multi-color fabric,erasable record,and security *** superhydrophobicity was achieved by introducing vinyl-terminated polydimethylsiloxane,which not only offers low surface energy but also can cross-link with the particles to increase the ***,the prepared sample maintained superhydrophobicity after various kinds of destruction(such as sandpaper abrasion,corrosive liquid attack,ultrasonic treatment,UV irradiation,and high-speed drops/turbulent jets impact).Even though the superhydrophobicity can be destroyed by plasma etching,it can be recovered after 12 h at room temperature.

关键词： Bionic coating Superhydrophobic thermochromic Photochromic Robust

Lead-free thermochromic perovskites with tunable transition temperatures for smart window applications

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Science China Chemistry 2019年第9期62卷 1257-1262页

作者： Jingwen Li Xiaolong Liu Peixin Cui Junmeng Li Tao Ye Xi Wang Chuang Zhang Yong Sheng Zhao Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Science Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Soil Science Chinese Academy of Sciences Nanjing 210000 China Department of Physics School of Science Beijing Jiaotong University Beijing 100044 China

The structural flexibility of hybrid perovskite materials allows for phase transition and consequently thermochromic *** we investigate the thermochromic performance in a series of copper-based layered perovskites with organic cations having different alky chain lengths. Their transition temperature is found to be dependent on the organic cations due to molecular motion and hydrogen bond interaction, providing possibilities to prepare thermochromic semiconductors near room temperature for smart window applications.

关键词： lead-free perovskites thermochromic transition alkyl ammonium ions layered structures smart windows

A thermochromic, Viscoelastic Nacre-like Nanocomposite for the Smart Thermal Management of Planar Electronics

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Nano-Micro Letters 2023年第10期15卷 182-196页

作者： Jiemin Wang Tairan Yang Zequn Wang Xuhui Sun Meng An Dan Liu Changsheng Zhao Gang Zhang Weiwei Lei College of Biomedical Engineering Sichuan UniversityChengdu 610064People’s Republic of China Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000GeelongVictoria 3220Australia College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021People’s Republic of China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065People’s Republic of China Institute of High Performance Computing A*STAR Singapore 138632Singapore

Cutting-edge heat spreaders for soft and planar electronics require not only high thermal conductivity and a certain degree of flexibility but also remarkable self-adhesion without thermal interface materials, elasticity, arbitrary elongation along with soft devices, and smart properties involving thermal self-healing, thermochromism and so on. Nacre-like composites with excellent in-plane heat dissipation are ideal as heat spreaders for thin and planar electronics. However, the intrinsically poor viscoelasticity, i.e., adhesion and elasticity, prevents them from simultaneous self-adhesion and arbitrary elongation along with current flexible devices as well as incurring high interfacial thermal impedance. In this paper, we propose a soft thermochromic composite(STC) membrane with a layered structure, considerable stretchability, high in-plane thermal conductivity(~30 Wm^(-1) K^(-1)), low thermal contact resistance(~12 mm^2 KW^(-1), 4–5 times lower than that of silver paste), strong yet sustainable adhesion forces(~4607 Jm^(-2), 2220 Jm^(-2) greater than that of epoxy paste) and self-healing efficiency. As a self-adhesive heat spreader, it implements efficient cooling of various soft electronics with a temperature drop of 20℃ than the polyimide case. In addition to its self-healing function, the chameleon-like behavior of STC facilitates temperature monitoring by the naked eye, hence enabling smart thermal management.

关键词： Boron nitride nanosheets Nacre-inspired composites Viscoelastic thermochromic Smart thermal management

Visible Light Photocatalytic Properties and thermochromic Phenomena of Nanostructured BiOCl Microspheres

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Journal of Materials Science & Technology 2014年第11期30卷 1130-1133页

作者： Jiushan Cheng Cong Wang Yinfang Cui Ying Sun Ying Zuo Center for Condensed Matter and Material Physics Department of PhysicsBeihang University

Black nanostructured BiOCI microspheres were directly synthesized by a hydrothermal method. The black ball- like BiOCI microspheres and black flower-like BiOCI microspheres were obtained using different surfactant. The color of the BiOCI microspheres turned from black to white when being annealed at 400 ℃ in air for 3 h and could be recovered to black by exposure to ultraviolet light for a few hours. The photocatalytic activity of both the black and the white BiOCI microspheres was characterized by the photo-degradation of methyl orange dye under visible light irradiation. The black ball-like nanostructure BiOCI displayed the best photocatalytic activity, compared with the white BiOCI and the black flower-like BiOCI. It can degrade the methyl orange dye to 20% within 70 min under visible light irradiation. The high activity of the BiOCI ball-like sphere may own to its special morphology, strong absorption in visible light range and the existence of oxygen vacancies.

关键词： Photocatalysis Black BiOCI Microsphere thermochromic

Synthesis, thermochromic Properties and Thermal Behavior of some Schiff *** I. p,p'-Diaminodiphenylmethane-Schiff Bases and Sulphonamide Schiff Base

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Chinese Chemical Letters 2001年第8期12卷 687-690页

作者： Chuan Fang ZHU Han Hong XU Sang Jun YANG Department of Chemistry Central China Normal UniversityWuhan 430079

p,p'-Diaminodiphenylmethane-Schiff bases (SB) of general formula (R)-phCH=N- ph-CH2-ph-N=CHph(R), where R is p-NO2, m-NO2, p-OH, o-OH, p-Cl, -H, p-OCH3, and sul- phonamide Schiff bases (SB) of general formula (R)-phCH=N-ph-SO2NH2, where R is p-NO2, m-NO2, p-OH, o-OH, p-Cl, -H, p-OCH3, were synthesized and their structure have been characterized by the melting pointing, 1HNMR, MS, and elemental analysis. They are thermolabile and undergo thermo-chromism and thermal decomposition after melting. The TG. and DSC measurement were recorded in dynamic air and interpreted.

关键词： p p’-Diaminodiphenylmethane Schiff bases thermochromic sulphonamide.

Improved thermochromic and photocatalytic activities of F-VO_(2)/ Nb-TiO_(2) multifunctional coating films

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Tungsten 2019年第4期1卷 306-317页

作者： Anung Riapanitra Yusuke Asakura Shu Yin Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980‑8577Japan

Multifunctional photocatalytic and thermochromic composites consisting of fluorine-doped vanadium dioxide(F-VO_(2))and niobium-doped TiO_(2)(NTO)were prepared by a simple physical *** composites exhibited a higher thermochromic activity and nitrogen oxide(NO_(x))decomposition activity than that of pristine VO_(2)/*** VO_(2) and NTO materials were synthesized using an environmentally friendly soft chemical solvothermal/hydrothermal process,which produced NTO nanoparticles with a controllable morphology and particle size by changing the ratio of ethanol and acetic acid sol-vent.F-VO_(2)/NTO showed a better multifunctionality of thermochromic and photocatalytic activities than those of VO_(2)/NTO *** coexistence coating films showed a better effect on thermochromic and deNO_(x)(NO_(x) reduction)activity than those of double-sided films for F-VO_(2)/NTO *** best thermochromic and photocatalytic activities obtained from sample F-VO_(2)/NTO 60 showed the ΔT_(1500 nm)[difference of transmittance(ΔT)at the wavelength of 1500 nm under 25°C and 95°C]of up to 29.5%and deNO_(x) activity of up to 40%at λ>290 nm under mercury lamp *** use of F-VO_(2)/NTO coexistence coating films showed the appropriateness for multifunctional materials.

关键词： Nb-doped TiO_(2) VO_(2)(M) thermochromic Photocatalytic NO_(x)decomposition Multifunctional coating

Thin film design for advanced thermochromic smart radiator devices

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Chinese Physics B 2007年第6期16卷 1704-1709页

作者：冯煜东王志民马亚莉张福甲 Physics Department Lanzhou University Lanzhou 730000 China National Key Laboratory of Surface Engineering Lanzhou Institute of Physics Lanzhou 730000 China National Key Laboratory of Vacuum and Cryogenics Technology Lanzhou Institute of Physics Lanzhou 730000 China

This paper describes the research on the materials and design methods for advanced smart radiator devices （SRDs） on large-area flexible substrates utilized on spacecraft. The functional material is thermochromic vanadium dioxide. The coating design of SRD is similar to the design of broadband filter coatings in a mid-infrared region. The multilayer coatings have complex structures. Coating materials must be highly transparent in a required spectrum region and also mechanically robust enough to endure the influence from the rigorous environments of outer space. The number of layers must be very small, suitable for the deposition on large-area flexible substrates. All the coatings are designed initially based on optical calculation and practical experience, and then optimized by the TFCALC software. Several designs are described and compared with each other. The results show that the emittance variability of the designed SRDs is great than 400%, more advanced than the reported ones.

关键词： optical design thermochromic vanadium dioxide smart radiator device

The Effect of Transition Hysteresis Width in thermochromic Glazing Systems

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Open Journal of Energy Efficiency 2013年第2期2卷 75-88页

作者： Michael E. A. Warwick Ian Ridley Russell Binions Department of Chemistry University College London Christopher Ingold Laboratories London UK School of Engineering and Materials Science Queen Mary University of London London UK School of Property Construction and Project Management RMIT University Melbourne Australia

thermochromic glazing theoretically has the potential to lead to a large reduction in energy demand in modern buildings by allowing the transmission of visible light for day lighting whilst reducing unwanted solar gain during the cooling season, but allowing useful solar gain in the heating season. In this study building simulation is used to examine the effect of the thermochromic transition hysteresis width on the energy demand characteristics of a model system in a variety of climates. The results are also compared against current industry standard glazing products. The results suggest that in a warm climate with a low transition temperature and hysteresis width energy demand can be reduced by up to 54% compared to standard double glazing.

关键词： Energy Simulation Energy Demand Reduction thermochromic Glazing