scholarly journals Design, Fabrication, and Characterization of Thermal and Optical Properties of Nano-Composite Self-Cleaning Smart Window

2021 ◽  
Author(s):  
Mehdi Jafari Vardanjani ◽  
Mehdi Karevan
Keyword(s):  
Optical Properties ◽  
Energy Consumption ◽  
Light Transmission ◽  
Smart Window ◽  
Smart Windows ◽  
Smart Glasses ◽  
Present Design ◽  
Injection Mechanism ◽  
Fabrication And Characterization

Abstract Polymer-based smart windows have recently received attention due to their capabilities in energy consumption reduction. A smart window provides desired optical properties when heated/cooled by using solar energy when the ambient temperature requires regulation. The main issue here is the design and fabrication of such a smart element which is the main axis of the current research. The window in the proposed design operates in such a way that the percentage of light transmission depends on the presence of nanofluid between the two walls and refractive index conformity between the fluid and the polymeric walls; Therefore the percentage of light transmission will be at its minimum value (45%) in the absence of fluid and it will be at the maximum value (80%) at the presence of fluid. The fundamental steps of the present design includes design, fabrication, and characterization of the materials. In this regard experiments to determine the mechanical, physical, structural, optical, and thermal properties of components have been performed after considering, designing, and manufacturing various samples. The results show that the proposed smart offers acceptable performance with a fast switching rate and even more than other similar smart glasses due to the usage of discharge/injection mechanism. In overall, the product can be used as a smart transparent element in various structures such as buildings and even vehicles to regulate energy consumption and/or block the view for security purposes.

scholarly journals Preparation and Properties of Thermoresponsive P(N-Isopropylacrylamide-co-butylacrylate) Hydrogel Materials for Smart Windows

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jae-Hyung Park ◽  
Ji-Won Jang ◽  
Jae-Hak Sim ◽  
Il-Jin Kim ◽  
Dong-Jin Lee ◽  
...  
Keyword(s):  
Light Transmission ◽  
Crosslinking Agent ◽  
Three Dimensional ◽  
Light Transmittance ◽  
Solar Light ◽  
Solution Temperature ◽  
Smart Window ◽  
Thermoresponsive Polymers ◽  
Smart Windows ◽  
Hydrogel Films

Thermoresponsive polymers that exhibit phase transition in response to temperature change can be used as material for smart windows because they can control solar light transmission depending on the outside temperature. The development of thermoresponsive polymers for a smart window that can be used over a wide temperature range is required. Therefore, to obtain smart window materials that can be used at various temperatures, three-dimensional thermoresponsive P(NIPAm-co-BA) hydrogels were prepared by free radical polymerization from main monomer N-isopropylacrylamide, comonomer butyl acrylate, and crosslinking agent N,N′-methylenebisacrylamide (MBAm) in this study. This study examined the effect of BA content on the lower critical solution temperature (LCST) and the solar light transmittance of crosslinked P(NIPAm-co-BA) hydrogel films. The LCST of hydrogel films was found to be significantly decreased from 34.3 to 29.5°C with increasing BA content from 0 to 20 mol%. It was found that the transparent films at T=25°C (T<LCST) were converted to translucent films at a higher temperature (T=45°C) (T>LCST). These results suggested that the crosslinked P(NIPAm-co-BA) hydrogel materials prepared in this study could have high potential for application in smart window materials.

scholarly journals Smart Electrochromic Windows to Enhance Building Energy Efficiency and Visual Comfort

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1449 ◽  
Author(s):  
Alessandro Cannavale ◽  
Ubaldo Ayr ◽  
Francesco Fiorito ◽  
Francesco Martellotta
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Relevant Literature ◽  
Management Strategies ◽  
Building Energy Efficiency ◽  
Visual Comfort ◽  
Confined Space ◽  
Smart Window ◽  
Smart Windows ◽  
The One

Electrochromic systems for smart windows make it possible to enhance energy efficiency in the construction sector, in both residential and tertiary buildings. The dynamic modulation of the spectral properties of a glazing, within the visible and infrared ranges of wavelengths, allows one to adapt the thermal and optical behavior of a glazing to the everchanging conditions of the environment in which the building is located. This allows appropriate control of the penetration of solar radiation within the building. The consequent advantages are manifold and are still being explored in the scientific literature. On the one hand, the reduction in energy consumption for summer air conditioning (and artificial lighting, too) becomes significant, especially in "cooling dominated" climates, reaching high percentages of saving, compared to common transparent windows; on the other hand, the continuous adaptation of the optical properties of the glass to the changing external conditions makes it possible to set suitable management strategies for the smart window, in order to offer optimal conditions to take advantage of daylight within the confined space. This review aims at a critical review of the relevant literature concerning the benefits obtainable in terms of energy consumption and visual comfort, starting from a survey of the main architectures of the devices available today.

scholarly journals Gallium phosphide optical metasurfaces for visible light applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mauro Melli ◽  
Melanie West ◽  
Steven Hickman ◽  
Scott Dhuey ◽  
Dianmin Lin ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Visible Light ◽  
Material Properties ◽  
Gallium Phosphide ◽  
Material Selection ◽  
Viable Alternative ◽  
Fabrication And Characterization ◽  
Selection For

AbstractThere are few materials that are broadly used for fabricating optical metasurfaces for visible light applications. Gallium phosphide (GaP) is a material that, due to its optical properties, has the potential to become a primary choice but due to the difficulties in fabrication, GaP thin films deposited on transparent substrates have never been exploited. In this article we report the design, fabrication, and characterization of three different amorphous GaP metasurfaces obtained through sputtering. Although the material properties can be further optimized, our results show the potential of this material for visible applications making it a viable alternative in the material selection for optical metasurfaces.

Design, Fabrication and Characterization of Subfield Addressing in Micromirror Arrays for Smart Window Applications

2019 ◽  
Author(s):  
Mustaqim Siddi Que Iskhandar ◽  
Huanping Luo ◽  
Krishna Ananda Ekaputera ◽  
Basim Al-Qargholi ◽  
Muhammad Mohsin Khan ◽  
...  
Keyword(s):  
Smart Window ◽  
Fabrication And Characterization ◽  
Micromirror Arrays ◽  
Window Applications

scholarly journals Fabrication and characterization of Cs2SnI6 perovskite films using SnI2 and I2 powders as reactants

2021 ◽  
Author(s):  
Saad Ullah ◽  
Peixin Yang ◽  
Ghulam Abbas ◽  
Yongsheng Chen
Keyword(s):  
Optical Properties ◽  
Phase Stability ◽  
Double Perovskite ◽  
Photovoltaic Devices ◽  
Reaction Conditions ◽  
Step Process ◽  
Fabrication And Characterization ◽  
The Impact ◽  
Exceptional Stability

Abstract In the recent years, cesium tin iodide (Cs2SnI6) double perovskite has emerged as a research hotspot in photovoltaics due to its exceptional stability and outstanding optoelectronic properties. In this work, we have utilized a reactant combination of SnI2 and I2 to prepare uniform Cs2SnI6 films via modified two-step process. The impact of the reaction conditions on the structural, morphological and optical properties is explored. It is found that optimizing the reaction conditions improves the phase stability and morphology of the films. The iodine-rich fabrication of the films ensued in enhanced PL and optical characteristics of the Cs2SnI6 with an optimal bandgap in the range of 1.21-1.34 eV. Additionally, we constructed all-inorganic photovoltaic devices FTO/TiO2/Cs2SnI6/Carbon utilizing optimized Cs2SnI6 films.

scholarly journals Energy Consumption Verification of SPD Smart Window, Controllable According to Solar Radiation in South Korea

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5643
Author(s):  
Yujin Ko ◽  
Hyogeun Oh ◽  
Hiki Hong ◽  
Joonki Min
Keyword(s):  
Energy Consumption ◽  
Suspended Particle ◽  
Electricity Consumption ◽  
Energy Requirements ◽  
Weather Data ◽  
Smart Window ◽  
Smart Windows ◽  
Reduce Energy Consumption ◽  
The City ◽  
Made In

Between 60% and 70% of the total energy load of a house or office occurs through the exteriors of the building, and in the case of offices, heat loss from windows and doors can approach 40%. A need for glass that can artificially control the transmittance of visible light has therefore emerged. Smart windows with suspended particle device (SPD) film can reduce energy consumption by responding to environmental conditions. To measure the effect of SPD windows on the energy requirements for cooling and heating in Korea, we installed a testbed with SPD windows. With TRNSYS18, the comparison between measurements and simulation has been made in order to validate the simulation model with respect to the modeling of an SPD window. Furthermore, the energy requirements of conventional and SPD-applied windows were compared and analyzed for a standard building that represented an actual office building. When weather for the city of Anseong and a two-speed heat pump were used to verify the simulation, the simulated electricity consumption error compared with the testbed was −1.0% for cooling and −0.9% for heating. The annual electricity consumption error was −0.9%. When TMY2 Seoul weather data were applied to the reference building, the decrease in electricity consumption for cooling in the SPD model compared with the non-SPD model was 29.1% and the increase for heating was 15.8%. Annual electricity consumption decreased by 4.1%.

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