Simulation study for a switchable adaptive polymer dispersed liquid crystal smart window for two climate zones (Riyadh and London)

Hemaida, Abdulmohsin; Ghosh, Aritra; Sundaram, Senthilarasu

doi:10.1016/j.enbuild.2021.111381

Cited by 40 publications

(7 citation statements)

References 55 publications

(59 reference statements)

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“…These results agree with those recorded by the authors of [26], who conducted PDLC spectrum analysis and found that solar transmittance was reduced by 15.8% in the coloured state compared with the transparent state. Furthermore, our results agree with those reported by the authors of [24], where the coloured state of PDLC achieved an annual energy reduction of 12.8% in the hot arid climate of Riyadh, Saudi Arabia. By contrast, the result found by the authors of [22] concludes that coloured-PDLC applied to single glazing increased heat gain compared with its transparent state.…”

supporting

confidence: 93%

“…Several studies have been conducted in relation to window glazings with a PDLC film. Hemaida et al [24] investigated the effect of PDLC windows on the overall office building energy performance utilising a simulation program under two contrasting climate zones: an arid climate (Riyadh, Saudi Arabia) and a temperate climate (London, United Kingdom). They concluded that the PDLC window was more effective with a cooling reduction of 12.8% (arid climate) than a heating reduction of 4.9% (temperate climate).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Evaluation of Thermal and Lighting Performance Using Double Dynamic Insulated Glazing

Qahtan

Almawgani

2022

Buildings

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Designing windows in hot climates that allow occupants to easily control their preferences in a smart home is of considerable importance. This paper aims to contribute to this topic by examining the potential of a smart window system that has double dynamic insulated glazing (DDIG) in preventing heat gain and maximising daylight indoors, considering smart privacy protection during both the day and the night. A small-scale model was developed to examine the proposed window system. Test cell temperature, glass surface temperature and indoor illumination lux were investigated. The results showed that the DDIG had high solar heat control inside the test cell, with a significant reduction of 2.5 °C compared with the common glazing of translucent glass used in Najran City, Saudi Arabia. At high solar irradiation intensities, no significant differences in controlling the heat gain to the test cell were found between coloured DDIG (DDIG-colo) and transparent DDIG (DDIG-trans). A graded reduction between DDIG-trans and DDIG-colo was found with decreasing solar intensity, which was found to be 15%, 10% and 8.7% at irradiation intensities of 200, 400 and 600 W/m2, respectively. The DDIG transparencies maintained the illumination lux with higher reduction under low solar irradiation. The DDIG also provided privacy protection and granted user preferences for outdoor connections.

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supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Thermal and Lighting Performance Using Double Dynamic Insulated Glazing

Qahtan

Almawgani

2022

Buildings

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“…As a typical liquid crystal-based optical film, polymer-dispersed liquid crystal (PDLC) consists of a polymer substrate with embedded micrometer- or nanometer-sized liquid crystal (LC) microdroplets [ 1 ]. PDLC films exhibit an opaque state under unelectrified conditions due to the random orientation of LC microdroplets [ 2 ]. In turn, when a sufficiently large voltage is applied, LC microdroplets align themselves along the direction of the electric field and cause PDLCs to reach a transparent state with high transmittance [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Bilayer Polymer-Dispersed Liquid Crystals Doped with Gd2O3 Nanoparticles and Rhodamine B Base Fluorescent Dye

Wu,

Zhao,

et al. 2024

Molecules

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Using the polymerization-induced phase separation (PIPS) method, bilayer polymer-dispersed liquid crystal (PDLC) films with a PDLC-PVA-PDLC structure were prepared in this work. It was found that all PDLC performance indexes were affected by polymer mesh size after comparing the microscopic morphology and electro-optical properties of samples with different monomer ratios. Gd2O3 nanoparticles and rhodamine B base fluorescent dyes introduced into the bilayer PDLC optimized the samples’ electro-optical properties and developed new functionalities. In addition, the bilayer PDLC doped with Gd2O3 and rhodamine B base held excellent progressive driving functions as well as stable durability properties. Samples doped with Gd2O3 nanoparticles and rhodamine B base also produced excellent anti-counterfeiting effects under UV irradiation at different angles, further exploiting the application potential of PDLC.

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“…However, antireflection is not suitable for cold climates as it is essential for the reflecting solar spectrum to be transmitted through the window to enhance the room temperature [ 10 , 11 ]. Hence, there is a trend now of replacing the traditional single- and double-glazed windows with advanced technology such as smart switchable EC [ 12 ], SPD [ 13 , 14 , 15 , 16 ], PDLC [ 17 ], thermally activated PCM [ 18 ], hydrogel [ 19 , 20 ], aerogel [ 21 ] or vacuum [ 22 , 23 ] filled windows.…”

Section: Introductionmentioning

confidence: 99%

Comfort Analysis of Hafnium (Hf) Doped ZnO Coated Self-Cleaning Glazing for Energy-Efficient Fenestration Application

et al. 2022

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To attain a comfortable building interior, building windows play a crucial role. Because of the transparent nature of the window, it allows heat loss and gain and daylight. Thus, they are one of the most crucial parts of the building envelope that have a significant contribution to the overall building energy consumption. The presence of dust particles on a window can change the entering light spectrum and creates viewing issues. Thus, self-cleaning glazing is now one of the most interesting research topics. However, aside from the self-cleaning properties, there are other properties that are nominated as glazing factors and are imperative for considering self-cleaning glazing materials. In this work, for the first time, Hf-doped ZnO was investigated as self-cleaning glazing and its glazing factors were evaluated. These outcomes show that the various percentages of ZnO doping with Hf improved the glazing factors, making it a suitable glazing candidate for the cold-dominated climate.

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Simulation study for a switchable adaptive polymer dispersed liquid crystal smart window for two climate zones (Riyadh and London)

Cited by 40 publications

References 55 publications

Experimental Evaluation of Thermal and Lighting Performance Using Double Dynamic Insulated Glazing

Experimental Evaluation of Thermal and Lighting Performance Using Double Dynamic Insulated Glazing

Preparation and Characterization of Bilayer Polymer-Dispersed Liquid Crystals Doped with Gd2O3 Nanoparticles and Rhodamine B Base Fluorescent Dye

Comfort Analysis of Hafnium (Hf) Doped ZnO Coated Self-Cleaning Glazing for Energy-Efficient Fenestration Application

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