Simulating the natural lighting for a physical and mental Well-being in residential building in Dubai, UAE

Mahmoud, Naglaa Sami Abdelaziz; Samanoudy, Gamal El; Jung, Chuloh

doi:10.1016/j.asej.2022.101810

Cited by 16 publications

(11 citation statements)

References 65 publications

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“…Fortner et al proposed assigning approximate colors to places on the CIE diagram to indicate the hue of the emission from general illumination sources. 30 As shown in Figure 2a, the CIE coordinates of the light emitted by the white RL with different pumping energy densities are located at the same white area, confirming its feasibility of being an ideal white light source. Figure 2b shows the enlarged image of the CIE coordinates of the white RL with different pumping energy densities.…”

Section: Resultsmentioning

confidence: 60%

“…When the pumping energy density is above the threshold (290 mJ/cm 2 ), we can observe that as the pumping energy density increases, the CIE coordinates of the emitted white RL gradually shift toward the coordinates of ideal white light (0.33, 0.33). The color temperature, CCT, obtained from CIE coordinates, with a numerical number of about 3000 K, is categorized as “warm white” suitable for lighting bedrooms, living rooms, and restaurants. , …”

Section: Resultsmentioning

confidence: 99%

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Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index

Hou,

Tsui,

Chou

et al. 2024

ACS Appl. Mater. Interfaces

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The freedom from efficiency droop motivates monochromatic lasers to progress in general lighting applications due to the demand for more efficient and sustainable light sources. Still, a white light based on monochromatic lasers with high lighting quality, such as a high color rendering ability, an angle-independent output, and a speckle-free illumination, has not yet been fabricated nor demonstrated. Random lasers, with the special mechanism caused by multiple scattering, the angle-free emission, and the uncomplicated fabrication processes, inspire us to investigate the feasibility of utilizing them in general lighting. In this work, a white random laser with a high color rendering index (CRI) value, regardless of pumping energy and observing direction, was performed and discussed. We also investigated the stability of white RL as its CIE chromaticity coordinates exhibit negligible differences with increasing pump energy density, retaining its high-CRI measurement. Also, it exhibits angleindependent emission while having a high color rendering ability. After passing through a scattering film, it generated no speckles compared to the conventional laser. We demonstrated the advances in white laser illumination, showing that a white random laser is promising to be applied for high-brightness illumination, biological-friendly lighting, accurate color selections, and medical sensing.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index

Hou,

Tsui,

Chou

et al. 2024

ACS Appl. Mater. Interfaces

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“…In this regard, Sami Abdelaziz Mahmoud and colleagues found that sunlight effectively increases cognitive performance, health improvement, and mental welfare (28). Mayhoub and Rabboh pointed to the achievement of pleasant mental feelings and decreased stress due to exposure to the sun (29).…”

Section: Discussionmentioning

confidence: 99%

The Impact of Different Color Temperatures and Sources of Light on Mood and Vision: Acuity and Color Recognition

et al. 2023

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Background: Light is a physical factor that can influence the mood and vision of people during work and study. According to the importance of these physical factors, the present study aimed to investigate the effect of the source and color temperature on the mood and vision (acuity and color recognition) of students of TUMS and USWR medical universities. Methods: The present study is an applied study, and the research method is quasi-experimental. Twenty subjects were determined by first-type error (0.05) and test power (0.08). The mood was measured using the profile of mood states (POMS), visual acuity in different lighting conditions based on Snellen and FrACT methods, and color recognition by Ishihara’s test. Data were analyzed by SPSS 22, one-way ANOVA, and Greenhouse-Geisser. Results: The results of investigating six subscales of the POMS scale in sunlight, LED, and fluorescent with color temperatures of 4000 K and 3000 K indicated improvement in mood states (P < 0.001). Color recognition under different lighting conditions showed no significant difference (P < 0.05). However, visual acuity with the FrACT method under sunlight showed a significant difference in other lighting conditions (P < 0.001). Conclusions: Light sources can influence mood and vision states (acuity and color recognition) under different lighting conditions. Therefore, using sunlight in educational environments can improve the mood and state of students.

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“…The importance of designing efficient and healthy buildings, which resonates with the IAQ challenges in Dubai's residential sector, is also underscored (McGill et al, 2015). These challenges have arisen due to the deterioration of ventilation performance resulting from the recent enhancement of airtightness in buildings and the increased utilization of building materials and furniture that contain substantial amounts of chemical substances in newly constructed apartments Mahmoud et al, 2023a). The significance of ventilation efficiency in the breathing zone, especially concerning evaluating IAQ during sleep, highlights the complexities of IAQ management (Hormigos-Jimenez et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Enhancing indoor air quality and sustainable living in newly constructed apartments: insights from Dubai

Jung,

Abdelaziz Mahmoud,

Alqassimi

2023

Front. Built Environ.

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This research paper examines Indoor Air Quality (IAQ) conditions in newly constructed apartments in Dubai to be more sustainable for residents to have healthier lifestyles. Enhanced airtightness and chemical-laden materials contribute to IAQ pollution in these buildings. The study aims to assess pollutant concentrations and variations based on building height. Measurements were conducted in 12 apartment units using the WHO’s IAQ assessment methodology. Most pollutants were within limits, but TVOC exceeded the Dubai Municipality’s standard, measuring at 2634.4 μg/m³, approximately nine times higher than the standard. HCHO (163.4 μg/m³) and toluene (551.4 μg/m³) were identified as significant pollutants with potential health effects. Analysis of pollutant concentrations based on building height revealed higher TVOC levels in upper areas, with 2,828 μg/m³ in the upper area compared to 2,443 μg/m³ in the lower area, indicating more severe indoor air pollution in Ethylbenzene and styrene also highest in upper areas, with ethylbenzene at 122 μg/m³ and styrene at 82 μg/m³ in the upper area, potentially due to elevated sources. Toluene and xylene concentrations were elevated in the middle area, with toluene at 574 μg/m³ and xylene at 321 μg/m³, likely influenced by materials and occupant activities. Benzene concentrations were consistent across all heights at 2.94 μg/m³, suggesting a common source. HCHO concentrations were relatively consistent but slightly higher in the middle and upper areas, with 171 μg/m³ in both, likely influenced by ventilation and emissions. While average pollutant concentrations met WHO standards, many units exceeded recommended limits, requiring targeted interventions. The study highlights the importance of addressing IAQ concerns and implementing strategies to reduce indoor air pollutants and improve ventilation. These findings contribute to IAQ knowledge in Dubai’s residential buildings, guiding policymakers, architects, and developers in effective policies and guidelines. Further research on seasonal variations and other IAQ factors is recommended for better understanding and long-term monitoring. Prioritizing IAQ in newly constructed apartments is crucial for healthier living in Dubai. The residential building sector can protect residents’ health by implementing appropriate measures while delivering upscale living experiences.

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Simulating the natural lighting for a physical and mental Well-being in residential building in Dubai, UAE

Cited by 16 publications

References 65 publications

Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index

Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index

The Impact of Different Color Temperatures and Sources of Light on Mood and Vision: Acuity and Color Recognition

Enhancing indoor air quality and sustainable living in newly constructed apartments: insights from Dubai

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