Daylighting simulation for the configuration of external sun-breakers on south oriented windows of hospital patient rooms under a clear desert sky

Wagdy, Ayman; Sherif, Ahmed; Sabry, Hanan; Arafa, Rasha; Mashaly, Islam A.

doi:10.1016/j.solener.2017.04.009

Cited by 30 publications

(15 citation statements)

References 6 publications

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“…Results showed that flat-shaped slats or gently curved achieved better results in both daylighting and external view exposure. Wagdy et al, (2017) investigated the main characteristics of sun breakers to control solar access in south-oriented inboard and outboard bathroom hospital patient room under the clear sky of Cairo, Egypt. He targeted the effect of cut-off angles and their corresponding tilt angles.…”

Section: Figure (1)mentioning

confidence: 99%

“…Results showed that horizontal sun breakers were achieved the most successful performance in both layouts in all tested window to wall ratio. The paper concluded that the cut-off angle was more influential than the tilt angle in providing adequate daylighting performance (Wagdy, et al, 2017).…”

Section: Figure (1)mentioning

confidence: 99%

“…As mentioned in similar papers, another criterion was taken under consideration that the sDA percentage should achieve 100% of the bed surface area (Wagdy, et al, 2017;Sherif, et al, 2016). This criterion was explicitly devised to reflect the strict needs of patient care in hospital patient rooms to aid in the healing process.…”

Section: Criterion (2): Bed Area Requirementmentioning

confidence: 99%

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Double-Skin Facades in Healing Environments: An Approach for Enhancing Daylighting Performance in South-Oriented Patient Rooms in Cairo, Egypt

Al-Shafaey

Abdelkader

Sabry

et al. 2020

Engineering Research Journal

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Daylighting provision is an efficient approach in achieving a healing environment. Several researches praised the effect of daylight on stress reduction, shorter hospital length of stay, and the increasing of patients' satisfaction. The building façade has the primary role in controlling the indoor environment. In addition to daylighting, Double-Skin Façade (DSF) is an approach that can create a balance between patients' needs without sacrificing energy reduction and thermal comfort in the hot arid desert climate. This paper aimed at investigating the effect of fixed horizontal louvers integration in a multi-story double-skin façade to enhance daylighting performance and visual comfort in south-oriented patient rooms located in Cairo, Egypt. Rhinoceros software was used for modeling the proposed designs coupled with Diva-4-Rhino for daylighting simulations. The effect of changing louver's depth and slats' number resulted in 16 designs that were modeled for examination. Daylighting performance was analyzed by two metrics; Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) on both the room surface floor and bed surface planes to represent daylight distribution and visual discomfort, respectively. Results showed that all cases were successful, achieving 100% sDA value on the bed plane area. However, the sDA and ASE values at the room floor area were different. Three louvered double-skin façade designs have succeeded in meeting sDA and ASE acceptance criteria and were recommended for integrating in patient rooms. Also, it was noticed that the unshaded double-skin façade presented the worst performance.

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Section: Figure (1)mentioning

confidence: 99%

Section: Figure (1)mentioning

confidence: 99%

Section: Criterion (2): Bed Area Requirementmentioning

confidence: 99%

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Double-Skin Facades in Healing Environments: An Approach for Enhancing Daylighting Performance in South-Oriented Patient Rooms in Cairo, Egypt

Al-Shafaey

Abdelkader

Sabry

et al. 2020

Engineering Research Journal

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“…In recent years, there has been dramatic increase in employing Grasshopper [25] with daylighting, glare simulation as well as per-pixel post-processing applications [26][27][28][29][30]. Grasshopper is a 3D parametric modelling extension plug-in for Rhinoceros.…”

Section: Developing Fisheye Remapping Toolmentioning

confidence: 99%

A Parametric Method for Remapping and Calibrating Fisheye Images for Glare Analysis

Wagdy

Hansen

Isoardi³

et al. 2019

Buildings

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High Dynamic Range (HDR) imaging using a fisheye lens has provided new opportunities to evaluate the luminous environment in visual comfort research. For glare analysis, strict calibration is necessary to extract accurate luminous maps to achieve reliable glare results. Most studies have focused on correcting the vignetting effect in HDR imaging during post-calibration. However, the lens projection also contributes to luminous map errors because of its inherent distortion. To date, there is no simple method to correct this distortion phenomenon for glare analysis. This paper presents a parametric-based methodology to correct the projection distortion from fisheye lenses for the specific use in glare analysis. HDR images were captured to examine two devices: a 190 • equisolid SIGMA 8 mm F3.5 EX DG fisheye lens mounted on a Canon 5D camera, and a 195 • fisheye commercial lens with an unknown projection, mounted on the rear camera of a Samsung Galaxy S7. A mathematical and geometrical model was developed to remap each pixel to correct the projection distortion using Grasshopper and MATLAB. The parametric-based method was validated using Radiance and MATLAB through checking the accuracy of pixel remapping and measuring color distortion with Structural Similarity Index (SSIM). Glare scores were used to compare the results between both devices, which validates the use of mobile phones in photometric research. The results showed that this method can be used to correct HDR images projection distortion for more accurate evaluation of the luminous environment in glare research.

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“…They can also be in different shapes and mechanisms according to facades' orientations and buildings' needs. It has been found that using automated louvers can reduce the users' behaviour of turning on the electric light, which can save electrical energy by up to 30% due to the utilization of daylight [12,13].In similar cases, light reflectors (louvers) usually used to control the solar penetration into the space, and improves the daylighting distribution which will in turn decrease the visual discomfort via reducing the glare [14,15].Such measures will contribute significantly in reducing the need for electric lighting, thus reducing the overall operative energy demands [16].Previous work in the same field discussed the use of either flat or curved section louvers to achieve better visual comfort while focusing on energy consumption [17][18][19][20][21]. From another point of view, the use of static identically shaped louvers has been argued by Thuot and Andersen [22] for emitting daylight at too high or downward angle at particular times of the day and year, causing glare under direct sunlight.…”

Section: Aementioning

confidence: 99%

Daylighting Distribution Enhancement for Deep Office Spaces via Dynamic Louvers System, a case study in Cairo, Egypt.

Zayed

Elkhateib

Mahdy

et al. 2018

The International Conference on Civil and Architecture Engineer

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Integrating daylighting systems within building skin has grabbed numerous attentions, as a strategy to improve the natural lighting performance in deep office spaces.However, the stability and uniformity of daylight distribution throughout a day inside a building remain a challenge. The main concern of this work is to asses an advanced integrated daylighting system with automaticallycontrolled externallouvers throughout the year.A parametric design approach will facilitatea multistep comparison studyin order to identify the proper design for the system.A relatively uniform daylight range of 500-2000 lux was intended to be kept over the task-plans in the model of an 8 m deep office. A simulation of an office building in Cairo was chosen asa case study, where it is south oriented with a prevailing condition of clear sky. The simulations will be conducted over four main periods (March, June, September, and December) to present the different seasons of the year.On the 21 st day of each chosen month,three differentpoints on time at 9am, 12pm, and 3pm were utilized. Wide ranges of angles were tested in order to explore the perfect inclination for the louvers in each period to take the most advantage from using natural daylight.Accordingly, three angles (56°, 59° and 62°) were selected per annum to fulfill the predefined criteria at the twelve times representing the four seasons (at 9.00 am, 12.00 pm and 3.00 pm) on the 21 st of March (vernal equinox); 21 st of June (summer solstice); 21 st of September (autumnal equinox) and 21 st of December (winter solstice). The aforementioned angles achieved the performance indicators targeted in the current study for daylight distribution. This study is a part of ongoing research that aims to investigate the impact of the geometric configurations of louvers systems on improving the daylighting performance, in deep office buildings spaces in Egypt.Various software packageswere used in the work such as Rhino, Grasshopper and DIVA for modelling and simulating the generic office space.

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Daylighting simulation for the configuration of external sun-breakers on south oriented windows of hospital patient rooms under a clear desert sky

Cited by 30 publications

References 6 publications

Double-Skin Facades in Healing Environments: An Approach for Enhancing Daylighting Performance in South-Oriented Patient Rooms in Cairo, Egypt

Double-Skin Facades in Healing Environments: An Approach for Enhancing Daylighting Performance in South-Oriented Patient Rooms in Cairo, Egypt

A Parametric Method for Remapping and Calibrating Fisheye Images for Glare Analysis

Daylighting Distribution Enhancement for Deep Office Spaces via Dynamic Louvers System, a case study in Cairo, Egypt.

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