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Ayman Mahmoud
Professor of Architecture Engineering, Architecture Engineering Department, Faculty of Engineering, Cairo University, 12613 Giza, Egypt

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Journal article
Published: 11 June 2021 in Journal of Advanced Research
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Adapted reuse in old historical buildings has been a real challenge since the state of deterioration is usually found severe, and suggested retrofitting is applied with high delicacy to preserve the building originality. Additionally, on altering the potential users’ activity, special considerations are required to fulfill the new needs. Daylight in historical buildings has a special significance in conceiving the massive artistic content within the interior spaces, in providing visual comfort for users, and affecting the total energy performance. The main goal is to meet the new daylight requirements in heritage building spaces, and to rely on relaxing daylight instead of artificial light sources during the day. The research is implemented in Tosson Palace, a historical palace in Egypt, where a top-lit space’s daylight performance is assessed using Rhino + Grasshopper’s Diva package, then the skylight is parametrically configured to optimize daylighting conditions using Radiance, and Daysim engines in high intensity solar climate. Optimization of skylight glazing technologies and skylight size is conducted by changing optimization parameters including the number the two perpendicular mullions grid, and mullions’ depth, which also acts as a shading element. These parameters are genetically optimized using a multi-objective octopus plugin and the optimized configuration is evaluated using LEED v4.1 in Spatial Daylight Autonomy (sDA), and Annual Sun Exposure (ASE) criteria that show both the daylight adequacy, and the comfortable daylight exposure percentages in the skylight covered space. The outcomes offer guidance for heritage adapted reuse in hot climatic conditions with minimum design interventions to meet the original design and provide potential users’ comfort conditions. Furthermore, enhancement of both visual, and thermal conditions through the skylight configurations is to be studied. The selected optimum case succeeded in compromising the assessing metrics such that ASE was reduced by 38% from the base-case, avoiding unpleasant direct daylight, and providing protection for interior artifacts from sunlight and achieving a moderate uniform daylight distribution on both affected floors levels.

ACS Style

Mohamed Marzouk; Maryam ElSharkawy; Ayman Mahmoud. Optimizing Daylight Utilization of Flat Skylights in Heritage Buildings. Journal of Advanced Research 2021, 1 .

AMA Style

Mohamed Marzouk, Maryam ElSharkawy, Ayman Mahmoud. Optimizing Daylight Utilization of Flat Skylights in Heritage Buildings. Journal of Advanced Research. 2021; ():1.

Chicago/Turabian Style

Mohamed Marzouk; Maryam ElSharkawy; Ayman Mahmoud. 2021. "Optimizing Daylight Utilization of Flat Skylights in Heritage Buildings." Journal of Advanced Research , no. : 1.

Journal article
Published: 06 January 2021 in Sustainability
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In hot, arid regions on university campuses, students are more vulnerable to heat stresses than in street canyons in terms of function; however, the knowledge of the impact of built environments on thermal performance is still lacking. In two summer and winter days, the shading effect of the existing urban trees pattern in a university campus in Egypt was examined to correlate their Sky View Factor (SVF) with the thermal environment, meteorology, Physiological Equivalent Temperature (PET), and Universal Thermal Comfort Index (UTCI). The ENVI-met model was used in order to assess meteorological parameters, followed by SVF calculation in the Rayman program. Meteorological field measurements validated the simulation model and measured the Leaf Area Index (LAI) of two native urban trees to model the in-situ canopies foliage. In summer, the results showed a significant direct impact of the SVF on mean radiant temperature (Tmrt), PET, and UTCI; however, the excessive shading by trees on materials with a low albedo and low wind speed could lead to a slight increase in air temperature. Meanwhile, in the winter, SVF did not affect the microclimatic variables, PET, or UTCI. The resulting insight into the correlation between SVF and Tmrt emphasizes the importance of urban trees in modifying the microclimates of already-existing university plazas.

ACS Style

Randa Shata; Ayman Mahmoud; Mohammad Fahmy. Correlating the Sky View Factor with the Pedestrian Thermal Environment in a Hot Arid University Campus Plaza. Sustainability 2021, 13, 468 .

AMA Style

Randa Shata, Ayman Mahmoud, Mohammad Fahmy. Correlating the Sky View Factor with the Pedestrian Thermal Environment in a Hot Arid University Campus Plaza. Sustainability. 2021; 13 (2):468.

Chicago/Turabian Style

Randa Shata; Ayman Mahmoud; Mohammad Fahmy. 2021. "Correlating the Sky View Factor with the Pedestrian Thermal Environment in a Hot Arid University Campus Plaza." Sustainability 13, no. 2: 468.

Journal article
Published: 01 June 2017 in Journal of Cleaner Production
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ACS Style

Rania Moussa; Ayman Mahmoud. Energy-scape elements: An approach on integrating landscape elements with renewable energy devices. Journal of Cleaner Production 2017, 153, 114 -130.

AMA Style

Rania Moussa, Ayman Mahmoud. Energy-scape elements: An approach on integrating landscape elements with renewable energy devices. Journal of Cleaner Production. 2017; 153 ():114-130.

Chicago/Turabian Style

Rania Moussa; Ayman Mahmoud. 2017. "Energy-scape elements: An approach on integrating landscape elements with renewable energy devices." Journal of Cleaner Production 153, no. : 114-130.

Journal article
Published: 01 March 2016 in Solar Energy
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Recent literature shows that experimentation in kinetics and architectural skins is more widely introduced as a solution for environmental-related design issues. Facades and elements are transformed in kinetic living creatures changing in synchrony with the surrounding environment. Through the lens of morphology, this research explores the possibilities of kinetic composition afforded by facades in motion. It presents a method for the evaluation of kinetic facades system performance using experimental approach. The experiments investigate improving daylight performance through the design and motion of kinetic facades using various integrated software. The impact of kinetic motion of hexagonal pattern on south-facing skin to control the daylight distribution in an office space is studied using parametric simulation technique. Results demonstrate the analysis of rotational and translation kinetic motions at the early design stage compared to a traditional window (base case). Finally, possible configurations to enhance daylight performance are suggested.

ACS Style

Ayman Mahmoud; Yomna Elghazi. Parametric-based designs for kinetic facades to optimize daylight performance: Comparing rotation and translation kinetic motion for hexagonal facade patterns. Solar Energy 2016, 126, 111 -127.

AMA Style

Ayman Mahmoud, Yomna Elghazi. Parametric-based designs for kinetic facades to optimize daylight performance: Comparing rotation and translation kinetic motion for hexagonal facade patterns. Solar Energy. 2016; 126 ():111-127.

Chicago/Turabian Style

Ayman Mahmoud; Yomna Elghazi. 2016. "Parametric-based designs for kinetic facades to optimize daylight performance: Comparing rotation and translation kinetic motion for hexagonal facade patterns." Solar Energy 126, no. : 111-127.

Journal article
Published: 01 March 2015 in Frontiers of Architectural Research
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Trees are a major factor in defining the spatial qualities of outdoor spaces. This study investigates the influence of spatial configuration produced by the proposed tree planting design on the visual fields of an urban park using space syntax theory. Space syntax theory assumes that an urban area can be represented as a matrix of connected spaces. The quantitative properties of this matrix in the form of syntactic measures can be measured using computer simulations. This research investigates how space syntax techniques can help assess the effect of tree configurations on the social structure of a small-scale garden in an urban park. Such techniques are assumed useful in predicting the social structure of the proposed space and in assessing design alternatives. An experimental study using three different planting design proposals for an urban park is conducted. Data are analyzed using space syntax techniques. Results reveal a significant effect of planting configurations on syntactic measures across the three proposals. This study suggests that space syntax techniques may have a significant value in the assessment of schematic planting design, especially at the pedestrian movement level

ACS Style

Ayman Mahmoud; Reham H. Omar. Planting design for urban parks: Space syntax as a landscape design assessment tool. Frontiers of Architectural Research 2015, 4, 35 -45.

AMA Style

Ayman Mahmoud, Reham H. Omar. Planting design for urban parks: Space syntax as a landscape design assessment tool. Frontiers of Architectural Research. 2015; 4 (1):35-45.

Chicago/Turabian Style

Ayman Mahmoud; Reham H. Omar. 2015. "Planting design for urban parks: Space syntax as a landscape design assessment tool." Frontiers of Architectural Research 4, no. 1: 35-45.

Journal article
Published: 31 December 2011 in Building and Environment
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ACS Style

Ayman Mahmoud. Analysis of the microclimatic and human comfort conditions in an urban park in hot and arid regions. Building and Environment 2011, 46, 2641 -2656.

AMA Style

Ayman Mahmoud. Analysis of the microclimatic and human comfort conditions in an urban park in hot and arid regions. Building and Environment. 2011; 46 (12):2641-2656.

Chicago/Turabian Style

Ayman Mahmoud. 2011. "Analysis of the microclimatic and human comfort conditions in an urban park in hot and arid regions." Building and Environment 46, no. 12: 2641-2656.

Journal article
Published: 30 May 2011 in Landscape and Urban Planning
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ACS Style

Ayman Mahmoud; Marwa Adel El-Sayed. Development of sustainable urban green areas in Egyptian new cities: The case of El-Sadat City. Landscape and Urban Planning 2011, 101, 157 -170.

AMA Style

Ayman Mahmoud, Marwa Adel El-Sayed. Development of sustainable urban green areas in Egyptian new cities: The case of El-Sadat City. Landscape and Urban Planning. 2011; 101 (2):157-170.

Chicago/Turabian Style

Ayman Mahmoud; Marwa Adel El-Sayed. 2011. "Development of sustainable urban green areas in Egyptian new cities: The case of El-Sadat City." Landscape and Urban Planning 101, no. 2: 157-170.

Journal article
Published: 31 March 2011 in Building and Environment
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Climate considerations are essential dimensions in the assessment of quality of outdoor built environments. This paper provides an analysis of bioclimatic classification of Egypt to help the environmental design of wide range of purposes, including: climate responsive design; energy conservation and thermal comfort in the outdoor built environments. The analysis of this classification uses a bioclimatic approach in which the comfort zone and monthly climatic lines were determined and plotted on the psychrometric chart. Since the mean radiant temperature (Tmrt) is the most important input parameter for the energy balance in outdoor environments, the charts apply the ASHRAE 55-2004 standard considering the operative temperature as a function of Tmrt. Analysis for each bioclimatic zone determines the potential of passive design strategies to maintain thermal comfort in outdoor spaces and to contribute to energy efficient built environment. Finally, this study suggests a design guideline matrix for landscape architectural design for the different bioclimatic zones.

ACS Style

Ayman Mahmoud. An analysis of bioclimatic zones and implications for design of outdoor built environments in Egypt. Building and Environment 2011, 46, 605 -620.

AMA Style

Ayman Mahmoud. An analysis of bioclimatic zones and implications for design of outdoor built environments in Egypt. Building and Environment. 2011; 46 (3):605-620.

Chicago/Turabian Style

Ayman Mahmoud. 2011. "An analysis of bioclimatic zones and implications for design of outdoor built environments in Egypt." Building and Environment 46, no. 3: 605-620.