References of "Amer, Mohamed"
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See detailA Framework for Cost-Optimal Zero-Energy Lightweight Construction
Amer, Mohamed ULiege; Attia, Shady ULiege

in 2019 Proceedings of the Symposium on Simulation for Architecture & Urban Design (2019, April 09)

During the last decade, several roof extensions took place in the European cities with the purpose to increase the height of existing buildings using timber as a lightweight material. However, building ... [more ▼]

During the last decade, several roof extensions took place in the European cities with the purpose to increase the height of existing buildings using timber as a lightweight material. However, building regulations and green codes do not usually guarantee the achievement of multi-objective and highly performance roof extensions. Accordingly, this research aims to develop a state of the art framework to achieve cost-optimal zero-energy for timber construction, specifically when building on rooftops. Through a simulated and calibrated passive house model, the boundary conditions of the study have been identified and further parametric simulation and optimization have been carried out. This research aims at linking scientific research with practice. The framework provides a fast track measurement that provides a solutions space for building engineers who are in charge of decision making on the design and construction process. Best practices of roof construction could be achieved in terms of cost and energy, giving a vast potential for a complete and deep renovation, and, therefore, reducing the overall ecological footprint on the city level. [less ▲]

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See detailIdentification of Sustainable Indicators for Decision-Making on Roof Stacking Construction Method
Amer, Mohamed ULiege; Attia, Shady ULiege

in Sustainable Cities and Society (2019)

Accommodating populations in cities became increasingly a complex task. With the mounting local and global migration seeking better opportunities in cities, the current urban agendas has put forward ... [more ▼]

Accommodating populations in cities became increasingly a complex task. With the mounting local and global migration seeking better opportunities in cities, the current urban agendas has put forward compact cities as a promising solution towards sustainable urban development. Roof stacking is considered an approach towards increasing cities’ density. However, the selection of optimum roof stacking construction method is merely based on subjective evidence based on architects’ or owners requirements. There is an urgent need to identify sustainable indicators for decision making for roof stacking. Therefore, this research aimed to identify the influential criteria behind the selection and decision making on roof stacking methods. An intensive review of literature, individual interview, and pilot surveys have been carried out. A list of 37 sustainable indicators have been identified based on sustainability triple bottom line, i.e. environmental, economic, and social. A questionnaire has been design and distributed to architects and building engineers as active stakeholders. The importance of the identified indicators have been categorized and ranked. The outcomes of this research draws the line to develop a new tool that facilitates the construction of sustainable roofs in European cities. [less ▲]

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See detailTimber construction methods for roof stacking: Classification and comparative analysis
Amer, Mohamed ULiege; Attia, Shady ULiege

in Proceedings of World Conference on Timber Engineering - WCTE 2018 (2018, August)

As a mean of accommodating increasing population in major cities around Europe, new agendas for urban densification emerge in response of finding sustainable solutions. Several methods for urban ... [more ▼]

As a mean of accommodating increasing population in major cities around Europe, new agendas for urban densification emerge in response of finding sustainable solutions. Several methods for urban densification are proposed and seen in real life. Roof stacking has been proposed as a way to promote for sustainable urban densification. This paper presents the results of a conducted investigation on roof stacking assembly and construction methods using timber construction. A classification for different roof stacking has been proposed, followed by a comparative analysis between different methods. The comparative analysis identifies the advantages, disadvantages, and best practice of each method. A parametric simulation and multi-objective optimization have been carried out for two different methods to identify the optimum timber construction for roof stacking. The results shed the light on the solutions and recommended timber construction method according to the comparative analysis. [less ▲]

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See detailIndoor Thermal Comfort Assessment of Residential Building Stock in Quetta, Pakistan
Mahar, Waqas Ahmed ULiege; Amer, Mohamed ULiege; Attia, Shady ULiege

in Hartig, Terry (Ed.) European Network for Housing Research (ENHR) Annual Conference 2018 (2018, June 29)

Since last several years Pakistan is facing energy crisis which leads to power-cuts across the country resulting serious disturbance in everyday life. However, residential buildings use more than half of ... [more ▼]

Since last several years Pakistan is facing energy crisis which leads to power-cuts across the country resulting serious disturbance in everyday life. However, residential buildings use more than half of the energy and its demand and usage is continuously increasing. Quetta is the 10th largest city of Pakistan and its urban population is increasing at a high rate. The climate of Quetta is mild to extreme cold in winter and hot in summer which need more heating and cooling for optimal thermal comfort in houses. Energy usage of a household do not only depend on the performance of the building, heating, and cooling systems but also on the life style of the residents. The chosen typology is reinforced cement concrete houses, which is very common and widespread across the country. There is no policy or measures taken at the authority level and most of the houses are not designed by professionals, therefore, the existing houses do not provide optimal indoor thermal comfort. The study consists the monitoring of indoor climate, interviews, and questionnaire. The thermal comfort level was quantified based on the monitored data, and the interviews and questionnaire helped to understand the comfort perception, energy consumption behaviour and life style of the residents. The results show that residential buildings do not provide optimal thermal comfort and residents use active systems to improve indoor thermal comfort which leads to increase in energy usage. [less ▲]

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See detailUrban Densification through Roof Stacking: Case Study
Amer, Mohamed ULiege; Reiter, Sigrid ULiege; Attia, Shady ULiege

in Hartig, Terry (Ed.) European Network for Housing Research (ENHR 2018) (2018, June 27)

Nowadays, major European cities witness one of their greatest challenges in history. Increasing migration from the rural areas, not to mention the massive migrations from the east, contributes in ... [more ▼]

Nowadays, major European cities witness one of their greatest challenges in history. Increasing migration from the rural areas, not to mention the massive migrations from the east, contributes in aggravating the challenge. As a response, United Nations urban agendas promote for developing urban spatial frameworks based on appropriate compactness, polycentrism and mixed use, preventing urban sprawl and marginalization. In this research, a methodology is presented that aids the decision making on roof stacking as a sustainable approach towards urban densification. Brussels Capital Region in Belgium is chosen as a case study to represent the outcomes of a methodology that has been developed to identify urban densification potential through roof stacking. Further applications to generalize the approach to fit other cities in Europe would help create additional opportunities to develop an automated tool for estimating such potentials on a wider scope. [less ▲]

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See detailDevelopment of decision making criteria for roof stacking construction method selection
Amer, Mohamed ULiege; Attia, Shady ULiege

Poster (2018, May 30)

Accommodating populations in cities became increasingly a complex task. With the mounting local and global migration seeking better opportunities in cities, the current urban agendas has put forward ... [more ▼]

Accommodating populations in cities became increasingly a complex task. With the mounting local and global migration seeking better opportunities in cities, the current urban agendas has put forward compact cities as a promising solution towards sustainable urban development. Roof stacking is considered an approach towards increase cities’ density. However, the selection of optimum roof stacking construction method is merely based on subjective evidence based on architects’ or owners requirements. There is an urgent need to identify a universal criteria for decision making for sustainable roof stacking. Therefore, this research aims to identify the influential criteria behind the selection and decision making on roof stacking methods. An intensive review of literature, individual interview, and pilot surveys have been carried out. A list of 37 decision making criteria have been identified and characterised under six categories: cost, time, safety, quality, environment, and logistics. A questionnaire has been design and surveyed among less than 300 architects, as active stakeholders, in addition to researchers from the field of building and construction. The importance of the identified criteria have been ranked. As a result, safety and quality measures of construction were set as priority followed by environmental measurements resembled in energy consumption. The outcomes of this research draws the lines to develop a new tool for aiding the decision making process on roof stacking [less ▲]

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See detailA Methodology to Determine the Potential of Urban Densification through Roof Stacking
Amer, Mohamed ULiege; Mustafa, Ahmed; Teller, Jacques ULiege et al

in Sustainable Cities and Society (2017), 35

Facing the need to accommodate a growing number of inhabitants in major European cities, this research aimed to establish a methodology that facilitates decision making on urban densification through roof ... [more ▼]

Facing the need to accommodate a growing number of inhabitants in major European cities, this research aimed to establish a methodology that facilitates decision making on urban densification through roof stacking. The methodology adopts a systematic approach on three consecutive levels: urban, engineering, and social. Multiple criteria are identified to assess and map the roof stacking potential in terms of location and number of added floors. The Brussels Capital Region was chosen as a case study to experiment with the developed workflow chart and validate the proposed approach, using ArcGIS software, by creating a map of the urban densification potential through roof stacking of Brussels at the city scale. The results show a realistic potential of accommodating 30% of the expected population increase in Brussels by the year 2040 using only roof stacking, provided that the current urban regulations are respected. In addition, a theoretical potential to accommodate more than the expected population increase by the same year is proposed provided that urban planning regulations are relaxed in relation to the height of buildings. Further applications to other cities in Europe would help create additional opportunities to develop an automated tool for estimating such potentials on a wider scope. [less ▲]

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See detailROOF STACKING: Learned Lessons from Architects
Amer, Mohamed ULiege; Attia, Shady ULiege

Report (2017)

Roof Stacking represents an approach to accommodate increasing population in the major cities around Europe, new agendas for urban densification emerge in response of finding sustainable solutions to use ... [more ▼]

Roof Stacking represents an approach to accommodate increasing population in the major cities around Europe, new agendas for urban densification emerge in response of finding sustainable solutions to use existing urban infrastructure in the most efficient ways. Several methods for urban densification are being proposed and seen in real life. One of those methods is roof stacking, which is defined as the added structure over the rooftop of an existing building to create one or more stories of living spaces. This report represents the results of conducted investigation on roof stacking method as a sustainable approach for urban densification. The aim of this report is to present a guideline for roof stacking construction approaches and methods and present the learned lessons through interviewing notable architects from different European countries who applied roof stacking. This report identifies the challenges and opportunities when applying roof stacking in addition to proposing recommended solution for the different obstacles that are faced when adding extensions on the rooftops. [less ▲]

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See detailDenCity: Zero Energy Lightweight Construction Households for Urban Densification
Amer, Mohamed ULiege; Attia, Shady ULiege

in 4th Doctoral Seminar on Sustainability Research in the Built Environment (2017, April 24)

Population movements towards major cities in Europe are growing exponentially. By 2020, it is expected that 80% of Europe’s population will live in cities, which creates the need to develop more compact ... [more ▼]

Population movements towards major cities in Europe are growing exponentially. By 2020, it is expected that 80% of Europe’s population will live in cities, which creates the need to develop more compact districts and suburbs by increasing their density. This research aims to establish a methodology that aids decision making on urban densification through roof stacking. The methodology adopts a systematic approach on three consecutive levels; urban, engineering, and social. A multiple criteria are identified that maps roof stacking potential in terms of location and number of added floors. Brussels Capital Region is chosen as a case study to experiment the workflow using ArchGIS software and to validate the developed approach creating a map on the city scale. The results show the potential to accommodate more than the expected population increase by the year 2040 in Brussels through roof stacking only. Yet, further applications on different cities around Europe would help valorising the applied methodology and to open further opportunities to develop an automated tool that estimates those potentials on wider scope. [less ▲]

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See detailMultivariable Optimization for Zero Over-lit Shading Devices in Hot Climate
Amer, Mohamed ULiege; Wagdy, Ayman

in Proceedings of the 3rd IBPSA-England Conference BSO 2016 (2016, September)

The climate in Egypt is gifted with a clear sunny sky most of the year, providing the excellent opportunity to benefit from natural lighting yet, there is high risk to exceed the amount of daylighting ... [more ▼]

The climate in Egypt is gifted with a clear sunny sky most of the year, providing the excellent opportunity to benefit from natural lighting yet, there is high risk to exceed the amount of daylighting required for doing a specific task based on the latest standards. Thus, the design for highly efficient and optimized shading device is essential at the first stage. This research aims to study a South oriented facade and to present optimized solutions for an oval-shaped shading device for a typical office space. The optimization process triggers two main targets, zero over lit floor area with maximum daylit area. Final results also fulfilled the highest daylighting quality based on the values recommended by both IES and LEED V4 standards. [less ▲]

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See detailDenCity: Zero Energy Light Weight Construction Households for Urban Densification
Amer, Mohamed ULiege; Attia, Shady ULiege

in Rencontres Universitaires de Génie Civil de l'AUGC (2016, May 25)

This paper is a part of an ongoing research in the field of sustainable urban densification through providing innovative solutions for zero energy light weight construction. The focus aim of this research ... [more ▼]

This paper is a part of an ongoing research in the field of sustainable urban densification through providing innovative solutions for zero energy light weight construction. The focus aim of this research is to identify the gaps in the construction solutions for roof stacking, to feed in the innovation pipeline of the European construction landscape in the coming years. This paper presents a comprehensive review of different case studies and efforts in the field of roof raising and its repetition potentials. Based on a structured review, 8 different cases from three different European countries were sorted, placing a variety of methods in comparison with each other. The main contribution of this review lies in the analyses of the existing information in this field and the classification of the different validated methods and approaches that has been used. Finally, despite the existing challenges, it was found that the concept of roof stacking can be widely spread and applied in different contexts. Future research is going to investigate possible solution and to formulate structured scientific approaches to widen its application. [less ▲]

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See detailDenCity: Zero Energy Lightweight Construction Households for Urban Densification
Amer, Mohamed ULiege; Attia, Shady ULiege

Scientific conference (2016, April 27)

Belgium, like many European Countries, has a serious challenge in the housing sector. The Federal planning bureau estimates the increase of the population by one million inhabitants by 2030, which ... [more ▼]

Belgium, like many European Countries, has a serious challenge in the housing sector. The Federal planning bureau estimates the increase of the population by one million inhabitants by 2030, which represent 600,000 additional family requiring accesses to new housing facilities. There is a significant housing shortage for individual, single parent families, seniors and students. Population ageing (mainly due to increase life expectancy) combined with a constant grow rate of individuals living in collective households, leads to a substantial increase of demand of collective households. Furthermore, the stringent European performance environmental regulations for the building sector require that by 2020, all new construction are zero or nearly zero energy, (equivalent to 15 kWh/m2/year), with 60% efficient on-site coverage by renewable energy. The shortage of vacant land and the increasing energy performance requirements is pushing the idea of urban densification and zero energy construction households. [less ▲]

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See detailReducing cooling demands in a hot dry climate: A simulation study for non-insulated passive cool roof thermal performance in residential buildings
Dabaieh, Marwa; Wanas, Omar; Amer, Mohamed ULiege et al

in Energy and Buildings (2015), 89(Supplement C), 142-152

In hot dry climates, it is estimated that almost half the urban peak load of energy consumption is used to satisfy air-conditioning cooling demands in summer time. Since the urbanization rate in ... [more ▼]

In hot dry climates, it is estimated that almost half the urban peak load of energy consumption is used to satisfy air-conditioning cooling demands in summer time. Since the urbanization rate in developing countries – like the case in Egypt – is rising rapidly, the pressure placed on energy resources to satisfy inhabitants’ indoor comfort requirements is consequently increasing too. This paper introduces passive cool roof as a means of reducing energy cooling loads for satisfying human comfort requirements in a hot climate. A designed algorithmic hybrid matrix was used to simulate 37 roof design probabilities alternating roof shape, roof material and construction. The result of using a vault roof with high albedo coating shows a fall of 53% in discomfort hours and saves 826 kW h during the summer season compared to the base case of the conventional non insulated flat roof in a typical Cairo residential buildings. It is recommended that the selected cool roof solution be combined with natural ventilation to increase the indoor thermal comfort, and with passive heating strategies to compensate the increase in heating hours. The application is intended for low cost residential buildings in a hot dry climate. [less ▲]

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See detailInvestigation into the Influence of External Walls Reflectivity on the Indoor Daylight Availability in Desert Climates
Amer, Mohamed ULiege; Attia, Shady ULiege

in Conference Proceedings: Building Simulation and Optimization 2014 (2014, June)

Hot arid climates are characterized by clear sunny sky most of the year time. Such climates affects the urban morphology, which requires sometimes dense urban fabric. Narrow streets have significant ... [more ▼]

Hot arid climates are characterized by clear sunny sky most of the year time. Such climates affects the urban morphology, which requires sometimes dense urban fabric. Narrow streets have significant effect on the amount of daylight permeating indoor residential zones, which may have a negative or positive effect on the overall visual performance. This paper studies the quantitative effect of using different Façade reflectivity ratios, under different street widths, on the indoor daylight autonomy. The researcher performed a parametric analysis using DIVA for Rhino simulation tool on a hypothetical residential building unit with various window ratios facing neighbouring buildings. Four main orientations were examined under different urban contexts and wall reflectivity. This paper aims to measure daylight autonomy and address possible strategies and solutions to achieve better daylighting that can be used by architects at early design stages of housing developments in the desert climates. [less ▲]

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See detailParametric Analysis for Daylight Autonomy and Energy Consumption in Hot Climates
Amer, Mohamed ULiege; Moro, Jose Luis; Attia, Shady ULiege

in Building Simulation Conference, Chambéry 25-28 August 2013 (2013)

Signifcant contradiction arises in buildings in the hot climate regions when relating window sizes and shadings to achieve both reduced energy consumption (requiring minimum opening ratios and more ... [more ▼]

Signifcant contradiction arises in buildings in the hot climate regions when relating window sizes and shadings to achieve both reduced energy consumption (requiring minimum opening ratios and more shading) and suficient daylighting (requiring maximum opening ratios and less shading). This paper is a part of an on-going Master Thesis research based on a Parametric Analysis to study the quantitative effect of window’s ratio, glazing and shading techniques on Daylight Autonomy and Energy Consumption in a hot climate region. This study aims to aggregate two different parameters to achieve better daylight autonomy and less energy consumption, mentioning possible further criteria for assessing the buildings performance. [less ▲]

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