References of "Attia, Shady"
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See detailSimulation-based framework to evaluate resistivity of cooling strategies in buildings against overheating impact of climate change
Rahif, Ramin ULiege; Hamdy, Mohamed; Homaei, Shabnam et al

in Building and Environment (in press)

Over the last decades overheating in buildings has become a major concern. The situation is expected to worsen due to the current rate of climate change. Many efforts have been made to evaluate the future ... [more ▼]

Over the last decades overheating in buildings has become a major concern. The situation is expected to worsen due to the current rate of climate change. Many efforts have been made to evaluate the future thermal performance of buildings and cooling technologies. In this paper, the term “climate change overheating resistivity” of cooling strategies is defined, and the calculation method is provided. A comprehensive simulation-based framework is then introduced, enabling the evaluation of a wide range of active and passive cooling strategies. The framework is based on the Indoor Overheating Degree (IOD), Ambient Warmness Degree (AWD), and Climate Change Overheating Resistivity (CCOR) as principal indicators allowing a multi-zonal approach in the quantification of indoor overheating risk and resistivity to climate change. To test the proposed framework, two air-based cooling strategies including a Variable Refrigerant Flow (VRF) unit coupled with a Dedicated Outdoor Air System (DOAS) (C01) and a Variable Air Volume (VAV) system (C02) are compared in six different locations/climates. The case study is a shoe box model representing a double-zone office building. In general, the C01 shows higher CCOR values between 2.04 and 19.16 than the C02 in different locations. Therefore, the C01 shows superior resistivity to the overheating impact of climate change compared to C02. The maximum CCOR value of 37.46 is resulted for the C01 in Brussels, representing the most resistant case, whereas the minimum CCOR value of 9.24 is achieved for the C02 in Toronto, representing the least resistant case. [less ▲]

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See detailCharacterization of post-world war residential buildings in Belgium
Attia, Shady ULiege; Cuchet, Mathilde; Giry, Nicolas et al

Report (2022)

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See detailDeveloping a benchmark model for renovated, nearly zero-energy, terraced dwellings
Attia, Shady ULiege; Canonge, Theophile; Popineau, Mathieu et al

in Applied Energy (2022), 306(118128),

Brussels is one of the European cities with the most significant number of Passive House buildings on the continent. In the Brussels-Capital Region, the nearly zero-energy building obligations implemented ... [more ▼]

Brussels is one of the European cities with the most significant number of Passive House buildings on the continent. In the Brussels-Capital Region, the nearly zero-energy building obligations implemented is implemented since 2010. The Brussels-Capital Region has set up ambitious energy standards for new constructions. These standards target ’nearly zero’ or ’very low energy consumption and are inspired by the ’passive house standard,’ where high-energy performance is first achieved. Ten years after boasting this groundbreaking policy, many renovated, terraced houses are renovated to comply with the nearly zero-energy building requirements. Therefore, this study aims to develop an energy performance data set and one building performance simulation benchmark model for nearly zero-energy dwellings in Brussels. The study reports an inventory and field survey conducted on a terraced house renovated after the year 2010. An analysis of energy consumption (electricity and natural gas) and a walkthrough survey were conducted. A building performance simulation model is created in EnergyPlus to benchmark the average energy consumption and building characteristics. The estimate’s validity has been further checked against the public statistics and verified through model calibration and utility bill comparison. The benchmark has an average energy use intensity of 29 kWh/m2/year and represents terraced single-family houses after renovation. The paper provides a timely opportunity to evaluate the actual performance of nearly zero-energy terraced houses. The findings on energy needs and use intensity are useful in temperate and continental climates. [less ▲]

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See detailEnergy efficiency in the polish residential building stock: A literature review
Attia, Shady ULiege; Kosiński, Piotr; Wójcik, Robert et al

in Journal of Building Engineering (2022), 45(103461),

The Polish energy market heavily relies on coal. Pressured by the European Union, the Polish government has recently decided to accelerate coal phase-out and to gradually shut down all coal mines by 2049 ... [more ▼]

The Polish energy market heavily relies on coal. Pressured by the European Union, the Polish government has recently decided to accelerate coal phase-out and to gradually shut down all coal mines by 2049. In that context, it is necessary to assess the Polish energy market's state regarding energy efficiency, especially in the building stock. This paper aims to provide an overview of the current state of energy efficiency of residential buildings in Poland and insights into its future trends. A literature review was conducted, accompanied by focus group discussions with Polish building energy efficiency experts. The Polish energy sector is under a remarkable transformation that may be going too fast. A large gap between expectations, practices, and requirements can be observed. Raising awareness and capacity building in the energy efficiency sector, and a set of accessible guidelines should be developed so that the transformation is implemented correctly. A SWOT analysis results define the key opportunities and threats that are critical to meet net-zero emissions goals. The paper provides findings and insights on the 2020 targets status quo and raises awareness among stakeholders and fills a knowledge gap regarding energy efficiency in the Polish residential building stock. [less ▲]

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See detailIEA EBC Annex 80 - Dynamic simulation guideline for the performance testing of resilient cooling strategies
Zhang, Chen; Kazanci, Ongun Berk; Attia, Shady ULiege et al

Report (2021)

The objective of Annex 80 is to develop, assess and communicate solutions for resilient cooling. The systematic assessment of resilient cooling strategies is one of the main activities of Annex 80. As ... [more ▼]

The objective of Annex 80 is to develop, assess and communicate solutions for resilient cooling. The systematic assessment of resilient cooling strategies is one of the main activities of Annex 80. As stated in Annex Text: Activity B.1 includes a systematic assessment of potential benefits, limitations and performance indicators of resilient cooling systems under a wide range of application scenarios and other boundary conditions. We generate Resilient Cooling ‘Technology Profiles’ to clearly summarize and promote the operational characteristics and benefits of each technology/system. Recommendations for good implementation, commissioning and operation are being developed. Barriers to application and further research opportunities are being identified, which will inform research activities of Subtask B. The previous approach for assessing the resilience of cooling strategies is mainly based on qualitative comparison and based on results from individual research, which lacks common boundary conditions and universal indicators for resilience evaluation. This study aims to provide a consistent approach for assessing the resilience of different cooling strategies by dynamic simulation. Various cooling strategies will be tested on the reference buildings under present and future weather conditions in different climate zones, and proposed key performance indicators will be applied to evaluate summertime overheating risk and climate resistance of cooling strategies. [less ▲]

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See detailTowards Nearly-Zero Energy in Heritage Residential Buildings Retrofitting in Hot, Dry Climates
Ibrahim, Hanan; Khan, Ahmed; Serag, Yehya et al

in Sustainability (2021), 13(13934),

Retrofitting “nearly-zero energy” heritage buildings has always been controversial, due to the usual association of the “nearly-zero energy” target with high energy performance and the utilization of ... [more ▼]

Retrofitting “nearly-zero energy” heritage buildings has always been controversial, due to the usual association of the “nearly-zero energy” target with high energy performance and the utilization of renewable energy sources in highly regarded cultural values of heritage buildings. This paper aims to evaluate the potential of turning heritage building stock into a “nearly-zero energy” in hot, dry climates, which has been addressed in only a few studies. Therefore, a four-phase integrated energy retrofitting methodology was proposed and applied to a sample of heritage residential building stock in Egypt along with microscale analysis on buildings. Three reference buildings were selected, representing the most dominant building typologies. The study combines field measurements and observations with energy simulations. In addition, simulation models were created and calibrated based on monitored data in the reference buildings. The results show that the application of hybrid passive and active non-energy generating scenarios significantly impacts energy use in the reference buildings, e.g., where 66.4% of annual electricity use can be saved. Moreover, the application of solar energy sources approximately covers the energy demand in the reference buildings, e.g., where an annual self-consumption of electricity up to 78% and surplus electricity up to 20.4% can be achieved by using photo-voltaic modules. Furthermore, annual natural gas of up to 66.8% can be saved by using two unglazed solar collectors. Lastly, achieving “nearly zero energy” was possible for the presented case study area. The originality of this work lies in developing and applying an informed retrofitting (nearly-zero energy) guide to being used as a benchmark energy model for buildings that belong to an important historical era. The findings contribute to filling a gap in existing studies of integrating renewable energy sources to achieve “nearly-zero energy” in heritage buildings in hot climates. [less ▲]

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See detailParameters and indicators used in Indoor Environmental Quality (IEQ) studies: a review
Diaz Cisternas, Muriel Andrea ULiege; Piderit, Maria Beatriz; Attia, Shady ULiege

in Journal of Physics. Conference Series (2021), 2042

Indoor environmental quality (IEQ) is a broad concept, which seeks to define when a built space provides welfare to its occupants. In general, it is defined as the condition of thermal, visual, acoustic ... [more ▼]

Indoor environmental quality (IEQ) is a broad concept, which seeks to define when a built space provides welfare to its occupants. In general, it is defined as the condition of thermal, visual, acoustic and air quality comfort and depends on multiple factors. In the case of school buildings, the relevance of IEQ is related to its effects on the wellbeing, health and performance of the students and teachers. This research summarizes previous studies of IEQ from a multivariable perspective to prove that this research area needs to be further developed. Previous results show that an integrated analysis of IEQ parameters could better understand the IEQ perception of their occupants. Research on IEQ in schools generally refers to one or two aspects of the four. Even the most recent research deals with these topics separately, without using a systemic approach. The reductionism generated by isolating parameters allows us to study a parameter in detail but does not evaluate the environmental quality of the space. This is why new metrics are necessary to describe, assess and compare IEQ in educational spaces under a systemic approach. [less ▲]

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See detailThe Assessment of Outdoor Thermal Comfort inside Oasis Settlements in North Africa -Algeria
Matallah, Mohamed Elhadi; Djamel, Alkama; Mahar, Waqas Ahmed ULiege et al

in Scartezzini, Jean-Louis; Smith, Barbara (Eds.) Journal of Physics: Conference Series (2021, November 18)

Oasis settlements are the most common form in the Saharan regions of North Africa, identified by a strong harmony between urban forms and palm groves, which present the economic capital for these regions ... [more ▼]

Oasis settlements are the most common form in the Saharan regions of North Africa, identified by a strong harmony between urban forms and palm groves, which present the economic capital for these regions. On the other hand, these oases are significantly growing and impacting people’s livelihood and thermal well-being, especially during the summer season. This study aims at first to identify the close correlation between cultivated area (palm grove) and the built-up area throughout the Tolga Oasis Complex in Algeria, which is recognised by its palm groves and well-known as one of the largest oasis settlements of the Saharan regions in North Africa. Furthermore, the current work assesses the impact of palm groves by investigating the ‘oasis effect’ on the thermal heat stress levels during July and August daytime hours within 9 conducted stations. Surprisingly, the so-called oasis effect generated by palm groves was insignificant during the extremely hot days. On the other hand, the palm groves were extremely hot affected by a warming effect during daytime hours. [less ▲]

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See detailResilient cooling strategies- a critical review and qualitative assessment
Zhang, Chen; Kazanc, Ongun; Levinson, Ronnen et al

in Energy and Buildings (2021), 250

The global effects of climate change will increase the frequency and intensity of extreme events such as heatwaves and power outages, which have consequences for buildings and their cooling systems ... [more ▼]

The global effects of climate change will increase the frequency and intensity of extreme events such as heatwaves and power outages, which have consequences for buildings and their cooling systems. Buildings and their cooling systems should be designed and operated to be resilient under such events to protect occupants from potentially dangerous indoor thermal conditions. This study performed a critical review on the state-of-the-art of cooling strategies, with special attention to their performance under heatwaves and power outages. We proposed a definition of resilient cooling and described four criteria for resilience—absorptive capacity, adaptive capacity, restorative capacity, and recovery speed —and used them to qualitatively evaluate the resilience of each strategy. The literature review and qualitative analyses show that to attain resilient cooling, the four resilience criteria should be considered in the design phase of a building or during the planning of retrofits. The building and relevant cooling system characteristics should be considered simultaneously to withstand extreme events. A combination of strategies with different resilience capacities, such as a passive envelope strategy coupled with a low-energy space-cooling solution, may be needed to obtain resilient cooling. Finally, a further direction for a quantitative assessment approach has been pointed out. [less ▲]

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See detailHygrothermal Modeling of Green Roof Made with Substrate and Drainage Layers of Coarse Recycled Materials
Kazemi, Mostafa ULiege; Courard, Luc ULiege; Attia, Shady ULiege

in Proceeding of the International Building Simulation Conference (2021, September 03)

The thermal performance of an extensive green roof can be influenced by the initial hygrothermal conditions of substrate and drainage layers. Moreover, coarse recycled materials can affect the thermal ... [more ▼]

The thermal performance of an extensive green roof can be influenced by the initial hygrothermal conditions of substrate and drainage layers. Moreover, coarse recycled materials can affect the thermal resistance of green roof layers, while there is a demand for optimizing their thickness. Therefore, the main objective of this study is to optimize the thickness of green roof layers, once coarse recycled materials were used for substrate and drainage layers: WUFI software has been used for such application, which was suitable for modeling the initial hygrothermal conditions (heat and moisture properties) of green roof layers. According to the results, Rc-value for the green roof without coarse recycled materials was found slightly higher than that of the specimen with coarse recycled materials (4.1%), indicating nearly the same thermal resistance of the former and the latter. The green roof model with 15-cm substrate and 6-cm drainage layer can be regarded as the best appropriate system concerning their better thermal resistance and lower weight. [less ▲]

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See detailClimate Change Sensitive Overheating Assessment in Dwellings: A Case Study in Belgium
Rahif, Ramin ULiege; Fani, Abdulrahman; kosinski, Piotr et al

in Helsen, Lieve (Ed.) Proceeding of the International Building Simulation Conference (2021, September 01)

Due to the current rate of global warming, overheating in buildings is expected to be more frequent and intense in future climates. High indoor temperature affects occupant productivity, comfort, and ... [more ▼]

Due to the current rate of global warming, overheating in buildings is expected to be more frequent and intense in future climates. High indoor temperature affects occupant productivity, comfort, and health. Thus, it is necessary to predict the thermal performance of buildings concerning climate change. This paper applies a climate change sensitive overheating assessment method to a lightweight timber house in Eupen, Belgium. Three metrics are used, namely Indoor Overheating Degree (𝐼𝑂𝐷), Ambient Warmness Degree (𝐴𝑊𝐷), and Building Climate Vulnerability Factor (𝐵𝐶𝑉𝐹). The overheating risk is assessed under four climate scenarios representing historical and future scenarios using dynamic simulation tool EnergyPlus v9.0. This method accounts for overheating severity and frequency, considering zonal occupancy profiles and thermal comfort models. The results indicate BCVF<1 for the Passive House case study showing its high potential in suppressing the outdoor thermal stress in the long-term. Finally, the increase in ventilation rate proves to be an adequate measure by decreasing the zonal peak temperatures up to 10℃ and indoor overheating risk by ~60%. [less ▲]

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See detailPassive envelope design optimization of residential buildings using NSGA-II in different Algerian climatic zones
Semahi, Samir; Zemmouri, Noureddine; Hamdy, Mohamed ULiege et al

in Helsen, Lieve (Ed.) Proceeding of the International Building Simulation Conference (2021, September 01)

The most sustainable building operation is that presents a minimum primary energy consumption, which minimizes the environmental impact. Therefore, the objective of this paper is to optimize the passive ... [more ▼]

The most sustainable building operation is that presents a minimum primary energy consumption, which minimizes the environmental impact. Therefore, the objective of this paper is to optimize the passive envelope design of the multi-family apartment building in Algeria for reducing heating and cooling energy consumption. 12 representative cities are investigated and 20 design variables with their different combinations are simulated. A multi-objective non-dominated sorting genetic algorithm (NSGA-II) is coupled with EnergyPlus building energy simulation software to obtain the optimal solution according to the Pareto approach. Our optimization approach achieved energy saving ranging from around 21% to 51%. [less ▲]

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See detailComparison of overheating risk in nearly zero-energy dwelling based on three different overheating calculation methods
Attia, Shady ULiege; Rahif, Ramin ULiege; Fani, Abdulrahman et al

in Helsen, Lieve (Ed.) Proceeding of the International Building Simulation Conference (2021, September 01)

This study aims to inform building designers about overheating risks in nearly zero-energy dwelling and the importance of calculation methods. Three overheating risk indicators are selected and compared ... [more ▼]

This study aims to inform building designers about overheating risks in nearly zero-energy dwelling and the importance of calculation methods. Three overheating risk indicators are selected and compared, comprising 1) the EPBD overheating indicator, 2) the Passive House overheating indicator, and 3) the ambient warmness degree and indoor overheating degree indicators developed by Hamdy et al. (2017) (Hamdy et al., 2017a). The third overheating calculation method represents the latest state-of-the-art method for overheating assessment. With the help of the EnergyPlus energy modeling program, a calibrated building energy model was created. Annual simulations took place for a typical meteorological year comparing overheating risk according to three calculation approaches. Results confirm a 216% difference in the overheated hours between the Energy Performance of Buildings Directive (EPBD) method and the used method of Hamdy et al. 2017. Results emphasize the need to improve the Belgian EPBD calculation method and integrate long-term thermal discomfort indicators to represent climate change and overheating risks in dwellings. Key Innovations  Overheating risk estimation is calculated based on three different calculation methods, and results are compared  One of the overheating calculation method takes into account future climate change scenarios and applies long-term thermal comfort evaluation indicators  The findings urge the call for a new standardised wat to calculate overheating within the EU Energy Performance of Buildings Directive (EPBD) Practical Implications This paper provides a basis to integrate a new overheating calculation method in the EPBD tools in Belgium and other EU member states. [less ▲]

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See detailImpact of moisture content on the air permeability of the fibrous insulation materials
Kosinski, Piotr ULiege; Robert, Wójcik; Dariusz, Skoratko et al

in Rode, Carsten (Ed.) Proceedings of the 8th International Building Pysics Conference (2021, August 25)

Fibrous materials are characterized by good thermal properties, but are susceptible to air filtration. Effective air and wind protection of the building envelope eliminate the problem of air penetration ... [more ▼]

Fibrous materials are characterized by good thermal properties, but are susceptible to air filtration. Effective air and wind protection of the building envelope eliminate the problem of air penetration of fibrous materials, but there are still many buildings where this protection has not been applied. Authors investigated the effect of moisture on the air permeability of chosen loose fibrous materials: mineral wool, wood wool and cellulose fibers. The presented results may be used to the simulation of heat loses in existing buildings. [less ▲]

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See detailHeat and moisture transfer measurement protocols for building envelopes
Kazemi, Mostafa ULiege; Boukhelkhal, Islam; Kosinski, Piotr ULiege et al

Report (2021)

The temperature and humidity present in the building can cause energy consumption, degradation of building materials, and a feeling of discomfort for humans. Guidance is needed to control the flow of heat ... [more ▼]

The temperature and humidity present in the building can cause energy consumption, degradation of building materials, and a feeling of discomfort for humans. Guidance is needed to control the flow of heat and humidity and is proven to work in building envelopes. This report present an overview on the measurements of heat and moisture transfer in walls are carried out using a multitude of scientific and professional instruments as well as several methods according to international standards. [less ▲]

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See detailDeveloping two benchmark models for post-world war II residential buildings
Attia, Shady ULiege; Mustafa, Ahmed; Giry, Nicolas et al

in Energy and Buildings (2021), 244(111052),

In the context of the European carbon neutrality targets, building benchmarks are a key issue for the renovation of existing buildings. Although there are various benchmark methods for energy efficiency ... [more ▼]

In the context of the European carbon neutrality targets, building benchmarks are a key issue for the renovation of existing buildings. Although there are various benchmark methods for energy efficiency characterization, their application to the residential sector is still limited. This paper developed two building simulation models for post-world war II houses in Belgium based on data from post-occupancy measurements and field survey campaigns. The study reports the energy characteristics and occupancy profiled of detached single-family houses. An analysis of energy consumption (electricity and natural gas) and a walkthrough survey were conducted between 2016 and 2019. The benchmark model’s validity has been further checked against public statistics and verified through model calibration and monthly energy bill comparison. Two reference models representing 633.702 post-WWII single-family houses in Belgium were created and validated. The first archetype has an average energy use intensity of 166 kWh/m2 /year and represents detached single-family houses built between 1945 and 1969. The second archetype has an average energy use intensity of 155 kWh/m2 /year and represents detached single-family houses built between 1970 and 1990. The paper provides a timely opportunity to evaluate the real performance of post-world war II most common archetypes concerning design assumptions and how building professionals can turn the energy performance gap challenge to their advantage. The findings on energy needs and intensity are useful for creating future renovation scenarios for similar archetypes in Western European countries. [less ▲]

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See detailAnalysis of the impact of automatic shading control scenarios on occupant’s comfort and energy load
Tabadkani, Amir; Roetzel, Astrid; Xian Li, Hong et al

in Applied Energy (2021), 294

Building envelopes should be responsive to boundary conditions changing in short-time, daily, or seasonal patterns. To this end, adaptive facades provide the ability to react, or benefit from, outdoor ... [more ▼]

Building envelopes should be responsive to boundary conditions changing in short-time, daily, or seasonal patterns. To this end, adaptive facades provide the ability to react, or benefit from, outdoor fluctuations and dynamic indoor requirements. On the other hand, the parallel trend of developing new technologies to control their performance, make adaptive facades more applicable to counterbalance both user’s comfort and building energy load. This goal can be met using active control mechanisms, either manually or automatically. Automatic shading controls require indoor/outdoor signal inputs to operate a shading system. However, in the literature, there is no consent on the effectiveness of automatic shading control strategies and all of the studies were investigated within specific environmental conditions. Therefore, this paper aims to compare the most used control functions and their implications on user comfort and energy load in different climate zones. To this end, EnergyPlus was used as a simulation platform to employ Energy Management System (EMS) for linking sensors, actuators to the control logic of adaptive venetian blinds. Then, a brute-force method was performed through Ladybug-tools to conduct 15,390 iterations parametrically. Results showed that climatic conditions impact the shading control scenario significantly, and the optimum scenario was an open-loop algorithm based on direct solar radiation due to the earlier activation of blind closure to block solar radiation while increasing lighting load at the same time. [less ▲]

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See detailBenchmark model for nearly-zero-energy terraced dwellings
Attia, Shady ULiege

Textual, factual or bibliographical database (2021)

One building performance simulation benchmark model for nearly zero-energy dwellings in Brussels. The study reports an inventory and field survey conducted on a terraced house renovated after the year ... [more ▼]

One building performance simulation benchmark model for nearly zero-energy dwellings in Brussels. The study reports an inventory and field survey conducted on a terraced house renovated after the year 2010. An analysis of energy consumption (electricity and natural gas) and a walkthrough survey were conducted. A building performance simulation model is created in EnergyPlus to benchmark the average energy consumption and building characteristics. The estimate's validity has been further checked against the public statistics and verified through model calibration and utility bill comparison. The benchmark has an average energy use intensity of 29 kWh/m2/year and represents terraced single-family houses after renovation. (2021-07-06) [less ▲]

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