Overheating analysis of optimized nearly Zero-Energy dwelling during current and future heatwaves coincided with cooling system outage

Rahif, Ramin; Kazemi, Mohammad Taghi; Attia, Shady

doi:10.1016/j.enbuild.2023.112998

Cited by 17 publications

(7 citation statements)

References 98 publications

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“…However, there is growing evidence that in temperate climates, where both average summer temperatures and the frequency and intensity of heat waves are increasing, designing new buildings and retrofitting existing ones to be more energy efficient during the heating season is not enough [67,68]. On the basis of long-term weather forecasts, Rahif et al [14] use the example of terraced housing in the municipality of Woluwe-Saint-Lambert in Brussels to show that regions that are currently dominated by heating could become dominated by cooling in the next decades. Even in an optimistic scenario of IPCC 4.5 emissions in a heating-dominated region like Brussels by the end of the century, cooling degree-days will equal heating degree-days [14].…”

Section: Energy Policy For the Design Of Buildingmentioning

confidence: 99%

“…On the basis of long-term weather forecasts, Rahif et al [14] use the example of terraced housing in the municipality of Woluwe-Saint-Lambert in Brussels to show that regions that are currently dominated by heating could become dominated by cooling in the next decades. Even in an optimistic scenario of IPCC 4.5 emissions in a heating-dominated region like Brussels by the end of the century, cooling degree-days will equal heating degree-days [14]. The authors argue that the current approach of building design in these regions should be changed, as it could lead to an increase in overall energy consumption in the future, while at the same time increasing the risk of buildings overheating.…”

Section: Energy Policy For the Design Of Buildingmentioning

confidence: 99%

“…During the 2019 summer heat wave, more than 2500 deaths were reported across Europe [11]. The highest number of deaths was 1435 in France [12], 900 in the United Kingdom [13], 716 in Belgium [14], and 500 in Germany [15].…”

Section: Introduction 1the Impact Of Global Warming On External and I...mentioning

confidence: 99%

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Impact of Uninsulated Slab-on-Grade and Masonry Walls on Residential Building Overheating

Kuczyński,

Staszczuk

2023

Energies

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Studies of the effects of removing underfloor insulation and increasing the thermal capacity of building walls are currently found almost exclusively in existing vernacular architecture and rammed-earth buildings, mostly in countries with warm climates. This paper proposes the combined use of these two measures to reduce the risk of overheating in a detached single-family house in a temperate climate during the summer. Experimental studies conducted during the largest heat wave on record in the summer of 2019 showed that peak daytime temperatures decreased by 5.2 °C to 7.1 °C, and peak nighttime temperatures decreased by 4.7 °C to 6.8 °C. Simulation studies taking into account occupant heat showed that the proposed passive methods could, under the IPCC 8.5 scenario, eliminate the need for mechanical cooling in a detached single-family house in the temperate climate of Central and Eastern Europe by 2100. The actual heating energy consumption for the building with an uninsulated floor and increased wall heat capacity was 5.5 kWh/m2 higher than for the reference building, indicating that it can be a near-zero energy building. The proposed concept is in line with the new approach to the energy design of buildings, which should not be limited to reducing thermal energy demand, but should also respond to the needs arising from global warming.

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Section: Energy Policy For the Design Of Buildingmentioning

confidence: 99%

Section: Energy Policy For the Design Of Buildingmentioning

confidence: 99%

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Impact of Uninsulated Slab-on-Grade and Masonry Walls on Residential Building Overheating

Kuczyński,

Staszczuk

2023

Energies

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“…al. [6] investigated the optimal heating and cooling strategy for minimum total energy use and maximum thermal comfort in a nearly zero building (nZEB). However, the expected renovation wave in Europe [4] shows that the design question for renovation packages is as crucial as for nZEBs.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the impact of global warming on summer overheating risk in a residential building in urban areas in Belgium

Sharifi,

Shamsi,

et al. 2023

J. Phys.: Conf. Ser.

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Climate change has resulted in an increase of average outdoor temperature worldwide. With the rise of average outdoor temperature and unprecedented frequent heat waves, the demand for cooling systems in residential buildings has risen even in countries such as Belgium with moderate climates. However, there is a trade-off to consider when it comes to cooling. While active cooling methods can effectively maintain thermal comfort, they also come with excessive energy use in comparison to passive cooling techniques. However, passive cooling methods can lead to thermal discomfort and health issues during heat waves. To better understand this balancing act, this paper uses building energy simulation together with the measured current and accurately projected future climate data with high spatial resolution to investigate and quantify the potential for overheating in a selected residential representative building in the Flemish region of Belgium. Optimal solutions for renovation of the building are investigated including a variety of weather scenarios to account for climate change and to provide future-proof solutions. Results indicate that the renovation strategy is not affected by climate change for this case study. High insulation level with passive cooling strategy provided minimum energy use and acceptable summer overheating below 100 hours for this case study. Active cooling with medium and light renovation measures come with acceptable thermal comfort while also result in higher total energy use up to 53%.

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“…This observation gains even greater significance within the current landscape, characterized by a discernible shift towards the replacement of conventional systems with environmentally conscious alternatives. This collective effort seeks to amplify the pursuit of carbon neutrality, particularly within the realm of building design and infrastructure development [7][8][9][10][11][12]. In the context of this trend, the adoption of jet fan ventilation systems serves as a notable example of embracing innovative solutions to achieve heightened sustainability goals and mitigate global warming.…”

Section: Introductionmentioning

confidence: 99%

CFD Assessment of Car Park Ventilation System in Case of Fire Event

Rahif,

Attia

2023

Applied Sciences

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This scientific article presents the results of computational fluid dynamics (CFD) simulations conducted using OpenFOAM to evaluate the effectiveness of a jet fan ventilation system in managing the dispersion of smoke resulting from a car fire incident within an underground car park spanning a total area of 21,670 m2, situated in Tabriz, Iran. The primary objective of the study is to determine the velocity fields and evaluate visibility conditions within a 10 m radius to gauge the efficiency and effectiveness of the system. The study employs a smoke concentration production rate of 5.49 × 10−4 kg/m3s for simulations involving fire scenarios. A total of 17 fire scenarios are examined, each extending 30 m in all directions from the initial location. The research findings demonstrate that the placement of jet fan components plays a significant role in the system’s efficiency, with fans positioned near the ceiling leading to back-layering. To mitigate this issue, the recommended design solution involves the strategic installation of multiple jet fan arrays in specific zones with the addition of 10 extra jet fans, effectively curbing lateral smoke dispersion. Furthermore, the analysis of air flow rates shows that when jet fans direct an excessive airflow towards the exhaust shafts (which have a designated flow rate of 22.5 m3/s), recirculating flows occur, leading to the dispersion of smoke throughout the car park. Consequently, the utilization of low-velocity jet fans (11.2 m/s) proves to be more effective in clearing smoke compared to high-velocity jet fans (22.3 m/s). The study also emphasizes the importance of optimal positioning of supply and exhaust shafts to achieve effective smoke control, highlighting the need for placing them on opposite walls or minimizing airflow turns. Additionally, the research underscores the significance of fire resistance in jet fan units, as their failure during fire incidents can have severe consequences.

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Overheating analysis of optimized nearly Zero-Energy dwelling during current and future heatwaves coincided with cooling system outage

Cited by 17 publications

References 98 publications

Impact of Uninsulated Slab-on-Grade and Masonry Walls on Residential Building Overheating

Impact of Uninsulated Slab-on-Grade and Masonry Walls on Residential Building Overheating

Quantification of the impact of global warming on summer overheating risk in a residential building in urban areas in Belgium

CFD Assessment of Car Park Ventilation System in Case of Fire Event

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