Vegetation in different street orientations of aspect ratio (H/W 1:1) to mitigate UHI and reduce buildings’ energy in arid climate

Aboelata, Amir

doi:10.1016/j.buildenv.2020.106712

Cited by 84 publications

(32 citation statements)

References 55 publications

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“…Based on the fundamental laws of fluid dynamics and thermodynamics, it can reproduce the outdoor microclimatic and physical situation of urban or rural spaces by accounting for the interaction of surface, plants, and air to evaluate the thermal conditions [51,52]. Several studies have shown that ENVI-met can simulate both spatial and temporal temperature and wind speed for the evaluation of microclimate in both simple and complex urban areas [20][21][22][23][24][25][26][27][28][29][30][31][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. A recent review by Tsoka et al [53] also provided evidence of its suitability for urban climate analysis and examined mitigation strategies.…”

Section: Simulated Area and Site Characteristicsmentioning

confidence: 99%

A Numerical Study on Mitigation Strategies of Urban Heat Islands in a Tropical Megacity: A Case Study in Kaohsiung City, Taiwan

Huang

Chen

2020

Sustainability

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In recent years, with the rapid increase in global warming and urbanization, urban heat island effects (UHI) have become an important environmental issue. Taiwan is no exception, with previous studies demonstrating serious UHIs in megacities. Although existing UHI research has utilized computer simulations to analyze improvement scenarios, there are few cooling strategy studies in actual blocks of Taiwan. Therefore, this study selected a block of a megacity in a tropical region of Taiwan as a case study by ENVI-met. Five improvement strategies were tested and compared to the current situation (B0): (1) Case C1 changed to permeable pavement, (2) Case C2 increased the green coverage ratio (GCR) of the street to 60%, (3) Case C3 changed to permeable pavement and increased the GCR in the street to 60%, (4) Case C4 changed to permeable pavement, increased the GCR in the street to 60%, and increased the GCR in the parks to 80%, and (5) Case C5 changed to permeable pavement, increased GCR in the street to 60% and parks to 80%, and set the GCR on the roof of public buildings to 100%. The results showed that the average temperature of the current thermal environment is 36.0 °C, with the comfort level described as very hot. Among the five improvement schemes, C5 had the greatest effect, cooling the area by an average of 2.00 °C. Further analysis of the relationship between the different GCRs of streets (SGCR) and the cooling effects revealed that for every 10% increase in the SGCR, the temperature of the pedestrian layer was reduced by 0.15 °C.

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Section: Simulated Area and Site Characteristicsmentioning

confidence: 99%

A Numerical Study on Mitigation Strategies of Urban Heat Islands in a Tropical Megacity: A Case Study in Kaohsiung City, Taiwan

Huang

Chen

2020

Sustainability

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“…Again, Fahmy et al (2019) modeled two hypothetical cases, in new Cairo and Heliopolis, to study the combined effect of street geometry and greenery. Aboelata and Sodoudi (2019), Aboelata (2020) and Aboelata and Sodoudi (2020) simulate the effects of tree lines strategy to ameliorate microclimate conditions in cases in Cairo, and the same thing was done by Elbardisy et al (2021) Recently, Fahmy et al (2020) reviewed all the case studies on the urban microclimate of Egypt. It is noteworthy that all these studies were: (1) conducted exclusively by architects.…”

Section: Introductionmentioning

confidence: 99%

Mitigation strategies of the urban heat island over Greater Cairo Metropolitan Area, Egypt utilizing ENVI-met model

Ibrahim

2021

Catrina: The International Journal of Environmental Sciences

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The formation of urban heat islands (UHI) over cities is the main challenge to the urban environmental sustainability worldwide. To mitigate UHI effects, passive cooling using cool materials and/or greening is thought to be the most effective strategy. As urban greening is relatively nascent in the urban literature, a multitude of research gaps are still to be filled, especially for the cities belonging to the hot arid belt. The present study aims to explore to what extent are three greening strategies (façade greening, roofs greening and urban parks) feasible in UHI mitigation using case study in Greater Cairo Metropolitan Area (GCMA). This task is best achieved through modeling, using the micro-scale numerical model ENVI-met, to simulate the probable outdoor cooling effects of greening for a hot summer day. The results, for this specific case, show that both façade and roof greening would yield up to 0.5 o C average reduction of air temperature compared with the actual case, while the cooling effects of the hypothetical pocket parks may be as high as 7 o C during day time till 15.00 PM, and after that parks would exhibit heat island properties. The study findings may assist in better planning of urban green spaces to increase their cooling potentialities.

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“…Recently, with the development of science and technology, numerical simulation has become an important means of outdoor thermal environment analysis, and the ENVI-met software has been one of the most widely used platforms [ 28 – 30 ]. ENVI-met is suitable for small- and medium-scale microclimate simulations; it has been used in relevant case studies of hot-summer-cold-winter regions [ 31 ], hot-summer-warm-winter regions [ 29 , 30 ], temperate regions [ 32 , 33 ], cold regions [ 34 ], hot and arid regions [ 35 , 36 ], and tropical regions [ 37 , 38 ]. Furthermore, it has been applied to many different outdoor microclimate spaces, such as streets [ 39 ], campus areas [ 40 ], parks [ 41 ], residential communities [ 42 ] and green-roofs [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal-comfort evaluation of and plan for public space of Maling Village, Henan, China

Fan

et al. 2021

PLoS ONE

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The thermal environment of village public space affects the comfort of people ’ s outdoor activities, and then affects the willingness of residents to outdoor activities, which has an important impact on the villagers’ quality of life. Previously published studies of thermal comfort mostly focused on the evaluation of thermal comfort index, few studies on the application of thermal comfort planning. The study was carried out in Maling Village, Changdai Town, Mengjin County, Luoyang City, Henan Province, China. Square, street, green space were chosen as three typical public spaces where thermal comfort indexes were measured by questionnaire survey and field measurement during summer. Subsequently, the village’s microclimate environment was simulated with ArcGIS 10.6 and ENVI-met. The results indicate that during the summer, the influences of temperature, solar radiation, wind speed, and relative humidity on the subjective comfort conditions of the outdoor environment gradually decreased. The spatial form of village has an important influence on thermal comfort. Finally, based on the results, this study put forward the thermal comfort process and planning scheme of the village outdoor space.

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Vegetation in different street orientations of aspect ratio (H/W 1:1) to mitigate UHI and reduce buildings’ energy in arid climate

Cited by 84 publications

References 55 publications

A Numerical Study on Mitigation Strategies of Urban Heat Islands in a Tropical Megacity: A Case Study in Kaohsiung City, Taiwan

A Numerical Study on Mitigation Strategies of Urban Heat Islands in a Tropical Megacity: A Case Study in Kaohsiung City, Taiwan

Mitigation strategies of the urban heat island over Greater Cairo Metropolitan Area, Egypt utilizing ENVI-met model

Thermal-comfort evaluation of and plan for public space of Maling Village, Henan, China

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