Evaluating the effect of trees on UHI mitigation and reduction of energy usage in different built up areas in Cairo

Aboelata, Amir; Sodoudi, Sahar

doi:10.1016/j.buildenv.2019.106490

Cited by 88 publications

(45 citation statements)

References 37 publications

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“…In another study by the same authors [76], two case studies in Cairo were simulated using ENVI-met; Imbaba-65% urban density, and officers residences in the Elsalam district-23% urban density. A percent of 30% trees, 50% trees and 70% grass scenarios were applied to investigate their energy consumption implication.…”

Section: Uhi Mitigationmentioning

confidence: 99%

“…A further step using the same methodology is applied in the work of Ayad et al [111] to study the green and blue infrastructure effects on the energy efficiency in Alexandria in present and under climate change scenarios of the 5 th assessment report of IPCC [112] using the weather shift tool [113]. Eventually, Abolelata and Sodoudi [75,76] used the same methodology to mitigate UHI in Cairo using trees.…”

Section: Assessing Energy Efficiency Through Coupling Envi-met and Dementioning

confidence: 99%

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A Review and Insights for Eleven Years of Urban Microclimate Research Towards a New Egyptian ERA of Low Carbon, Comfortable and Energy-Efficient Housing Typologies

et al. 2020

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Since the mid-1970s, urban development in Egypt has sprawled far from the distinguished compact arid built environment, as the court-yarded housing typologies that completed the vernacular picture of desert architecture have been discarded in the early 20th century. This has motivated urban microclimate research in Egypt. The main objective was initially to improve outdoor thermal comfort. Therefore, Egyptian research started with assessing different existing patterns for the sake of climate responsive and sustainable urban design practice characterized with low carbon, thermal comfort and energy efficiency in such a hot arid conditions. That is why the review workflow of this article has followed a design progress workflow that led to solving design complexities with regard to generating housing urban forms on a microclimate basis rather than an article regular review workflow in order to extract the research gaps and conclude insights. After discussing a general framework for generating housing sustainable design identified from the concluded gaps, the main conclusion is a vision and a call to integrate the Urban microclimate-Building passiveness-Renewables design dimensions, UBR, towards the evolution of a new era of energy efficient housing typologies and a 5th generation of Egyptian sustainable cities where the 1st generation of new Egyptian cities started 1970s.

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Section: Uhi Mitigationmentioning

confidence: 99%

Section: Assessing Energy Efficiency Through Coupling Envi-met and Dementioning

confidence: 99%

A Review and Insights for Eleven Years of Urban Microclimate Research Towards a New Egyptian ERA of Low Carbon, Comfortable and Energy-Efficient Housing Typologies

et al. 2020

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“…Therefore, evaluating the cooling performances of different vegetation type combinations are necessary and interesting. Besides, most researches have only investigated the cooling performances of vegetation across horizontal scales [37][38][39][40]. Researches have seldom explored the cooling effects of vegetation on the vertical scale.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Evaluating the 3D cooling performances of different vegetation combinations in the urban area

Tan

Liao

Bedra

et al. 2021

Journal of Asian Architecture and Building Engineering

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Vegetation has been considered as an effective strategy to combat the urban heat island effect. Most researches have focused on evaluating the cooling effect of trees in the urban thermal environment. Little attention has been paid to the cooling effect of the combination of different vegetation elements. Moreover, most studies are focused on the horizontal cooling performance of plants, while fewer studies have investigated the vertical cooling effect of vegetation. Therefore, this study evaluates the 3D (horizontal and vertical) cooling performances of the three vegetation combination scenarios in the urban area using the ENVI-met model. The study indicates that the tree-grass (TG) combination has the best 3D cooling effect, followed by the tree-shrub-grass (TSG) combination, while the shrub-grass (SG) combination has the weakest 3D cooling effect. Among them, the 3D cooling effect of TG and TSG is significantly better than that of SG, while no big differences are noticed between the cooling effects of TG and TSG. Besides, it is economical to plant TSG combinations because fewer trees are needed than planting TG combinations. Therefore, the study recommends the tree-shrub-grass combination rather than TG or SG combination in urban areas to effectively improve the thermal environment. The study also shows that the relationship between increasing tree coverage and the resulting cooling effect is not linear. The results of this study can effectively guide the design of greening strategies in urban areas to improve thermal comfort.

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“…Negative correlations are observed in the pedestrian air temperature with trees and ground albedo; (2) the effects of cooling factors vary among different LCZ classes, with the increased 60% more trees leading to lower outdoor temperatures for LCZ-4 (0.28 • C), LCZ-5 (0.39 • C), and LCZ-6 (0.54 • C), while higher albedo of asphalt surface (increased by 0.4) is more effective in LCZ-4 (reaches to 0.68 • C) 14:00, compare to LCZ-5 (0.49 • C) and LCZ-6 (0.38 • C); (3) applying combined cooling methods can provoke air temperature reduction (up to 0.96 • C), especially when higher levels of tree quantities (increased by 60%) are coupled with cool ground materials (albedo increased by 0.4). The results can contribute useful information for improving thermal environment in existing residential regions and future residential planning.Sustainability 2020, 12, 2752 2 of 23 vegetation ratio [23], applying appropriate plant layout [24][25][26], and choosing the right vegetation species [27,28], the urban heat load can be alleviated efficiently. The cooling effect of green space is also closely related to tree canopy coverage and size [29].…”

mentioning

confidence: 99%

“…Sustainability 2020, 12, 2752 2 of 23 vegetation ratio [23], applying appropriate plant layout [24][25][26], and choosing the right vegetation species [27,28], the urban heat load can be alleviated efficiently. The cooling effect of green space is also closely related to tree canopy coverage and size [29].…”

mentioning

confidence: 99%

Numerical Simulation of Local Climate Zone Cooling Achieved through Modification of Trees, Albedo and Green Roofs—A Case Study of Changsha, China

Chen

Zheng

2020

Sustainability

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By exploring the cooling potential of tree quantity, ground albedo, green roofs and their combinations in local climate zone (LCZ)-4, LCZ-5, and LCZ-6, this study focuses on the optimum cooling level that can be achieved in open residential regions in Changsha. It designs and models 39 scenarios by integrating in situ measurement and ENVI-met numerical simulation and further compares cooling effects of various combinations of the cooling factors. The results show that (1) an increased number of trees and higher albedo are more effective compared to green roofs in reducing summer potential temperatures at street level (2 m high) in three LCZs. Negative correlations are observed in the pedestrian air temperature with trees and ground albedo; (2) the effects of cooling factors vary among different LCZ classes, with the increased 60% more trees leading to lower outdoor temperatures for LCZ-4 (0.28 °C), LCZ-5 (0.39 °C), and LCZ-6 (0.54 °C), while higher albedo of asphalt surface (increased by 0.4) is more effective in LCZ-4 (reaches to 0.68 °C) 14:00, compare to LCZ-5 (0.49 °C) and LCZ-6 (0.38 °C); (3) applying combined cooling methods can provoke air temperature reduction (up to 0.96 °C), especially when higher levels of tree quantities (increased by 60%) are coupled with cool ground materials (albedo increased by 0.4). The results can contribute useful information for improving thermal environment in existing residential regions and future residential planning.

show abstract

Evaluating the effect of trees on UHI mitigation and reduction of energy usage in different built up areas in Cairo

Cited by 88 publications

References 37 publications

A Review and Insights for Eleven Years of Urban Microclimate Research Towards a New Egyptian ERA of Low Carbon, Comfortable and Energy-Efficient Housing Typologies

A Review and Insights for Eleven Years of Urban Microclimate Research Towards a New Egyptian ERA of Low Carbon, Comfortable and Energy-Efficient Housing Typologies

Evaluating the 3D cooling performances of different vegetation combinations in the urban area

Numerical Simulation of Local Climate Zone Cooling Achieved through Modification of Trees, Albedo and Green Roofs—A Case Study of Changsha, China

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