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University of Reading (1999)

Building cluster and shading in hot dry climate

Bourbia, M.F

Titre : Building cluster and shading in hot dry climate

Auteur : Bourbia, M.F

Université de soutenance : University of Reading

Grade : Doctor of Philosophy (PhD) 1999

It is well known that urban built form has an influence on the urban microclimate, which in turn will affect the environment performance of buildings. Size proportions and ratio of open spaces in relation to the built-up, have considerable effect on shading of both buildings and exterior spaces. The compact urban form, which is usually associated with the courtyard pattern, would minimize the exposure of both buildings and exterior spaces to sun and wind. This statement may be correct only under certain conditions and is subject to a number of specific requirements, i.e. the relative dimensions of open space and built volume, the treatment of exposed surfaces, and the orientation of the open space.In this thesis El-Oued (Algeria) has been chosen as a case study because its old city presents interesting useful features, especially when compared to the recently developed parts of the city. The traditional city appears to provide a relatively comfortable micro-climate to its inhabitants despite the extreme climatic conditions of this desert region. This research attempts to explore the validity of the above notions through field temperature measurements taken in the open spaces of traditional and contemporary sites and computer simulation, in order to evaluate and compare the climatic conditions in the two sites.A higher day time air temperature was recorded in the contemporary urban canyons compared to the traditional canyons and in some cases higher than the meteorological station recordings. The high air temperature recorded in the contemporary site was mainly caused by the exposed nature of the urban planning where horizontal (floor) and vertical surfaces (walls) are exposed most of the day to the intense solar radiation (lack of shading). The modelling simulation results shows a definite influence of the street orientations and their dimensions on the shading which affect the microclimatic condition of the streets

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