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      A MODEL FOR PROGRAMMING DESIGN INTERVENTIONS AIMED AT REDUCING THERMAL DISCOMFORT IN URBAN OPEN SPACES: A Case Study on the Politecnico di Milano Campus

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          Abstract

          The environmental quality of urban spaces is strongly related to the thermal comfort perceived by people in open areas. At the micro-scale of neighbourhoods, the mitigation of the heat island effect can improve both the well-being of city-users in the public realm and the energy performance of buildings. A model intended for urban designers is presented, and it sets out to evaluate critical areas in the city context and define sustainable design solutions and concrete actions on the physical environment, in order to increase thermal comfort. In particular, variables used in the model are basically related to urban geometry, such as the accessibility of sunlight, sky view factors, aspect ratios of street canyons, and to the physical materials in the city, such as the albedo of horizontal and vertical surfaces and vegetation density. The technique is based on the use of algorithms defined in a Matlab environment and derived from image processing of Digital Elevation Models (DEMs) of the urban texture.

          The application was tested on the case study of the Politecnico di Milano’s main campus, located in the city of Milan. Especially in the case of limited resources, the results of the analysis suggest how public administrators and decision-makers could benefit from programming specific site interventions, based on the identification of critical weaknesses emerging at several points in the city. Moreover, the study focuses on the application of cool surfaces, the role of building layout (shape and size) and the effects of increasing the vegetation. Even in the absence of expensive thermal imagery from remote sensing, but simply referring to available cartography, this low-cost technique makes it possible to very quickly set up feasible environmental strategies over extensive urban areas. Furthermore, this tool proves to be useful for existing urban areas, as well as for simulating the impact of new design schemes.

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          Most cited references 10

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          “Mitigation of urban heat islands: materials, utility programs, updates”

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            “Graphical estimation of sky view-factors in urban environments”

             I Watson,  G JOHNSON (1987)
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              “Energy consumption and urban texture”

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                Author and article information

                Journal
                jgrb
                College Publishing
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Fall 2008
                : 3
                : 4
                : 119-129
                Author notes

                1BEST, Politecnico di Milano, Milano, Italy.

                2DIAP, Politecnico di Milano, Milano, Italy.

                3SENSEable City Laboratory, MIT, Cambridge, MA, USA.

                Article
                jgb.3.4.119
                10.3992/jgb.3.4.119
                ©2008 by College Publishing. All rights reserved.

                Volumes 1-7 of JOGB are open access and do not require permission for use, though proper citation should be given. To view the licenses, visit https://creativecommons.org/licenses/by-nc/4.0/

                Page count
                Pages: 11
                Product
                Categories
                RESEARCH ARTICLES

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