Microclima urbano: ventilazione naturale e ridefinizione dello spazio della città storica / Urban microclimate: natural ventilation and space redefinition of historic city. (rivista classe A)

The evaluation of the ‘climatically balanced’ structure of a city is extremely complex to define. The thermal mass is represented by the buildings themselves, envisaged as the walls of the urban room, with different porosity percentages related to the building density, where it is impossible to think in terms of isolated or isolable spaces. We then add a further degree of difficulty to the problem, not related the new but to the existing that has to be protected. In this context, from the data acquisition to the solution’s architectonical definition (fig. 1), the main focus is right on the analysis of the collected data and on its evaluation that has to be exact and synergic, necessary ground for a correct 'critical choice'. Only by working in synergy and not against the forces of nature, we will be able to take advantage of the potentialities (Olgyay 1981), while analysing the relationship between urban morphology and climate according to the various reading levels. These themes, which have never ceased to be current, are the basic preconditions in which my research develops, aimed at the microclimate evaluation of the historic fabric of Rome, with a specific attention to the study of air masses and their contribution to a microclimatic improvement for a possible redefinition of the urban space.