Abstract
In a typical urban configuration, a microclimatic analysis has been carried out. Using a CFD method, a N-S oriented urban street canyon, with a given H/W ratio, has been examined. The standard k-ε turbulence model has been used to simulate a three-dimensional flow field and to calculate the thermo-fluid dynamics parameters that characterize the street canyon. In this study has been analyzed the thermal flow field when the walls of the building change the properties of solar radiation absorption, in particular for α=0.2 and α=0.8. Solar radiation considered is that of 21/07 in Milan in two different hours: at 11:00 a.m. and at 02:00 p.m. The study shows the importance of the thermophysical properties of a wall, in the development of the thermal field and flow field. This is a very important topic, in terms of improvement of wellbeing and the quality of the air within the cities, through the choice of materials and colors of the facades of buildings.
Highlights
Introduction25% of the final energy consumption, including all energy delivered to the final consumers (excluding deliveries for transformation and network losses) in the EU is used for residential and 15% for commercial buildings
25% of the final energy consumption, including all energy delivered to the final consumers in the EU is used for residential and 15% for commercial buildings
In this study, considering different ambient wind conditions, several simulations have been performed on an isolated urban canyon, in order evaluate the effects on the flow field and heat exchange processes within the canyon
Summary
25% of the final energy consumption, including all energy delivered to the final consumers (excluding deliveries for transformation and network losses) in the EU is used for residential and 15% for commercial buildings. There is a great energy saving potential by minimizing the energy demand for space heating and cooling of buildings. The increased heat gains are due to higher absorption of solar radiation on dark surfaces such as asphalt, the reduced energy losses during the night due to buildings that block thermal radiation to the cold sky, the lack of evapotranspiration as well as lower convective heat losses due to wind sheltering by buildings. Besides the higher air temperatures, higher radiative gains, to the building and lower convective heat losses from the building increase the space cooling
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