Differences between the reference wind at the reference station and the real wind in urban area

Differences between the reference wind at the reference station and the real wind in urban area

Wind assessment in urban places becomes necessary as soon as comfort, wind energy production, natural ventilation potential should be assess. From a “green building point of view”, the knowledge of the urban climatology i.e. the wind around the buildings is crucial in order to evaluate :

  • The air quality and thermal behavior inside the buildings as soon air and heat exchange depends on the wind pressure on façades.
  • The wind energy production from small wind turbines

Given that the air exchange depends linearly and the production of wind energy depends on the power three of the wind speed of the urban place where the architectural project will be built, CFD tools and energy models using the pressure and the wind magnitude have to consider the real urban climatology as inputs. Urbawind allows to understand the wind in urban areas The wind is commonly given at the reference meteorological station. That it is often found in the site exposed to winds such an airport where the land cover corresponding to a low roughness. When the designer wishes to know the wind site built, it must consider the relevance and representatively of wind data from the reference station.

CFD tools such as UrbaWind dedicated to calculate wind flow are useful to understand and interpret the wind in any urban areas. The wind distribution and the wind roses depends on the points considered. Such information useful to urban designer allows the treatment of pedestrian discomfort area by giving the adapted position to fit vegetal barriers and protect the pedestrian way.

 

    Author

    Stéphane Sanquer
    Product manager "Building and city planning" and natural ventilation expert at Meteodyn. PhD in Aerodynamics and thermics, I'm specialized in applied research in wind effects in urban area : pedestrian wind comfort, wind load on buildings and natural air ventilation.

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