Heatstress and wind speed in New York

#Urban areas are characterized by a dense agglomeration of #buildings that, along with other parameters, define the urban microclimate. These buildings disrupt #wind flow patterns, which results in isolated “pockets” of stagnant, slow or non-moving air. This phenomenon can also be observed in the Physiological Equivalent Temperature (PET). The 2D graphic shows extreme PET values in a courtyard on the New Yorker East side.

With regards to the radiation, air temperature and humidity, no patterns can be found that coincide with the observations seen in the PET values. Further analysis leads to the conclusion that the high values in the PET are due to low wind speeds within the courtyard itself: The 3D graphic shows areas where wind speed values are lower than 0,15 m/s, indicating areas of stagnant, uncirculated air. The lack of proper ventilation leads to high thermal stress when residing in the example courtyard. With the environment being a complex system, it can be difficult to pinpoint the cause of a thermal comfort issue when experiencing it first-hand. With ENVI-met’s analytics, however, one can not only simulate, but also find causes for the made observations, which can lead to the implementation of adaption strategies to make the urban outdoors more livable. #heatstress