UTCI explained

The UTCI tab allows users to analyze outdoor thermal comfort for a combination of different meteorological conditions based on the presence or absence of sun and wind.

Clima leverages the several models implemented in Pythermalcomfort.

  • The "Solar gain on people" calculates the solar gain to the human body, so the mean radiant temperature. To simulate a sunless situation, Clima considers the person surrounded by surfaces that shade him, all of which tend toward dry bulb temperature;

  • Wind data is obtained directly from the weather file. The windless situation sets the value at 0.5 m/s, which is the minimum value allowed by the UTCI model.

The UTCI can then be visualized for the entire year for the scenario chosen.

The values are then converted into a scale assessing thermal stress, either because of cold or heat. Therefore, a second chart maps if people will experience thermal stress for all the hours of the year for corresponding UTCI temperatures.

The UTCI is a useful tool to design the outdoor space, to maximize the number of comfortable hours. The designer can influence two factors out of the four driving outdoor comfort: radiant temperature (i.e. exposure to the sun) and wind speed (i.e. exposure to the wind).

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