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CBE Clima Tool
  • CBE Clima Tool
  • Documentation
    • Overview
    • Weather file repositories
    • Tabs Explained
      • Select Weather File
      • Climate Summary
        • Degree Days Explained
        • Climate Profiles Explained
        • Clima Dataframe
      • Temperature and Humidity
        • Temperatures explained
        • Relative humidity explained
      • Sun and Clouds
        • How to read a cartesian sun path diagram
        • How to read a spherical sun path diagram
        • Global and Diffuse Horizontal Solar Radiation
          • Global, Diffuse and Normal solar radiation explained
        • Cloud coverage
        • Customizable daily and hourly maps
      • Wind
        • How to read a Wind Rose
      • Psychrometric Chart
        • How to read a Psychrometric Chart
      • Natural Ventilation Potential
      • Outdoor Comfort
        • UTCI explained
      • Data Explorer
      • Charts Tips and tricks
  • Contributing
    • Run project locally
    • How to contribute
    • Code of Conducts
  • Version
    • Info
    • Changelog
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  1. Documentation
  2. Tabs Explained
  3. Outdoor Comfort

UTCI explained

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Last updated 2 years ago

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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 .

  • The "" 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).

Pythermalcomfort
Solar gain on people
Logos highlighting the different scenarios which can be displayed in Clima
UTCI perceived temperature annual heatmap in the four conditions for Rome, ITA
UTCI heat stress index heatmap in the four conditions for Rome, ITA