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Wind Speed

- [source code]
Calculate wind speed at a specific height above the ground for a given terrain type.
By default, the component will calculate wind speed at a height of 1 meter, which is suitable for most thermal comfort models like PET and SET. Alternatively, by hooking up the output wind data to the "LB Wind rose" component, a wind rose for any terrain or at height above the ground can be produced.
This component uses the same wind profile function as used by the "LB Wind Profile" component.

Inputs

  • met_wind_vel [Required]
A data collection of meteorological wind speed measured at the met_height with the _met_terrian [m/s]. Typically, this comes from the "LB Import EPW" component. This can also be a number for the meteorological wind speed in m/s.
  • height
The height above the ground to be evaluated in meters. (Default: 1 meter, which is suitable for most thermal comfort models like PET and SET.).
  • terrain
Text string that sets the terrain class associated with the output air_speed. This can also be an integer that codes for the terrain. (Default: city). Must be one the following. 0 = city - 50% of buildings above 21m over a distance of at least 2000m upwind. 1 = suburban - suburbs, wooded areas. 2 = country - open, with scattered objects generally less than 10m high. 3 = water - flat areas downwind of a large water body (max 500m inland).
  • met_height
A number for the height above the ground at which the meteorological wind speed is measured in meters. (Default: 10 meters, which is the standard used by most airports and EPW files).
  • met_terrain
Text string that sets the terrain class associated with the meteorological wind speed. This can also be an integer that codes for the terrain. (Default: country, which is typical of most airports where wind measurements are taken). Must be one the following. 0 = city - 50% of buildings above 21m over a distance of at least 2000m upwind. 1 = suburban - suburbs, wooded areas. 2 = country - open, with scattered objects generally less than 10m high. 3 = water - flat areas downwind of a large water body (max 500m inland).
  • log_law
A boolean to note whether the wind profile should use a logarithmic law to determine wind speeds instead of the default power law, which is used by EnergyPlus. (Default: False).

Outputs

  • report
Reports, errors, warnings, etc.
  • air_speed
A data collection or single value for the air speed at the input height above the ground for the input terrain. This can be plugged into thermal comfort models like PET or SET/PMV. Alternatively, by connecting the wind data to the "LB Wind rose" component, a wind rose for the input terrain and height above the ground can be produced.