Wind resource assessment

Furow has its own wind resource calculator, allowing the user to get all necessary maps to make a correct wind assessment of a given site.

All calculations can be performed at several heights depending on the needs of the user.

Clima object

Clima ObjectA Clima object shows a summary of the meteorology of the site to do all wind resource calculations useful for energy production calculation and micrositing. It is easy to create a Clima object by selecting under the Wind data object the appropriate channels of wind speed, wind direction, wind speed standard deviation, Monin-Obukhov length, pressure, humidity and temperature. 
The result is a number of tables which contain the following information by wind speed and direction:

  • Frequencies distribution of wind speed and direction.
  • Average values of wind speed standard deviation per wind speed and direction.
  • Standard deviation values of wind speed standard deviation per wind speed and direction.
  • Average atmospheric parameter.
  • Monin-Obukhov length median values.

Grid generator

Grid GeneratorOnce contours or raster grids of orography and roughness are input in the tree structure, a unified grid of the whole area or just part of it can be generated through a grid generator. Typical resolution is between 10m and 25m.

Physical maps

Physical MapsThere are some physical maps that are calculated as well for the calculations area: elevation map, meso-roughness map, slopes map, inflow angle, RIX map and DRIX map.

Wind map

The physical model used by Furow in wind speed calculations is based on the UPMORO code (based on Jackson-Huntt theory) first developed by the Research Group “Mecánica de Fluidos aplicada a la Ingenieria Industrial” belonging to the Universidad Politécnica de Madrid - Escuela Técnica Superior de Ingenieros Industriales (UPM-ETSII). During the development of Furow it has been optimized and improved from its original version. Results can be exported to WRG files.

Turbulence intensity map

Turbulence intensity mapTurbulence intensity model has been developed internally by Solute based on some conclusions derived from theoretical basis and wind tunnel testing. The idea is, as on the wind model, to separate the effects of orography and roughness to modify the values of wind standard deviation measured at the mast position and eventually calculate the turbulence intensity for each grid point.

Atmospheric maps

Atmospheric MapsNext parameters are calculated in Furow in order to get the atmospheric maps:

  • Pressure.
  • Temperature.
  • Air density.

Relative humidity from Clima object is also used.

Extreme wind maps

Having found Vref and other parameters related with extreme events, a wind map of extreme winds can be calculated thus yielding the Vref values for all turbine sites.

Discrete map (.RSF)

This option allows calculating the wind resource at specific turbine sites by selecting one wind farm. In this way, the user can save time when the wind farm layout is already optimized. 

Multiple mast wind resource assessment

With this option, and in case the project could have several met masts, the user can calculate the wind resource maps taking into account all the met masts, thus correcting the horizontal variations of the wind resource.

Relocate time series and Clima object

 Once all wind resource maps are created, Clima objects and time series of wind speed, wind direction, turbulence and atmospheric variables can be obtained at any point of the map.

Inspect profile

Wind profile and profile of other variables can be inspected for every sector, and can be shown in multiple ways (vertical profile, polar profile or in a table). Moreover, power law exponent is calculated to inspect areas with higher wind shear.