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The *.AGD File

The climate files usually contain the solar radiation impinging onto a horizontal surface (exception: *.KLI files). If a hygrothermic simulation of a non-horizontal building component shall include the effect of solar radiation, the radiation component impinging on the surface must be determined for each time step, depending on the surface's orientation and inclination. This requires computing the sun's position in the sky for that time step, and therefore WUFI needs information on the geographical coordinates and the time zone of the location where the weather data were measured.

Depending on the climate file format, this information may not be present in the file itself and must then be supplied separately.
For the climate files delivered with WUFI, the information is either present in the files or it has been listed in the database. For climate files created by the user, it may be necessary to also create a corresponding *.AGD file ("additional geographic data").

Example (cf. example.agd in the Projects folder):

Additional Geographic Data
Showing data for Holzkirchen as an example
Longitude,Latitude  [°] (East,North is Positiv)
HeightAMSL          [m]
TimeZone            [hours from UTC]

The lines preceding the section marker [WUFI] will be ignored and may contain any comments. The section [WUFI] lists those data describing geographical longitude, geographical latitude, height above mean sea level and time zone that are missing in the climate file itself. These are in particular:

File format:LongitudeLatitudeHeightTimeZone

The "TimeZone" is indicated by the difference between the time zone of the measurement location and the Greenwich time zone (UTC) in hours (examples: Central European Time = 1; Eastern Standard Time = -5).

If the AGD file contains data that are already present in the climate file, but with different values, WUFI uses the values from the climate file.

The name of the AGD file must be the name of the corresponding climate file, with the extension .AGD added, e.g. Aberystwyth.TRY.AGD. WUFI expects the file in the same folder as the corresponding climate file.