Annex60.BoundaryConditions.SkyTemperature.BlackBody

# .Annex60.BoundaryConditions.SkyTemperature.BlackBody

Calculate black body sky temperature

## Information

This component computes the black-body sky temperature.

For `calTSky = 0`, the model uses horizontal infrared irradiation. Otherwise, it uses dry buld temperature, dew point temperature and opaque sky cover.

## Revisions

- January 6, 2016, by Moritz Lauster:
  Changed unit and comment of input `nOpa` for correct display of units in `weaBus` and input `radHorIR` to `HHorIR` for #376.
- May 5, 2015, by Filip Jorissen:
  Converted `algorithm` section into `equation` section for easier differentiability.
- August 11, 2012, by Wangda Zuo:
  Renamed `radHor` to `radHorIR`.
- October 3, 2011, by Michael Wetter:
  Used enumeration to set the sky temperature computation. Fixed error in `if-then` statement that led to a selection of the wrong branch to compute the sky temperature.
- March 16, 2011, by Michael Wetter:
  Added types for parameters and attributes for variables. Removed default parameter value.
- March 15, 2011, by Wangda Zuo:
  Use `smoothMin()` instead of `min()`.
- June 1, 2010, by Wangda Zuo:
  First implementation.

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