BuildingSystems.Climate.SolarRadiationTransformers.SolarRadiationTransformerIsotropicSky

# .BuildingSystems.Climate.SolarRadiationTransformers.SolarRadiationTransformerIsotropicSky

Solar radiation calculation on a tilted surface (isotropic sky model)

## Information

This model calculates the diffuse solar radiation on a tilted surface after the isotropic sky model of Liu-Jordan and the total incident radation on a tilted surface.

`IrrTotTil = IrrDirTil + 0.5 * (1.0 + cosAngleTil) * IrrDifHor + 0.5 * (1.0 - cosAngleTil) * rhoAmb * IrrTotHor`

where `IrrDirTil` stands for the total direct radiation on the tilted surface. cosAngleTil is the cosinus of the tilt angle, the angle formated by the tilted surface and the horizontal ground. `IrrDifHor` is the total diffuse radiation on a horizontal surface, `IrrTotHor` is the total radiation on the horizonal surface and `rhoAmb` is the reflexion factor of the surroundings.

#### References

Nikolai. V. Khartchenko. Thermische Solaranlagen Grundlagen, Planung und Auslegung, Springer ISBN 3-540-58300-9

## Revisions

- May 23, 2015 by Christoph Nytsch-Geusen:
  First implementation.

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