BuildSysPro.IBPSA.BoundaryConditions.SolarGeometry.BaseClasses.WallSolarAzimuth

# .BuildSysPro.IBPSA.BoundaryConditions.SolarGeometry.BaseClasses.WallSolarAzimuth

Angle measured in a horizontal plane between the projection of the sun's rays and the normal to a vertical surface

## Information

This block computes the wall solar azimuth angle. It is the angle between the projection of the sun ray on a horizontal surface and the line perpendicular to the wall. The value of this angle varies from 0 to 180 degrees. In the northern hemisphere at solar noon, the value of the wall solar azimuth angle is zero if the wall is facing south.

## Revisions

- July 5, 2012, by Michael Wetter:
  Decreased `deltaX` from 1e-3 to 1e-4, as the looser tolerance gives sharp changes in IBPSA.HeatTransfer.Windows.BaseClasses.Examples.Overhang.
- February 23, 2012, by Michael Wetter:
  Guarded against division by zero because the altitude angle can be 90 degree in the tropics, and hence its cosine can take on zero.
- Feb 01, 2012, by Kaustubh Phalak
  First implementation.

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