For a window with an overhang, this model outputs the fraction of the area that is exposed to the sun. The models can also be used for doors with an overhang.
The overhang can be asymmetrical (i.e. wR ≠ wL is allowed)
about the vertical centerline of the window. However, the
overhang must completely cover the window,
wL ≥ 0 and
wR ≥ 0.
wR must be measured from the respective corner
of the window.
The figure below shows the parameters.
The surface azimuth
azi is as defined in
The model assumes that
The implementation is explained in Buildings.HeatTransfer.Windows.BaseClasses.Overhang.
latbecause the latitude is now obtained from the weather data bus.
wRto be measured from the corner of the window instead of the centerline. This allows changing the window width without having to adjust the overhang parameters.