modelOverhang

For a window with an overhang, outputs the fraction of the window area exposed to the sun

Extends from Buildings.ThermalZones.Detailed.BaseClasses.Overhang, Buildings.HeatTransfer.Windows.BaseClasses.PartialShade_weatherBus.

Information

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, i.e., wL ≥ 0 and wR ≥ 0. wL and wR must be measured from the respective corner of the window.

The figure below shows the parameters.

image

The surface azimuth azi is as defined in Buildings.Types.Azimuth.

Limitations

The model assumes that

  • the overhang is at least as wide as the window, i.e., wL ≥ 0 and wR ≥ 0, and
  • the overhang is horizontal.

Implementation

The implementation is explained in Buildings.HeatTransfer.Windows.BaseClasses.Overhang.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.AngleaziSurface azimuth; azi= -90 degree East; azi= 0 South

Revisions

  • September 16, 2021, by Michael Wetter:
    Removed parameter lat because the latitude is now obtained from the weather data bus.
    This is for IBPSA, #1477.
  • July 5, 2012, by Michael Wetter:
    Changed definitions of wL and wR to 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.
  • February 25, 2012, by Michael Wetter:
    Revised implementation.
  • Feb 01, 2012, by Kaustubh Phalak
    First implementation.