This is pretty easy with an EMS sensor (CosineIncident) on the output variable called “Surface Ext Solar Beam Cosine Of Incidence Angle” that is available for each window. Then some simple trig with the height of the window like this.
Set IncidentAngleRadians = @ArcCos CosineIncident,
Set SinIncident = @Sin IncidentAngleRadians,
Set TanIncident = SinIncident / CosineIncident,
Set PenetrationDepth = TanIncident * WindowCenterHeight,
I am working on a control algorithm designed to engage window blinds when a certain solar penetration depth is met using the Energy Management System in EnergyPlus.
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