Your assumption is correct.
However, because the EPlus does not define the window transmittance as a one way quantity, the condition is true only when the reflected beam component is negligible.
I come to this conclusion by studying the listed values for the exterior window. At low solar angle, the condition does not hold. At mid-day the beam is on the floor, therefore the beam component reflected out of the window is less, and your condition holds.
The change of the solar distribution to include the reflection did not produce any value for the interior window transmittance.
Date: Wed, 4 Aug 2010 18:38:13 +0000
Subject: [EnergyPlus_Support] solar transmitted through interior window
Is there anybody who can tell the exact answer to my question as follows?
If it is assumed that a zone has only one window, is this true to say that:
"solar transmitted through interior window" = "zone beam solar from interior windows" + "zone diff solar from interior windows"?
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