Hi Iason,
Your file runs fine and if you look at surface results you will see the solar gain through the window is there (attached!):
The confusion happens since solarGain output on zone results is actually “Zone Windows Total Transmitted Solar Radiation Energy” output in EnergyPlus. If you check EnergyPlus InputOutputReference you can see the definition below:
Zone Windows Total Transmitted Solar Radiation Energy [J]
The total Surface Window Transmitted Solar Radiation Rate of all the exterior windows in a zone.
Since your room has no exterior window the solar gain is 0. I think we should add this to output description.
Hope it helps,
Mostapha
Livingroomsunspace_msr.gh (651 KB)