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[EnergyPlus_Support] Surface Incident Solar Radiation

Dear All,
I am trying to obtain the incident solar radiation for exterior surfaces such as the exterior walls (various directions) and roof.
I understand that there is an output named: Surface Ext Solar Incident under the Output:Variable.  I checked the EnergyPlus Main Documentation and it was listed as Zone,Average,Surface Ext Solar Incident [W/m2].
What does the Zone and Average mean?  Does "Average" means that the value given from the simulation is the average of the run period?
I specified the run period to be an entire year and taking the output for my roof, it was 190w/m2.
Does it mean that in order for me to determine the annual total solar incident energy, I will need to multiply 190 w/m2  by 8760 hrs to obtain a value of 1664 kWh/m2 per year?
Thanks in advance for any feedbacks and suggestions.
Best Regards,
Ng Poh Khai


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