How to specify radiation flux for surface?

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Dear all,

I am trying to change the outside boundary condition of building surface, namely control the solar radiation flux (W/m2). I looked into .edd file and found an actuator to change the outside air dry bulb temperature for specific surface, however could not find any similar actuator to change the solar radiation.

How to control the outside solar radiation flux for specific surface? If not possible, how can I achieve similar effect for a surface with or without fenestration?

Any advice would be highly appreciated! Thank you in advance!